Proofly
Proofly is a free Chrome extension that proofreads your writing on-device with Chrome's built-in Gemini Nano AI — your text never leaves your machine.
For $0 and zero data transmission, Proofly covers the mechanical-error job that sends most people to a cloud grammar checker in the first place. It earns its place on the combination of on-device Gemini Nano checking, per-correction-type toggles, and a sidebar that collects every issue at once. It won't help with tone, rewriting, or clarity — and it's Chrome-only on Chrome 141+ hardware — so treat it as a privacy-first correctness checker, not a Grammarly replacement. If your drafts are sensitive and your writing happens in Chrome, the tradeoff is worth taking.
Verified 4d ago · liveness 53/100 · cite: rightaichoice.com/tools/proofly
- Privacy-conscious writers who won't paste sensitive text into cloud grammar checkers
- Students proofreading essays and applications in Chrome, including offline
- Professionals checking client emails, HR notes, or legal correspondence on the web
- Chrome users who want a free, no-account grammar checker with no telemetry
- Writers who need style suggestions, tone analysis, or full-sentence rewriting
- Firefox, Edge, or Safari users — Proofly is a Chrome extension only
- Anyone on Chrome below version 141 or on hardware that can't run Chrome's built-in AI models
We scan live Reddit threads, YouTube comments, X posts, G2 reviews and other communities — and hand you an honest verdict in under a minute.
- Honest verdict, not marketing
- Real pros & cons from real users
- Attributed quotes with receipts
3 free scans · no card needed
Skip Proofly if you need tone, clarity, or rewriting help, or if you work outside Chrome — it corrects mechanical errors only and won't run on Firefox, Edge, Safari, or Chrome below version 141.
Proofly is a free Chrome extension with no account and no telemetry, so it sits below paid cloud grammar checkers like Grammarly on cost while giving up their tone, clarity, and rewriting features. It fits individuals who want mechanical proofreading at zero spend; teams needing shared style guides should look at paid writing platforms instead.
In short
Proofly — Proofly is a free Chrome extension that proofreads your writing on-device with Chrome's built-in Gemini Nano AI — your text never leaves your machine. Best for Privacy-conscious writers who won't paste sensitive text into cloud grammar checkers, Students proofreading essays and applications in Chrome, including offline, Professionals checking client emails, HR notes, or legal correspondence on the web. Free to use.
What's new in Proofly
Checked 4 days agoAcross the latest 1 update: 1 changelog entry.
What people actually say about Proofly — is it worth it?
We scanned public community sources for Proofly on Jul 3, 2026 and could not establish that the discussion we found is about this tool rather than something else sharing its name. Our own analysis of that scan says the posts were off-subject. Rather than publish a sentiment score built on the wrong subject, we publish nothing here and re-run the scan.
Viability Score
How well maintained and how widely used is Proofly? Built from what the vendor actually publishes (docs, changelog, tutorials, integrations, pricing), whether the site is live, and how much real users discuss it. How we calculate this
Last calculated: October 2026
How we score →Key Features
- On-device proofreading via Chrome's built-in Gemini Nano AI model
- Spelling, grammar, and punctuation error detection
- Capitalization, missing word, and preposition corrections
- Real-time underlining of detected errors
- Native-feeling correction popovers on underlined text
- Dedicated sidebar listing all issues for review in one pass
- Per-correction-type toggles (e.g., grammar on, capitalization off)
- Custom keyboard shortcut to check a selected chunk of text
- Auto-correct mode and manual trigger mode
- Works on input fields, textareas, and contenteditable elements
- No account, no tracking, no telemetry; data not collected or sold
- Works offline after the initial model download
- Open-source code you can audit
- Chrome extension delivered from the Chrome Web Store
About Proofly
Proofly is a free, open-source Chrome extension that proofreads text inside your browser using Chrome's built-in AI (Gemini Nano), so the checking happens on your device instead of a vendor server. It catches spelling, grammar, and punctuation errors, plus capitalization slips, missing words, and wrong prepositions, then surfaces fixes through native-feeling underlines, correction popovers, and a sidebar that lists every issue in one pass. The pitch is simple: the private emails, HR notes, and coursework you'd rather not paste into a cloud grammar checker never leave your machine. Control is granular. You can toggle correction types individually — grammar on, capitalization off — bind a custom keyboard shortcut to check a selected chunk, and pick between auto-correct and manual trigger modes. It runs on input fields, textareas, and contenteditable elements, which covers most web forms, comment boxes, and browser-based editors, and it keeps working fully offline after the initial model download. The developer discloses that data is not collected or sold, there's no account, and no telemetry. Two constraints matter up front. It requires Chrome 141+ on hardware capable of running Chrome's built-in AI models, and it is a correctness checker rather than a writing coach — no style suggestions, tone analysis, or full-sentence rewriting. The Chrome Web Store listing is version 0.6.0, last updated May 8, 2026, at 111KiB, sitting at 4.2 stars from 5 ratings. Against Grammarly and the crop of cloud AI grammar checkers, Proofly trades feature depth for privacy and price. If your writing lives in Chrome and you want mechanical accuracy at zero cost with no data leaving the device, it's a direct fit. If you need rewriting, tone, or clarity help, a cloud assistant still does more — that's the tradeoff, not a hidden catch.
