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Small tools for people who post everywhere

Nothing here is uploaded, stored, or tied to an account or an email address.

  • Character counter

    Paste one caption and see it counted against all nine platforms at once, the way each network actually counts, not the way JavaScript does.

    Open

  • Post preview

    See one caption the way each network will actually show it, including exactly where every platform cuts it off behind a “more” link.

    Open

  • Best time to post

    Drop in your own analytics export and get a 7×24 heatmap of when your posts actually land, not a global average that tells everyone the same hour.

    Open

  • Bold and italic text

    Unicode bold, italic and monospace for networks with no formatting button, with a straight answer about what it costs you.

    Open

  • UTM link builder

    Paste one link and get a tagged URL for every network at once, so you can finally tell which platform sent the clicks.

    Open

  • Hashtag sets

    Save the hashtag blocks you reuse, name them, and rotate between them instead of pasting the same twenty tags every time.

    Open

  • Video specs checker

    Drop in a video and see which formats it already fits (Reels, Shorts, TikTok, Stories or the feed) before you find out the hard way.

    Open

Or stop switching between nine tabs

Synapse writes your post once and publishes it to X, LinkedIn, Bluesky, Instagram, Facebook, Threads, TikTok, YouTube and Pinterest, with each network’s rules already applied, on a schedule you set.

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