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Cold Call Gym
- AI Sales Practice Bot
- $500+ monthly revenue
duckkg5 describes their app on Hacker News…
Just call a number and practice a cold call with a bot.
The app is Cold Call Gym – you dial a phone number, practice your sales pitch on an AI prospect, and get a performance report via SMS afterward. Nothing to download, no account needed.
Earning $500/month, with 3-5 new users signing up per day. The paid plan is $39/month.
But here’s the kicker: about a third of his traffic comes from ChatGPT 
People ask ChatGPT how to practice cold calling, and it recommends Cold Call Gym…
I’m not doing any marketing at all.
It’s the new SEO: build something genuinely useful for a specific problem, and AI assistants start recommending you.
The “just call a number” format could work for other practice scenarios…
- job interviews
- customer service training
- language learning
- difficult HR conversations
- negotiation
Pick a niche where people need low-pressure reps, spin up an AI phone bot and let ChatGPT be your marketing department 