01Compile-time only
The LLM never sees a passing run.
Run an LLM call once when you save a .flow.md. Commit the IR cache. From then on, runs are deterministic — same input, same output.
runtime: 0 LLM calls
LLM-native E2E for Expo & React Native
Anyone who writes tickets can write end-to-end tests.
Open-source, self-healing E2E testing for React Native & Expo.
Describe the scenario in plain prose; klera compiles it into a self-healing flow that runs on real devices. No API key, no it() blocks, no QA bottleneck.
flows/sign-in.flow.mdfixtures/test-account.yaml
›
Waiting for the agent to draft the flow…·Metro is watching. Save to compile.
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@morgan3m
Just shipped klera v0.4 — drift recovery in CI.
✓flow passed · 1.2s
01same prose · three redesigns
The same prose flow ran through three redesigns. Nobody touched the test.
One file, three months apart. The button got renamed twice and moved once; the prose stayed the same. The matcher walks a strategy ladder and recovers across drift it can resolve.
flows/sign-in.flow.md
Enter the test fixtures, tap sign-in, then assert the home feed loads.→running on “Sign In”
fixtures/test-account.yaml
email: test@klera.dev
password: hunter2-passWelcome back
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Pick up where you left off.
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Hi again.
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02about that LLM dependency
The LLM compiles your prose. It never runs your tests.
The planner is a build-time compiler. The runtime is a deterministic IR walker. Unplug the model and your existing flows still pass.
02Your code stays local
Source code never leaves your machine.
The planner sees the prose flow and the element-graph snapshot — nothing else. Secrets are scrubbed from every wire-bound payload before it leaves the process.
snapshot only · zero source access
03Swap any planner
Four interchangeable transports. Free under your existing CLI.
Anthropic API, your local Claude / Codex / Gemini CLI, an MCP server, or paste-into-any-chat. All produce identical IR. Edit one config line to switch. No vendor lock-in.
apivia-clivia-mcpmanual
03analytics on every failure
Every failure ships with a full forensic record.
A verdict, a suspect commit, frames, and a written narrative. Open the report and you know whether to revert, update the flow, or rerun.
failureflows/checkout-android.flow.mdstep 4 of 6 · failed at 00:12.4 · 2026-04-29
last frame · captured
verdict
regressiondriftflakedata
The runtime tapped “Place order”, but the next screen never mounted. The element graph shows the button transitioning to disabled — no navigation event followed.
suspect commit
a1c4f29checkout: gate submit on payment-method validity
proposed fix · pick a payment method before tapping
- Tap “Place order” and confirm the order receipt appears.
+ Pick a saved card, tap “Place order”, and confirm the order receipt appears.07 / parity
framework comparison
Where every framework agrees, and where they don't.
| Capability | klera | Detox | Maestro | Appium |
|---|---|---|---|---|
| Prose-first authoring (no API key) | ✓ | ⛔ | ⛔ | ⛔ |
| Save-on-compile dev loop (Metro plugin) | ✓ | ⛔ | ⛔ | ⛔ |
| Coding-agent integration (AGENTS.md) | ✓ | ⛔ | ⛔ | ⛔ |
| Self-healing under UI drift | ✓ | ⛔ | ⛔ | ⛔ |
| Auto-triage on failure | ✓ | ⛔ | ⛔ | ⛔ |
| Visual flow-diff in PRs | ✓ | ⛔ | ⛔ | ⛔ |
| Reads existing Maestro YAML flows | ✓ | ⛔ | ✓ | ⛔ |
| Visual regression diff | ✓ | ◐ | ✓ | ◐ |
| Network mocking + assertions | ✓ | ◐ | ⛔ | ◐ |
| tap (by testID / label / text) | ✓ | ✓ | ✓ | ✓ |
| type text into input | ✓ | ✓ | ✓ | ✓ |
| swipe (direction or coordinate) | ✓ | ✓ | ✓ | ✓ |
| Hardware back (Android only) | ✓ | ✓ | ✓ | ✓ |
| Permission grant (Android runtime) | ✓ | ✓ | ✓ | ✓ |
✓ supported◐ partial⛔ not supported
See the full compatibility matrix →04 / install
Try it on a flow tonight.
One command and a flows/ directory. Works against bare Expo and managed RN projects. Free, MIT licensed, no account.
$ npx @klera/cli init
klera init scaffolds the prose flow, the IR cache, the Metro plugin, and the AGENTS.md brief. After it finishes, save a prose change and watch the flow run.