Project
Benchmarks
Every number on this page comes from building real features on the public
test app (Expo Dev Client) with /rn-feature-dev — 35 completed features
across form wizards, charts, lists, notifications, and animations. No
synthetic micro-benchmarks.
Description → verified feature
Section titled “Description → verified feature”The end-to-end measurement that matters: from a one-line feature description to code that has been implemented and verified live on the simulator — component tree, store state, and interactions checked.
| Feature complexity | Examples | Time to verified |
|---|---|---|
| Simple | search field, toggle, store slice | 3–5 min |
| Medium | forms, charts, lists | 5–10 min |
| Complex | 3-step wizard, onboarding flow | 11–25 min |
Zero crashes and zero manual interventions across all 35 measured builds — no human unblocking, no restarts.
Where the time goes
Section titled “Where the time goes”| Pipeline phase | Typical share |
|---|---|
| Discovery, exploration, questions | ~3 min |
| Architecture | ~1 min |
| Implementation | ~5 min |
| Live on-device verification | ~5 min |
| Code review + fixes | ~4 min |
| Summary + E2E proof | ~2 min |
Replay economics
Section titled “Replay economics”Flows the agent has verified once are saved as actions and replayed instead of rediscovered:
| Interactive walk | Replayed action | |
|---|---|---|
| 3-step wizard flow | ~14 min | ~4 s |
That is a ~210× speedup on every later session that needs the same flow (login, navigation, multi-step setup). Across the measured features, average session time dropped from ~12 min to ~4 min once the corresponding actions existed.
Device interaction latency
Section titled “Device interaction latency”iOS interaction goes through an in-tree XCTest HTTP runner:
| Operation | Latency |
|---|---|
| Tap | ~216 ms |
| Accessibility-tree snapshot | ~5 ms |
| Screenshot | ~74 ms |
| Per-step overhead | ~1.4 s (vs ~3.1 s CLI baseline) |
The ~210 ms tap floor is XCTest’s own event-synthesis limit.
Libraries verified end-to-end
Section titled “Libraries verified end-to-end”Features using these libraries were built and verified through the full pipeline: react-hook-form, zod, @tanstack/react-query, @gorhom/bottom-sheet, @shopify/flash-list, zustand, react-native-svg, expo-notifications, react-native-reanimated, react-native-gesture-handler, expo-haptics.
Methodology
Section titled “Methodology”Timings are wall-clock, recorded on an Apple-silicon MacBook Pro with a booted iOS simulator and Metro running, using the repository’s public test app. Complexity buckets reflect the feature’s UI and state surface, not lines of code. Latency numbers are medians over repeated runs.