CrabTalk vs Fermyon.
Fermyon Cloud + Spin
Fermyon Cloud runs Spin applications and provides managed SQLite and key-value storage. CrabTalk also supports durable SQLite, organized around reusable service tools with per-call CPU, memory and row budgets.
Which fits your work?
CrabTalk
- SQL tools discovered and called through hosted MCP
- Explicit resource budgets on each tool
- Service templates deployed as independent copies
Fermyon
- An existing Spin application and its components
- Spin SDKs and resource bindings
- A Wasm application using Fermyon Cloud data services
Use both.
Keep a Spin application on Fermyon Cloud when its existing code and storage already fit. It can call a separate CrabTalk HTTP tool for a distinct shared operation without moving its current database.
Capabilities side by side.
| Capability | CrabTalk | Fermyon |
|---|---|---|
| Runtime interface | Rust/Wasm tools and CrabTalk host APIs | Spin components and supported SDK interfaces |
| Persistent SQL | SQLite belongs to the service deployment | Managed SQLite databases bound to Spin components |
| Schema setup | Declared migrations applied at deploy | Create and prepare a database through Spin cloud tooling |
| Resource controls | CPU, rows and memory budgeted per call | Application and request limits follow the cloud plan |
| Tool access | Hosted MCP discovery and calling | Application handlers and configured access |
| Reuse boundary | Shared deployment or private template copy | Spin applications and bound cloud resources |
| Portability | Uses CrabTalk’s tool contract and host APIs | Uses Spin’s component interfaces and resource bindings |
Maintain a shared release review log.
An agent records releases and another queries review decisions. Both platforms can keep relational data across invocations.
CrabTalk
- Define release and review tools with SQLite migrations
- Set tool budgets and caller access
- Deploy and connect the agents
Fermyon
- Create or reuse the Spin application handlers
- Provision or bind SQLite and prepare its schema
- Deploy and configure the required client or tool endpoint
CrabTalk vs Fermyon pricing.
CrabTalk
Owners pay runs, CPU, reserved memory-time and database rows. A call can lower its memory reservation once when smaller inputs need less.
Fermyon
Fermyon Cloud publishes Starter, Growth and Enterprise plans with application, request, SQLite, key-value storage and bandwidth limits. Plan capacity determines the relevant estimate.
Compare actual request volume and data requirements against the selected plan. Fermyon Cloud is outside the calculator; these terms do not describe every Fermyon hosting product.
Limits that affect the choice.
- CrabTalk tools have at most 100 ms CPU and 128 MiB memory, with at most 10 GiB per service database within account capacity.
- SQLite persistence is available on both. Compare the database binding, schema process, access boundary and execution accounting.
- Spin applications and CrabTalk services use different interfaces. A Wasm binary needs the correct host contract; this page covers Fermyon Cloud rather than SpinKube or other Fermyon products.
Questions about CrabTalk and Fermyon.
Does Fermyon Cloud already provide managed SQLite?
Yes. Its documentation shows binding a named SQLite database to Spin components and preserving data between invocations. Persistence alone does not distinguish these platforms.
Does a Spin application run unchanged on CrabTalk?
No general binary compatibility follows from Wasm. Exported tools, host APIs, resource access and execution budgets need to match the CrabTalk service model.
When should I keep an existing Spin application?
When its handlers, component dependencies and storage already implement the operation. Evaluate CrabTalk for a separate reusable tool boundary, rather than adding a migration without a concrete benefit.
Sources.
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