A habit coach inside WhatsApp. Daily check-ins, it remembered what you told it, and there was no app to open. I built it in January 2026 and retired it in October.
What it was
Most habit apps ask you to remember to open them. Luna did the opposite. She messaged you, asked how the walk went, and picked up from what you had said last time.
Why it stopped
Two people used it. There were around 1,500 messages in the first two months, then it went quiet.
WhatsApp was the whole point, and also the trouble. Meta's template rules and the Twilio costs did not add up for an audience of two.
What stays
I still believe that part. If a coach lives where you already are, you do not have to remember to use it. The next version will find a cheaper door.
A day with Luna
An illustrative exchange, not a real user's messages.
Tell me what you are working on. I read everything myself, and I am happy to say what I learned the hard way.
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