One video, every feed, on time.

Upload once, write a caption for each platform, pick the time. Onslot posts it to Instagram, YouTube Shorts and TikTok for you.

Join the waitlist

Invite-only beta. Free while it lasts; paid plans come later.

One file, three posts, one slot in your calendar.

For people who post the same thing in three places

Creators

You cut one vertical video and post it as a Reel, a Short and a TikTok. Onslot does the three uploads at the time your audience is awake, and you get your evening back.

Small businesses

A café, a studio, a shop. You plan a week of posts on Sunday, see them on a calendar, and stop opening three apps every day to remember what goes out next.

How it works

Connect your accounts

Sign in to Instagram, YouTube and TikTok through each platform's own login. Onslot never sees your passwords.
Upload once

Drop in a video, a photo or up to ten items for a carousel. Write one caption, or a different one per platform, plus an optional first comment.
Pick the platforms and the time

Choose where it goes and when. It shows up on your calendar, and Onslot publishes it at that minute and tells you how it went.

What's in it

New flavour drops Friday. Pistachio and sour cherry, only 40 tubs. Link in bio.

First comment: Pickup from 10:00 at Carrer de Verdi 12.

A caption per platform: Hashtags for TikTok, a title for YouTube, a longer story for Instagram. Same post, written for each place.
First comments: Add the comment that goes up right after the post, for links, credits or the hashtags you keep out of the caption.
A calendar: Every scheduled and published post on one week view. Move a post by changing its time.
Previews before it goes out: The composer shows how the post will look on each platform and warns you about anything a platform would reject.
Reels, photos, carousels, Stories: On Instagram, plus Shorts on YouTube and videos on TikTok.
Schedule from Claude: Onslot has an MCP server, so you can ask Claude to draft and schedule posts for you, and it uses the same rules as the app.

What it can't do yet

Each platform decides what an app is allowed to do with its API. These are the gaps today, so you don't find them out on posting day.

TikTok: Your video arrives as a draft in your TikTok inbox. You open TikTok, add a sound if you want one, and tap post. TikTok only allows fully automatic posting for apps it has audited.
Instagram: Stories post as plain photos or videos. The API can't add stickers, links, polls or music, so add those in the app if you need them.
YouTube: Until Google finishes auditing Onslot's access to the YouTube API, Shorts upload as private videos. You switch them to public in YouTube Studio.

Get an invite

We're letting people in a few at a time. Leave your email and we'll write when there's a spot for you. No newsletter, no other mail.