Free founder tools
Home →49 free calculators and comparison tools to estimate cost, model unit economics, and make build decisions — from a dev who ships MVPs in 14 days. Need it built? Hire an MVP developer.
AI & agents
Scope, cost, and architect AI features before you build them.
AI Agent ROI Calculator
Free AI agent ROI calculator. Estimate return on investment of building an AI agent. Compare build cost vs labor savings, payback period, and 12-month ROI for your business.
Open tool →AI API Cost Calculator
Free AI API cost calculator. Compare pricing for OpenAI GPT-4o, Anthropic Claude, Google Gemini, and more. Estimate monthly and annual API costs based on your usage volume.
Open tool →AI Agent Framework Comparison
Free AI agent framework comparison tool. Compare LangChain, CrewAI, OpenAI Agents SDK, Google ADK, Microsoft Agent Framework, and Anthropic Claude SDK. Get a personalized recommendation based on your use case.
Open tool →RAG vs Fine-Tuning Tool
Free RAG vs fine-tuning decision tool. Answer 8 questions about your AI use case and get a scored recommendation with cost estimates, architecture diagrams, and implementation timeline.
Open tool →Chatbot ROI Calculator
Free chatbot ROI calculator. Estimate cost savings, payback period, and 12-month ROI for building a customer support chatbot. Compare current support costs vs chatbot automation.
Open tool →AI Readiness Assessment
Free AI readiness assessment for startups. Evaluate your data, team, infrastructure, and strategy across 8 dimensions. Get a personalized AI readiness score and action plan.
Open tool →AI Agent Cost Calculator
Free AI agent development cost calculator. Estimate build costs, monthly infrastructure, API expenses, and timeline for custom AI agents. Get instant pricing from $5K to $150K+.
Open tool →AI SaaS Pricing Calculator
Free AI SaaS pricing calculator. Calculate optimal pricing for your AI product based on API costs, infrastructure, margins, and market positioning. Get MRR and ARR projections instantly.
Open tool →AI Agent Architecture Planner
Free AI agent architecture planner. Answer questions about your use case, scale, and requirements to get a recommended architecture pattern with component diagrams, cost estimates, and implementation roadmap.
Open tool →AI Agent Use Case Finder
Free AI agent use case finder. Answer questions about your business processes and get scored AI agent opportunities ranked by ROI, feasibility, and implementation complexity.
Open tool →Vector Database Comparison Tool
Free vector database comparison tool. Answer 7 questions about your AI app and get a personalized recommendation across Pinecone, Weaviate, Qdrant, pgvector, Chroma, and Milvus with pricing and performance data.
Open tool →AI Agent Architecture Patterns
Compare 8 production AI agent architecture patterns side-by-side. See when to use single-agent, router, supervisor, hierarchical, plan-execute, reflection, ReAct, and swarm patterns.
Open tool →LLM Model Selector
Free LLM selector tool. Answer 6 questions about your product and get a scored recommendation across GPT-5, Claude Opus 4.6, Sonnet 4.6, Haiku, Gemini Pro, Gemini Flash, Llama 4, and Mistral Large.
Open tool →AI Coding Assistant Comparison
Free AI coding assistant comparison tool. Compare Cursor, Windsurf, GitHub Copilot, Claude Code, Cline, Aider, Codeium, and Tabnine. Get a personalized recommendation based on your workflow.
Open tool →AI Voice Agent Cost Calculator
Free AI voice agent cost calculator. Estimate build cost, per-minute pipeline cost, monthly ops bill, and payback period for production voice agents on Vapi, Retell, Bland, or custom stacks.
Open tool →
SaaS & finance
Model the unit economics investors actually look at.
Startup Runway Calculator
Free startup runway calculator. Enter your cash balance, monthly burn rate, and revenue to see exactly how many months of runway you have, when to start fundraising, and scenario analysis.
Open tool →SaaS Metrics Calculator
Free SaaS metrics calculator. Input your revenue data and instantly calculate ARR, NRR, LTV:CAC ratio, churn rate, quick ratio, and runway. Color-coded benchmarks tell you if each metric is healthy.
Open tool →CAC Calculator
Free CAC calculator. Compute customer acquisition cost, LTV:CAC ratio, and payback period for your SaaS or startup. See benchmarks and a clear health verdict in 30 seconds.
Open tool →SaaS Pricing Calculator
Free SaaS pricing calculator. Design 3-tier pricing, model take rates, and project MRR and ARR in 60 seconds. Built on value-based pricing best practices for B2B SaaS.
Open tool →Cofounder Equity Calculator
Free cofounder equity split calculator. Rate each founder across 7 contribution dimensions and get a data-driven equity split recommendation with vesting guidance.
Open tool →LTV Calculator
Free customer lifetime value (LTV) calculator. Compute predictive LTV, LTV:CAC ratio, and customer lifetime in 60 seconds. Built on SaaS benchmarks for B2B and PLG founders.
Open tool →Burn Multiple Calculator
Free burn multiple calculator built on David Sacks framework. Measure SaaS capital efficiency, get a health verdict, and see what investors expect at your stage.
Open tool →TAM SAM SOM Calculator
Free TAM SAM SOM calculator. Build a credible bottom-up market size for your pitch deck in 60 seconds. See investor benchmarks and a clear verdict on venture-scale fit.
Open tool →SAFE Note Calculator
Free SAFE note dilution calculator. Model how multiple post-money SAFEs convert at your priced round, see total founder dilution, and stress-test cap and discount scenarios.
