Practical guides for
AI builders & SaaS operators
No fluff, no AI-generated filler — just the formulas, benchmarks, and reasoning behind the numbers our calculators produce.
AI API Token Costs Explained: How GPT, Claude & Gemini Pricing Actually Works
A practical breakdown of how LLM API pricing works, what actually drives your bill up, and how to estimate and cut costs across GPT, Claude, Gemini, and DeepSeek.
LLM Context Windows Explained: How Much Can You Actually Fit in a Prompt?
What a context window really measures, how system prompts, chat history, and RAG chunks eat into it, and how to avoid silent truncation and overflow errors.
MRR vs ARR: The Complete Guide to SaaS Revenue Metrics
How MRR and ARR are calculated, when to use each, and how to break revenue down into new, expansion, contraction, and churned MRR for an accurate growth picture.
What Is a Good LTV:CAC Ratio? A Founder's Guide to SaaS Unit Economics
How to calculate customer lifetime value, CAC, and payback period — and the LTV:CAC benchmarks investors actually look for at each stage of growth.
Burn Rate and Runway: How to Calculate How Long Your Startup Has Left
Gross burn vs net burn, how to calculate runway correctly, and the warning signs that tell you it's time to start fundraising — explained with real formulas.