NotesIQ

Substack creators who post Notes have no reliable way to know which of their Notes actually drive growth, since Substack's own dashboard only shows 90 days of history and lacks ranking by engagement, timing data, or content-type breakdowns. Today they guess at what to post and when, manually track performance in spreadsheets (or not at all), and have no easy way to build a sponsor pitch from their stats. Posting consistently also means either staring at a blank page daily or risking a burst of Notes that compete with each other for the same audience attention, since research cited on the page found diminishing returns past 3-5 Notes a day.

NotesIQ is a Chrome extension that runs entirely in the browser, reading a creator's Notes through their existing Substack session with no server storing their data. It ranks Notes by real engagement (likes, restacks, comments) rather than raw views, flags viral Notes against the user's own baseline, and builds a 7-day by 6-time-slot Best Time heatmap along with a Content Type Breakdown and posting streak. It also drives Substack's own scheduler to auto-publish single Notes or a full week's queue, offers competitor lookup by handle, generates a one-click sponsor media kit from real stats, and includes research-backed AI prompt templates for ChatGPT/Claude to help draft Notes. Everything is a one-time $4.99 lifetime payment with no subscription.