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A local-first subscription tracker that turns scattered renewals into a clear monthly and annual spend picture.
about 31,000 downloads · around ¥100,000 on launch day
A viral spike can prove demand; renewal cohorts prove the subscription business.
Fewer bars = easier, cheaper, or faster for an AI-assisted solo builder. Editorial judgments based on the case details.
The creator built SubscBox as a phone app for manually recording services, seeing monthly and annual totals, and reviewing subscription spending. He said it briefly reached number one in the Finance category and number four overall in the App Store, with about 31,000 downloads.
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Data credibility: The app creator described App Store ranking, download, and sales figures and demonstrated the product. The revenue and download counts are founder-reported; no independent payment records or cohort retention data were provided. Amounts are preserved in Japanese yen, as the transcript gives no conversion.
SubscBox lets users enter services and their price and billing date, then inspect upcoming renewals, monthly and annual totals, and charts. A review flow helps identify subscriptions the user may no longer value.
The creator described a freemium model, with analytics charts reserved for the Pro plan. The price is not available here; avoid inferring conversion or average revenue per download from total sales.
The described stack is Expo with React Native, local SQLite storage, RevenueCat for subscription entitlements, and PostHog analytics. Claude Code was used for implementation, with the creator saying he wrote no code by hand.
Copy the narrow promise: give people a quick, understandable picture of recurring spend. Validate the pain with a small user cohort before adding bank integrations or automated detection.
This is a members-only idea. All 10 sections, the quick-reference card, and both build prompts are in the Unicorn Club — with every section of all 1,292 ideas.
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