Grammar Checker
Catch grammar, spelling, and punctuation errors with in-browser pattern matching — homophones, run-ons, misplaced commas. Writers proofread a 1,000-word draft in seconds — runs locally, free to start with fair limits.
How to Use the Grammar Checker
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Frequently Asked Questions
What errors does Grammar Checker actually catch?
Grammar slips, misspellings, punctuation faults, homophone swaps (their/there/they're), and run-on sentences. A 1,000-word draft typically surfaces 15–30 flags in one pass — accept the clear wins, ignore stylistic suggestions that fight your voice.
Is my text uploaded when checking grammar?
No — the rule-based check runs entirely in your browser and nothing is sent anywhere. Only the optional AI Fix button sends the flagged sentences to the AI API (1 credit per fix); the plain check stays free, local, and offline-capable.
How do Pro limits work for Grammar Checker?
The rule-based check is free and local with no credits and no per-use cap. The AI Fix button costs 1 credit per use — signed-in free plans include a one-time 5-credit trial, Pro gets 200 monthly, anonymous requests return 401. Exporting the corrected .txt counts as one Pro download (signed-in free: 2 a day).
Can it replace a human proofreader?
For everyday text yes, for high-stakes text no: it catches mechanical errors reliably but misses tone, logic, and factual mistakes. Ship blogs with tool-only proofing; give contracts, theses, and job applications one human read after the tool pass.
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Last updated October 2026