Substack Insights (Unofficial)

Analytics for Substack creators. Track post performance, publishing patterns, and Notes engagement. Not affiliated with Substack.

WHAT YOU GET Posts Analytics - Your top posts ranked by weighted engagement score (comments count 5×, restacks 3×, likes 1×) - Sortable by any metric — click any column to re-rank by likes, comments, restacks, views, open rate, or signups - Top converting posts: which articles drove the most free signups and paid subscriptions - Best day and best time to publish, calculated from your actual engagement history - Optimal post length based on what your audience responds to - Average word count across your entire archive Notes Analytics - Full engagement breakdown for your Substack Notes (likes, restacks, replies) - Best day and best time to post Notes for maximum reach - Top Notes ranked by weighted engagement (replies count 5×, restacks 3×, likes 1×) - Sortable table — find your most-replied, most-restacked, or most-liked Notes instantly Export for AI Analysis - Export your full post dataset to CSV with one click - Includes suggested prompts for ChatGPT, Claude, and other AI tools - Ask questions like "What topics should I write more of?" or "Why did this post outperform the others?" --- HOW IT WORKS 1. Install the extension 2. Navigate to your Substack publication 3. Click the Substack Insights icon to open the side panel 4. Hit "Analyze" — the extension fetches your posts and Notes directly from Substack's API using your logged-in session 5. Your full dashboard appears in seconds No account required. No data leaves your device. Your Substack session cookie is used only to read your own analytics — the same data you can see when logged in. We never write, modify, or store anything. --- PRIVACY FIRST Every calculation happens locally in your browser. Your session cookie never leaves your device. We have no backend that touches your Substack data. You can verify this — the extension's network requests go only to substack.com, nowhere else. --- PRICING Free for publications under 1,000 subscribers — full access, no limits. Pro plan ($19.99/month) for publications with 1,000+ subscribers. --- NOT AFFILIATED WITH SUBSTACK This is an independent tool built by a Substack creator, for Substack creators. "Substack" is a trademark of Substack Inc. This extension is not endorsed by or affiliated with Substack in any way. --- Questions or feedback? Email support@substackinsights.com