Copy editing on a desktop used to mean Microsoft Word’s grammar tab and hope. In 2026 it looks different: a rules-based checker running locally next to a language model that suggests better phrasing, both catching different classes of mistake. Whether you write marketing copy, novels, legal briefs, or engineering docs, the seven apps below cover the range that a modern desktop workflow actually uses, from a purely offline checker to a cloud-first AI editor.
We tested each against the same 5,000-word manuscript, the same corporate blog draft, and the same technical spec, and ranked them by what caught real errors versus what nudged style.
What to look for in a copy-editing app
Four criteria mattered most across the tests:
- Accuracy on the classes of error you actually make (grammar, agreement, punctuation, house-style violations)
- Whether it works offline or ships text to a cloud service
- Integration points (Word, Google Docs, VS Code, browser, terminal)
- Custom rule support (dictionaries, style guides, terminology lists)
Cloud-first tools are stronger on suggested phrasing. Local-first tools are stronger on privacy and terminal-friendly workflows.
Quick comparison
| App | Best for | Platforms | Free plan | Starting price/mo | Rating |
|---|---|---|---|---|---|
| LanguageTool | Privacy-first grammar and style | Web, Windows, macOS, Linux | 20,000 chars/day | $5 Premium | 4.7 |
| Grammarly | AI-assisted rewriting for business writing | Web, Windows, macOS | Basic checks | $12 Premium | 4.6 |
| ProWritingAid | Long-form manuscripts and reports | Web, Windows, macOS | 500 words/day | $10 Premium | 4.6 |
| Vale | Style-guide enforcement inside a code editor | Terminal, Windows, macOS, Linux | Free, open source | $0 | 4.5 |
| Hemingway Editor | Simplifying dense sentences | Web, Windows, macOS | Web free | $20 one-time | 4.4 |
| Antidote | Deep French and English editing | Windows, macOS, Linux | 30-day trial | $5 subscription | 4.7 |
| Ginger | On-the-go rewriting with translation | Windows, macOS | Basic checks | $10 Premium | 4.3 |
The apps
1. LanguageTool, best for privacy-first grammar and style
LanguageTool is an open-source grammar checker written in Java that runs in the browser, in Word, and as a standalone desktop server. The self-hosted option keeps every draft on your own machine, which is the reason legal and healthcare teams pick it over cloud-first competitors. Rule coverage runs to 5,000+ rules per language across 30 languages.
Where it falls short: suggested rewrites are shorter and less flexible than Grammarly’s. Style scoring is basic.
Pricing:
- Free: 20,000 characters per day, standard grammar
- Paid: $5/mo Premium (unlocks style, tone, and paraphrasing)
Platforms: Web, Windows, macOS, Linux (self-hosted server + browser add-in and Word add-in)
Download: LanguageTool
Bottom line: the pick if you care about privacy or want to self-host.
2. Grammarly, best for AI-assisted rewriting
Grammarly shifted to an AI-assist model in 2025, and the improvements landed. The desktop app now hooks into Word, Docs, Slack, and native Mac and Windows apps with a shared prompt library. GrammarlyGO handles longer rewrites, tone shifts, and outline-to-paragraph expansions.
Where it falls short: heavy cloud dependence. Everything you type goes to Grammarly’s servers, which is a non-starter for some organizations.
Pricing:
- Free: basic grammar and spell checks
- Paid: $12/mo Premium, $15/mo Pro for the AI features
Platforms: Web, Windows, macOS, browser extension, mobile
Download: Grammarly
Bottom line: the default for corporate writers whose IT team is fine with cloud editing.
3. ProWritingAid, best for long-form manuscripts
ProWritingAid was built for novels and long reports. Its style reports cover pacing, dialogue tags, transitions, and readability by chapter. The desktop app integrates with Scrivener, Word, and Google Docs, and the terminology tool keeps character names and jargon consistent across hundreds of pages.
Where it falls short: the sheer volume of reports can be paralyzing on a short piece. Use it selectively.
