The Chrome Web Store is full of AI writing extensions. Most of them promise to "make you a better writer" but actually do very different things. Picking the wrong one means paying for features you don't need — or missing the one feature you actually do.
We tested the most popular AI writing Chrome extensions in 2025 and ranked them honestly. Here's what each tool is actually good at, and who should use it.
Quick Comparison
| Extension | Primary Use | Free Plan | Price |
|---|---|---|---|
| NativeProse Our Pick | Sound like a native English speaker | 10/day | $9/mo |
| Grammarly | Grammar & spell check | Yes (basic) | $12/mo |
| Wordtune | Sentence rewrites | 10/day | $13.99/mo |
| Compose AI | Email autocomplete | Yes | $9.99/mo |
| Jasper | Marketing & long-form content | Trial only | $39/mo |
1. NativeProse — Best for Non-Native English Speakers
NativeProse does one thing better than any other extension: it makes your English sound like it was written by a native speaker. Not just grammatically correct — actually natural, fluent, and idiomatic.
The extension works in any text field across any website. Select your text, choose a mode, and NativeProse rewrites it. Modes include Native (casual or formal), Academic, Professional, Simplify, and Translate (write in your first language, get natural English output).
This is fundamentally different from Grammarly. Grammarly highlights errors and suggests fixes. NativeProse rewrites the whole sentence from scratch, choosing the phrasing a native speaker would actually use. If you've ever felt your writing is "technically correct but still sounds foreign," that's the problem NativeProse solves.
Where it works: Gmail, Outlook, Slack, LinkedIn, Twitter/X, Google Docs, Notion, and any other browser text field.
- Output sounds genuinely native, not just correct
- Works across all websites — no copy-paste
- Translate mode: write in Chinese/Japanese/etc., get native English
- Most affordable premium plan ($4.9/mo)
- 10 free rewrites per day, forever
- Chrome-only (no Safari or Firefox)
- No inline grammar highlighting
- Full rewrite style — doesn't show tracked changes
Try NativeProse Free
10 free rewrites every day. No credit card. Works in Gmail, Slack, LinkedIn, and everywhere else.
Add to Chrome — It's Free2. Grammarly — Best for Grammar Correction
Grammarly is the most installed writing extension on Chrome, and for good reason. It catches grammar mistakes, spelling errors, and punctuation issues in real time across almost every website. The inline suggestions are clear and easy to accept with one click.
The free plan handles basic grammar and spelling. The premium plan ($12/month) adds tone detection, clarity improvements, and some style suggestions. The Business plan adds team features.
The main limitation: Grammarly makes your writing correct, but it doesn't make it sound natural. Non-native speakers often find their Grammarly-edited text still feels stiff or formal in unintended ways. Grammarly fixes rule violations — it doesn't replace word choices with what a native speaker would actually say.
- Best-in-class grammar detection
- Works on almost every website
- Inline suggestions (easy one-click accept)
- Strong free plan for basic checking
- Doesn't fix "sounds foreign" problem
- Premium is expensive ($12/mo)
- Can be intrusive / over-corrective
- AI features require premium
3. Wordtune — Best for Sentence-Level Rewrites
Wordtune's core feature is offering multiple alternative phrasings for any sentence you select. Highlight a sentence, click Wordtune, and you get 5–8 different ways to say the same thing — ranging from casual to formal.
This is useful when you know what you want to say but can't find the right words. The downside is that it works sentence by sentence, which makes rewriting a full email or document slow and tedious. At $13.99/month, it's also one of the pricier options for what it does.
- Multiple alternatives to compare
- Good for finding the right phrasing
- Casual/formal tone toggle
- Sentence-by-sentence only (slow for full docs)
- Pricier than alternatives
- Free plan limited to 10 rewrites/day
4. Compose AI — Best for Email Autocomplete
Compose AI takes a different approach: instead of rewriting what you've written, it autocompletes as you type — similar to Gmail's Smart Compose, but more powerful. It learns your writing style and suggests full sentence completions inline.
It's genuinely useful for writing repetitive emails quickly. But it doesn't improve the quality of your writing — if your natural English has patterns that sound non-native, autocomplete will just repeat those patterns faster.
- Speeds up email writing significantly
- Works well in Gmail
- Free plan available
- Doesn't improve writing quality
- Can feel intrusive while typing
- Limited to certain sites
5. Jasper — Best for Marketing & Long-Form Content
Jasper is an enterprise-focused AI writing platform with a Chrome extension for browser-based writing. It's built for marketing teams generating large volumes of content — blog posts, ad copy, product descriptions, social media.
At $39/month minimum, it's completely overkill for individuals. The extension itself is relatively limited compared to the full Jasper web app. For anyone writing personal or professional English, this is not the right tool.
- Powerful for marketing content
- 50+ templates for different content types
- Brand voice training
- Extremely expensive ($39/mo minimum)
- No free plan
- Overkill for individual users
Bottom Line: Which One Should You Install?
The right extension depends on your actual problem:
- English is your second language and you want to sound native → NativeProse. It's built exactly for this, and it's the most affordable option.
- You're a native speaker who makes typos → Grammarly free plan is enough.
- You write a lot of emails and want to type faster → Compose AI.
- You want to compare alternative phrasings → Wordtune.
- You run a marketing team → Jasper (if you have the budget).
One important note: most people use Grammarly by default because it's the most well-known. But "most popular" doesn't mean "best for your use case." If you're a non-native speaker, Grammarly will fix your typos but leave your writing sounding foreign. NativeProse solves the actual problem.
The best part: NativeProse has a permanent free tier — 10 rewrites per day, no credit card required. Try it alongside whatever you're currently using and see the difference.
Try NativeProse — Free, No Credit Card
The only Chrome extension built specifically to make ESL writing sound native. Works in Gmail, Slack, LinkedIn, and everywhere else you write online.
Add to Chrome — It's Free