Cadence

What Cadence is

Cadence is an open-source workflow engine for building fault-tolerant, stateful distributed applications. Its durable workflows can continue after process restarts, infrastructure failures or pauses, with workflow state reconstructed through replay. This makes determinism an important requirement: workflow code must behave consistently when replayed. Official SDKs are listed for Go, Java and Python, with a community Ruby client. Schedules support recurring runs, overlap policies, pausing, updates, backfills and execution history. Deployment options include embedded SQLite, Docker Compose and Kubernetes with Helm. For workflow history, production integrations include Cassandra, MySQL or PostgreSQL; visibility options include Elasticsearch, OpenSearch or Apache Pinot. Kafka is listed for search indexing, and Prometheus, StatsD and M3 for metrics. TLS can be configured for backing-service connections, and SDK connections to the frontend support mutual TLS. Cadence targets application developers building workflows and platform engineers operating shared infrastructure. It is self-hosted, open source and listed as free, with no license key, usage limits or per-execution fee.