mori review
A self-hosted proxy for realistic local database and migration testing.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
mori is an open-source, self-hosted transparent database proxy for developers testing application changes against production data. It routes reads to production while capturing writes in a local shadow database, then merges the results so local testing can reflect realistic data without modifying production. The product supports PostgreSQL, CockroachDB, MySQL, MariaDB, Microsoft SQL Server, SQLite, DuckDB, Redis, and Firestore. Its strongest fit is for engineering teams that need production-like local migration testing and want database state isolation as part of the development workflow.
Its standout capability is the copy-on-write model. Local changes stay in shadow databases, while merged reads combine production data with those changes. Schema divergence tracking and migration testing help developers inspect how database changes behave before they affect production. Query inspection, change visibility, reset and reinitialize controls, and a terminal dashboard with query-routing and latency metrics add visibility during the testing process. An optional Model Context Protocol server also supports AI-agent integration. For teams working across different infrastructure, mori lists connectivity with AWS RDS, GCP Cloud SQL, Supabase, Neon, PlanetScale, Vercel Postgres, MongoDB Atlas, DigitalOcean, Railway, Upstash, Cloudflare, Firebase, and Azure, alongside SSH, GCP Cloud SQL Proxy, and AWS SSM tunneling.
The trade-off is its focused operating model: mori is a command-line proxy distributed as open-source software, with self-hosted test execution rather than a hosted service with plan tiers. That makes it a focused choice for teams comfortable managing local infrastructure and database connectivity. Teams seeking production-like data isolation, migration checks, and query-level visibility should consider it. Teams looking for a broader test suite or a hosted, plan-based database testing product should choose an alternative aligned with those needs.
mori pros and cons
- Where it wins
- Copy-on-write isolation protects production while preserving realistic data.
- Tracks schema divergence and tests migrations across multiple database engines.
- Connects with major database services, cloud providers, and tunneling tools.
- Where it doesn't
- Requires self-hosted deployment rather than a hosted plan-based service.
- Its command-line and terminal workflow may not suit teams seeking a web UI.
- It focuses on proxy-based database testing, not a general-purpose test suite.
mori fact sheet, pricing and score →
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