1. Universal Ad Blocker
Your Best Defense Against Ads and Trackers.
Why it replaces Spello — Spell & Grammar Checker: Covers similar ground in the AI category: Your Best Defense Against Ads and Trackers.
Best Spello — Spell & Grammar Checker Alternatives in 2026
Spello — Spell & Grammar Checker is a strong option, but it is not the right fit for everyone. Below are 10 alternatives compared on rating, install base, pricing and the use case each one actually wins on.
About Spello — Spell & Grammar Checker
Free spell & grammar checker that runs 100% on your device. Private, offline, no account. Works on any Chrome — no AI chip needed.
Free
Full reviewComparison at a glance
| Extension | Rating | Users | Pricing | Best for |
|---|---|---|---|---|
| Spello — Spell & Grammar Checker (original) | — | — | Free | Free spell & grammar checker that runs 100% on your device. Private, offline, no account. Works on any Chrome — no AI chip needed. |
| Universal Ad Blocker | — | — | Free | Your Best Defense Against Ads and Trackers. |
| Clearly Reader - Your AI Reading Assistant | — | — | Free | A browser extension with reader mode for optimal experience. Features copy, translate, speech, and PDF and Markdown export. |
| NextAI Translator | — | — | Free | NextAI-Translator is a browser extension that uses the ChatGPT API for translation. |
| ViiTor Translate - AI Translation & Real-Time Bilingual Subtitles & Free | — | — | Free | The ViiTor translation provides translation for live audio & video, realizing bilingual subtitle functions. |
| Passwordstate | — | — | Free | Passwordstate for Chrome is a form filler extension that obtains credentials from Passwordstate. |
| Hero Ad Blocker | — | — | Free | Your protection against ads and malware. |
| Manganum: Sidebar with Gmail and Google Calendar | — | — | Free | One-click access to your productivity tools, even Google Calendar and Gmail. |
| WPS PDF - Read, Edit, Fill, Convert, and AI Chat PDF with Ease | 4.5 | 6M+ | Free | Users who need a free all-in-one PDF editor, converter and signer in the browser. |
| AnyDoc Translator - Translate Web and PDF | — | — | Free | The ultimate AI translator for web, files, ebooks, academic papers, images, and text |
| Monica AI | 4.9 | 3M+ | Freemium | People who want templates and translation alongside a general AI chat panel. |
Spello — Spell & Grammar Checker alternatives in detail
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2. Clearly Reader - Your AI Reading Assistant
A browser extension with reader mode for optimal experience. Features copy, translate, speech, and PDF and Markdown export.
Why it replaces Spello — Spell & Grammar Checker: Covers similar ground in the AI category: A browser extension with reader mode for optimal experience. Features copy, translate, speech, and PDF and Markdown export.
3. NextAI Translator
NextAI-Translator is a browser extension that uses the ChatGPT API for translation.
Why it replaces Spello — Spell & Grammar Checker: Covers similar ground in the AI category: NextAI-Translator is a browser extension that uses the ChatGPT API for translation.
4. ViiTor Translate - AI Translation & Real-Time Bilingual Subtitles & Free
The ViiTor translation provides translation for live audio & video, realizing bilingual subtitle functions.
Why it replaces Spello — Spell & Grammar Checker: Covers similar ground in the AI category: The ViiTor translation provides translation for live audio & video, realizing bilingual subtitle functions.
5. Passwordstate
Passwordstate for Chrome is a form filler extension that obtains credentials from Passwordstate.
Why it replaces Spello — Spell & Grammar Checker: Covers similar ground in the AI category: Passwordstate for Chrome is a form filler extension that obtains credentials from Passwordstate.
6. Hero Ad Blocker
Your protection against ads and malware.
Why it replaces Spello — Spell & Grammar Checker: Covers similar ground in the AI category: Your protection against ads and malware.
7. Manganum: Sidebar with Gmail and Google Calendar
One-click access to your productivity tools, even Google Calendar and Gmail.
Why it replaces Spello — Spell & Grammar Checker: Covers similar ground in the AI category: One-click access to your productivity tools, even Google Calendar and Gmail.
8. WPS PDF - Read, Edit, Fill, Convert, and AI Chat PDF with Ease
Easy-to-use PDF tools to view, edit, convert, fill, e-sign PDF files, and more in your browser.
Why it replaces Spello — Spell & Grammar Checker: Another popular AI extension: Easy-to-use PDF tools to view, edit, convert, fill, e-sign PDF files, and more in your browser.
9. AnyDoc Translator - Translate Web and PDF
The ultimate AI translator for web, files, ebooks, academic papers, images, and text
Why it replaces Spello — Spell & Grammar Checker: Another popular AI extension: The ultimate AI translator for web, files, ebooks, academic papers, images, and text
10. Monica AI
AI copilot for chat, translation and writing on any site.
Why it replaces Spello — Spell & Grammar Checker: Another popular AI extension: AI copilot for chat, translation and writing on any site.
Compare Spello — Spell & Grammar Checker head-to-head
Direct comparisons with the extensions people weigh against it.
Monica vs Merlin AITwo all-in-one AI sidebars compared on model access, free quota and page context.Monica vs PerplexityA general AI assistant against a cited, search-first answer engine.Merlin AI vs PerplexityBoth are ai extensions people shortlist together for ai — see how ratings, install base, pricing and day-to-day use differ.All comparisonsThe full compare hub, grouped by category.
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Frequently asked questions
What is the best alternative to Spello — Spell & Grammar Checker?
Universal Ad Blocker is the closest match. Covers similar ground in the AI category: Your Best Defense Against Ads and Trackers.
Is there a free alternative to Spello — Spell & Grammar Checker?
Yes — Universal Ad Blocker, Clearly Reader - Your AI Reading Assistant, NextAI Translator are free.