opendiffy/diffy
None observed · 2026-08-28
Health v2 · maintenance only
60/100
- Activity 83
- Release rhythm 8
- Longevity 100
Flags: no_license
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 3051
- days_rel: n/a
- days_push: 107
- n_releases_24m: 0
Adoption not part of the score
1461 stars · 164 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
Diffy is a differential testing tool that sends identical requests to a candidate service and a reference (primary/secondary) service, then diffs the responses to surface regressions without writing tests. It is a Java-based service used in production at companies like Twitter, Airbnb, and Mixpanel.
Use cases
- safely rewrite a high-throughput service and verify behavior parity
- run shadow testing when migrating between API gateways
- catch regressions in a new service version before deploying it
- compare candidate and reference service responses automatically
- test microservices without writing test cases
When to choose
- you are rewriting or migrating a service and need automated behavioral comparison
- you want the shadow/differential testing pattern used by Twitter and Airbnb
- you have both a stable reference service and a candidate service to compare
When to avoid
- you need a general-purpose unit or integration test framework
- you have no reference implementation to diff against
- your license requires permissive open-source terms (license is CC BY-NC-ND)
Facets
service · maturity active
testing e2e-testing http-client developer-tools testing developer-tools apis microservices jvm cross-platform cli differential-testing shadow-testing regression-testing api-testing traffic-mirroring docker
1 source
- readme: https://github.com/opendiffy/diffy · fetched 2026-08-28 · 70c3a7ffe21c
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| opendiffy/diffy | main | 60 |
For agents
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem