16 tools · no sign up

Tools for X

Count characters the way X does, split threads, find the best time to post, size images and check links before you share them. Every tool runs in your browser, so nothing you type ever leaves your device.

By Jonas Ben, founder of Kairo Post · Updated 30 September 2026

06 tools

Write

Get every post, thread and bio right before it goes out.

04 tools

Plan

Decide when to post, how often and whether it is working.

03 tools

Design

Images, cards and previews that look right on X.

03 tools

Build

For developers wiring X and webhooks into their own tools.

Private by design

The tools run on your device with no uploads, no AI calls and no connection to X. Close the tab and nothing remains.

Built on X's rules

Character weights, link lengths, image sizes and limits follow X's own documentation, with links to the source on each page.

Kept current

Each page shows who wrote it and when it last changed. When X changes a rule, the tool changes with it.

When you are ready to stop doing it by hand

Kairo Post counts, splits, designs, schedules and checks every post for you, across every account, in each account's own voice. You approve what goes out and see the price of every action first.

See all features Use it from your AI assistant Plans and pricing

Character counter and thread splitterComposer and publishing
Best time planner and calendarScheduling
Phrase checker and hook graderAI writing and voice
Quote cards and image sizesImages and media
Engagement rate and UTM linksAnalytics
Webhook verifier and API costsAPI and webhooks

About the tools

Do the tools cost anything?

No. There is no sign up, no trial and no limit on how often you use them. They run in your browser, so they cost us nothing to run.

Is what I type stored anywhere?

No. Every tool runs entirely on your device. Your text, images and numbers are never uploaded, and the tools make no calls to AI services or to X.

Do the tools need an X account?

No. None of them connect to X. They follow X's published rules, such as how characters are counted and which image sizes to use, so you can check your work before you post.

Who makes these tools?

Jonas Ben, the founder of Kairo Post. Each tool page shows when it was last updated, and we update them when X changes its rules.

How do these relate to Kairo Post?

Each tool does one job by hand. Kairo Post does the same jobs for you inside a full publishing workspace: it counts, splits, schedules, designs and checks posts automatically, with your approval before anything goes out.

Can I suggest a tool?

Yes. Write to support@kairopost.com with what you need and why. We build the ones that many people ask for.

Post at the right moment.
Starting today.

Connect an account, describe your voice and let Kairo Post do the legwork.

Get started See pricing