# Ably vs Hook0 (slim)

> Ably scores 75 (BB) on agent readiness against Hook0's 64.6 (B), and leads in 3 of 7 scored categories. Hook0 leads on transparency & trust. Both do events webhooks send. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/ably-vs-hook0.md (~2,050 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/ably-vs-hook0.json · canonical https://www.anchorterminal.com/compare/ably-vs-hook0
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

Ably scores 75 (BB) on agent readiness against Hook0's 64.6 (B), and leads in 3 of 7 scored categories. Hook0 leads on transparency & trust. Both do events webhooks send.

- Ably: BB 75, rank #58 of 842 · https://www.anchorterminal.com/tools/ably.min.md
- Hook0: B 64.6, rank #313 of 842 · https://www.anchorterminal.com/tools/hook0.min.md
- Ably, good for Fan-out of live messages to many connected clients, presence and resumable streams, with webhooks and queues as ways to get channel events to a backend. Ahead on Reliability, 87 against 70; Agent ergonomics, 87 against 65. Also Agent-ready, a grade of BB or better; A hosted endpoint, with nothing to install; No incidents deducted, where Hook0 loses 4 points for them.
- Hook0, good for A product that has to send signed webhooks to its own customers' endpoints with retries, replay and a delivery log, and that wants EU hosting or the option to self-host the same code. Ahead on Transparency & trust, 84 against 78. Also Runs on your own machine.

| Category | Ably | Hook0 |
| --- | --- | --- |
| Reliability (16%) | 87 | 70 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 80 | 79 |
| Agent ergonomics (13%) | 87 | 65 |
| Security & auth (14%) | 64 | 64 |
| Payments & pricing (10%) | 40 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 85 | 87 |
| Transparency & trust (7%) | 78 | 84 |

| Fact (where they differ) | Ably | Hook0 |
| --- | --- | --- |
| Vendor | Ably Realtime Ltd | FGRibreau SARL |
| Hosted endpoint | `https://main.realtime.ably.net` | no (local only) |
| Transports | HTTP, SSE (legacy) | HTTP, stdio |
| Licence | Proprietary service under Ably's terms of service. The SDKs and the Ably CLI on GitHub are Apache-2.0 | SSPL-1.0 for the server (source available, not an OSI licence). The SDKs and the `hook0-mcp` server are MIT per crates.io and npm. Hook0 Cloud is a hosted service under Hook0's terms of service |
| Tools exposed | none | 23 |
| Read-only variant documented | no | yes |
| Last release | 2026-09-30 | 2026-09-21 |
| Terms last updated | no date given | 2026-06-27 |
| Privacy policy last updated | no date given | 2026-09-09 |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | 1.5M npm/wk, 407k PyPI/wk | 1.5k stars, 507 npm/wk, 11 PyPI/wk |