Fission vs Restate
Fission
fission.io
Restate
restate.devSide by side
| Figure | Fission | Restate |
|---|---|---|
| Price from | — | $75/mo |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 0 | 3 |
| Spec score · Serverless Platforms | 7.7 (#12) | 7.9 (#10) |
| Integrations | The homepage says Fission integrates with Fluentd for CLI logs, Prometheus for metrics, and Istio for service mesh monitoring and tracing. | Listed integrations include Vercel AI SDK, OpenAI Agents SDK, Google ADK, Google Gemini, Pydantic AI, and LangChain. |
| Product | Fission is an open source framework for running serverless functions on Kubernetes. | Restate is a durable execution runtime for building resilient services, workflows, and AI agents. |
| Support | The project directs users to its Slack community and provides troubleshooting guides and a CLI command for collecting support diagnostics. | The cloud page offers a contact sales option and a request access link for BYOC. |
Plans
In their own words
Restate
Restate is a durable execution runtime for building resilient services, workflows, and AI agents. It records progress during execution and resumes after failures without discarding completed work. Its building blocks include durable functions, workflows, Virtual Objects, queues, durable RPC, timers, signals, and flow control. The interface exposes execution journals and controls to cancel, kill, restart, or pause executions. Restate runs as a self-hosted single binary, managed Restate Cloud, or BYOC in a customer cloud account. Listed SDKs include TypeScript, Python, Java, Go, Kotlin, Rust, and Ruby. Integrations include Vercel AI SDK, OpenAI Agents SDK, Google ADK, Google Gemini, Pydantic AI, and LangChain. The homepage reports under 10ms P99 latency overhead under load for durable actions. The Free plan is free for 50k durable actions monthly with no credit card. Restate Cloud starts at $75 a month.