StackStats is a desktop analytics app for Substack writers. Connect your Substack in one click and it pulls everything in: KPIs, 30-day growth, a 180-day subscriber forecast, growth sources, churn-risk readers, superfans, readers likely to upgrade to paid, best time to post, and per-post performance. Everything is computed locally on your computer, with no servers and no account. Optional AI insights (30-day action plan, growth strategy, chat about your data) run fully offline via Ollama or with your own API key (Claude, GPT-4, Gemini, Groq, OpenRouter). Built by a Substack writer with ~3,000 subscribers for his own newsletter. Not affiliated with Substack Inc.
Key features: one-click Substack sync; 180-day growth forecast; churn risk detection; superfans and upgrade-ready readers; best posting time; growth sources; publication deep dive; optional local or bring-your-own-key AI; 100% offline on Mac and Windows. It is for Substack writers who want to understand their audience without handing their data to another cloud service. Pricing: paid, one-time. The 1-Year license is $39 and the Lifetime license is $79 (early adopter price, normally $129). There is a free live demo at demo.stackstats.app and a 14-day refund. No subscription and no account needed. Contact: hello@stackstats.app. StackStats is a /make_ (slashmake.co) company.
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