Write X posts in your voice.
Drop in the photo, video, or thread image you’re about to post. Captiv reads what’s actually in it and writes three post options, ready to publish in about ten seconds.
Free to start · no login · photos, videos & threads
An AI X (Twitter) post generator that sounds like you.
Captiv is an AI X (Twitter) post generator: you upload a finished photo, video, or thread image, and it looks at what’s actually there, then writes three post options — a hook angle, a story angle, and a value angle — each with a tuned set of hashtags and a one-line why, in about ten seconds. You edit inline and copy the one you like. Captiv never posts for you.
Words are how X finds your post.
X’s own engineering team says the For You algorithm has to distill roughly 500 million posts a day down to the handful that reach a timeline. It ranks candidates by turning your post’s content and each reader’s interests into numerical embeddings, then measuring how similar the two are.
About half of those candidates come from the in-network search index, and X’s hashtag docs are just as blunt: a # before a keyword categorizes your post so it shows more easily in search, and on a public account anyone searching that hashtag may find it. Captiv writes clear, on-topic posts and a tight set of hashtags so the words you publish match the way X actually reads them.
Three steps. About ten seconds.
No prompt-wrangling — Captiv works from the post you already made.
Drop in your post
Upload the photo, video, or thread image you’re about to publish on X. No login needed for your first three.
Captiv reads it
The AI looks at what’s actually in your media and the context you give it, then tunes for X — not a generic template.
Get 3 posts + hashtags
Three angles land in about ten seconds, each with a tuned hashtag set and a one-line why. Edit inline and copy.
Posts that sound like you wrote them.
Hook-first
Every option opens with a line built to stop the scroll on a fast-moving timeline.
Smart hashtag mix
A tuned, tight set per post — in line with X’s own no-more-than-2 best practice, not a wall of tags.
Sounds like you
On paid plans, Captiv learns your voice from the posts you keep and edit so drafts read like you.
Formats supported
Photos on every plan; video and thread-image analysis on Pro and Studio.
Three angles
A hook, a story, and a value take on the same post — pick the one that fits the moment.
Ten-second speed
Three ready-to-post options in about ten seconds, so posting stops being the bottleneck.
X posts, answered.
Is the X post generator free?
Yes. You get 3 posts with no login, then 5 a month free with an account. Pro is $15/mo and Studio is $35/mo for higher limits and more features.
How does the X caption generator work?
Upload a finished photo, video, or thread image. Captiv looks at what’s actually in it, then writes three post options — hook, story, and value — each with hashtags and a one-line why, in about ten seconds.
How many hashtags should I put on an X post?
X recommends no more than 2 hashtags per post as best practice. Captiv gives each option a tuned, tight set rather than stuffing tags.
Can it write posts in my own voice?
On paid plans, yes. Captiv learns your voice from the posts you keep and edit so drafts sound like you. The free plan uses a clean, platform-native X voice.
What formats can it read — photos, video, threads?
Photos work on every plan. Video and thread-image analysis are included on Pro and Studio.
Your next post,
written in ten seconds.
Drop in your photo, video, or thread and get three X posts in your voice — hook, story, and value.
Generate my caption — freeFree to start · no login · 3 posts before you sign up