Author: Thierry LEBOUCQ

Thierry LEBOUCQ is the chairman of GREENSPECTOR, which he founded in 2010. Author and speaker, he is extremely active and plays a pioneering role in the green information technology sector in France. He was a major contributor in France and in Europe to software ecodesign concerns. He has led several R & D projects on green software and several initiatives on green labeling for Web, mobile and IoT applications.

Greenspector, an actor of Planet Tech’Care

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What is Planet Tech’Care?

Planet Tech’Care is a platform that connects organizations and training actors who wish to mobilize to reduce the environmental footprint of digital technology with a network of partners, digital and environmental experts.

By adhering to this manifesto, signatories have free access to a support program made up of workshops designed by the initiative’s partners. The platform is run by the Digital Responsible for Syntec Numérique.

Why is Greenspector doubly committed to this national approach?

Greenspector, a member of Syntec Numérique and a company with a mission, is committed both as a signatory of the manifesto and is committed as a partner of this program to support the signatory organizations to take action, act for a sober digital and inclusive. Digital sobriety is a major factor in reducing our impact, but it is also a performance factor. The awareness of digital makers is key in the image that digital reflects today, this infinite world, without barriers and without limits in use. Many want to ignore this impact by looking more at the digital contributions to the reduction of environmental impacts but it must not become this industry which did not know how to react quickly enough as we reproach today to our models of movement, to our food. . Beyond awareness, the Planet Tech Care initiative is a way to mobilize the digital world to engage. The subject of the eco-design of digital services will be a way to reduce the consumption of energy and resources in the use phase but also to reduce the impact of equipment by using it better and by extending its lifespan. life.

A reminder of the key points of the manifesto:

1. Recognize that environmental change is a major issue for humanity on which digital players have an impact and must mobilize:

  • Commit publicly through the signing of the manifesto
  • Disseminate the initiative to their sphere of influence

2. Take action to contribute, at their level, to controlling environmental risks

  • Measure the environmental footprint (at minimum carbon) of their digital products and services
  • Identify and implement actions to reduce their environmental impacts
  • Identify and implement actions to extend the lifespan of digital products and services
  • Share this information and procedures with the stakeholders concerned

3. For those involved in education or offering training, set up training modules or courses to develop the skills of students and employees in responsible and environmentally efficient digital.

Auxylium: renewed trust for the continuation of the project

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The DGA and Atos renew their confidence in the GREENSPECTOR solution for 2020-2021 on the Auxylium project.


Auxylium is the smartphone project that equips the military in urban areas. It enables it to cope with surveillance and intervention missions, particularly in the context of major situations or events requiring the deployment of forces on the ground in France (SENTINELLE project). In this context, energy control with good usage performance for the best autonomy in the field is a key subject for the successful completion of the mission without weighing down the military’s equipment with additional batteries.

Greenspector will thus be involved in the continuous integration of the project, which will allow Atos teams to control the energy and resource consumption of the application.

Measurement and analysis actions in the previous phases of our collaboration made it possible to detect points of application over-consumption and made it possible to go from 3 hours to 11 hours of autonomy on the main uses.

Greenspector joins the Atos Accelerator program: #AtosScaler

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Greenspector joins the Atos Scaler

GREENSPECTOR joins the ATOS Scaler to pursue initial collaborations with the ATOS Group. The objective of this partnership is the integration of GREENSPECTOR solutions and expertise within ATOS projects to make the applications developed within the framework of the Group more efficient, inclusive and eco-responsible.

GREENSPECTOR is part of a global group of 14 start-ups when the Scaler Atos was launched on July 7, 2020. Greenspector will aim to participate in the “Decarbonization” of the Group’s activities. Recall that ATOS is the first ESN “Digital Services Company” on a global scale to integrate strong objectives of “0 Emission – Net” with the announced intermediate objective of halving their emissions within 10 years.

GREENSPECTOR has collaborated on several projects. We can cite in particular the military project AUXYLIUM (SENTINEL operation) a business application for which joint work with ATOS teams has made it possible to divide by more than 3 the energy consumption on board a smartphone.


