# AI Checker vs NotesIQ: which to pick

> AI Checker vs NotesIQ: pricing, platforms, launches, upvotes and founders side by side on ProductsFarm, with notes on which to pick.

Canonical: https://productsfarm.com/compare/ai-checker-vs-notesiq
Last updated: 2026-11-10

|  | [AI Checker](https://productsfarm.com/product/ai-checker) | [NotesIQ](https://productsfarm.com/product/notesiq) |
| --- | --- | --- |
| What it is | Free Japanese text-style analysis tool. No signup required. | Analytics and scheduling for Substack Notes, inside your browser |
| Pricing | Freemium | Paid |
| Platforms | Web | Chrome extension, Web |
| Categories | Writing and content, AI | Analytics, Marketing, Writing and content |
| Made for | writers, students, bloggers | substack writers, newsletter creators, independent publishers |
| Built with | [Vercel](https://productsfarm.com/tech-stack/vercel), [Google Tag Manager](https://productsfarm.com/tech-stack/google-tag-manager) | [Next.js](https://productsfarm.com/tech-stack/nextjs), [React](https://productsfarm.com/tech-stack/react), [Vercel](https://productsfarm.com/tech-stack/vercel), [Dodo Payments](https://productsfarm.com/tech-stack/dodo-payments), [Google Analytics](https://productsfarm.com/tech-stack/google-analytics), [Tailwind CSS](https://productsfarm.com/tech-stack/tailwind-css) |
| Upvotes | 0 | 25 |
| Website | [aibunsho.com](https://aibunsho.com/) | [notesiq.app](https://www.notesiq.app/) |

## About AI Checker

AI Checker (AIチェッカー) is a free, no-signup Japanese text analysis tool. It uses statistical rules to surface writing features such as length patterns, stock phrases, sentence-ending habits, and repeated phrases, and can optionally add a DeepSeek-assisted style review. It does not claim to determine whether a text was written by AI.

## About NotesIQ

NotesIQ is a Chrome extension for Substack writers who want to understand how their Substack Notes perform. It reads your Notes through your existing Substack session and shows them in a dashboard ranked by engagement, with likes, restacks, comments and content type tracked for each Note. A Viral Alert flags a Note that takes off compared with your own baseline, and the tool keeps a longer history than Substack's own dashboard, which the site says shows only the last 90 days.

The extension also helps with timing and posting. A 7-day by 6-time-slot Best Time heatmap is built from your own posting history, alongside your current posting streak. You can compose a single Note or load a week of Notes into a queue, and NotesIQ uses Substack's own scheduler to publish them at the times you set. A Media Kit feature turns your subscriber count, top Notes and engagement into a one-page sponsor summary that can be exported from the panel.

NotesIQ is aimed at Substack creators who post Notes regularly and want to decide what to write and when based on their own numbers. The site says your Notes, profile and subscriber stats stay in your browser's storage, with no NotesIQ server receiving them, and that the product is a one-time $4.99 lifetime purchase with no subscription.

## Related

- [AI Checker](https://productsfarm.com/product/ai-checker)
- [NotesIQ](https://productsfarm.com/product/notesiq)
- [More comparisons](https://productsfarm.com/compare)