NagMeLater – WhatsApp Task Reminders

A reminder and to-do list app that sends notifications through WhatsApp instead of traditional push notifications. Users can manage tasks via chat interface and get reminded in the messaging app they already use daily.

WhatsApp's 2 billion active users and notoriously high message open rates (often cited above 90%) make chat-native reminders a genuinely different delivery mechanism than push notifications, which users routinely ignore or disable. The closest substitute is Twilio-powered reminder bots people stitch together themselves, but no polished consumer product has clearly won this space — Todoist and Things don't touch WhatsApp at all. At $1k–5k/month, this likely works as a low-price subscription with high retention if the core habit sticks, since WhatsApp's ubiquity removes the activation friction that kills most productivity tools. The biggest risk is WhatsApp's API terms: Meta restricts messaging at scale, charges per conversation after free tiers, and has historically shut down unofficial bots — so the business can be kneecapped by a policy change or rising per-message costs before it reaches sustainable revenue.