This ATOS Scaler selection allows us to pursue a deeper stage in industrial and commercial terms of our partnership in France but also internationally. It responds to the challenges that the ATOS Group has set itself in terms of impact reduction of digital activities for their customers. We are therefore very proud to be able to make our contribution to this virtuous and necessary objective and to develop our international collaborations with a leading and committed ESN

This international partnership is part of a context where digital technology is consuming more and more with a global impact estimated at 4% of GHG emissions but which is growing faster than other sectors with the advent of increasingly frequent uses. and expensive, and increasingly new technologies.

The main figures of the carbon impact of e-commerce in France

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E-commerce sites are high traffic sites (11 million per month) and therefore have an impact reinforced by the volume of use and significant time of use (visit> 5 minutes). In addition, driven by strong growth in e-commerce, longer journey times and more and more mobility, oversized infrastructures to ensure a good level of response time, the e-commerce site makes an ideal candidate for a Carbon assessment of a digital service with environmental responsibility associated with mass services.


The assessment scope is based on the impact of the 100 most visited sites in France over the second half of 2019. It is therefore not exhaustive since the calculations do not take into account all the e-commerce sites with lower traffic.

How to assess the Carbon Impact of an e-commerce site?

To know the Carbon impact of an e-commerce web service, we worked on a simplified method based on real measurements.

On the Datacenter and Network side, we project the Carbon Impact from the consumption of data exchanged with the device (OneByte method of the ShiftProject).

On the User device, a real measurement on a mid-range Android smartphone equipped with a Chrome browser is launched 3 times and averaged before being projected with a Carbon impact factor taking into account the following assumptions: WiFi mix – GPS network, 50% brightness, phone battery wear at 500 full charge/discharge cycles.

The average impact of a course (= 1 visit)

The visit, on average of 5 minutes and 28 seconds on an e-commerce website in France on a smartphone device, has a carbon impact of 2 gCO2eq equivalent to 18 meters traveled by a light vehicle. Or 56 visits to an average e-commerce site impact 1 km driven with an average light vehicle.

The distribution of the sites is fairly homogeneous between 0.5 and 3 grams with some extreme values. Nevertheless, there are large differences: from 0.5 g to 34 g EqCO2, -> ie a ratio of X68 between the 100 Top E-Commerce sites in France. These differences can be qualified by taking into account that the visit time varies by a factor of 5 (from 3 to 15 minutes).

When we project the impacts on monthly visits, an e-commerce website has an average carbon impact of 23.8 Tons CO2eq/month.

The sum of the impacts of the top 100 e-commerce sites is 2380 Tons EqCO2/month, the equivalent of the impact of 21 million km of an average car in France or 531 rounds of the Earth by car or 19,636 average vehicles circulating in France corresponding to the fleet of an agglomeration of 40,000 inhabitants.

Projected over one year, it is 28.6 MegaTons Eq CO2!

Average impact of a page

In order to compare e-commerce sites with each other, the visit time or the number of steps or page views during the visit must be isolated. To do this, we go back to the basic measurement of a page for 1 minute.

A page from an e-commerce website in France has an average impact of 0.36 g CO2 eq.

In simple projection: 1,000 pages viewed for 1 minute on an average smartphone have an average carbon impact equivalent to 3.2 km from a light vehicle. The detailed ranking of the Top 100 e-commerce websites is available here. It will be likely to vary during future updates or request for re-measurement.

Breakdown of sites visited

Large difference: from 0.5 g to 34 g EqCO2, i.e. a ratio of X 68 between the 100 top e-commerce sites in France.

To explain this significant variation in impact, we can note that:

  • The data consumption ranges from 0.6 MB to 55 MB, or a ratio of X 92, this is the most discriminating factor explaining the differences in impact.
  • the energy consumption on the mobile device varies by a factor of 4.7

It is the network part that has the most impact with a share of 69% of the average impact of an e-commerce site on mobile.

