What is StackStats?
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. Pricing: paid, one-time. 1-Year $39 / Lifetime $79, free live demo. Not affiliated with Substack Inc.
Key features
- One-click Substack sync
- 180-day subscriber growth forecast
- Churn risk detection, superfans and upgrade-ready readers
- Best posting time, growth sources and publication deep dive
- Optional local (Ollama) or bring-your-own-key AI; 100% offline, Mac & Windows
- Paid one-time: 1-Year $39, Lifetime $79; free live demo
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