Stackwise

Advanced analytics and subscriber CRM overlaid directly on Substack.

Stackwise turns your Substack dashboard into a real analytics and growth tool — without sending a single byte of your data anywhere. It runs entirely inside your browser, on the pages you already use. Substack collects a lot of data about your publication. It shows you very little of it. Stackwise surfaces the answers Substack keeps hidden: which Note actually brought you each subscriber, who your real top fans are, which Substacks share your audience, and what content drives your paid signups. WHY WRITERS INSTALL STACKWISE You publish Notes, posts, and emails — but you're flying blind on what's actually working. Open rates and like counts don't tell you what grows your list or your revenue. Stackwise connects the dots Substack leaves disconnected, right on top of the dashboard you already use. No external app, no copy-pasting data into spreadsheets, no account required to start. WHAT YOU GET, FREE • Notes performance dashboard — every Note you've published, ranked by engagement, injected at the top of your home page • Per-post score badges — instantly see which posts beat your personal average open rate • Growth pills — how many new subscribers each post drove in its first 24 hours • Send-time heatmap — discover the day and hour your audience actually opens, so you stop guessing when to publish • Publishing streak tracker — keep your cadence honest with a weekly streak counter • Subscriber CRM sidebar — open any subscriber to see their full engagement history and save private notes • Traffic sources — where your readers really come from, at a glance • Cohort retention — see how each month's signups are sticking around WHAT YOU GET WITH PRO • Note-to-subscriber attribution — for every Note, see which subscribers joined right after engaging with it. This is the data Substack has but never shows you. It's the difference between "this Note got likes" and "this Note got me subscribers." • Top Fans — every subscriber scored and ranked by real engagement (comments, shares, gifts, opens, clicks, revenue). Find the 5% of readers who amplify you most and reward them. • Collab Finder — discover the Substacks that share your audience, with a ready-to-send outreach message. Cross-recommend and grow together. • Hook Library + Draft Scorer — Stackwise studies the openers from YOUR best-converting Notes, then scores your next draft against your own winning patterns. Not generic AI advice — your patterns. • Win-Back Generator — for subscribers who cancelled or went quiet, get a personalized, ready-to-edit re-engagement email built from their real history. • Conversion Insights — for every paid subscriber, trace back to the post or note that likely converted them. See your actual conversion engine. YOUR DATA NEVER LEAVES YOUR BROWSER Stackwise reads your Substack data using your existing logged-in session and analyzes everything locally on your device. There are no Stackwise servers receiving your data. No tracking, no telemetry, nothing sold or shared — ever. Your private notes and cached stats live only in your browser. The only network requests Stackwise makes are to substack.com, to read the data it shows you. This isn't a side feature. It's the whole design. A tool that helps you understand your audience has no business harvesting it. WHO IT'S FOR Stackwise is built for serious Substack writers who treat their newsletter like a business — people who want to know what actually grows their audience and revenue, not just vanity metrics. If you publish regularly and want every Note and post to pull its weight, this is for you. GETTING STARTED Install, open one of your Substack publications, and the free analytics appear immediately — no signup required. Want to try the Pro features? Flip the plan switch in the popup; everything's unlocked free during the beta. Stackwise is an independent extension and is not affiliated with or endorsed by Substack.