If the mobile were replaced by a PC with a wired connection, the “User workstation” part would be much more important. This distribution of impact of course varies with the e-commerce site.

Low impact website case

Compliance with best practices on the network and low consumption on the device

Eco score Greenspector: 81/100, best Eco score of the Top 100 E-Commerce

Equivalent of 161,675 km of a light vehicle for 24.5 million visits / month (Source: Similarweb S2 2019)

Heavy impact website case

No respect for best practices on the network and high consumption on the device

Eco score Greenspector: 21/100, the lowest Eco score of the Top 100 E-Commerce

Equivalent to 44,582 km of a light vehicle for 2.1 million visits/month.

More impactful categories of sites than others?

A ratio of 1 to 3 on the impacts per page between categories

We have about 3 times more carbon impact by browsing a fashion e-commerce site than on an Automotive or Leisure site.

Rq: a single site classified in the Good Plans category

Projected earnings:

If all the sites were aligned with the most virtuous site in our measurements, we could save over a full year:

  • 15,177 tonnes of CO2eq, more than half of the impacts
  • Or 53% reduction in carbon impact
  • The equivalent of 4050 rounds of the earth by car

The major levers for improvement:

E-commerce websites can reduce network volume

  • Adapt content to device / type of connection & connection quality
  • Compression of rich content
  • User cache to avoid content already loaded on a previous visit
  • Limit the number of requests (internal, advertising, external services, etc.)
  • Beware of unsuitable pre-loads

E-commerce sites that can reduce their energy and battery consumption

  • Allow rapid interaction
  • Reduction in the consumption of scripts in the pages (3D animation, graphic animation, etc.)
  • Reduction of trackers / monitoring
  • External services to be evaluated / optimized
  • Reduced travel time
  • A design / graphics / color to optimize

Correlation analysis of carbon data

Correlation analysis between carbon impact and display performance

By taking 20 values from our sample for which we collected performance data, we can validate that there is no correlation between Carbon impacts and Display performance.

The 2 best performing sites are nevertheless also the least impactful sites

The Carbon indicator is an indicator in its own right for the management of an e-commerce website

Correlation analysis between Impact Carbone and Eco score Greenspector

The estimated Carbon indicator does not take into account other parameters, such as memory consumption, CPU, number of requests, or compliance with good practices, etc.
The Eco score includes both the consumption of resources/energy but also a note on compliance with good practices.

There is a “satisfactory” correlation between the estimated Carbon impact and the measured Ecoscore Greenspector.

Please note, the Carbon indicator does not cover all environmental indicators.

The carbon impact of the Top 100 E-Commerce websites

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Sales made on e-commerce sites are increasing each year, more and more on the go or from a smartphone at home. We have never consumed so much through these web platforms as we do today. A debate persists between the ecological impact of e-commerce in terms of logistics compared to a purchase made in-store. It all depends on certain parameters (delivery time, geographic location of the store, logistical means used, etc.). In addition to this logistical question, there is the environmental impact of digital technology for e-commerce purchases. How can we estimate the part that these online purchases represent in terms of the environmental impact of our life as consumers?

To answer this question on e-commerce in France, we took as a basis the ranking of the largest e-commerce sites in France (Top 100 E-Commerce: E-Commerce Nation & SimilarWeb study) and we add to your asks other sites. We measure the consumption of energy and resources on a mid-range smartphone which allows us to assess the carbon impacts on the entire chain: device (Greenspector methodology), network, and datacenter (OneByte method of the ShiftProject). This evaluation is done on the basis of the home page of the e-commerce site and on the basis of a 1-minute protocol. The Greenspector eco score completes the assessment of the site both by respecting good practices but also by measuring other metrics of resources not assessed in the Carbon impact.

Ranking of the carbon impact of the Top 100 E-commerce websites

PositionWebsiteTotal gEqCO2 per page/minuteEcoscore
Measurement date

Your e-commerce website is not in this ranking, contact-us to take a measurement and appear in this ranking!