Behind the Verdict
Proofly's whole argument is that the AI grammar checker you need is already sitting inside your browser, so there is no reason to ship your draft to somebody else's server. That is a real architectural difference, not a slogan: Proofly leans on Chrome's built-in Gemini Nano model, so checking happens on your device and keeps working offline after the initial model download. The developer discloses that data is not collected or sold, there is no account, and no telemetry — which means no signup wall between you and a corrected sentence. Where it earns its keep is the browser's awkward middle ground. It works on input fields, textareas, and contenteditable elements, which covers webmail, comment boxes, ticketing forms, and browser-based editors. It fixes spelling, grammar, punctuation, capitalization, missing words, and prepositions, and it lets you switch correction types on and off individually — grammar on, capitalization off — plus bind a keyboard shortcut for checking a selected chunk and choose between auto-correct and manual trigger modes. The sidebar that lists every issue in one pass is the feature that makes correction types actually usable, because you can see the full set before you accept anything. What it does not do is coach you. There are no style suggestions, no tone analysis, and no full-sentence rewriting; if your problem is that a paragraph reads badly rather than incorrectly, Proofly will not notice. It is also constrained by its host: Chrome 141+ and hardware capable of running Chrome's built-in AI models, and it only reaches text inside Chrome, so standalone desktop apps and other browsers are out of scope. The listing is version 0.6.0 (updated May 8, 2026), 111KiB, and the review base is small at 4.2 stars from 5 ratings. The honest framing is that Proofly is a correctness checker positioned against Grammarly, and it wins exactly one dimension decisively — privacy — while losing on depth. Pick it when the text is sensitive and the errors you make are mechanical. Keep a cloud assistant around when the text needs to get better, not just correct.
Researching Proofly? Get your full AI stack in 60 seconds.
Free, no signup — tell us your goal and get tools matched to your budget & existing stack.
Real-world workflow fit
Concrete scenarios for the personas Proofly actually fits — and what changes day-one when you adopt it.
You draft a sensitive client email in webmail inside Chrome and Proofly underlines spelling, grammar, and punctuation issues as you type, with correction popovers you accept or dismiss inline.
Outcome: You send a clean email without the draft ever leaving your device, because checking runs on Chrome's built-in Gemini Nano model locally.
You write an essay in a Chrome-based document editor, and Proofly highlights capitalization and missing-word errors; you open the sidebar to review every issue in one pass rather than hunting them one by one.
Outcome: You catch the mechanical errors before submission, and it keeps working offline after the model download when your connection drops.
You turn grammar checking on but capitalization off, bind a keyboard shortcut, and switch to manual trigger mode so Proofly only checks the chunk you select.
Outcome: Proofreading fits your existing habits instead of firing corrections at everything you type across input fields, textareas, and contenteditable elements.
Use Cases
- Proofread client and internal emails before you hit send, without pasting them into a cloud checker
- Check grammar and spelling in web forms, comment boxes, and social posts as you type
- Review academic or application writing inside browser-based editors in Chrome
- Catch errors in sensitive or confidential text that must not leave your device
- Keep proofreading while traveling or on an unreliable connection after the model download
Models Under the Hood
as of 2026-10-15
Limitations
- Requires Chrome 141+ and a device capable of running Chrome's built-in AI models, so older Chrome builds and low-spec hardware are excluded.
- It is a correctness checker only: spelling, grammar, punctuation, capitalization, missing words, and prepositions, with no style suggestions, tone analysis, or rewriting.
- It applies to input fields, textareas, and contenteditable elements within Chrome, so it won't check text in standalone desktop apps or other browsers.
- Proofreading runs 100% on-device and works offline after an initial model download.
- As of the May 8, 2026 Chrome Web Store listing it shows 215 users, is version 0.6.0, and holds a 4.2 rating from 5 ratings, so the review base is small.
as of 2026-10-14
Verification history
We have re-verified Proofly 9 times since . Each pass re-reads the vendor's own pages and re-checks every listed field against that evidence; passes where nothing had changed are marked as such.
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
Showing the 6 most recent of 9 verification passes.
