The Mastodon scheduler that plans, writes and posts for your clients on any server.

Why Mastodon is worth it for brands and agencies

Mastodon is a free, open-source social network made of thousands of independent servers that talk to each other through the ActivityPub protocol, the backbone of the fediverse. FediDB counted about 976,000 monthly active users on 8,750 Mastodon servers in September 2026. That is small next to Instagram, but the audience skews toward tech, science, open source, journalism and public institutions.

Two things make it different. There are no ads and no ranking algorithm: the home feed is chronological, so every follower sees every post in order. And nobody can throttle the reach you built. For a client that sells to developers, researchers or a privacy-minded crowd, a steady Mastodon presence is an owned audience that costs little to keep.

Choosing a Mastodon server for a client

Every Mastodon account lives on a server, also called an instance. The server sets the rules, the moderation and the post length. mastodon.social is the largest general server. Topic servers such as infosec.exchange or fosstodon.org put a brand next to its niche, and a client can also run its own server on its own domain.

A few checks help. Read the server's rules, since some do not allow commercial accounts. Check the character limit: 500 is the default, but some servers allow far more. Then add a link to the client's website on the profile, with a matching rel="me" link on the site, so Mastodon shows it as verified. SocialScheduler connects to any server and reads its limit when you connect.

Hashtags, alt text and content warnings

With no algorithm, hashtags do the work of discovery. People follow hashtags, and search on most servers leans on them. So each post gets one to three specific hashtags at the end, in CamelCase (#SpecialtyCoffee, not #specialtycoffee), which screen readers can read out word by word.

Alt text is expected. Many people on Mastodon will not boost an image without a description, and servers allow up to 1,500 characters per image. SocialScheduler writes the alt text from what is in the image and any text on it. Content warnings are a courtesy for topics such as politics, food photos or spoilers, depending on the server's culture. Check the norms of the client's server before posting.

What an agency week looks like

Each client has a brief: voice, offers, topics to avoid, links. On Sunday the AI plans the client's week across every network they use and writes a separate Mastodon version of each idea: plain, useful, in the client's voice, without engagement bait.

Then someone says yes. Your team approves in the app, or the client gets an email link to the week and approves, comments or asks for a change without a login. Clients you trust can run on autopilot. On Monday each client gets a report under your agency's name, with followers, favorites, replies and boosts.

• Sunday: the week is planned and drafted
• Review: your team or the client approves from a link
• During the week: posts go out at each client's best hours
• Monday: a report under your agency's name

The best time to post on Mastodon

There is no large public study of Mastodon posting times as of September 2026, unlike Instagram or Threads. The reason is structural: there is no central company collecting the data. Much of the active audience is in Europe and North America, so weekday mornings in Europe, which overlap with early US hours, are a common starting point.

The better answer is the client's own followers. Because the feed is chronological, a post is seen mostly by people who open Mastodon in the hours after it goes out. SocialScheduler looks at when each client's audience is active and how past posts did on favorites and boosts, and schedules each post for that client's best hour. You can move any post.

How Mastodon scheduling works, and the free option

Mastodon has supported scheduled posts in its API since 2019. A post can be set for any time at least 5 minutes ahead, but the official web and mobile apps have no button for it. Free apps such as Tusky, Fedilab and Phanpy use that API, which is enough for one person with one account.

SocialScheduler connects through the server's own OAuth login, so it never sees the password. It registers itself on the server the first time anyone connects from it, keeps posts in its own calendar and publishes at the chosen time. The free plan covers one client with up to 3 connected accounts and 20 AI credits a month; publishing never costs credits. Business is $49 a month for 5 clients and Agency is $149 a month for 15, with 20% off yearly.