Effect
A TypeScript library for building reliable production systems with structured concurrency and error handling
Recommended for
- Solo / Indie
- Idea-Stage
- Pre-Seed
- Seed
SSIE
Stage Fit Recommendations
Following data shows why Effect is recommended for listed teams. The Fit Score represents the percentage fit of Effect to each company stages, as calculated by the SSIE.
Stage
Fit Score
Fit Reasons
Solo / Indie
$0–$2,000 MRR
68- Manages typed errors in function signatures
- Collects or short-circuits failures automatically
Idea-Stage
$0
84- Implements automatic retries with backoff
- Provides type-safe service definitions for dependency injection
Pre-Seed
$0–$10k MRR
84- Performs automatic dependency resolution
- Enables easy mocking for tests via dependency injection
- Supports structured concurrency with fibers
Seed
$10k–$100k MRR
68- Executes parallel tasks with configurable limits
- Includes built-in OpenTelemetry tracing
- Provides structured logging and metrics collection
Effect is a TypeScript library designed to enable developers to build production-ready systems. It provides tools for structured concurrency, error handling, and effect composition. The library supports sequential, unbounded, and numbered concurrency models. It includes utilities like effect.all for combining multiple effects and returning results based on input structure. Effect is inspired by Kit Langton's visual effect system and is used in real-world production systems. The library is open source and available on GitHub. It is used by companies like Cloudflare and OpenCode. Effect also offers interactive examples and documentation for developers.
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