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An intermittent-fasting timer whose free tracker builds the daily habit and whose premium progress tools are estimated at about $300K a month from US iPhone users alone.
~40K monthly US iOS downloads (Sensor Tower estimates)
The timer is free and almost trivial; the money is in what a consistent faster wants after a few weeks — history, trends and a clear picture of progress. Simple, BodyFast and Fast Track sit in the Health & Fitness top 100 at the same time, so the category supports several winners.
Fewer bars = easier, cheaper, or faster for an AI-assisted solo builder. Editorial judgments based on the case details.
Zero, developed by Zero Longevity Science, turns intermittent fasting into a repeatable mobile routine. Users start a session, choose a common protocol such as 16:8, 18:6, or 24 hours, review past fasts, and track a streak. The free timer creates the habit; paid progress tools give consistent users a reason to upgrade. In a video promoting his Base44 course, creator Mikey No Code opens Zero's public Sensor Tower page, which estimates about 40,000 monthly downloads and $300,000 a month in revenue from US iOS users. These are third-party estimates for one platform and one country, not company accounts. The same category view shows Simple, BodyFast and Fast Track in the Health & Fitness top 100 at the same time, suggesting multiple products can coexist. The business pattern is a simple utility with a daily return trigger and premium depth after the user has established a routine. For a new entrant, the hard work is trust, retention, and a clearly differentiated approach to fasting rather than building the timer itself.
For a fasting tracker, the first customers usually come from people already comparing protocols, tracking progress, or looking for help maintaining a routine.
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Data credibility: Revenue and downloads are Sensor Tower estimates that the creator (Mikey No Code) pulls up on screen from Zero's public overview page; they cover US iOS only and are not company-reported. Android, other countries, pricing and retention are not covered. The video is a promotion for the creator's Base44 course: the free-tier limits in his demo build are his own choices, not this app's actual paywall.
The first dollar for a fasting tracker should arrive after the user has experienced the timer and wants continuity. Keep starting and stopping a fast free; charge for durable history, flexible protocol plans, trends, reminders, or a more detailed progress view.
The natural loop is habit, accumulated data, and a better reason to return. Each fast adds to the history and streak; a useful progress view makes that record feel more valuable; continued use makes switching to another timer less attractive.
A quiet growth period is normal for a utility whose value compounds only after repeated use. Keep the product narrow while you test whether people start sessions, finish them, and return for another week.
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