Semaloop vs Maestro
Maestro is a YAML-driven mobile UI testing framework built for readable, declarative flows. Semaloop runs natural language tests on real iPhones and Android emulators against every build you ship.
What Maestro is
Maestro describes mobile UI tests as YAML flows — tap this, assert that is visible — with built-in tolerance for flakiness and a fast local feedback loop. It is markedly simpler to live with than Appium while remaining a written, element-addressed suite.
Where they differ
| Semaloop | Maestro | |
|---|---|---|
| How a test is written | Natural language describing the outcome | YAML steps naming the elements to act on |
| Who decides the steps | The agent, fresh on each run | The author, fixed at write time |
| When the UI changes | The description usually still holds | The flow is edited where elements moved |
| Running on every build | Automatic from TestFlight, or an APK pushed from CI | You wire it into CI yourself |
| Non-visual checks | Audio and on-screen state are both in scope | UI assertions |
Choose Maestro if
- You want tests versioned in your repo, reviewed in pull requests, and runnable offline on a laptop.
- Your flows are stable and short, and YAML is a fair description of them.
- You want an open-source tool with no per-execution cost.
Choose Semaloop if
- Your flows are long or stateful enough that enumerating each step is the expensive part.
- You want a run per build without maintaining the CI wiring for it.
- You need checks that go beyond what is on screen, such as what the app is playing.