A GPT wrapper for cover letters earns about $550 MRR for about $16 a month in costs
Vince built it in one week and spends about an hour a month on it.
Subject: CoverLetterGPT (Vince, Wasp)Subscription GPT wrapper
Case Overview & Background
Vince, a developer relations lead at Wasp, built CoverLetterGPT, a GPT wrapper that writes cover letters, in one week using the free Open SaaS template. He reports about $550 MRR, $9,912 net revenue since launch and average monthly profit of $416.
How AI Is Used
Step-by-Step Process
Built in one week on a free SaaS boilerplate.
About $12 hosting and $3 API a month.
SEO, social media and Reddit, no ads.
Customer Acquisition & Distribution
Limitations, Risks & Failure Modes
What may not apply to you, and what could go wrong:
- Self-reported
- Small income
- Stripe and currency fees are the biggest cost
Key Takeaways
- Tiny apps can earn steady side income
- AI API costs can be negligible
- Count fees in your margin
Sources
Open SaaS: Here's my SaaS Cost, Profit, and Marketing Breakdown
Note: Full cost and profit table.
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