Free, interactive tools
Small, sharp tools that answer a real question, across AI, startups, engineering, learning, and a few big questions about time and the cosmos. No signup, runs in your browser.
AI & LLMs
Can I run this LLM? (VRAM)
GPU memory a model needs, whether it fits your card, and how many GPUs. With a shareable result card.
Token Counter & Cost
Estimate tokens and cost across GPT, Claude, Gemini, GLM-5.2, DeepSeek and more.
LLM Comparison
The major models side by side: price, context, parameters, open vs closed. Sortable.
Head-to-Head (X vs Y)
Pick any two models for a focused side-by-side comparison.
LLM Cost Calculator
What an AI feature costs per finished task, comparing two models.
Agent Cost Simulator
Cost per finished task across multi-step loops, carried context, and retries.
Self-Host vs API
Should you run an open model yourself or pay per token? Find the break-even.
MCP Server Directory
The most useful Model Context Protocol servers, grouped by what they do.
Startup & founder
Equity & Dilution
What your ownership becomes after seed, A, B and an option pool, and its value at exit.
Runway & Burn
Net burn, months of runway, and when to start raising.
SaaS Metrics
ARR, LTV, LTV:CAC, CAC payback, and the Rule of 40.
Stock Option Value
What your options clear after exercise across exit prices.
Engineering
Learning & growth
Life & you
Wheel of Life
Rate eight areas of your life and see the balance at a glance.
Financial Independence (FIRE)
Your "enough" number and the years until work is optional.
How Rich Are You, Really?
Where your income lands among everyone alive.
How You Spend Your Life
The years you give to sleep, work, screens, and what is left.
The Tail End
How many times you may have left with someone you love.
Big questions
Your Life in Weeks
Your whole life as a grid of weeks, lived and remaining.
Exponential Intuition
Fold a paper to the Moon and feel why exponentials break the brain.
The Birthday Paradox
Why just 23 people make a shared birthday likely.
Drake Equation
Estimate how many civilizations might be out there.
Kardashev Scale
Rank a civilization by the energy it can harness.
Cosmic Calendar
All 13.8 billion years of time compressed into one year.
p(doom) Estimator
Turn your assumptions about AI risk into a rough probability.