# Ably vs Upstash QStash (slim)

> Ably scores 75 (BB) on agent readiness against Upstash QStash's 72.3 (BB), and leads in 5 of 7 scored categories. Both do events queue. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/ably-vs-upstash-qstash.md (~1,900 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/ably-vs-upstash-qstash.json · canonical https://www.anchorterminal.com/compare/ably-vs-upstash-qstash
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

Ably scores 75 (BB) on agent readiness against Upstash QStash's 72.3 (BB), and leads in 5 of 7 scored categories. Both do events queue.

- Ably: BB 75, rank #53 of 629 · https://www.anchorterminal.com/tools/ably.min.md
- Upstash QStash: BB 72.3, rank #90 of 629 · https://www.anchorterminal.com/tools/upstash-qstash.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 Maintenance & community, 85 against 77.
- Upstash QStash, good for Agents and serverless apps that need a delayed, retried or scheduled HTTP call without running a queue.

| Category | Ably | Upstash QStash |
| --- | --- | --- |
| Reliability (16%) | 87 | 83 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 80 | 78 |
| Agent ergonomics (13%) | 87 | 83 |
| Security & auth (14%) | 64 | 61 |
| Payments & pricing (10%) | 40 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 85 | 77 |
| Transparency & trust (7%) | 78 | 81 |

| Fact (where they differ) | Ably | Upstash QStash |
| --- | --- | --- |
| Vendor | Ably Realtime Ltd | Upstash |
| Hosted endpoint | `https://main.realtime.ably.net` | `https://qstash.upstash.io/v2` |
| Transports | HTTP, SSE (legacy) | HTTP, Streamable HTTP |
| 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 hosted service under Upstash's terms of service. The TypeScript and Python SDKs and the MCP server are MIT |
| Tools exposed | none | 10 |
| Read-only variant documented | no | yes |
| MCP registry | not listed | `io.github.upstash/mcp-server` |
| Last release | 2026-09-30 | 2026-09-29 |
| Terms last updated | no date given |  |
| Privacy policy last updated | no date given |  |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | yes |  |
| Terms restrict benchmarking | not found in the text |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | yes |  |
| Popularity | 1.5M npm/wk, 407k PyPI/wk | 269 stars, 816k npm/wk, 91k PyPI/wk |