Launch HN: Momentic (YC W24) – Agents that catch bugs by using your app

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Launch HN: Momentic (YC W24) – Agents that catch bugs by using your app

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Mo is an AI QA engineer that tests your app end to end. Verify crucial flows and discover bugs from a prompt.

Tests created 77,813

Test runs executed 70,607,819

Changes verified 339,166

PRs verified 80,290

Auto-heals 8,932,104

Bugs caught 117,010

Tests created 77,813

Test runs executed 70,607,819

Changes verified 339,166

PRs verified 80,290

Auto-heals 8,932,104

Bugs caught 117,010

Tests created 77,813

Test runs executed 70,607,819

Changes verified 339,166

PRs verified 80,290

Auto-heals 8,932,104

Bugs caught 117,010

 a bug-bash copy on the remaining and the submitted finding alongside its record on the right

Trusted in manufacturing by teams shipping all day.

"Our team's cognition alongside Momentic has been great. Setting up tests is uncomplicated and the developer cognition has been fantastic."

Erdem

Head of Developer Experience, Notion

"Having E2E QA be part of the betterment process, run this accelerated (6.3x parallel), and at this measure (for all sole drag request) is a true dream. Seriously, a green CI now has a measurable effect on my sleep quality."

Glavin

Founding AI Engineer, Coframe

"Momentic makes it 3x faster for our squad to compose and keep end-to-end tests. Startups win by shipping faster and better, and Momentic enabled us to do exactly that."

"I fair ran our archetypal automated eval throughout 110 prompts. This would have taken fine complete an hr manually — I kicked it off in 5 seconds and it was done in 14 minutes. HUGE for us."

Mike

Engineering Manager, Runway

"I affection operating alongside Momentic. Especially following having years of former cognition in QA, it feels akin riding a bike, apart from the bicycle is a supercharged electric one!"

Anna

Senior Productivity Engineer, Webflow

Code moves faster. Verification has to keep up.

Coding agents have made it dramatically faster to build software. The bottleneck is now knowing it works. Verification belongs in the agent loop. Agents need evidence from the app itself to verify that their changes deliver the intended behavior.

Explore

The agentic norm platform.

Write the person flows you need to verify. Momentic runs the tests against your app. Reuse prosperous AI actions and assessment projected repairs as the app changes.

1 of 5

01

Knows how your merchandise plant

Add terminology, expected behavior, and test direction to the Knowledge base. AI-assisted steps appearance up applicable entries as they run.

PRODUCT CONTEXT AT EACH AI STEP

02

Keep tests operating as the UI changes

Momentic finds controls again whenever the UI changes during a run. Permanent care proposes a test-file repair for you to review.

RUNTIME RECOVERY AND REVIEWED REPAIRS

03

Verify changes alongside your coding delegate

Give your coding delegate the changed flow. It can use MCP to author a test, inspect it in a live session, and preserve the YAML alongside your code.

TESTS REVIEWED WITH THE CODE

04

See why a test unsuccessful

Inspect the failing step, screenshots, and traces. Classify failures as use bugs, test flakiness, or surroundings issues.

STEP-LEVEL FAILURE EVIDENCE

05

Verify before you merge or deploy

Run the CLI in your CI job. Use its exit code as a required inspect before merging or deploying.

CLI EXIT CODES FOR CI CHECKS

Verification from your publishing company to CI.

Define what matters. Let Momentic verify it.

Write steps and assertions in plain-English YAML.
Review and type the tests in your repository.

01 / author

Write tests in plain English

Describe a person stream and its expected outcome in plain English. Keep the steps and assertions in YAML records your squad and coding delegate can review.

02 / run

Run locally and in CI

Use the CLI to inspect the app you're changing. Run the identical tests in CI before the next merge or deploy.

03 / triage

Find the root cause

See which stage unsuccessful and inspect its screenshots and traces. AI triage investigates the logic and proposes a test repair for you to review.

04 / heal

Auto-heal as your merchandise evolves

Momentic finds controls again whenever the UI changes. Permanent care proposes test-file edits for review. Apply the diff and rerun to inspect the result.

Learns how your merchandise works.

Describe your product’s terminology, endeavor rules, and expected behavior in the Knowledge base. Agents use that environment to choose actions and inspect outcomes.

Knowledge base

Give agents the merchandise rules they need to inspect a flow.

App graph

Maps screens and person flows seen during test runs.

Review new guidance

Review meeting suggestions before adding them to the Knowledge base.

Loved by engineering teams.

Quora

“Momentic gave us a accelerated and dependable way to validate Poe.com's AI responses, equal whenever they weren't deterministic.”

Momoko F. Head of Product Operations, Quora

30 min

regular test execution, downward from 7 hours

500+

manual test cases replaced

100%

crucial tests created in one duration

Read the complete story

Bugs caught by Momentic

Examples of use failures established by Momentic, alongside the affected stream and its impact.

117,010 before manufacturing

Detected ON A FEATURE BRANCH

New-device 2FA immediate skipped

At a person fintech app, a login routing alter bypassed the new-device verification step.

Impact

A safety checkpoint was silently skipped.

Detected BEFORE RELEASE

Page innovation stream damaged on mobile

On mobile, keyboard auto-dismissed whenever creating a new page, breaking satisfied flow.

Impact

Silent conflict in the center innovation flow.

Detected IN STAGING

Driver ETA stuck on 'calculating'

A dependency update on a ample rideshare app caused the live ETA subscription to silently neglect following a journey was booked.

Impact

Riders never saw an arrival estimate.

Detected BEFORE DEPLOY

Scheduling preparedness displayed incorrectly

Incorrect display and logic in the calendar scheduling view.

Impact

Wrong preparedness shown to users.

Detected IN CI

Timer reset whenever the display locked

At a foremost health app, an iOS lifecycle alter reset the energetic sleep timer the instant the phone locked.

Impact

Audio sessions ended mid-playback overnight.

Detected 8 MIN BEFORE DEPLOY

Saved cards dropped at checkout

At a top food-delivery marketplace, a payment-form refactor stopped pre-filling saved cards, forcing manual re-entry to pay.

Impact

Returning users abandoned checkout on mobile.

Detected IN A NIGHTLY RUN

Filters cleared whenever paginating results

At a famous online retailing marketplace, moving to leaf two reset all energetic category and cost filter.

Impact

Shoppers misplaced their refined hunt results.

Detected BEFORE MERGE

Valid promo codes rejected at the final stage

At a ample online journey marketplace, a validation alter rejected multi-segment promo codes on the final checkout step.

Impact

Discounts unsuccessful and carts were abandoned.

Detected PRE-RELEASE

Wrong subtitle tongue on archetypal perform

At a important streaming platform, a locale-detection bug auto-selected the incorrect subtitle track on first playback.

Impact

Wrong-language captions at meeting start.

Detected BEFORE RELEASE

Legacy API issues exposed

12 bugs caught in one day. Exposed bequest API issues that would have shipped undetected.

Impact

Risked shipping regressions into important release.

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