I've been posting to both Bluesky and Mastodon for about two years now, often the same content to both, and people keep asking me which one is “better” to schedule for. That's the wrong question. They're built on different ideas, they behave differently, and the scheduling setup for each has its own quirks. Here is what actually differs once you stop reading the marketing and start posting.
They're both open, but open in different ways
Both belong to what people call the open social web, meaning no single company owns the whole thing. But the architecture is different. Mastodon is a federation of independent servers, called instances, that talk to each other over a protocol called ActivityPub. Bluesky runs on its own protocol (the AT Protocol) and, in practice, most people are on one big server run by Bluesky itself, with the option to move elsewhere later.
For posting, that distinction matters less than you'd expect. For culture and reach, it matters a lot, and I'll get to that.
The practical upshot is that “Mastodon” isn't one place you log into, it's thousands of small towns that happen to share a postal service. Bluesky, for now, feels more like one big city with the door propped open. Neither is better. They just ask slightly different things of you when you set up, and knowing that going in saves a lot of confusion later.
Connecting an account: app passwords vs tokens
This is where the two genuinely differ in setup, so it's worth being clear.
Bluesky uses app passwords
With Bluesky you generate an app password inside your account settings, a separate credential from your real login, and you hand that to your scheduler. It takes about thirty seconds. You can revoke it any time without changing your main password, which is exactly how it should work. Our Bluesky scheduling uses this app password flow, so you never give us your actual login.
Mastodon uses per-instance tokens
Mastodon is a touch more involved because every instance is its own server. You authorise the app against your specific instance (say, mastodon.social or your niche community server) and it gets an access token scoped to that server. The flow is standard OAuth, so it's familiar, but you do need to know which instance you're on. If you move instances, you reconnect. Our Mastodon scheduling handles the per-instance authorisation for you, but it's good to understand why it asks for your instance address first.
What posting actually feels like on each
Once connected, both publish text posts and images reliably. A few differences I've hit in practice:
- Character limits differ. Bluesky gives you 300 characters. Mastodon defaults to 500, but each instance can change that, so check yours.
- Link previews behave differently. Bluesky generates rich cards from a URL fairly aggressively. On Mastodon it's more restrained, and some instances strip or delay previews.
- Alt text is close to mandatory on Mastodon culturally. The community will gently (or not so gently) remind you. Add it on both, honestly, but on Mastodon it's table stakes.
- Hashtags do real work on Mastodon because there's no algorithmic feed surfacing posts for you. On Bluesky they help less; the feeds and follows do more of the lifting.
The culture is the real difference
Bluesky feels closer to old Twitter: quick takes, quote posts flying around, custom feeds you can subscribe to, a faster pace. If you want reach and replies, it tends to move faster.
Mastodon is slower and more deliberate, and that's a feature, not a bug. There's no engagement-maximising algorithm, so a post lives or dies on whether your followers and the people who see your hashtags actually care. Self-promotion that works fine on Bluesky can land badly on a small Mastodon instance. I post the same core message to both, but I soften the salesy edge for Mastodon and lean into being useful.
So which should you schedule for?
Both, if your audience is on both. They reward different things, and cross-posting the identical text to each is the lazy mistake. My actual workflow: write the core post once, trim it to 300 for Bluesky, expand and add alt text and a hashtag or two for Mastodon, then queue both. The whole point of a scheduler is that this takes minutes, not a daily scramble. If you're juggling these alongside other platforms, our guide on managing multiple social media accounts covers how to keep the tone right per network without doing everything twice.
A quick starting plan
If you're setting up today: connect Bluesky with an app password, connect Mastodon by authorising your instance, and schedule two or three posts to each for the coming week so you can compare how they land. Once you've got a feel for it, the basics in how to schedule social media posts apply to both. Don't overthink which network “wins.” They're different rooms with different vibes, and the open social web is more fun when you treat them that way.