Open tool →Rule of 40 Calculator
Free Rule of 40 calculator for SaaS founders. Add your growth rate and profit margin to see if you pass the 40 percent benchmark, with investor-grade verdicts and benchmarks.
Open tool →SaaS Magic Number Calculator
Free SaaS magic number calculator. Enter quarterly revenue and sales and marketing spend to measure go-to-market efficiency, with benchmarks and a clear scale-or-fix verdict.
Open tool →SaaS Gross Margin Calculator
Free SaaS gross margin calculator. Enter revenue and each cost of revenue line (hosting, AI APIs, payments, support) to get your gross margin, gross profit, and a benchmark verdict against best-in-class SaaS.
Open tool →
MVP & product
Plan, prioritize, and pressure-test your build.
MVP Cost Calculator
Free AI MVP cost calculator. Estimate the cost to build your AI-powered web app, mobile app, or SaaS MVP. Get instant pricing for chatbots, AI agents, custom models, and more.
Open tool →Build vs Buy Calculator
Free build vs buy software calculator. Compare the cost, timeline, and strategic fit of building custom software vs buying SaaS. Get a data-driven recommendation in 2 minutes.
Open tool →App Timeline Calculator
Free app development timeline calculator. Estimate how long it will take to build your web app, mobile app, or AI product. Get a realistic timeline range based on your scope and team.
Open tool →MVP Feature Prioritizer
Free MVP feature prioritization tool. Score features using RICE framework, get data-driven must-have vs nice-to-have recommendations, and scope your MVP in minutes.
Open tool →Tech Stack Recommender
Free tech stack recommender for startups. Answer 4 questions about your project and get a personalized technology stack recommendation with hosting costs, timeline, and scaling analysis.
Open tool →MVP Launch Checklist
Free interactive MVP launch checklist. 40+ tasks across pre-launch, launch day, and post-launch phases. Track your progress and never miss a critical step.
Open tool →React Native vs Flutter Tool
Free React Native vs Flutter decision tool. Answer 8 questions about your project and get a personalized framework recommendation with confidence score, comparison data, and pros/cons.
Open tool →Supabase vs Firebase Tool
Free Supabase vs Firebase decision tool. Answer 8 questions and get a personalized backend recommendation with pricing, feature comparison, and migration insights for your startup MVP.
Open tool →Product-Market Fit Score
Free product-market fit score assessment. Answer 6 questions and get a 0-100 PMF score with benchmarks, Sean Ellis test guidance, and a clear next-step recommendation.
Open tool →User Interview Question Generator
Free user interview question generator. Pick your stage, audience, and focus to instantly generate a personalized 12 to 15 question script for customer discovery interviews.
Open tool →Shopify App Revenue Calculator
Free Shopify app revenue calculator. Project MRR, ARR, install-to-paid conversion, Shopify take rate, and build payback for your public or custom Shopify app.
Open tool →A/B Test Sample Size Calculator
Free A/B test sample size calculator. Enter baseline conversion, minimum detectable effect, significance, and power to see exactly how many visitors per variant you need before you can call a winner.
Open tool →Pitch Deck Score
Free pitch deck score assessment. Rate your deck across 10 dimensions (problem, traction, GTM, team, ask) and get an investor-readiness score with a clear next-step recommendation.
Open tool →App Maintenance Cost Calculator
Free app maintenance cost calculator. Estimate the annual cost to maintain your web or mobile app across bug fixes, hosting, integrations, OS updates, and security. See the breakdown in 60 seconds.
Open tool →Free Trial Conversion Calculator
Free trial conversion rate calculator. Enter your trial signups, conversion rate, and pricing to project new paying customers, MRR, ARR, and the revenue value of every extra point of conversion.
Open tool →Mobile App Cost Calculator
Free mobile app development cost calculator. Estimate the cost to build your iOS, Android, or cross-platform app based on type, platforms, design, and backend. Get a realistic cost range, timeline, and maintenance budget in 60 seconds.
Open tool →Churn Rate Calculator
Free SaaS churn rate calculator. Compute customer churn, gross revenue churn, net revenue churn, retention, and average customer lifetime. Benchmark your rate by segment and see what it costs you in lost ARR.
Open tool →Net Revenue Retention Calculator
Free net revenue retention (NRR) calculator. Compute NRR and GRR from your starting MRR, expansion, contraction, and churn. Benchmark by segment and see your annualized retention.
Open tool →DAU/MAU Ratio Calculator
Free DAU/MAU ratio calculator. Measure product stickiness, see how many days a month your average user is active, and benchmark engagement by app category.
Open tool →Stripe Fee Calculator
Free Stripe fee calculator. Enter your transaction amount and monthly volume to see exact Stripe fees, your real effective rate, monthly net payout, and how much to charge to net a target amount.
Open tool →App Store Fee Calculator
Free app store fee calculator. See exactly what Apple App Store and Google Play take from every sale, your net payout after the 15 to 30 percent commission, and how much to charge to net a target amount.
Open tool →Shopify Fee Calculator
Free Shopify fee calculator. Add up your plan subscription, payment processing, and third-party transaction fees to see your true cost per order, monthly net revenue, and the cheapest plan for your volume.
Open tool →
Done estimating? Let’s build it.
Fixed-price 14-day sprints. You own the code from day one.
Stay ahead on AI.
I build with AI every day. I will send you what is worth knowing and what is not worth your time.