Free Tool
Free X Sentence Checker
Check grammar and spelling for your X/Twitter posts. Fix grammar mistakes, verb forms, and more - free, no signup required.
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Free grammar checker for X/Twitter posts. No signup required.
1,300+ people use XJumper to grow on X
The desktop Agent replies to Build in Public posts for you every day, from your own browser.
Try XJumperHow It Works
Enter or paste your text
Type or paste the sentence or short paragraph you want to check. Works for tweets, replies, and captions.
Click Check
Our AI analyzes your text for grammar, spelling, and style issues.
Review and fix
See each issue with suggested fixes. Copy the corrected text to use in your post.
What we check
Grammar fixes
Detects missing infinitives, wrong verb forms, and more
Clear suggestions
Each issue comes with a specific fix you can apply
No signup
Free to use without registration or login
XJumper Extension - Work Directly on X.com
6 features appear exactly where you need them on X.com - no context switching.
One-Click Authorization
What it does
- Sync your X account to XJumper with a single click
- No passwords stored - secure cookie sync only
- Access all x-jumper.com features seamlessly
Why it matters
- Auto Reply, Auto Follow, and analytics work instantly after sync
- No re-login when switching devices or browsers
Vibe Writing & Optimize
What it does
- Voice-to-text: turn your voice into tweets directly on X.com
- Translate to 15+ output languages before posting
- Rewrite draft text into polished, professional content in your chosen language
Best for
- Commuters and multitaskers who think faster by talking
- Reaching global audiences, repurposing content across languages
- Tightening last-minute drafts before posting
AI Reply
What it does
- AI Reply button appears when composing a reply on X
- Get context-aware suggestions based on the original tweet
Why it matters
- No copy-paste from another tab - everything in-context
- Hit trending threads early without sounding generic
Follow Status & Quick-Follow
Follow Status
- Avatars show colored borders: green = following, yellow = pending, red = not following, gray = unknown
- Spot who you've already followed in lists and threads at a glance
Quick-Follow
- Follow or unfollow with one click from tweets and user lists - no need to open profiles
- Scale follow/unfollow when building an audience, prune inactive accounts efficiently
Activity Overview
What it does
- Clear chart on your profile page showing posts and replies over time
Best for
- Spot your best posting windows
- See reply volume and gaps in content cadence
Tweet Value
What it does
- Estimated ad value (USD) next to views on every tweet
- Based on impressions and engagement (likes, replies, retweets)
Why it matters
- Price sponsored posts and negotiate deals
- Know which content performs best
What XJumper is actually for
This tool is a one-off. Growing on X is a daily job.
XJumper's desktop Agent reads the Build in Public community on X every day, picks posts from builders worth talking to, and replies in your voice from your own browser. You keep shipping; it keeps showing up.
- Up to 50 replies a day, never the same post or author twice in a month
- Runs in a real browser on your own Mac or PC, signed in as you
- Every reply is written for that one post and listed in your Console
Day 38 of building my invoice tool. Cut onboarding from 6 steps to 3 and trial-to-paid went from 4% to 7% this week. Next up: killing the pricing toggle nobody uses.
Halving onboarding and seeing paid conversion move that much says the friction was real. Which step did you drop first?
- 09:14@devmarco Pricing page v3 is live, finally happy with itReplied
- 10:52@tinylaunch First $100 MRR after 5 months of nights and weekendsReplied, followed
- 13:30@sam_codes Rewrote my auth flow over the weekend and deleted 900 linesQueued
Frequently Asked Questions
Write better posts on X
Use XJumper's AI tools to craft perfect posts, grow your audience, and engage smarter.