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Subtitles are not the hard part. The words are.
Video tools clean up what you already filmed. Robyn deals with the blank field underneath it: the caption, the hook, and the reason someone stops scrolling.
Robyn is a Captions AI alternative for the writing side of social media rather than the video-editing side. Captions apps burn subtitles onto your videos; Robyn learns your voice and writes the caption, the hook, and the carousel that go with the post, then schedules and auto-publishes it to six platforms. Free on iOS and Android.
- ✓Writes captions in your voice, not a generic AI tone
- ✓Turns a photo, a link, or one sentence into a finished post
- ✓Schedules and auto-publishes to 6 platforms on Pro
From a rough idea to a posted caption.
Robyn learns how you write
It reads your past posts and builds a voice profile: cadence, vocabulary, the phrases you actually use.
Hand it anything
A sentence, a photo from your camera roll, or a link. Robyn writes the caption around it, sized for the platform you picked.
Approve and it ships
Edit if you want, then schedule. On Pro, Robyn publishes automatically at the right time.
Built for the writing, honestly.
A voice profile, not a prompt
Robyn keeps a persistent model of how you write, so you are not re-explaining your brand to a blank chat box every single time.
Anti-generic guardrails
Robyn checks its own drafts against known AI tells and rewrites anything that reads machine-made before you ever see it.
Per-platform, natively
One idea becomes a punchy X post, a story-led Instagram caption, and a professional LinkedIn post, each written for that feed.
It also publishes
Captions are only useful once they are live. Robyn queues your week and, on Pro, posts to six platforms for you.
Different jobs, honestly compared.
| What you need | Robyn | Video captioning app |
|---|---|---|
| Writes the post caption in your voice | ✓ | ✕ |
| Burns subtitles onto a video | ✕ | ✓ |
| Designs multi-slide carousels | ✓ | ✕ |
| Plans your posting week | ✓ | ✕ |
| Auto-publishes to your accounts | ✓ | Varies |
| Edits or generates video | ✕ | ✓ |
These tools solve different problems and many people use both. If your job is subtitling video, a captioning app is the right tool; Robyn is for the writing and publishing around it.
Frequently asked questions
Is Robyn an alternative to Captions AI?
For the writing side, yes. Robyn writes the caption, the hook, and the carousel in your voice, then schedules and auto-publishes them. It does not edit video or burn subtitles onto footage, so if that is what you need, a video captioning app is still the right tool.
Does Robyn add subtitles to videos?
No. Robyn writes the text of the post, not on-screen subtitles. Many people use a captioning app for the video itself and Robyn for the caption, scheduling, and publishing.
Can Robyn write captions for reels and TikToks?
Yes. Robyn writes short, hook-first captions built for TikTok, Reels, and Shorts, in your own tone, and can schedule and auto-publish them on Pro.
Will the captions sound like AI?
That is the thing Robyn is built to avoid. It drafts against a profile of your own writing and then screens the result for machine-sounding phrasing before showing it to you.
Is Robyn free?
Yes, free to download and use on iOS and Android. Pro unlocks unlimited captions, Auto-pilot, and auto-publishing, with a 7-day free trial.
Can I use a photo instead of typing an idea?
Yes. Send Robyn a photo and it writes the caption around it, using your voice profile and your brand context.
Which platforms does Robyn publish to?
Instagram, TikTok, YouTube, Facebook, LinkedIn, and X. Connect them once on Pro and Robyn posts at the scheduled time.
Do I need to write prompts?
No. There is no prompt engineering. You give Robyn an idea in plain words, or let Auto-pilot decide what to post, and edit whatever comes back.
Robyn does more than this.
Your video is ready.
Now the caption is too.
Free on iOS and Android. Start your 7-day Pro trial today.