G
GGrammar & Proofreading AI toolsFull list
Catch errors and tighten your writing.
9 tools8 with a free plan4 with an API1 open source
9 tools
GG
Freemium
G
AI writing assistant for grammar, tone, rewrites and AI-text detection
Grammar & ProofreadingFree plan
G
GG
Freemium
G
AI text detector with plagiarism checks and writing replay for educators
AI Detection & HumanizersFree planAPI
H
HReadability editor that flags wordy, unclear writing and offers AI fixes
From $8.33/mo
H
From $8.33/mo
H
Readability editor that flags wordy, unclear writing and offers AI fixes
Grammar & Proofreading
O
OAI content detection, plagiarism and fact checking for publishers and educators
Free, from $12.95/mo
O
Free, from $12.95/mo
O
AI content detection, plagiarism and fact checking for publishers and educators
AI Detection & HumanizersFree planAPI
W
WW
Free, from $4.89/mo
W
AI rewriting, summarizing and grammar assistant for everyday writers
Paraphrasing & RewritingFree plan
L
LL
Freemium
L
Grammar, spelling and style checker for 30+ languages, with AI rephrasing
Grammar & ProofreadingFree planAPIOpen source
P
PP
Freemium
P
Grammar checking, line editing and story critique for fiction writers
Grammar & ProofreadingFree plan
S
SS
Free
S
Free online text rewriter plus grammar, spelling and summary tools
Paraphrasing & RewritingFree plan
G
GG
Freemium
G
AI grammar, spelling and rephrasing help for English writers on any device
Grammar & ProofreadingFree planAPI
Grammar & Proofreading tools compared
From each vendor's own pages, re-checked every two months. Of 8 tools we checked, 3 of 5 that state a policy don't train AI on your content, and 2 hold SOC 2 or ISO 27001.
| Tool | AI rewrites | Tone adjustment | Plagiarism checker | Non-English checking | Word/Google Docs add-in | Browser extension | Custom style guide |
|---|---|---|---|---|---|---|---|
| G | — | ||||||
| HHemingway Editor | — | — | — | — | — | ||
| LLanguageTool | — | — | |||||
| PProWritingAid | — | — | |||||
| GGinger | — | — | — |
— means the vendor's site doesn't say.
How to choose grammar & proofreading tools
Most tools here catch typos. What sets them apart is what they do beyond that, and where they run.
- Main job. Grammarly, Ginger and LanguageTool are general grammar checkers. Hemingway Editor focuses on readability and flags wordy, unclear sentences. ProWritingAid is built for fiction authors, with line editing and story critique. Wordtune and Spinbot lean toward rewriting. GPTZero and Originality.ai detect AI text and plagiarism rather than correct it.
- Pricing model. Spinbot is free. Most others are freemium, including Wordtune (from $4.89/mo) and Originality.ai (from $12.95/mo). Hemingway Editor offers a free trial, then runs from $8.33/mo. GPTZero is paid only.
- Platform. Grammarly and Ginger cover web, desktop, iOS and Android. Spinbot is web only.
- Language, API and openness. LanguageTool checks 30+ languages and is open source. It, Ginger, GPTZero and Originality.ai offer APIs.
Frequently asked questions
Are there free grammar checkers?
Spinbot is free. Grammarly, LanguageTool, Ginger, ProWritingAid, Wordtune and Originality.ai are freemium, so each has a free tier with paid upgrades. Hemingway Editor offers a free trial.
How much do these tools cost?
Among the listed starting prices, Wordtune is the lowest at $4.89/mo, Hemingway Editor starts at $8.33/mo and Originality.ai at $12.95/mo. GPTZero is paid only. Other prices aren't listed here, so check each vendor's site.
What should I look for in a proofreading tool?
Start with what you need: grammar fixes, readability (Hemingway Editor), fiction editing (ProWritingAid), or AI and plagiarism detection (GPTZero, Originality.ai). Then check that it runs on your devices, supports your languages (LanguageTool covers 30+), and has an API if you need one.
What are alternatives to Grammarly?
LanguageTool is an open-source, multilingual option with an API. Ginger covers browser, desktop and mobile. ProWritingAid suits fiction writers, and Wordtune focuses on rewriting and summarizing.