Web Development · head to head
FastAPI vs Restate
FastAPI
Web Development
A modern, fast, high-performance web framework for building APIs with Python
- From
- Free
- Free plan
- Yes
Restate
Developer Tools
Durable execution engine in Rust with a free tier and low-latency workflows
- From
- Free
- Free plan
- Yes
The short version
- Each has a real cost: FastAPI no built-in ORM, requires separate database libraries; Restate the runtime is under a Business Source Licence rather than an open source licence, so building a competing managed offering on it is prohibited and some procurement functions will reject it on licence grounds alone.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which FastAPI and Restate actually diverge.
Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in FastAPI
Nothing recorded that Restate does not also cover.
Only in Restate
- Durable execution
- Virtual objects
- Single binary runtime
- Multi-language SDKs
- Workflows and sagas
- Restate Cloud
What people use each for
The jobs each tool is most often brought in to do.
FastAPI
- Building production-ready REST APIs with automatic validationnot Restate
- Serving machine learning model predictions as REST servicesnot Restate
- Building crisis management and orchestration platformsnot Restate
- Enabling real-time APIs with WebSocket connectionsnot Restate
- Rapid API development reducing boilerplate code significantlynot Restate
Restate
- Payment or order flows where a crash between two external API calls must not double-charge or lose the ordernot FastAPI
- AI agent loops that call tools over minutes or hours and must survive a deployment mid-runnot FastAPI
- Replacing hand-rolled retry, idempotency key and outbox code across a set of microservicesnot FastAPI
- A small team that wants durable workflows without operating a Temporal cluster and its databasenot FastAPI
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
FastAPI
- No built-in ORM, requires separate database libraries
- Python-only, cannot build with other languages
- Async/await learning curve for developers new to async programming
- Production deployment requires separate ASGI server configuration
Restate
- The runtime is under a Business Source Licence rather than an open source licence, so building a competing managed offering on it is prohibited and some procurement functions will reject it on licence grounds alone.
- Restate Cloud jumps from a free fifty thousand actions straight to 300 US dollars a month for twenty million, so a workload sitting at a few hundred thousand actions pays enterprise-shaped money for hobby-shaped volume.
- It is a young project against Temporal’s established base, so hiring engineers who already know it is unrealistic and the answer to most questions is in the docs rather than on Stack Overflow.
- The programming model requires structuring code around durable handlers and virtual objects, which is a genuine rewrite for existing services rather than a library you add.
- The single-binary simplicity that makes small deployments cheap also means fewer operational knobs at very large scale than a system designed as separable components.
Pricing, plan by plan
FastAPI
FreeNo published plan breakdown. See the FastAPI review.
Restate
Free- FreeFree
- Fifty thousand durable actions per month
- No credit card required
- Community support
- Starter$300/month
- Twenty million actions per month
- Two hundred actions per second, bursting to one thousand
- Twenty GB storage
- Pro$1000/month
- Fifty million actions per month
- Five hundred actions per second, bursting to two thousand
- Fifty GB storage
- Enterprise$undefined/year
- Negotiated volume
- Twenty-four seven P0 support
- 99.99 per cent SLA
Which should you pick?
Choose Restate if
- You need durable execution.
- You want to start without paying.
- You work on Linux, macOS, Web.
- You also want virtual objects.
Questions people ask
- Is FastAPI or Restate better?
- Neither clearly leads. FastAPI starts at Free and Restate at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, FastAPI or Restate?
- FastAPI starts at Free and Restate at Free.
- Does FastAPI or Restate run on more platforms?
- FastAPI runs on Web. Restate runs on Linux, macOS, Web.
- Can I use FastAPI for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is FastAPI best used for?
- FastAPI is most often used for building production-ready rest apis with automatic validation, serving machine learning model predictions as rest services, building crisis management and orchestration platforms, enabling real-time apis with websocket connections. Of those, building production-ready rest apis with automatic validation and serving machine learning model predictions as rest services are not what Restate is typically brought in for.
- What can FastAPI do that Restate cannot?
- Restate covers Durable execution, Virtual objects, Single binary runtime, Multi-language SDKs.
Answered from the vendors’ own pages
FastAPI: Is FastAPI free to use?
Yes. FastAPI is free and open-source under the MIT License. It costs nothing to download, use, or deploy in production. An optional paid service, FastAPI Cloud, offers one-command deployment for additional convenience, but the core framework is free.
SourceRestate: Is Restate open source?
The SDKs are MIT. The runtime is under a Business Source Licence, which permits self-hosting but not offering it as a competing service.
FastAPI: Can I use FastAPI for commercial applications?
Yes. FastAPI's MIT License permits unrestricted commercial use, modification, and distribution. You can build and sell products powered by FastAPI without licensing fees or restrictions.
SourceRestate: How does it compare with Temporal?
Same problem, different shape: one Rust binary with embedded storage instead of a server plus database plus workers, and lower per-step latency.
FastAPI: Does FastAPI include a database or ORM?
No. FastAPI does not include a built-in database or ORM. You must add separate libraries like SQLAlchemy for database access. This gives flexibility to choose the database solution best suited to your project.
SourceRestate: Is there a free tier?
Yes, fifty thousand durable actions a month on Restate Cloud with no card required.
FastAPI: What Python versions does FastAPI support?
FastAPI supports Python 3.7 and later. Older Python versions are not compatible, so you must run at least Python 3.7 to use FastAPI.
SourceRestate: Which languages are supported?
TypeScript, Java, Kotlin, Go, Python and Rust.
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- Restate vs Jitsu
- Restate vs Okteto
- Restate vs Argo CD
- Restate vs Steampipe
- Restate vs Cloud Native Buildpacks
- Restate vs Deno
- Restate vs Visual Studio Code
- Restate vs Turborepo
- Restate vs Keycloak
- Restate vs Garden
- Restate vs GitLab CI/CD
- Restate vs HCP Terraform
- Restate vs Helm
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