The Greenspector Test Bench
Real smartphones and tablets, fitted with measurement probes, under the same conditions as your users. No emulation, no estimates: measurement.
The problem to solve
Market device labs give you access to thousands of devices to check that your app works. But those devices stay plugged in, connected via USB, in an uncontrolled energy state. You cannot measure what your app actually consumes in your users' pockets.
The Greenspector Test Bench was designed to answer a different question: how much energy, data and resources does your app consume — and how can you optimise it?
The 4 pillars
Every device on the bench is fitted with high-precision measurement probes that capture the energy actually consumed, at high sampling frequency.
The result: reliable, comparable and defensible energy data — including on iPhone, a world first.
A measurement is only useful if it is reproducible. Each device is monitored and stabilised continuously: brightness, background apps, charge level, system services. Compare two versions, journeys or competitors under strictly identical conditions, with known and displayed measurement uncertainty.
Your users do not use their phone tethered to USB in a data centre. On the Test Bench, devices run in real user mode: on battery without external power during measurement, no active USB connection, on Wi-Fi or cellular according to your test strategy.
Testing only on the latest flagship ignores most of your users. The fleet covers 3 tiers (entry, mid, high end), several device generations, Android and iOS, phones and tablets. Validate that your service stays performant and frugal for everyone — including older devices, a key lever against obsolescence.
Comparison
| Classic device farm | Greenspector Test Bench | |
|---|---|---|
| Goal | Functional and compatibility testing | Functional testing + energy, performance and environmental impact measurement |
| Energy measurement | Software estimate (at best) | Real measurement via high-precision probes |
| Power during test | Device plugged in via USB | Device on battery, in real conditions |
| Environment stability | Reset between tests | Continuous stabilisation and monitoring of measurement conditions |
| Device fleet | Maximum number of models | Representative fleet: 3 tiers × several generations, Android/iOS, phone/tablet |
| Sovereignty | Devices hosted in the US or Europe on non-sovereign stacks (AWS, Google/Firebase…) | Sovereign infrastructure, hosted and operated in France by Greenspector |
FAQ
OS counters estimate consumption from internal models that vary by manufacturer and version. Our probes measure the energy actually consumed by the device. That is the difference between an estimate and a measurement.
A USB-powered device does not behave like one on battery: power management, CPU frequencies and network behaviour differ. Measuring on battery is the only way to reflect your users' real experience.
Yes. Greenspector operates the world's first energy measurement bench on real iOS devices.
Through continuous device stabilisation, repeated measurements and systematic display of uncertainties. Our methodology is public and documented.
Yes — contact us to discuss deployment options.
Yes. Greenspector Studio provides APIs to trigger measurements on every build or release and to manage energy and resource budgets.
Move to real measurement
Discover the real energy behaviour of your application on the Greenspector Test Bench.