Find your English grammar bugs. Patch them fast.
GrammarPatch finds the tense and preposition mistakes you keep repeating and turns them into short, personalized practice sessions.
For intermediate English learners (A2–C1). Not a course, not a grammar checker, not a chatbot — a repair shop for the mistakes you keep making.
The problem
You know the rule, but you still make the mistake.
Some errors slip out again and again — in emails, interviews, and meetings. GrammarPatch spots the ones that are actually yours.
How it works
GrammarPatch finds your recurring mistakes and helps you fix the pattern.
Four steps, a few minutes at a time. No lectures — just the clue you were missing and enough practice to make it stick.
Scan your grammar
A short Patch Scan surfaces the tense and preposition bugs you repeat most.
See your Patch Map
Your Grammar Bugs, laid out clearly — with the rule and the clue behind each one.
Complete Quick Patches
Short, focused practice built around your specific mistakes, not a generic course.
Review until patched
Spaced Patch Reviews bring each bug back until it's genuinely fixed.
Where it helps
For the moments your English has to be right.
Built for busy professionals, job candidates, and exam takers working under real-world pressure.
Pricing
Start free. Go further when you're ready.
Try GrammarPatch at no cost, then unlock unlimited practice with a 7-day free trial.
Free
Enough to find your first Grammar Bugs.
- 1 Patch Scan
- 3 Quick Patches
- 2 Real Use submissions
Monthly
Unlimited repair for the mistakes you keep making.
- Unlimited Patch Scans
- Unlimited Quick Patches & Reviews
- Unlimited Real Use submissions
Yearly
The same, for about half the monthly price.
- Everything in Monthly
- Save 50% vs. monthly
- 7-day free trial
Subscriptions are billed through the App Store. Cancel anytime before your trial ends and you won't be charged.
Patch your first Grammar Bug today.
Find the mistakes you keep repeating — and finally fix the pattern behind them.