Become the category leader
Ship fast without looking in the rear-view mirror
Everything in Kerno Pro
Teams shipping with Kerno
Agents and engineers at these companies use Kerno
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 how we build.
Misch StrotzCo-Founder & CEOUsing Kerno with Claude Code has been a game changer. You get quick feedback with no manual effort, and it saves you a lot of time and hassle debugging integration issues post-merge.
Jonathan BernalesCTOKerno 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. VallsCo-Founder & CTORegressions have always been a huge bottleneck for our team. Kerno has been a force multiplier helping us ship releases much faster without the manual overhead of QA.
Ronan HigginsCTOYour team’s AI expert backend tester
Kerno plugs into the coding agent your team already uses and starts testing against your real stack from day one. No dedicated QA hire, no test suite to babysit.
Onboard in a few hours, no setup from your team
Kerno indexes your codebase and dependencies and generates its first test baseline without any setup work from your team.
Zero ongoing maintenance, evolves with your product
It retires stale scenarios and writes new ones as your code changes, so the suite never drifts from what’s actually true.
Regression and security checks, integrated with your E2E tests
It runs against your live stack and real dependencies, catching what static review and unit tests miss.
Every layer of your backend, tested on every change.
End-to-end user flows
Verify complete user journeys across your APIs, from the first request to the outcome read back from your system.
Contract & schema validation
Validate request and response structures, data types, required fields, serialization rules, and version compatibility.
Authorization & authentication
Review token validation, role-based access rules, permission scopes, session handling, and all credential-related flows.
Error handling & resilience
Validate status codes, error body formats, retry behavior, backoff procedures, timeout handling, and controlled fallbacks.
Boundary & edge cases
Validate payload size limits, pagination behavior, null or empty values, malformed inputs, and constraint-based validation.
Security · OWASP Top 10
Validate broken object- and function-level authorization, injection, excessive data exposure, mass assignment, and SSRF.
MCP server testing
Verify each tool your MCP server exposes, including returned content, structured output, schema conformance, and error handling.
AI agent testing
Verify how your agent calls tools, chains model steps, and handles streaming responses, with OpenAI, Anthropic, and others mocked for deterministic runs.
Move faster without breaking things
Speed is the whole game at your stage. Kerno removes the tradeoff between shipping fast and shipping broken, so your best engineers spend their time on the roadmap instead of the review queue.
Every new hire focuses on shipping
New engineers ship against a verified baseline from day one, instead of first learning the quirks of your test suite.
Increases trust in every code change
Every change is validated before it reaches a pull request, so reviewers have less to check and fewer breaks reach production.
Fast-track or skip code review
When Kerno confirms a change matches the baseline, reviewers can wave it through instead of re-checking it by hand.
Get ahead of your first security compliance review
Your first enterprise deal will come with a security questionnaire whether or not you’re ready for one. Continuous regression and security testing on every change gives you evidence toward PCI, SOC 2 Type 2, and ISO 27001, before an auditor ever asks.
PCI
Payment endpoints are tested for broken access control, injection, and data exposure on every change.
SOC 2 Type 2
Type 2 asks for evidence over time. Kerno records a dated test run for every change.
ISO 27001
Your access control and input validation rules become scenarios Kerno reruns on every release.
Your critical flows covered in under a day
Install Kerno, map your critical flows, and roll out to your team without any friction. Set up once.
Install, calibrate and map your flows
Point Kerno at your repo. It maps every entry point, connects to your running app and its dependencies, and maps your critical user flows with you.
Cover your critical flows
Kerno tests each critical flow end to end and builds baseline tests for every API, task and event behind it.
Roll out to your team
The Kerno MCP connects to your agents, validating every code change and re-running the flows it touches before they reach production.
At a fraction of the cost of an FTE QA hire
Redeploy your QA budget to shipping faster.
- Eligibility
- Pre-Series A, under $2M revenue in the past 12 months
- Price lock
- Two years
Everything in Kerno Pro
- Unlimited test runs
- Unlimited repositories
- Unlimited users
- Team and codebase analytics
- CI integration
01How long does it take to get started?
About an afternoon. Install Kerno, let it baseline your backend, and connect your team. You get full coverage in under a day, and Kerno keeps the suite current with zero ongoing maintenance.
02What happens when Kerno flags something that isn’t actually a bug?
You decide. Kerno shows the diff and asks whether the change was intended — approve it and the baseline updates to match, or reject it and fix the code. Confirmed behavior is never flagged again.
03Does Kerno replace hiring a QA engineer?
It replaces the manual grind of writing and maintaining regression, security, and integration tests by hand. Most early-stage teams use it to delay their first QA hire and redeploy that budget into shipping instead.
04Is our code safe with Kerno?
Kerno encrypts everything end to end and never retains your code. A SOC 2 Type 2 audit is in progress, and your private code is never stored or used to train models.
05How is pricing structured for startups?
Kerno for Startups is $25 per developer per month — 50% off Kerno Pro for pre-Series A startups with under $2M revenue in the past 12 months — locked in for your first two years.