Performance
RAM, renders, launch time and frame pacing from the production build. Each step of the flow gets its own memory delta, so a leak points at the screen that caused it.
Early access · opening in batches
Measure the build
Measure the build
your users get.
weftrun runs your release build on real devices, repeats every flow, photographs every screen and checks every journey. A change is flagged only when it clears the noise it was measured against.
- Works with
- React Native
- Expo
- iOS
- Android
- Maestro
Set up in three steps.
Then just ship.
No SDK and no source changes. The CLI builds your release app, measures it and puts everything back.
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$ weftrun login✓ Signed in to Lumen Labs$ weftrun apps add lumen✓ app.lumen.ios · rn-maestro
1Connect your app
Sign in from the terminal and register the app. Your flows live with the team, so every machine runs the same steps.
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$ weftrun run checkout --repeat 5build once · install once · measure 5×✓ 5 cold starts · RAM median 209.8 MB ±3.5
2Run the release build
Each repeat is a fresh cold start of the optimized build. The spread across repeats becomes that metric's noise floor.
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RAM (avg) · 1.6.1 → 1.6.2209.8MB▼ 7.6% · clears 2σ
3Read the verdict
The dashboard compares the new version with the last one. Numbers turn red or green only when the move is bigger than the noise.
One place for the whole
release review.
Speed, screens and journeys, measured against the same build and compared with the version before it.
Screens
Every route photographed in light and dark. Changed screens come first, and a navigation that silently failed is flagged instead of shipped as a stale picture.
End-to-end
Your Maestro flows, sharded across devices. A failure comes with the step, the assertion and the device it happened on.
Runners
Enroll the Macs you already have. weftrun checks Xcode, simulators, Maestro and disk before it hands them a job, and tells you what to fix.
Color only when signal beats noise.
Most tools flag anything over a flat 5%, which cries wolf on a noisy metric and misses a real leak on a quiet one. weftrun colors a delta only when it clears twice the standard deviation it measured. Drag the candidate below and watch where red begins.
Render count · baseline 1,847
noise floor ±196 (2σ)
+0.0%
within noise
below 2σ stays gray
above 2σ is a regression
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No source changes
Instrumented at build time and reverted when the run ends. Your repo stays clean.
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Cold start, every time
The app is terminated between repeats, so caches from the last run never flatter the next one.
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Memory per screen
Retained memory is measured per step, so the number holds whether the run lasted 30 seconds or two minutes.
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Refuses unfair diffs
Different device, OS or simulator? weftrun says the runs aren't comparable instead of guessing.
Simple pricing.
Free while you try it on one app. Team when the whole release depends on it.
Free
$0
For one app and a few runs a month.
- 1 app
- 5 runs a month
- Public dashboard
Team
Most teams$29a month
For teams that gate every release on it.
- Unlimited runs
- Private CI gating
- Fingerprint-matched baselines
- Priority support
Questions
What does weftrun measure?
Memory, render counts, launch timings, JS heap and frame pacing for each flow you define, plus a photo of every screen and the result of every end-to-end journey.
Do I have to change my app's code?
No. weftrun instruments the release build when it is built and reverts every change when the run ends. There is no SDK to add.
Why repeat each flow?
A single run can't tell a real change from a noisy one. Repeating gives every metric its own spread, and a delta is only colored when it clears twice that spread.
Which apps does it support?
React Native apps on iOS and Android today, Expo included. End-to-end flows use Maestro.
Where do the runs happen?
On Macs you enroll as runners, or on your own machine through the CLI. Results, screenshots and logs upload to your team's dashboard.
When can I start?
Access opens in batches. Join the waitlist and we'll email you when your seat is ready.
Measure the next change.
Join the waitlist and we'll email you the moment your seat is ready.
Free while in beta · one email when your seat opens