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ferr.dev/Browser hostcompute/ferrJSONcomparereport an errorprovider JSON
- Free allowance
- Up to 50 browser hours a month with 3 concurrent sessions on the free tier
- Verdict
- caveatusable, with a named limit or an unprobed read path
- Cost
- free tier
- Identity
- email?placeholder, not evidence; card unknown, phone unknown
- Binding limit
- request-rate50 browser hours a month on the free tier; 3 concurrent sessions
- Evidence
- documented4 sources; a first-party page was read and the sentence quoted
- Freshness
- stale on 2026-12-05checked 2026-11-04 (live); stale on 2026-12-05
| Free tier | up to 50 browser hours a month with 3 concurrent sessions on the free tier unit hours; metered on wall-clock |
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| Price | none stated |
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| Limits | - request-rate (binding) 50 browser hours a month on the free tier; 3 concurrent sessions source
- write-gated the self-hosted CLI path runs the browser on a user's own machine and is a different product from the hosted hours source
not stated |
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| Identity | email (placeholder) not published |
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| Egress | not published: the page read states no egress allowance and no overage price per TB |
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| Per-object cap | not stated |
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| Retention | not stated |
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| Interface | rest Sessions API, Chrome DevTools Protocol, SDKs for Python, Node, Rust and Go; a ferr CLI that runs the open-source browser on the user's own machine |
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| Tooling | Sessions API plus CDP; Python, Node, Rust and Go SDKs |
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| Reliability | no reliability event recorded |
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| Notes | The free tier is metered in browser hours on the vendor's 'warm capacity', not on a machine the user supplies. |
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| Evidence note | documented the pricing page was read on 2026-10-22 and states the free tier's browser-hour allowance and concurrency. |
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| Parsed numbers | |
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Evidence 4
| date | source | what it proved |
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| 2026-10-02 | ferr.dev/ | not published |
| 2026-10-22 | ferr.dev/ | 'Start free, scale when you do' with 'Up to 50 browser hours / mo' and '3 concurrent sessions' on the free tier, and 'Sub-second cold starts on warm capacity', quoted |
| 2026-11-03 | ferr.dev/ | the pricing section meters browser hours and states no egress allowance or overage price |
| 2026-11-03 | ferr.dev/ | sessions are created over a Sessions API and driven by SDK or CDP |
More fields 6
| keep rate basis | no field in the source |
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| billing model | unclassified |
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| session cap | {"wall_clock_min": null,"idle_reap_s": null,"restart_required": false,"note": "the month's 50 hours is the bound; sub-second cold starts mean a session need not be held open"} |
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| free tier kind | allowance |
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| ps | {"gib": null,"price": "profiles store cookies and local storage and are reused across sessions","durability": "saved profile","on_stop": true,"on_destroy": false,"retention": "until the profile is deleted"} |
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| net | {"out": true,"in": false,"ports": null,"static_ip": null,"ipv6": null,"allowance": "rotating consumer-connection proxies and an unmarked browser profile mode included"} |
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Unknown values 7
- chaining: a source was read and is silent on this field
- egress metered: egress metering was not published
- limits note: a source was read and is silent on this field
- per object cap stated: a source was read and is silent on this field
- reliability note: nothing of this kind was observed
- retention notes: the field may be stated in a source that was not read
- retention stated: a source was read and is silent on this field