Which video conferencing mobile application to reduce your impact?

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Article updated with new measures on StarLeaf, Rainbow and Circuit by Unify on May 19, 2020.
Article updated with new measures on Hangouts and Google Meet on May 4, 2020.
Article updated with new measures on Tixeo and Infomaniak Meet on April 23, 2020.
Article updated with new measures on JITSI and Teams on April 15, 2020.

The current “stay at home” context mechanically increases the use of online collaboration tools, in particular videoconferencing tools. This leads to a pressure on the network and more particularly to a significant load on the servers of each solution. It is therefore important from an efficiency point of view but also an environmental impact one to choose the simplest and most efficient solution.

For this study, we compare 14 videoconferencing applications: Whereby, Webex (by CISCO), Skype, Zoom, JITSI, Microsoft Teams, Tixeo, Infomaniak Meet, Hangouts, GoToMeeting, Google Meet, StarLeaf, Rainbow and Circuit by Unify.

For each of these applications, measured on an Samsung S7 smartphone (Android 8), the following three scenarios were carried out through our GREENSPECTOR Test Runner, allowing manual tests to be carried out over a period of 1 minute:

  • Audio conference only in one-to-one
  • One-to-one audio and video conference (camera activated on each side)
  • One-to-one audio conference and screen sharing

Each measurement is the average of 3 homogeneous measurements (with a small standard deviation). The consumption measured on the given smartphone according to a Wi-Fi type network can be different on a laptop PC with a wired network for example.

Measurement of energy consumption (mAh)

The StarLeaf application consumes the most of all three scenarios. This is due to the fact that the consumption in audio only mode, audio + screen sharing or audio + video is the same. This is a special case of our study. The GoToMeeting application is the least energy-consuming, closely followed by Hangouts, Zoom and Webex.

The energy consumption of all these applications is on average 2.1 times higher when adding video to audio and only slightly higher when adding screen sharing to audio (+14%). It’s not a surprise, avoid sharing with a camera to consume less energy on your devices during your video conferences and save your autonomy and the lifespan of your battery!

Measurement of data exchanged (MB)

GoToMeeting and Webex are the two applications that consume the least data. JITSI and Infomaniak Meet are the ones that consumes the most. Overall and without any surprise we note that the audio scenario is the one that consumes the least data. While the scenario activating both audio + video stream is the most consuming one.

The data consumption of all of these applications is 13 times higher when adding video to audio and almost doubled when adding screen sharing to audio (+77%). It’s not a surprise, avoid sharing video and limit your screen sharing to consume less data on networks in your video conferences!

It should be noted that these significant differences are mainly due to the significant audio-video consumption of the JITSI application with 35 MB transferred in 1 minute compared to 1.13 MB for GoToMeeting! JITSI‘s optimized mode does not reduce this data impact (33.4 MB / minute). Infomaniak Meet based on the JITSI engine meets the same volume anomaly on average and mainly on the audio + video part without improvement with the optimized mode.

Projection of the measured carbon impact data (gEqCO2)

A conference on mobile is 3 times more impactful for the environment when we add video to audio.

The carbon impact projection of all of these applications is on average 3 times greater when adding video to audio and higher when adding screen sharing to audio (+35%). It’s no surprise, avoid sharing video and limit your screen sharing to less impact infrastructure (network, datacenter) and on your devices in the context of video conferences!

Without any surprise, a large part of the carbon impacts are located on the network part (63%) but the impacts part on the device (28%) should not be overlooked!

The JITSI and Infomaniak Meet apps even averages 5.8 times more impact when adding video to audio and 40% more when adding screen sharing.

In the Skype vs Teams battle at Microsoft, the overall results are very close (6%). The Carbon impact is lower for Skype with a lower data impact but higher energy consumption on the mobile than Teams.

Which applications optimize energy and data consumption?

Only Whereby and Webex could be tested on optimization features for the mobile version.