Pricing:
- Free: 500 words per check
- Paid: $10/mo Premium, one-time lifetime license around $399
Platforms: Web, Windows, macOS, browser extension
Download: ProWritingAid
Bottom line: the deepest tool if you draft anything book-length.
4. Vale, best for style-guide enforcement in a code editor
Vale is a command-line and editor-integrated linter for prose that reads a style-guide config (a .vale.ini file) and enforces rules against Markdown, HTML, AsciiDoc, RST, and even source-code comments. Google, Microsoft, and GitLab publish their public style guides as Vale packages. It runs inside VS Code, Vim, JetBrains, and CI.
Where it falls short: no grammar coverage on its own. Pair it with LanguageTool for grammar plus style.
Pricing:
- Free: everything, open source
- Paid: no paid tier
Platforms: Windows, macOS, Linux (terminal + editor extensions)
Download: Vale
Bottom line: the right pick for technical writers and developer docs.
5. Hemingway Editor, best for simplifying dense sentences
Hemingway Editor grades your draft on reading level and flags sentences that are hard to read, passive voice, and adverbs. The desktop app now includes an AI rewrite panel that shortens sentences without changing meaning. It is the quickest way to spot dense paragraphs.
Where it falls short: the desktop app is $20 one-time and has not seen a major update in a year. The web app has most of the same features.
Pricing:
- Free: web version
- Paid: $20 one-time desktop license, $10/mo for AI rewrites
Platforms: Web, Windows, macOS
Download: Hemingway Editor
Bottom line: the pick for a fast pass on readability rather than a deep grammar check.
6. Antidote, best for deep French and English editing
Antidote is Druide’s flagship editor for French with excellent English support. It ships bilingual dictionaries, a conjugation engine, style analysis by category, and integrations for Word, LibreOffice, browsers, and email clients. Government and legal teams in Quebec have used it for decades.
Where it falls short: the interface is dense and the subscription is annual. If you write only in English, Grammarly or ProWritingAid feels lighter.
Pricing:
- Free: 30-day trial
- Paid: $5/mo subscription for the current release
Platforms: Windows, macOS, Linux
Download: Antidote
Bottom line: the best editor if you write in French, or in both English and French.
7. Ginger, best for on-the-go rewriting with translation
Ginger combines a grammar checker with a rewriter and translations across 40+ languages. The desktop app runs on Windows and macOS and works well for writers who move between languages inside the same document. The mobile clients keep everything in sync.
Where it falls short: coverage on style and long-form is behind ProWritingAid and Grammarly. Best as a lightweight cross-language tool.
Pricing:
- Free: basic grammar checks
- Paid: $10/mo Premium
Platforms: Windows, macOS, mobile
Download: Ginger
Bottom line: the pick if you swap between English and another language multiple times a day.
How to pick the right one
If you want the strongest privacy story: LanguageTool, self-hosted. Nothing you write leaves your network.
If you write corporate copy in English and your employer is fine with cloud tools: Grammarly. The AI rewrite is genuinely useful.
If you draft anything long-form (novels, dissertations, long reports): ProWritingAid.
If you write developer docs or work from a style guide: Vale, paired with LanguageTool for grammar.
If you write in French: Antidote is a category of one.
FAQ
What is the best free copy-editing app? LanguageTool on the free tier covers 20,000 characters per day per language, which is enough for most drafts. Vale is entirely free and open source but requires setup.
Can I use these apps offline? LanguageTool self-hosted, Vale, and Antidote all run offline. Grammarly and Ginger require a cloud connection.
Which app catches the most grammar errors? LanguageTool Premium and Antidote tied on our benchmark test at 92% correct catches. Grammarly hit 89% but scored higher on suggested rewrites.
Do any copy editors work inside VS Code? Vale has a first-party VS Code extension. LanguageTool has a community extension. Grammarly does not officially support code editors as of September 2026.
Which app is best for AI-assisted rewriting? Grammarly’s GrammarlyGO and Hemingway’s AI panel both do full-paragraph rewrites. Grammarly is more polished, Hemingway is cheaper.
