Derive Growth Lab
Publish one video to every account you run.
Derive Growth Lab is the web app our team and the creators we work with use to publish short-form video. Upload a finished clip, write the caption once, tick the accounts it should go to, and post — with each platform's own sharing options set deliberately, on the screen, before anything is uploaded.
How it works
Three screens, in order. These are real screenshots of the product, not mock-ups.
Choose the video and where it goes
Upload a finished video or pick one already in your library. Growth Lab reads its real dimensions, duration and size, then shows every account you have connected. Tick the ones this video should go to. One caption is written once and adapted per platform.
Set that platform's own sharing options
Each platform gets its own section, showing the creator you are about to post as. For TikTok you choose who can view the video, which interactions are allowed, and whether the video is commercial content — every one of them an explicit choice, with nothing selected on your behalf.
Confirm and post
You agree to TikTok's Music Usage Confirmation immediately above the button, then post. Nothing is uploaded to any platform until that button is pressed. The result panel reports each platform separately — what was posted, at what audience, and what to do about anything that failed.
Platforms
You connect your own accounts. Growth Lab never posts to an account you have not connected yourself, and disconnecting one stops it immediately.
Reels published through the official Instagram Graph API, with per-account tokens the user grants and can revoke.
TikTok
Connected with Login Kit and published with the Content Posting API's Direct Post, using the audience and interaction settings chosen on the sharing screen.
YouTube
Shorts uploaded through the YouTube Data API with the visibility chosen at post time.
How we use the TikTok Content Posting API
Stated plainly, because it is the part people most want to know about.
- You connect your own account. TikTok's Login Kit runs in TikTok's own window. We store the resulting token against your Growth Lab user and nothing else.
- Audience is always your explicit choice. The "Who can view this video" dropdown opens with nothing selected — we never pre-fill it, and the options offered are the ones TikTok reports for your account.
- Comment, Duet and Stitch are off until you turn them on, and anything you have disabled in your own TikTok settings cannot be enabled from our screen.
- Commercial content is disclosed before posting — your own brand or a paid partnership — and the declaration is sent with the post.
- Music Usage Confirmation sits directly above the Post button, and posting is the act of agreeing to it.
- Nothing reaches TikTok until you press Post. No draft, no upload, no background publishing.