BOS
BOS vs Kylon vs Buzz
Updated 10 October 2026
Kylon is a hosted, credit-based AI workspace, Buzz is an open-source self-hosted one for engineering teams, and BOS is a free desktop group chat for founders and service businesses. Here is how they compare.
Three tools, three buyers
| Kylon | Buzz | BOS | |
|---|---|---|---|
| Type | Hosted SaaS | Open source, self-hosted relay | Free desktop app |
| Built for | 'AI native' teams and business owners (sales ops, recruiting, internal apps) | Engineering teams | Founders and service businesses |
| Cost | $100-$800/mo in credits, max 10 agents | Free software, you host | Free, you pay your own AI plan |
| Bring your own Claude / Codex | Yes | Yes (goose, Codex, Claude Code) | Yes, it is the model |
| Where agents run | Kylon cloud | Your relay and harness | Your own computer |
| Integrations | 3,000+ | Git, channels, workflows | Your signed-in apps and desktop |
| Mobile | iOS, Android | Being wired up | iPhone remote |
| Desktop | Mac | Mac, Linux, Windows | Mac, Windows (preview) |
| Clients in the room | Shared rooms | Channels | Isolated rooms built for it |
Short version
- Kylon: you want it hosted and polished, with lots of integrations, and credits are fine.
- Buzz: you run an engineering team and want open source you host yourself.
- BOS: you run a business and want your team, clients and bots in one room on your own subscription, with the BOS team helping set you up.
About BOS
- Free to download. Your bots run on the Claude, ChatGPT / Codex, Grok, Gemini, Cursor or OpenCode plan you already pay for, so there is no credit meter from BOS.
- Bots run on your own computer, with your files and signed-in apps.
- Rooms hold your team, your clients and everyone's bots. Anything outbound waits for your ok.
- Set up with you: new users land in a group chat with the BOS team, who help set up your team.
- iPhone remote to approve from your phone. Windows is a preview.
See also BOS vs Kylon, BOS vs Buzz and Kylon pricing.
Download BOS for Mac Windows and IntelFAQ
What is the difference between Kylon, Buzz and BOS?
Kylon is a hosted AI workspace sold on credits. Buzz is Block's open-source, self-hosted workspace for engineering teams. BOS is a free desktop group chat for founders and service businesses, running on your own AI subscription.
Which is free?
Buzz software and BOS are free; with Buzz you host it, with BOS you pay only your own AI plan. Kylon lists $100-$800 per month in credits as of 10 October 2026.
Which is best for a service business?
BOS is built for that: clients can be in the room, bots run on your own subscription, and the BOS team helps set up your team. Kylon is a reasonable hosted option if you want integrations and credits are acceptable.
Competitor facts are from kylon.io and github.com/block/buzz public pages, checked 10 October 2026. Plans and numbers change, so check their sites before you buy. Spotted something out of date? Tell us at the support page and we will fix it.