The Whereby application with its “Mobile mode” setting which limits the resolution of the stream as well as other resource consumption optimizations. And Webex thanks to its configuration allowing to deactivate High-definition playback of videos only. Whereby saves 21% on energy consumption on the audio side, 15% on the audio and video side and 3% on the screen sharing side. These gains are nevertheless low considering the results obtained by the application that consumes the most audio and video mode from our panel.

On the Webex side, the gains are barely visible as limited only to the video part. It’s barely 5% gain in the Audio and Video scenario for the energy and carbon impact. The exchanged data is even slightly higher in audio and video mode.

The optimized JITSI application does not improve the data or energy impact. Power consumption is even higher in screen sharing mode in this optimized mode. However, there is a reduction in the data loaded in this optimized but minor mode (11% on average). Same findings for Infomaniak Meet.

The optimization of the TIXEO parameters makes it possible to considerably reduce the impact in audio + video mode and allows it to be classified as the 2nd least impacting application in the panel.

As for the Zoom application, a notification of battery overconsumption appeared several times during the measurements. Although we can optimize the video quality on PC, it does not seem possible to configure this on mobile. Without this optimization, the application becomes the most energy-consuming application in audio + video mode.


  • Promote audio only during your conferences: the video stream will tend to consume much more especially when sharing video via camera.
  • We recommend that publishers provide optimization options to the user and make them as accessible as possible even by default.
  • Prefer videoconferences over travel by car!
  • Comparison for 2 people who talk to each other for 3 hours in video + video (1 gEqCO2 on average per minute) when one of the two made 20 kms (112 g eqCO2 / km in France) round trip for a face-to-face face,
  • In videoconference: 180 * 1 * 2 = 360 gEqCO2.
  • By car: 112 * 20 = 2.4 kg EqCO2. Or 6.7 times more for the physical one-to-one.

Best 2019 Android apps and games ranking by GREENSPECTOR

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Google unveiled the best of 2019 Google Playstore in early December last year. Thanks to the GREENSPECTOR App Mark technology, we are revealing the ranking of these applications according to the App Mark, which assesses applications according to 5 criteria: performance, sobriety, discretion, inclusion and, of course, ecology.

Favorite 2019 applications ranking

At the top of this ranking we find the following three applications: Boosted, 21 Buttons and Omio. Only 1/3 of the applications are below the global ecoscore average. Among the 3 least sober applications of this ranking, 2 are strongly impacted by a zero score on at least one of the key indicators. In fact, the Plant Nanny application presents a score of zero on the ecological side (32 MB of data loaded during our evaluation), for the Curio application, it is the performance indicator which is zero, impacted by the time of application loading more than 23 seconds.

Focus on Boosted vs Music Zen

Here we compare the application with the best GREENSPECTOR App Mark (Bosted) versus the lowest ranked application in this ranking (Music Zen).

Even if the energy consumption is not the strong point of Boosted, MusicZen consumes 2 times more battery than Boosted on an identical route … what not to be “Zen” For its autonomy! Simple explanations: there are many trackers in this application which alters its performance and its sobriety. As a reminder, an added tracker also means an average of 8.5% more resource consumption.

Favorite 2019 games apps ranking

On the podium of the highest ranked game applications, we find: Assassin’s Creed Rebellion, Brawl Stars and Fishing Life. We observe that the last three game applications have a zero score for the ecology indicator. This is explained by two highly high technical criteria: the volume of data loaded as well as the CO2 impact. By the way, gaming applications are also more impactful on average than other applications.

Focus on Assassin’s Creed Rebellion vs Diner Dash Adventures

This time we are comparing the Assassin’s Creed Rebellion application versus Diner Dash Adventures.

To understand everything about these indicators, we invite you to read the following article 5 success keys for your application!

Energy consumption of the most popular e-commerce websites in France

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We measured the energy and resources consumption of the most popular e-commerce websites in France. Thanks to a recent study of SimilarWeb and ECN introducing a ranking of the Top 100 e-commerce websites, we selected the top 30 websites in this ranking and compared them according to their consumption of energy and mobile resources based on a simple functional path representative of their market activity.

