Build a post scheduler for AI agents: $4K MRR
Riding a new trend (AI agents that need to post) can turn a small tool into real income.
#41 in Build an App with AI by earnings#94 overall on Biggest Wins
From @No-Firefighter-1453 on Reddit (r/SideProject) · Oct 2026 · Share
The Short Version
How u/No-Firefighter-1453 made $4K MRR, according to Reddit (r/SideProject).
- What: u/No-Firefighter-1453 built OpenTweet, a simple post scheduler, as a side project next to a full time job.
- Result: $4,000 MRR, up from $3,500 two months earlier, with about 50 new signups a day.
| Who | u/No-Firefighter-1453 |
|---|---|
| Tool | |
| Revenue | $4K MRR |
| Source | Reddit (r/SideProject) |
The workflow
Where & With What
What They Did
- 1The moveu/No-Firefighter-1453 built OpenTweet, a simple post scheduler, as a side project next to a full time job.
- 2Step 2Build one small app for one job
- 3Step 3Launch with an honest post
- 4Result$4,000 MRR, up from $3,500 two months earlier, with about 50 new signups a day.
Quick Answers
What tools do you need?
Just the platform account.
How much does it cost?
No paid tools needed: this case uses only the platform itself, which is free to join.
Is it allowed?
Follow the platform rules and disclose ads.
Watch out: Early growth came from commenting on relevant posts by hand, which takes steady effort.
Try It Yourself
(Our template, not the creator's prompt.) I want to build a small paid app that fixes one annoyance: [problem]. Write the feature list for version 1 (one job only), a 5-step build plan with an AI coding tool, and a short honest launch post.
Your first step
Paste the prompt into your AI assistant and swap the [brackets] for your own niche.
Full write-up & sources
More detail: Growth took off after adding integrations for popular AI agents, plus SEO and answer engine pages.
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