Cost per user
Cost per user
Know exactly what it costs to serve each customer. The number that determines if your business works.
For solo AI developers
Know what every user costs you.
Stop guessing your AI SaaS margins and runway. Track costs, revenue, and profitability across all your projects in one place.
Free to use · No credit card required · Built by a solo developer
Running an AI SaaS? You’re probably guessing.
- “How much does each user actually cost me?”
- “Will my margins survive if I grow 10×?”
- “Why is revenue up but profit isn’t?”
- “What happens if usage spikes tomorrow?”
- “When will I run out of money?”
Runway Ledger answers these. Instantly.
How it works
1
Connect your revenue
Link Stripe or add revenue manually. See what’s actually coming in.
2
Track your stack
Add your AI and infrastructure costs. Connect APIs for automatic sync.
3
See the truth
Know your cost per user, gross margin, burn rate, and runway. Every month.
The metrics that matter
Four numbers tell you whether your AI project is a business or a hobby. Runway Ledger surfaces all of them.
Gross margin
Gross margin
See if your pricing actually covers your costs. Stop flying blind on unit economics.
Monthly burn
Monthly burn
Track every dollar going out — by service, by project, by category. No surprises.
Runway
Runway
Know how many months you have left at current burn. Before it’s too late to act.
Costs less than one surprise API bill.
Personal
Freeduring beta
normally $5/month after beta
- Unlimited projects
- Cost and revenue tracking
- API auto-sync (Deepgram, ElevenLabs)
- Double-entry ledger view
- Yearly analytics
- Data export
- No credit card required
Free while we’re in beta. Will move to $5/month after launch. Early users get 3 months free.
About the founder
Built by a solo developer who got tired of checking 8 different dashboards to understand if their AI project was actually profitable.
Runway Ledger is what I built for myself. Now it’s yours.
— Runway Ledger, built in public 2026