CrabTalk vs Restate.
Durable services, workflows + virtual objects
Restate makes services, workflows and virtual objects durable through recorded execution and persistent state. CrabTalk organizes reusable tools around service-owned SQLite and bounded calls with precise resource accounting.
Which fits your work?
CrabTalk
- SQL queries and transactions within one service
- Published tools and private template deployments
- Small per-call CPU, memory and row budgets
Restate
- Durable service communication and recovery
- Object-keyed state shared across invocations
- Workflows that wait for external events or timers
Use both.
A Restate handler can call a CrabTalk HTTP tool inside a durable step for a distinct shared operation. Keep durable process coordination in Restate and use an idempotency identifier when a tool write may be retried.
Capabilities side by side.
| Capability | CrabTalk | Restate |
|---|---|---|
| Service model | Tools within a deployed Rust/Wasm service | Durable services, virtual objects and workflows |
| Application state | SQLite tables and values by key | Embedded key-value state for objects and workflows |
| State scope | One database per service deployment | Per object key or workflow execution |
| Recovery | SQL transaction per call; wake retry behavior | Recorded steps and resumable execution |
| Coordination | Service calls, crons and scheduled wakes | Durable calls, timers and external event waits |
| Compute budget | Memory, CPU and database rows per tool | Handler host resources and runtime flow controls |
| Client interface | Hosted MCP discovery plus HTTP | SDK service handlers through Restate ingress |
Keep an order decision and resume its processing.
An order policy lookup may fit a SQL tool. Recovering an order process after a failure needs durable coordination.
CrabTalk
- Deploy or reuse an order policy tool
- Keep its policy and decision records in SQLite
- Call it from the order-processing application
Restate
- Define an order workflow or virtual object
- Host and register the service with Restate
- Use durable steps and events to advance processing
CrabTalk vs Restate pricing.
CrabTalk
Callers pay a published tool’s price when it has one. Service owners pay runs, CPU, reserved memory-time and database rows, plus upstream provider usage. Memory is reserved per tool and can be lowered once for a smaller call.
Restate
Restate Cloud plans include durable actions and object storage, with action overages and retention limits. Invocations, completions and intermediate operations contribute actions; payload size can increase the count. BYOC uses reserved-capacity pricing.
Include handler compute and the selected Cloud, BYOC or self-hosted deployment. Durable actions are not equivalent to one CrabTalk tool call and are outside the calculator.
Limits that affect the choice.
- CrabTalk tools are bounded by 100 ms CPU, 128 MiB memory and a 60-second call chain. Wakes do not retain execution stacks.
- Restate already provides persistent state. Compare SQL service records with object-keyed state and workflow retention rather than treating Restate as stateless.
- Durable execution has rules for recording external operations. An external API still needs a suitable idempotency strategy when a response is lost or a call repeats.
Questions about CrabTalk and Restate.
Does Restate already store state?
Yes. Virtual objects retain key-value state by object key; workflow state belongs to a workflow execution and its retention policy.
Is Restate only a background job queue?
No. Its model includes durable services, workflows, virtual objects and communication. The comparison is about execution and data boundaries, not just scheduling.
When should I keep an existing Restate service?
When its state and durable handlers already implement the operation. A separate CrabTalk service is useful only when its reusable tools or SQL boundary serve a concrete need.
Sources.
Checked .