1. Flutter Community groups
Search Facebook for "Flutter Community" and "Flutter Developers" and join the largest active ones. Most ban self-promotion outside designated threads, so read the pinned rules first. Search inside the group for "launch", "beta testers" and "landing page" to find solo devs shipping their first app. Reply with the steps: "Put up a one-page site with a signup form, post your build progress weekly, and email the list when TestFlight opens."
2. React Native and Expo groups
Join groups that come up when you search "React Native" and "Expo developers" on Facebook. These developers often ship side projects and ask how to get early users or beta testers. Answer the actual question in full. Only mention your tool if someone asks what you use, and say plainly that you built it.
3. No-code app builder groups
Search for groups around FlutterFlow, Bubble, Adalo and Glide. Many members are first-time founders building a mobile app with no technical background and no audience. Look for posts like "how do I validate my app idea" and suggest a waitlist page as a test: "Set a goal of 100 signups in two weeks. If you can't get them, change the pitch before you build more."
4. SaaS and startup founder groups
Join "SaaS Growth Hacks" and large founder groups that turn up for "startup founders" and "indie hackers" searches. Many allow promotion only in a weekly thread, so post there on the right day with one line on who it is for. Example: "Built a waitlist tool for indie app devs: signup page, referral spots, and an email when your beta is ready. Free while I collect feedback."
5. App marketing and ASO groups
Search "app marketing", "ASO" and "mobile app growth" on Facebook. Developers there worry about launch day downloads and App Store ranking. Explain that a list of people who already asked for the app gives a launch day spike, and share how to write the signup email. Skip any group whose feed is mostly spam links, because the buyers have already left.
6. Product launch and beta tester groups
Find groups for "beta testers" and "app launch" where devs post looking for testers. These people are collecting emails by hand in Google Forms or DMs. Comment with a fix for their current setup, for example: "Add a referral link so testers who invite friends move up the queue. It usually spreads further than one post."
7. Run a daily 20-minute routine
Every day, search your groups for "waitlist", "pre-launch", "beta" and "landing page" and sort by recent. Answer two or three posts properly and save any person who replies to you in a simple sheet. Follow up by DM only when they have asked a direct question. Hulby, an AI cofounder, can find and draft these replies for you every day so you only review and post.
Mistakes to skip
- Dropping your link in the first reply before helping with the actual problem.
- Posting the same promo message in ten groups on the same day, which gets you flagged and removed.
- Ignoring the group rules and promo-thread days that the admins pin at the top.
- Sending cold DMs to everyone who posted, instead of only people who asked you a question.
Want this done for your Waitlist tool for indie app developers, every day?
Hulby finds the people asking for what you built, writes every reply and email, and keeps you on it until they pay. Free to start.
Find my first customersQuestions
Do I need my own Facebook group?
No. Start in groups that already have your buyers. A group of your own only makes sense once people already know you.
How soon can I mention my tool?
Once you have given a few useful answers, or as soon as someone asks what you use. Always say you built it.
Is it worth messaging group admins?
Yes. Ask whether a short tutorial on pre-launch signups would be welcome. Admins often say yes to helpful posts that are not promotion.
How many groups should I join?
Five to eight active ones. You can only keep up with that many properly, and fewer groups done well beats many done badly.