Real end-to-end tests,
in seconds.
API tests that keep up with your code.
Stresseur learns your real API flows, turns them into tests, and keeps them current with every PR.
Real end-to-end tests at the API level, fast enough to run after every change. No browser to start, no pages to render.
Functional · Regression · E2E · Stress
Dev-only SDK · runs locally · review every generated test
1 · Record real usageRecording
- POST/login200 · 41ms
- POST/cart200 · 12ms
- POST/orders201 · 63ms
- POST/payment200 · 88ms
Stresseur watches API calls while you develop.
2 · Learn the flow
✓ checkout flow created · from recorded dev traffic
3 · Keep tests current
GitHub · Pull request #1284
Payment API changed
/v1/payment → /v2/payment
Test failed
Checkout still uses the old payment API
Stresseur AI
Finding the affected checkout test…
Suggested update
Use /v2/payment in checkout
All tests pass
21/21 · Ready for review
When your API changes, Stresseur finds and proposes the required test updates.
Runs where your team already works
Use your app.
Stresseur learns it.
Dev-only SDK
recording · localhost:3000
POST/login200 · 41ms
POST/cart200 · 12ms
POST/orders201 · 63ms
POST/payment200 · 88ms
Living API map
4 endpoints · 1 flow · from real usage
Test suite
tests/
login.yaml✓ 6
checkout.yaml✓ 9
orders.yaml✓ 8
checkout.stress.yaml10k VU
generated · runs on every PR
Pull request
Stresseurbot✓ 21 passed
↻ 3 updated
flow: checkout
before you merge
Learn
Real traffic in dev becomes a living map of your API.
Test
Flows become functional, regression, E2E and stress tests.
Maintain
Every PR runs affected flows and proposes updates.
What it can do
From one endpoint
to 10,000 users.
Use the same learned API flows for everyday testing, regression coverage and distributed stress tests.
tests/orders.yaml
8 tests generated✓creates an order› 201
✓validates the items schema› 201
✓rejects missing auth› 401
✓rejects negative quantity› 422
✓edge: empty items array› 422
✓edge: duplicate idempotency key› 409
✓GET /orders/:id returns the order› 200
✓GET /orders/:id with unknown id› 404
all passing · 0.8s · runs on every PR
PR #1284 · src/routes/orders.ts
2 flows affected@@ checkout flow @@
- router.post('/v1/orders', createOrder)
+ router.post('/v2/orders', createOrder)
✓3 tests updated to the v2 schema
✓3 tests generated for the new fields
▲missing coverage: DELETE /v2/orders/:idtest proposed
proposed as reviewable changes · nothing merges silently
checkout.e2e · the learned flow
4 steps✓POST/login200 · 41ms
✓POST/cart200 · 12ms
✓POST/orders201 · 63ms
✓POST/payment200 · 88ms
all passing · 1.9s · replayed exactly as your app was used
checkout.stress · distributed
10,000 virtual usersVUs
10,000
RPS
4,120
p95
418ms
errors
0.31%
✗ bottleneck: /payment connection pool saturates at ~8.2k VU — raise the pool size, or split the runner
From your editor, terminal, CI or pull request.
A test engineer inside
every pull request.
Stresseur reads the diff, finds the affected flows, runs the right tests and proposes any necessary updates before you merge.
@@ -34,3 +34,3 @@
router.post('/cart', listCart)
- router.post('/v1/orders', createOrder)
+ router.post('/v2/orders', createOrder)
router.post('/payment', pay)
Affected flow
Checkout flow affected→3 tests updated→3 new tests generated
@stresseur testStresseurbotcommented 1 hour ago21 tests · 2.4s · runs on every PR
Rerun after the suggestion: ✓ 21/21 green
Full report → stresseur.dev/r/run_9x2k · nothing changes without your approval
Three ways to run it
Same tests, wherever
you work.
AI API testing that fits the tools you already use. API test generation, end-to-end API tests, regression tests, and API load testing all come from the same recorded flows.
Studio
The local visual app
Open your recorded flows, edit them, and run end-to-end API tests on your own machine.
Download Studio →CLI
For Claude Code and Cursor
Your coding agent records flows, generates tests, and reruns the suite after every change. Fast enough to run on every edit.
GitHub bot
Runs on every PR
Pull request testing that reads the diff, runs the affected flows, and proposes test updates before you merge. Flows also run in GitHub Actions.
GitHub Action →Built on DevTools
Stresseur runs on the open-source DevTools engine.
Open-source engine
Apache-2.0, runs locally
400+ GitHub stars
the-dev-tools/dev-tools
Local-first
Observed flows remain local.
Automatically redacted
Secrets and auth are removed before anything is stored.
Reviewable changes
Nothing changes without your approval.
Let Stresseur learn your API.
Join the early access and see your first API map in five minutes.
Free during early access · local runner remains open source