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Tech riderRev. 11 Oct 2026

Instant Grammar

Ch 825.9of 88Grammar checkers
  1. 1Runs onWindows
  2. 2CostsFree plan
  3. 3Desktop appYes
  4. 4Style suggestionsYes
4 lines stated Written from the maker's own pages: instant-grammar.com
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The Instant Grammar homepage

Overview

Instant Grammar is ranked #82 of 88 in grammar checkers on Specifiction. It runs on Windows. There is a free plan.

Instant Grammar plans and pricing

All plans
Free Free Windows 10 or later instant-grammar.com · 21 Sept 2026
Instant Grammar Free Free download · no subscription · requires your own OpenAI API key; OpenAI usage billed separately instant-grammar.com · 11 Oct 2026

Compared on grammar checkers

Free plan
Yesinstant-grammar.com
Desktop app
Yesinstant-grammar.com
Style suggestions
Yesinstant-grammar.com

Facts

What it does
Instant Grammar is an open source AI-powered grammar checker for Windows applications that uses an OpenAI API key.instant-grammar.com · 11 Oct 2026
Corrections
It offers grammar, spelling, and style suggestions, with corrections applied automatically after text is selected.instant-grammar.com · 11 Oct 2026
App compatibility
The site says it works across Windows applications, including Word, browsers, and email clients.instant-grammar.com · 11 Oct 2026
Open source
The maker describes the application as 100% open source and links to its GitHub repository.instant-grammar.com · 11 Oct 2026
Usage costs
No subscription is required; users provide an OpenAI API key and pay OpenAI for usage.instant-grammar.com · 11 Oct 2026
Supported version
The download page lists version 1.0.1 for Windows 10/11 and requires Windows 10 or later with 35 MB of free space.instant-grammar.com · 11 Oct 2026
Integrations
The app uses OpenAI's API, and its privacy policy says communication with OpenAI happens directly from the user's device to OpenAI.instant-grammar.com · 11 Oct 2026
Text handling
The privacy policy says personal text is not stored or transmitted to the maker's servers, while the app sends text to OpenAI for grammar checking.instant-grammar.com · 11 Oct 2026
Local key storage
The privacy policy says the OpenAI API key is stored locally and never sent to the maker's servers.instant-grammar.com · 11 Oct 2026
Analytics and crash reports
The privacy policy says the app collects anonymous usage analytics and crash reports only if users opt in.instant-grammar.com · 11 Oct 2026
Support
The maker lists support by email at [email protected].instant-grammar.com · 11 Oct 2026
Terms
The terms say users are responsible for providing their OpenAI API key and paying associated OpenAI usage costs.instant-grammar.com · 11 Oct 2026
Company
The site copyright notice names Accelio Limited.instant-grammar.com · 11 Oct 2026

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All accessCh 01 MerciApp Free planFree trialAndroid from €12/mo9.1 All accessCh 02 LanguageTool Free planBrowseriOS Free to start8.9 All accessCh 03 Microsoft Editor Free trialBrowserMac 8.8 All accessCh 04 Sapling Free planFree trialAPI from $5/mo8.8 All accessCh 05 iGrammar Free planFree trialAndroid from $10/mo8.7 All accessCh 06 Grammarly Free planAndroidiOS from $12/mo8.6

Where it ranks on Specifiction

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Sources