Free to cite with attribution — this page re-verifies continuously.
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Plans compared
For each published Proofly tier: who it actually fits, and what it adds vs. the previous tier. Cross-reference the cost calculator above for projected annual outlay.
Free
$0
Ideal for
Individual Chrome 141+ users who want on-device proofreading at zero cost and are willing to trade tone and rewriting help for privacy
What this tier adds
Starting tier: free, no account, on-device Gemini Nano checking with per-correction-type toggles, keyboard shortcut, and offline use after model download
Where the pricing makes sense
The company stage and team size where Proofly's pricing actually pencils out — and where peers do it cheaper.
Proofly is a free Chrome extension with no account and no telemetry, so it sits below paid cloud grammar checkers like Grammarly on cost while giving up their tone, clarity, and rewriting features. It fits individuals who want mechanical proofreading at zero spend; teams needing shared style guides should look at paid writing platforms instead.
Setup time & first value
How long it actually takes to get something useful out of Proofly — broken out by persona, not the marketing-page minute.
Install from the Chrome Web Store and it is live in under a minute, provided you are on Chrome 141+ with hardware that can run Chrome's built-in AI models. First use requires the Gemini Nano model download; after that, checking runs locally with no account to create.
Switching to or from Proofly
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- →From Grammarly: install Proofly and use it alongside your existing checker for private drafts, since Proofly requires no account and adds on-device checking in Chrome.
- →From browser spellcheck: Proofly adds grammar, punctuation, capitalization, missing-word, and preposition corrections on top of native spelling checks.
- →From pasting drafts into a cloud checker: write directly in the Chrome field and let Proofly underline issues as you type.
- ↗To Grammarly: move over if you need style suggestions, tone analysis, and full-sentence rewriting rather than mechanical corrections only.
- ↗To a desktop writing app: move over if you need proofreading outside Chrome, since Proofly only reaches input fields, textareas, and contenteditable elements in the browser.
- ↗To a team writing platform: move over if you need shared dictionaries, style guides, or collaborative proofreading.
Resources & Guides
Tutorials & Learning
YouTube returned 6 videos for “Proofly”, and we withheld 6: 6 could not be judged, because “Proofly” is a single word that other videos use for other things. We are showing none, because we could not prove any of them are about Proofly.
Official links
Tools that pair well with Proofly
Common stack mates teams adopt alongside Proofly, with the specific reason each pairing earns its keep.
Glarity
Glarity is a free Chrome extension that summarizes YouTube videos, PDFs and webpages with ChatGPT, Claude and Gemini.
Arvin
Arvin is a Chrome-extension AI assistant combining chat with GPT, Claude and Gemini, one-click writing tools, web translation, PDF reading and template-based
Wordtune
Wordtune is an AI writing assistant from AI21 Labs that paraphrases, rewrites, proofreads, and summarizes text and YouTube videos.
Featured Head-to-Head Comparisons
Proofly vs Gem
Gem and Proofly serve completely different needs: Gem is a comprehensive, paid recruiting platform for talent teams, while Proofly is a free, privacy-first proofreading extension for Chrome users. Choose Gem if you need an all-in-one ATS/CRM with AI agents for sourcing, screening, and fraud detection. Choose Proofly if you want a lightweight, on-device grammar checker that never sends your data to the cloud. They are not direct competitors.
Proofly vs Letterhead
These tools address completely different needs. Proofly is a free, privacy-focused Chrome extension for on-device proofreading. Letterhead is a paid, enterprise-grade newsletter OS for teams managing multiple brands. Choose Proofly if you want a private, lightweight grammar checker; choose Letterhead if you run a multi-newsletter operation and need to scale production, audience management, and revenue.
Proofly vs Poke Interaction Co
Poke is a powerful AI assistant that manages email, calendar, and automations from messaging apps, ideal for power users willing to pay for deep integrations. Proofly is a free, private grammar checker for Chrome users who never want their text leaving the device. Your choice: control your digital life (Poke) or perfect your writing with zero data risk (Proofly).
Harvey vs Proofly
If you're a law firm or legal department needing an end-to-end AI platform for contract analysis, due diligence, and litigation support, Harvey is the obvious choice—though you'll need to contact for pricing. If you're an individual writer who values privacy and just wants a no-fuss, free grammar checker running locally on Chrome, Proofly is perfect. These tools serve completely different needs; pick based on your domain and privacy requirements.
Alternatives to Proofly
View all
Glarity
Glarity is a free Chrome extension that summarizes YouTube videos, PDFs and webpages with ChatGPT, Claude and Gemini.
Frequently Asked Questions
Categories
Best-of guides
Used Proofly? Help shape our editorial sentiment research.