CrabTalk vs Rivet.
Actors + actor-local SQLite
Both support durable SQLite and agent access. CrabTalk budgets memory per tool call; Rivet organizes long-lived state, connections and work around independently keyed Actors.
Which fits your work?
CrabTalk
- Small memory reservations per call
- Several agents sharing one SQL service
- Tools with access and usage accounting
Rivet
- One stateful Actor per user or session
- Realtime connections and broadcasts
- Actor queues, scheduling and lifecycle
Capabilities side by side.
| Capability | CrabTalk | Rivet |
|---|---|---|
| Unit of state | One service deployment | An Actor addressed by key |
| Memory scope | 1–128 MiB reservation per tool call | Actors execute on shared Actor Nodes |
| Per-call sizing | Lower the running call’s budget once | Size and scale the nodes running Actors |
| SQLite | Per service; migrations applied at deploy | Per Actor; raw SQL and Drizzle |
| MCP | Hosted discovery and calling | Hosted Actor inspection and action calling |
| Realtime | Request and response tool calls | WebSocket connections and event broadcasts |
| Lifecycle | Execute a tool against durable service data | Actors sleep and wake with state intact |
A task list for each customer.
An agent adds tasks and a reviewer updates their status. Both platforms can preserve the list; their unit of isolation differs.
CrabTalk
- Define task tools and SQLite migrations
- Use customer keys or separate deployments
- Connect agents to the service tools
Rivet
- Define task actions and actor-local SQLite
- Get or create an Actor by customer key
- Call actions and subscribe to changes
CrabTalk vs Rivet pricing.
CrabTalk
Pay for calls, CPU, reserved memory-time and database rows, subject to plan allowances. Smaller call reservations reduce memory-time charges.
Rivet
Rivet Cloud lists control-plane plans and monthly Actor Node sizes. Bringing your own compute changes which infrastructure costs Rivet bills.
Estimate the whole Rivet cluster and its utilization. Node capacity shared across Actors does not map directly to an isolated per-call memory charge; Rivet is outside our calculator.
Limits that affect the choice.
- CrabTalk tools have a maximum 100 ms CPU and 128 MiB budget. A long-lived process or realtime connection calls for another execution model.
- Both platforms have SQLite. Compare state boundaries, migrations and access patterns rather than treating persistence as exclusive.
- CrabTalk deployments do not automatically create keyed Actors. Model customer records or deploy separate services when isolation requires them.
Questions about CrabTalk and Rivet.
Does Rivet already support MCP?
Yes. Rivet’s hosted MCP endpoint can inspect Actors and call their actions with approved access. MCP availability alone does not distinguish these platforms.
Can Rivet keep SQL data after an Actor sleeps?
Yes. Its actor-local SQLite is durable and survives restarts. CrabTalk instead owns the database at the service deployment level.
When does CrabTalk’s memory model help?
When individual tools need small reservations and inputs vary. A call can lower its reservation before work; this is reserved memory billing, not automatic measurement of live usage.
Sources.
Checked .