No spec required — learns your contract from real traffic.

DocSemantic does what no API tool has ever done.

Blast Radius. Learned Contracts. Shape-Only Privacy. CI Gate. Five Surfaces. Live Badge. All in one platform.

Start free — no card required Migrating from Optic?

Optic — archived early 2026, no longer maintained

The Optic alternative that's actively maintained

Optic got the big things right — learning your contract from real traffic and catching drift in CI. We kept those, then added what it never had: plain-English AI explanations, auto-fix PRs, and tracking of which consumer actually breaks. Bring your optic.yml and keep your CI gate.

Import your existing optic.yml and OpenAPI specs

Same PR-blocking drift gate your pipeline already expects

Free forever for solo developers — no card to migrate

Move your drift checks over Read the migration guide

Capability	Optic	DocSemantic
Contract drift detection
Learns contract from traffic (no spec)
Blocks breaking changes in CI
Plain-English AI explanations	—
Names which consumer breaks	—
Auto-fix pull requests	—
Continuous production monitoring	—
Actively maintained	—

Optic did contract capture and CI drift well — DocSemantic keeps that and stays maintained.

One job, done in three steps

Connect traffic, see who breaks, fix it. That's the whole product.

Detect drift from real traffic

Point DocSemantic at your live requests. It learns your API's real contract — no spec to write — and catches the moment a response drifts from it.

One API endpoint wired along a line through three consumers — a phone, a webhook, and a server — with only the webhook lit up in amber beside a warning triangle.

Name exactly who breaks

Every other tool watches the API. DocSemantic tracks who consumes it — so it names the exact app, service, or team that breaks when a field changes.

A git branch curving off a main commit line and merging back in, with a red and a green diff row at the merge point and a green check badge.

Fix it with one PR

Get the change explained in plain English and open a pull request that reconciles your contract with reality. Review, merge, done.

And when you need it:CI drift gateAI explanationsScheduled monitoringPrivacy mode — shapes, never values

Step 02, in practice

See the blast radius before you ship

A field changes and DocSemantic already knows who was reading it. Every drift arrives with the consumers it touches, ranked by share of affected traffic — so you can tell a harmless rename from a rollback without paging three teams to find out.

A changed API field at the origin of an expanding shockwave, with four consumer nodes on successive rings — red closest, then amber, then two dimmed further out — so distance from the change reads as decreasing severity.

Blast radius

If this change ships

3 break

GET/api/ordersfield 'total' removed

1Mobile App v4.2Critical
5,000 sessions/day
2Checkout ServiceHigh
1,200 requests/hr
3Partner WebhooksMedium
48 integrations

Ranked by share of affected traffic — highest impact first.

Six ways DocSemantic changes how you ship APIs

One platform, six capabilities. Nothing here needs an account to verify.

Blast Radius
Tells you exactly who breaks.
Learned Contracts
No spec required — learns from traffic.
Shape-Only Privacy
Optional mode sends only the shape — your data's values never leave your infrastructure.
CI Gate
Fails PRs before they break users.
Five Surfaces
CLI, API, GUI, Batch, MCP.
Live Badge
Public contract health, no signup needed.

Six panels — blast radius, learned contracts, shape-only privacy, the CI gate, five surfaces, and a live badge.Open full size

Start free. Scale as you grow.

Four plans, from a free tier to Enterprise. Higher tiers raise your monthly request allowance and add seats, longer drift history, and production integrations — so you pay as your traffic and team grow.