Why measure energy consumption?

A website that consumes less energy will be more efficient because it will be “frugal”, with latency times shorter especially on a mobile phone that can sometimes be already crowded, older or low-tech. We can talk about a better “inclusion” business if the service responds in an acceptable way for users who do not always benefit from a favorable network conditions (degraded or saturated network) in their navigation.
The battery life will also be a curb for the user who does not wish to activate services too greedy for its autonomy, especially if it intends to use them very regularly. But surfing the web via mobile is it consumer on a smartphone? In our 2019 study of the Top 30 most popular mobile apps in the world, we had measured web browsing which is on average the most consuming category compared to video applications, video games or social networks. Tt’s enough to make buyers doubt and value their battery life.

In addition, a less energy-consuming website, and this is not the least argument, ultimately improves the website SEO

Indeed, the statistics of several tens of millions of visits in the month make it possible to imagine the extent of the impact throughout the chain of dissemination of the content and services of these websites. Even a slight improvement will benefit from a very important multiplier of reduction on the totality of the impact, whether on the user side or the server and network infrastructure. The digital actors must absolutely take into account this dimension of environmental responsibility in their business digital because as recalls the Shift Project, the digital climate impact will be equivalent in 2025 to that of light vehicles.

The 5 websites with the lowest energy consumption and the 5 most consuming ones

On the podium of the most energy-efficient websites, we find in first place the Rue Du Commerce website (10.6 mAh), LDLC (11.3 mAh) and ShowroomPrivé (12 mAh). Not far behind are the websites : Auchan (12.1 mAh) and Apple (12.4 mAh). The Rue Du Commerce website consumes 6.2% less than the second most energy-efficient one: LDLC and nearly 27% less than the average ranking (14.5 mAh).

On the side of the most energy-consuming websites, we find in last place the La Redoute website (18.1 mAh) followed by [Leroy Merlin] (https: // (17.6 mAh) and Airbnb (16.8 mAh). Finally, the websites Boulanger and Zalando (16.4 mAh) share the 26th and 27th place. The most energy-hungry website La Redoute consumes 24% more than the average of the ranking.


If we project the measured consumption on a Nexus 6 (voltage 3, 7 Volt), therefore only on the smartphone of the user, according to the average time of visit on a month: the flop 3 of the navigations the more consumers over the month are the sites: Leboncoin (99.34 MWh / month), Amazon (56.36 MWh / month), Ebay (19.34 MWh / month) . These 3 sites are at the same time penalized by a large number of visits, a rather long average visit time and a strong consumption of the purchase route.

The top 3 is made up of RueDuCommerce, LDLC and Auchan which are much less frequented but which also have the advantage of being in the best students on the market. consumption of the purchase route. If a site like Leboncoin was at the consumption level of the RueDuCommerce website, they could save their smartphone users more than 30 GWh/month, the equivalent of a country’s electricity consumption. like Haiti.

The projection of this Top 30 e-commerce websites, if all users had a Nexus 6 smartphone according to statistics visits indicated, would be about 3.7 TWh per year, the equivalent of the annual consumption of a country like Somalia. The server and network impacts were not taken into account in this study. It would be interesting to be able to estimate server side with the editors.

Energy consumption of 30 e-commerce websites

Only 12 websites are below the average (14.5 mAh) of this ranking. There is a 1.7 ratio between the least energy-consuming site (Rue Du Commerce) and the most energy-intensive (La Redoute).


The measurements were carried out by our laboratory on the basis of a standardized protocol: Nexus 6 Smartphone, Android 6, Wi-Fi, low brightness. 3 campaigns were conducted and the value used is the average of these 3 measurements. The measurement campaigns respect a specific user scenario adapted to each website (launch of Google Chrome, access to the URL of the website, search scenario, selection, basket and display basket)

Summary table of the 5 best sites and the 5 worst ones

WebsiteEnergy consumption (mAh)Exchanged data (Mo)Memory consumption (Mo)
La Redoute18.15390.9

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