A non-technical founder vibe coded a content tool with Claude that reached 2,900 euros MRR
Cathy Kim publishes line-by-line costs: about $47 a month to run.
Subject: Soulin Social (Cathy Kim)Subscription content tool at 29 and 49 euro tiers
Case Overview & Background
Cathy Kim, with no technical background, built three products with vibe coding. Soulin Social turns 50 to 150 words of raw thinking into 35+ platform posts. In March 2026 it had 2,900 euros MRR from 94 paying users, with 8.2% monthly churn.
How AI Is Used
Step-by-Step Process
She was spending 15 hours a week on content.
Cut from eight formats to five to improve quality.
About $47 a month to run.
Customer Acquisition & Distribution
Limitations, Risks & Failure Modes
What may not apply to you, and what could go wrong:
- Self-reported
- 8.2% monthly churn
- Two months of nightly sessions to reach production quality
Key Takeaways
- Publish your real costs
- Fewer, better features improve retention
- AI APIs can be cheap at small scale
Sources
Soulin: I Built 3 SaaS Products With Vibe Coding: Revenue, Costs, Lessons
Note: Founder's own blog with a cost table.
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