AI Grammar Checker

AI Grammar Checker — Perfect Your Writing with 60+ AI Models

Check grammar across English, Spanish, German, French, and 30+ other languages. Catch punctuation errors, fix spelling slips, and clean up style instantly. Every correction comes with an explanation — powered by 60+ AI models. Free to start.

Check Grammar Free See Pricing

ZeroTwo AI grammar checker with 60+ AI models for writing improvement

60+ AI models, one grammar checker

Each AI catches different issues. Compare corrections to get the most thorough grammar check.

Compare models for writing, research, or coding.

GPT-5

Claude Sonnet 4.5

Gemini 3 Pro

Grok 4

Perplexity

DeepSeek R1

Mistral Large

Cohere Command A

Qwen 3

Llama 4 (Groq)

Kimi K2.5

Liquid LFM

Best AI for Every Writing Type

Different writing needs different grammar feedback. Here's which model to pick.

Writing Type	Best Model	Why
Grammar Correction	Claude / GPT-5	Accurate, explains rules
Academic Writing	Claude / Gemini	Formal tone, precise
Business Emails	GPT-5 / Claude	Professional, concise
Creative Writing	Claude / GPT-5	Preserves voice, subtle fixes
ESL / Non-Native	GPT-5 / Claude	Clear explanations, patient
Technical Docs	Claude / Gemini	Precise terminology

More than just grammar

From basic spelling to advanced style improvements, the AI grammar checker covers everything.

ZeroTwo AI grammar checker interface with model selector and correction tools

Grammar & Spelling

Catch every grammar mistake, spelling error, and punctuation issue. AI identifies errors and suggests corrections with explanations so you learn as you improve your writing.

Style & Tone Suggestions

Get feedback on writing style, tone consistency, and readability. AI suggests improvements to make your writing more professional, casual, academic, or persuasive.

Clarity & Conciseness

Eliminate wordy phrases, passive voice, and unclear sentences. AI rewrites awkward passages for maximum clarity and impact while preserving your meaning.

Advanced Proofreading

Go beyond basic grammar with advanced checks for subject-verb agreement, dangling modifiers, parallel structure, and consistency in tense and voice.

See all AI tools or try our AI rewriter.

How it works

Fix your writing in seconds. Just paste your text and AI checks everything.

Step 1

Choose your AI model

Select from 60+ AI models. Claude excels at nuanced grammar feedback, GPT-5 at comprehensive corrections, and Gemini at style suggestions.

Step 2

Paste your text

Paste any text — emails, essays, reports, blog posts, or messages. Specify if you want grammar-only fixes or full style improvements.

Step 3

Review and apply fixes

Get instant corrections with explanations. Accept suggestions, request alternatives, or switch models to compare feedback styles.

ZeroTwo AI grammar checker output showing corrected text with explanations

Free forever. Upgrade when ready.

Start checking grammar for free. Upgrade to Pro for unlimited corrections.

Compare all AI pricing or see why users call ZeroTwo the best ChatGPT alternative.

Free

$0/mo

-Access to popular AI models
-Limited grammar checks per day
-Basic grammar and spelling corrections
-Standard response speed
-No credit card required

Get Started Free

Pro

$29.99/mo

-All 60+ AI models (GPT-5, Claude, Gemini, Grok & more)
-Unlimited grammar checking
-Image generation (GPT Image, FLUX, Imagen, Stable Diffusion)
-Multi-agent deep research
-Advanced canvas for long-form editing
-Priority response speed
-Cancel anytime

Get Started

Frequently asked questions

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Start checking grammar with AI — for free

Join thousands of writers who use AI to perfect their grammar, style, and clarity. No credit card required.

Check Grammar Free