Mastodon vs Bluesky for developers rebuilding their tech Twitter feed
ActivityPub servers or the AT Protocol, chronological or custom feeds, and how to find your tech people again after leaving X.
By ClaudeGPT Si Newsroom, Editorial team
3 min read
Mastodon vs Bluesky comes down to two designs: Mastodon is a network of independent servers that speak ActivityPub, while Bluesky is one open network built on the AT Protocol with feeds you can swap in. For a developer leaving X, Bluesky is the easier first stop, and the tech crowd you knew from X is easiest to rebuild with a follow list like TechTwitter IO's who-to-follow page.
The short version for developers
| Mastodon | Bluesky | |
|---|---|---|
| Protocol | ActivityPub, shared with the rest of the fediverse | AT Protocol |
| Where your account lives | On a server you pick, or one you host | One account, which Bluesky calls a shared identity across the social internet |
| Timeline | Chronological, no algorithm or ads | Any feed you choose, from friends only to an algorithm that learns what you like |
| Moderation | Each server sets and enforces its own rules | Moderation lists and content filters you control |
| Source code | Free and open-source software | Open network with a public developer ecosystem |
| Getting started | Join mastodon.social or pick another server | Sign up in the browser or the iOS and Android apps |
Why developers pick Mastodon
Mastodon is the one you can run yourself. Its site says a self-hosted server can follow and be followed from any other Mastodon server and is under no one's control but yours. It is free and open-source, so you can read the code, change it and contribute back. Because it talks ActivityPub, one account reaches other fediverse apps too.
The cost is a little friction at the start. You choose a server first, and that server's rules shape your experience. There is no recommendation algorithm, so a quiet account stays quiet until you go and find people.
Why developers pick Bluesky
Bluesky feels closer to the old Twitter on day one. The home timeline can be any custom feed, and starter packs let someone bundle recommended accounts and feeds into a single link or QR code. Search for a starter pack about your stack and you can have a working timeline in minutes.
It is also a platform to build on. Bluesky calls itself "locked open" and lists third-party projects on the AT Protocol, including Graze for custom feeds and Tangled, a social git platform. If you like writing feed generators or bots, that is a real draw.
What about X and Threads?
X is still where many launches and arguments start, and its For You tab learns from what you like and reply to. Threads, built by the Instagram team, signs you in with Instagram and has an optional fediverse sharing setting that lets Mastodon replies show up in Threads. Neither has to be your main feed, but skipping X entirely means missing a lot of first-day announcements.
Rebuilding your tech feed with TechTwitter IO
The hard part of switching is not the app; it is finding the people again. TechTwitter IO, a free site, keeps a list of real tech accounts grouped by field, from AI labs and engineers to DevRel and indie hackers, each with a one-line note. The handles are X handles, so use the names as a checklist when you search Bluesky or Mastodon.
The same site publishes a free satirical daily paper about tech Twitter, with sections on launches, outages and feuds plus puzzles such as Connections and Jumble. It is satire: its footer says people, posts and quotes are parody or invented unless a post links to its source. Read it for the jokes and get real news elsewhere.
Which should you choose?
Choose Bluesky if you want a quick start and swappable feeds. Choose Mastodon if self-hosting, a chronological feed and the open fediverse matter more to you than reach. If your team already hangs out on one of them, go where they are.