Playwright and API testing that works as fast as your AI coding agents.
Checksum runs continuously in your CI, generates thousands of tests, and keeps your suite green automatically. By the time you ship, your code is already verified.
Helping Companies Ship 10X Faster
The Problem
AI wrote the code. Who verified it?
AI-generated code produces 1.7x more errors than human-written code. The bottleneck has shifted from writing code to verifying it.
10X more code shipping
Every UI change cascades into broken selectors, failed pipelines, and a suite nobody trusts anymore.
Review loop bottleneck
Senior engineers are the new bottleneck. Review, test, prompt, wait, repeat. The cycle never ends because testing is still painfully manual.
Testing tools have gaps
PR review tools read code but don't run it. AI testing tools require devs in the loop. Production analyzers only catch issues after launch.
Why Checksum
The only platform that spans the entire problem
Capability
Checksum
Coding Agents
PR Review Tools
AI Testing Tools
Prod Analyzers
Accurate
Autonomous delivery
Continuous (every commit, every PR)
Scale (10,000s of tests)
Self-healing tests
Runs code, not just reads it
Works with your existing stack
Four core strengths
Built for the way teams ship today
Autonomous
It works while you don’t.
Checksum is a background agent, not a copilot. It detects what needs testing, generates tests, and heals broken ones. Come back to results, not tasks.
No hand-holding required.
Checksum is a background agent, not a copilot. It detects what needs testing, generates tests, and heals broken ones. Come back to results, not tasks.
No hand-holding required.
Continuous
Every commit, automatically.
Plugged into your CI, running on every PR and deployment. Testing discipline built into the workflow, not dependent on someone remembering to do it.
Always on.
Plugged into your CI, running on every PR and deployment. Testing discipline built into the workflow, not dependent on someone remembering to do it.
Always on.
Scalable
10,000 tests, not 10.
Checksum generates coverage that a human team would need months to write. Thousands of endpoints, millions of parameter variations, real edge cases.
Days, not months
Checksum generates coverage that a human team would need months to write. Thousands of endpoints, millions of parameter variations, real edge cases.
Days, not months
Self-healing
Your suite stays green.
When your app evolves and selectors change, Checksum automatically fixes broken tests. No maintenance overhead. No test debt accumulating in the background.
Zero maintenance.
When your app evolves and selectors change, Checksum automatically fixes broken tests. No maintenance overhead. No test debt accumulating in the background.
Zero maintenance.
How it Works
Your coding agent builds it. Checksum tests it.
Integrates directly with Claude Code, Cursor, and 100+ coding agents via skills and slash commands.
Coding agent ships a PR
Your AI coding agent writes the feature. Checksum is triggered automatically, or via /checksum slash command.
Checksum runs the code
Agents analyze what changed, generate targeted tests, set up infrastructure, and execute against your real code and API behavior.
Bugs get surfaced & fixed
Issues are reported back to the coding agent to iterate, or flagged for human review. Logic bugs, not just syntax errors.
You review and merge
By the time you see it, the code has already been verified. No prompt-test-prompt loops. Merge and move on.
Results
What teams see when Checksum has their back
5x code shipped
Full coverage so you can ship at the speed of AI.
80% reduction
Senior engineers spend less time in code review.
No maintenance
Self-healing suites reduce test maintenance.
1,000s of tests
Go from zero to thousands of tests in a week.
Real Customer Outcomes
Trusted by fast shipping teams
Ready to ship faster?
See how Checksum can generate and maintain your entire test suite so you can focus on building.