RepoRehearsal
Isolated sandbox · your source is never modified

Train on your repository, not someone else's incident library.

Curated scenario libraries teach you their bugs. RepoRehearsal turns your own codebase into a safe, scored incident, then grades the repair on evidence, not multiple choice.

Start a rehearsalUse your repository ↗
No private repository or API key required.
SEV-2Billing service
14:14 UTC

New accounts cannot open billing

HTTP 500 errors began shortly after a database migration. Existing customers appear unaffected.

billing-apiDegraded
authenticationHealthy
dashboardHealthy
error  GET /billing → 500   request_id=req_8f2a

From repository to scored rehearsal

The evidence-driven work between “something is broken” and “we know it is safe.”

I

Map the repository

Identify services, routes, migrations, tests, and reliability risks before selecting an exercise.

II

Break an isolated copy

Inject a deterministic fault only after the clean baseline passes. Your source stays untouched.

III

Investigate & repair

Use code, logs, tests, database evidence, and health checks. Then receive a scored report.

Choose the kind of failure.

Each case has a known root cause, observable evidence, a safe repair path, and deterministic validation.

DB

Database migration

Unsafe schema transitions, incomplete backfills, and mismatched record creation paths.

CFG

Configuration failure

Container host mismatches and environment-specific connection errors.

API

External dependency

Provider schema drift, partial responses, retry safety, and timeout handling.

SUPPORTED LANGUAGES

TypeScriptJavaScriptPythonJavaCC++C#GoRustRubyPHPKotlinSwiftScala

WHY REPOREHEARSAL

Realistic practice is common now. Practice on your own code isn't.

Free scenario libraries and chat-based simulators both build real skill. Here's specifically where RepoRehearsal goes further.

CapabilityRepoRehearsalCurated scenario librariesChat-based simulators
Practice on your own repositoryNot just a fixed set of sample apps.✓Fixed scenarios onlyFixed scenarios only
Deterministic grading with hidden checksCatches a patched crash that leaves the root cause unfixed.✓Multiple choiceFacilitator-judged
Real code, real logs, real database stateYou read an actual stack trace, not a scripted prompt.✓✓Simulated dialogue
Team incident authoring from a real PRTurn your own postmortem into training material.✓——
Candidate debugging screensOne incident link, every applicant, comparable results.✓——
Starting priceFree tier included either way.Free, Pro from $9.99/moFreeFrom ~$100+/mo per seat

Your repository stays yours.

Temporary copies. Redacted secrets. Allowlisted commands. Expiring workspaces.

Training a team, or hiring? Turn your own incidents into practice. See how →

Start a rehearsalSecurity and privacy details →