How Caption Spark works
You bring the idea, Caption Spark does the wording. It takes about as long as reading this sentence.
Describe the post
Write what the post is about in plain words, up to 600 characters. A product drop, a behind-the-scenes clip, a sale ending Sunday.
Pick app and tone
Choose Instagram, TikTok, X, LinkedIn, Threads or Facebook, then Friendly, Pro, Bold or Funny.
Copy and post
Pick one of the three captions, add the hashtag set below it, and paste it into your post.
Written by AI, checked by code
The captions are written by AI. Before you see them, code checks the length, the hashtags and the emoji rules for the app you chose, and drops anything that breaks them.
Limits per app
Caption plus hashtags always fit: 2,200 characters on Instagram and TikTok, 280 on X, 500 on Threads, 3,000 on LinkedIn and 2,000 on Facebook. The hashtags come as their own list, so you can trim or reorder them.
When the AI is busy
If the AI writer is busy, you still get a complete set built from our templates, with a short note saying so. Try again a little later for fresh AI versions.
Keep writing captions for free
A free BABAV account keeps Caption Spark going every day and opens the other free BABAV tools with the same sign-in.
Start free