The validation engine for AI-native backend development

Try Kerno for free
1-click ● 5min install | No credit card required
Payments API
2
Claude Code v2.1.56
Welcome back Karim!
Opus 4.6 · Claude Enterprise
/Users/karim/kerno/payments-api
Tips for getting started
Run /init to create a CLAUDE.md file with instructions for Claude
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Opus 4.6 in /Users/karim/kerno/payments-api | 0% context | $0.000 | in: 0 out: 0 | session: 0s api: 0s

Understands your codebase no matter the size
Kerno builds a graph of your codebase, APIs, and dependencies.

Supports your backend language

Explore

Specilized subagents run in parallel to explore every corner of your codebase.

Map

A detailed graph is generated to give Kerno a deep understanding of your application.

Personalize

Kerno automatically incorporates your claude.md, and agents.md configs.

Automatically starts and maintains your test environment and never lets it get out of sync so you avoid flaky tests.

Supports your dependencies

Orchestrate

Kerno derives your full stack from the existing config. No separate test infrastructure to write or maintain

Run

Every test run gets a clean slate: fresh state, seeded data, mocked external services. Flaky tests from shared state become a lot rarer

Update

When schemas change or dependencies are added, Kerno keeps your environment always  in sync so nothing breaks.

Creates instant feedback loops the moment you make a change so you or your agent catch breaking changes and side effects before CI.

Everywhere your work

Baseline Behaviour

Kerno analyzes endpoints and captures their behavior across critical states and paths.

Diffs with Context

Code change are diffed against the baseline and diffs are instantly flagged with debug info.

Close the Loop

Approve intentional changes or reject accidental changes and fix with AI.

Maintains your tests in sync with your codebase
Keep your test suite complete and consistent without manual maintenance.

Run in your CI [Coming Soon]

Self-Heal

When tests break, Kerno fixes them automatically.

Sync

As your code evolves, Kerno updates, adds, and removes tests to match current behavior.

Run in CI

Work against the same baseline, keeping tests consistent across the entire team.

Everywhere you work
Works whether you're writing code or your agent is.

IDE

Catch diffs inline, without leaving your IDE

CLI

Run validation in your terminal or CI pipeline

Agent Hooks & Skills

Run automatically in your agentic workflow

Trusted by AI-native engeneering teams to ship better software

Kerno was up and running in minutes with no manual work, and it made our API migration so much smoother. We could instantly validate that every change made by Cursor worked the way we expected, and now it's a core part of our how we build.
Misch Strotz
Co-Founder & CEO, LetzAI
Using Kerno with Claude Code has been a game changer. You get quick feedback with no manual effort, and it saves you a lot time and hassle debugging integration issues post-merge.
Jonathan Bernales
CTO, Germen
Kerno saves us a lot of manual work and helps us catch side effects and issues that would definitely break our projects' backends. Our engineering team loves it.
Santiago J. Valls
Co-Founder & CTO, Bewise
Try Kerno for free
Install in 5 mins | No credit card required