A micro-SaaS that fills cancelled appointments from a waitlist
A tool for local businesses that texts a waitlist when a slot opens and updates the calendar.
Problem it solvesCancelled appointments leave empty slots and staff have to call people manually.
A maker built a small fix for booking and scheduling tools after scanning one-star reviews. It helps local businesses fill cancelled appointments from a waitlist and reports $9,027 MRR from 153 businesses paying $59/month.
How they grewfound via scanned one-star reviews across booking and scheduling tools
PromptSmiley 🟡
@Prompt0Guy
I TOLD GPT ASTRA TO FIND A MICRO-SAAS HIDING IN 50,000 ONE-STAR REVIEWS. IT FOUND ONE NOBODY WAS BUILDING. It now does $9K/month. I didn’t upload a spreadsheet or spend days reading reviews. I told Astra to find repeated, expensive problems customers were already describing, but the software companies kept ignoring. It scanned 50,000 one-star reviews across booking and scheduling tools. One complaint kept appearing: “My appointment was cancelled. I had people waiting. But filling the slot still meant calling everyone manually.” The software could manage calendars. It couldn’t recover revenue from a cancelled slot. So I built the smallest possible fix: A cancellation hits the calendar → Astra texts the waitlist → the first person to reply gets the slot → the calendar updates itself. No new booking platform. No CRM. Just a revenue leak getting closed in real time. 153 local businesses pay $59/month. $9,027 MRR. That’s the opportunity most people miss. The best micro-SaaS ideas aren’t hidden in trend reports. Bookmark this post. This week I’m sharing the full one of my workflows for free Follow me so you don’t miss the guide.
- MRR
- $9K
- Paying customers
- 153


