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Cloudflare Durable Objects
developers.cloudflare.com/workers/platform/limits/Serverless runtimecompute/cloudflare-durable-objectsJSONcomparereport an errorprovider JSON
- Free allowance
- 13,000 GB-seconds of Durable Object duration a day on the free plan.
- Verdict
- caveatusable, with a named limit or an unprobed read path
- Cost
- free tier
- Identity
- emailno card, no phone
- Binding limit
- request-rate13,000 GB-s of duration a day; a WebSocket held open on the non-hibernation API bills for the whole connection
- Evidence
- documented3 sources; a first-party page was read and the sentence quoted
- Freshness
- stale on 2026-11-22checked 2026-10-22 (live); stale on 2026-11-22
| Free tier | 13,000 GB-seconds of Durable Object duration a day on the free plan. That is a Durable Object allowance; Workers Free separately carries 100,000 requests a day unit mixed; metered on wall-clock; an object that is idle and eligible for hibernation is not billed for duration; duration is billed for the 128 MB allocation regardless of actual use |
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| Price | none stated |
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| Limits | - request-rate (binding) 13,000 GB-s of duration a day; a WebSocket held open on the non-hibernation API bills for the whole connection source
- per-object-cap 128 MB of memory per object, billed as a full 128 MB regardless of use source
a Durable Object stays active while a request, response stream, WebSocket or pending I/O is in flight |
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| Binding | request-rate the daily duration allocation binds before the 128 MB ceiling, and a non-hibernating WebSocket spends it at wall-clock rate |
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| Identity | email a Cloudflare account; no card for the Free plan |
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| Egress | served from the edge; no per-byte charge on the limits page |
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| Retention | SQLite-backed storage persists; hibernation disconnects clients without destroying state |
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| Interface | ssh a Worker binding; RPC and WebSocket to the object |
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| Tooling | Wrangler, the Workers runtime, SQLite storage per object |
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| Composes with | a stateful coordination point with a WebSocket, which is a relay substrate and not a general machine |
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| Reliability | no reliability event recorded |
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| Notes | It is a Durable Object allowance and attributing it to Workers was a category error. |
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| Parsed numbers | - has-free-tier 1
- request-rate 13000 GB
- per-object-cap 128 MB
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Evidence 3
More fields 6
| billing model | wall-clock |
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| session cap | {"wall_clock_min": null,"idle_reap_s": null,"restart_required": false,"note": "no idle kill while connected; duration billed only while active"} |
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| keep rate | {"value": 0.0,"basis": "duration is billed only while active","source": "https://developers.cloudflare.com/workers/platform/limits/"} |
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| persistent storage | {"included_gib": null,"price_gib_month": "SQLite-backed storage billed separately","durability": "survives hibernation","survives_stop": true,"survives_destroy": false,"max_retention": "while the object exists"} |
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| network out | {"allow_outbound": true,"allow_inbound_listen": true,"ports": "HTTP and WebSocket through the edge","static_ip": false,"ipv6": true,"per_session_bytes": null} |
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| free tier kind | allowance |
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Unknown values 2
- per object cap stated: the field does not apply to this kind of offer
- reliability note: nothing of this kind was observed