Tools
200 free calculators for the arithmetic behind running language models. They work on numbers you type, in your browser, with no account.
Cost and budget calculators
Calculators that take your own rates and your own volumes and give you a number you can defend — every price is a field you type, so nothing here goes stale and nothing here is anyone else's guess at what you pay.
Token and text tools
Counting, splitting, budgeting and comparing text in the unit you are billed in — every calculation in your browser, every estimate labelled as one.
Converters and generators
One format in, another out — schemas, tool definitions, requests, prompts and templates — each with a printed list of everything that had no equivalent, instead of a silent drop.
Validators, testers and debuggers
Paste the thing that broke and find out where. Every check runs in your browser on text you bring, points at a line and column, and says which parts of the spec it actually verified.
Interactive explainers and simulators
Mechanisms you can move: the arithmetic inside a transformer, a real softmax over scores you set, a BPE trained on your own text, and a retrieval pipeline that shows you which chunk it lost. Nothing here calls a model, so nothing here is invented.
Sizing and capacity planners
Work out how much memory, how many GPUs, how much concurrency and how much queue a workload needs — from the formulas, with every term a field you control.