Stateless SaaS metrics calculator API. POST your numbers, get back LTV, CAC, MRR, ARR, runway, churn, payback period, quick ratio — no database, no signup, no guessing.
Triggered by Reddit signal: "I built 200+ SaaS calculators because I was tired of guessing pricing, LTV, CAC, runway and more" (r/SaaS, 2026-03-09, score +5)
Founders waste hours in spreadsheets computing the same 8 metrics every month. Tools like Baremetrics cost $200+/mo. Most founders just guess. SaasCalc gives you an embeddable, self-hosted API for every key metric — call it from your dashboard, CLI, or Notion integration.
| Segment | Size | Notes |
|---|---|---|
| TAM — SaaS analytics & metrics tools | $8.3B (2026) | Gartner SaaS management platform market |
| SAM — Indie founders and small SaaS teams | $740M | 2M+ active indie SaaS founders worldwide |
| SOM — Self-hosted / API-first segment | $29M | Dev-first, embed in existing dashboards |
| CAGR | 22% | Driven by SaaS-as-default and indie hacker growth |
| Tool | Strength | Weakness |
|---|---|---|
| Baremetrics | Beautiful UI, Stripe integration | $250/mo, cloud-only, no API |
| ChartMogul | Enterprise features | $100+/mo, complex setup |
| ProfitWell | Free tier | US-only billing integrations, no self-host |
| Notion/Airtable calculators | Familiar UI | Manual, no automation |
| Custom spreadsheets | Free | Error-prone, not shareable |
| SaasCalc | API-first, stateless, free | No UI (by design) |
- Stateless API — no database, no auth, no vendor lock-in; call from any stack
- All metrics in one call — returns LTV, CAC, LTV/CAC, runway, payback, ARR in one POST
- Rated outputs — every metric includes a human-readable rating (excellent/good/needs_improvement) based on SaaS benchmarks
| Metric | Value |
|---|---|
| Pricing | Free open-source + hosted plan at $19/mo (rate limits + HTTPS) |
| COGS | $2/mo (stateless, tiny infra) |
| Gross margin | 90% |
| Target customers | Indie SaaS founders, no-code builders, finance teams |
| LTV (24-month) | $456 |
| CAC target | $40 (dev content, HackerNews) |
| LTV/CAC | 11.4x |
| Criterion | Score | Notes |
|---|---|---|
| Pain urgency | 4/5 | Founders compute these manually every month |
| Market size | 4/5 | Every SaaS founder is a potential user |
| Build barrier | 3/5 | Pure math, no ML or infra complexity |
| Competition | 3/5 | Baremetrics is expensive, no free API alternative |
| Monetization | 4/5 | Easy freemium to paid for hosted version |
| Total | +5 | Threshold met |
| Method | Path | Description |
|---|---|---|
| POST | /calc/ltv | LTV = ARPU / churn * gross_margin |
| POST | /calc/cac | CAC = spend / new_customers |
| POST | /calc/mrr | MRR + ARR from customers * ARPU |
| POST | /calc/runway | Runway months from cash / burn |
| POST | /calc/payback | CAC payback months |
| POST | /calc/churn | Monthly + annual churn rate |
| POST | /calc/quick-ratio | Growth efficiency ratio |
| POST | /calc/all | All metrics in one call |
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