Solo Developer Builds $0.99 Mac App to Prevent Surprise Subscription Charges

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A solo developer created Trial Guard, a macOS menu bar app, after personally being charged for a forgotten free trial subscription. The app sends up to three reminders before a paid subscription begins, helping users avoid unexpected charges. Technically, the developer used NSTimer and NSCalendar to build a reliable notification scheduling system. Priced at $0.99, Trial Guard targets developers and users who frequently sign up for multiple online services and trials. The app is available via the developer's website and aims to reduce the common problem of losing track of subscription commitments.

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