# Ably vs PubNub (slim)

> Ably scores 75 (BB) to PubNub's 68.1 (B) for realtime events. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/ably-vs-pubnub.md (~2,250 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/ably-vs-pubnub.json · canonical https://www.anchorterminal.com/compare/ably-vs-pubnub
- 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 PubNub's 68.1 (B), and leads in 6 of 7 scored categories. Both do realtime events.

- Ably: BB 75, rank #59 of 950 · https://www.anchorterminal.com/tools/ably.min.md
- PubNub: B 68.1, rank #230 of 950 · https://www.anchorterminal.com/tools/pubnub.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 76; Agent ergonomics, 87 against 71; Transparency & trust, 78 against 64. Also Agent-ready, a grade of BB or better.
- PubNub, good for Live fan-out to many connected clients with presence and history, and for an agent that manages a PubNub account through MCP. Also Runs on your own machine.

| Category | Ably | PubNub |
| --- | --- | --- |
| Reliability (16%) | 87 | 76 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 80 | 77 |
| Agent ergonomics (13%) | 87 | 71 |
| Security & auth (14%) | 64 | 63 |
| Payments & pricing (10%) | 40 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 85 | 83 |
| Transparency & trust (7%) | 78 | 64 |

| Fact (where they differ) | Ably | PubNub |
| --- | --- | --- |
| Vendor | Ably Realtime Ltd | PubNub Inc. |
| Hosted endpoint | `https://main.realtime.ably.net` | `https://ps.pndsn.com` |
| Transports | HTTP, SSE (legacy) | HTTP, stdio |
| Auth | API key | OAuth or key |
| Licence | Proprietary service under Ably's terms of service. The SDKs and the Ably CLI on GitHub are Apache-2.0 | Proprietary service under PubNub's Terms and Conditions. The SDKs and the MCP server on GitHub are source-available under the PubNub Software Development Kit Licence Agreement, which is not an OSI licence |
| Tools exposed | none | 17 |
| MCP registry | not listed | `io.github.pubnub/mcp-server` |
| Last release | 2026-09-30 | 2026-09-22 |
| Terms last updated | no date given | 2023-05-05 |
| Privacy policy last updated | no date given | 2026-04-01 |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | not found in the text | yes |
| 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 | 284k npm/wk |