Head to head
GrayMatter vs Heystack
Same numbers we show everywhere else, lined up. Ratings come from users, the grade comes from our scanner, adoption comes from public registries.
No reviews yet
Persistent agent memory as a single Go binary: knowledge graph, TUI observability, zero infra.
Full listing
No reviews yet
Observability for AI apps: investigate traces, logs, LLM usage, replays and crashes; manage alerts.
Full listingThe short version
Neither has been reviewed yet, so the comparison rests on the scan and the public usage numbers. The safety scan favours Heystack (93/100 against 70). Heystack is hosted and callable through the gateway; GrayMatter runs on your own machine. GrayMatter has noticeably more public adoption.
| GrayMatter | Heystack | |
|---|---|---|
| User rating | No reviews yet | No reviews yet |
| Safety grade | B70/100 | A93/100 |
| Adoption | Growing | Growing |
| GitHub stars | 471 | 0 |
| Downloads / week | – | – |
| Runs where | Your machine (local) | Hosted (remote) |
| Gateway-ready | No | Yes |
| Tools | — | — |
| Write actions | — | — |
| Price per call | Free | Free |
| Licence | MIT | — |
| Last release | 2026-09-20 | 2026-09-19 |
| Category | AI and agents | AI and agents |