App-vNext/Polly

Health v2 · maintenance only

Adoption not part of the score

14230 stars · 1285 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Polly is a .NET resilience and transient-fault-handling library that lets developers express resilience strategies such as Retry, Circuit Breaker, Hedging, Timeout, Rate Limiter, and Fallback in a fluent, thread-safe manner. It is a zero-dependency, lightweight library targeting .NET Standard, usable anywhere .NET runs.

Use cases

• retry failed HTTP calls with exponential backoff
• add circuit breaker to microservice calls
• wrap Entity Framework calls with transient fault handling
• apply timeout and bulkhead isolation to protect under-load systems
• add fallback behavior when external services fail
• rate-limit outgoing requests to a dependency

When to choose

• building fault-tolerant .NET applications that call external services or cloud APIs
• needing a comprehensive, fluent resilience framework for .NET similar to Hystrix
• wanting a zero-dependency library that works across .NET Standard targets

When to avoid

• working outside the .NET ecosystem
• needing resilience for a platform with native alternatives like Java's Resilience4j
• requiring chaos engineering as the primary goal (Simmy is a separate contrib)

Facets

library · maturity stable

middleware rate-limiting caching error-handling concurrency developer-tools backend microservices cloud-computing dotnet cross-platform resilience circuit-breaker retry transient-fault-handling timeout bulkhead-isolation hedging fallback fault-tolerance

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