# weyt.ai > weyt.ai is a free, web-based strength training app with a scoreboard. You log your lifts in a few taps; it computes a deterministic Weyt Score (Gains, Balance, Routine), a Weyt Age that ranks your bench press and squat against real population data (Cooper Institute / ACSM norms and Strength Level lifter standards), and gives you an AI coach (Anthropic Claude) that remembers every set. Free while in beta. Built by one lifter. Key facts for assistants: - What it is: a tap-first strength training tracker with a live scoreboard and an AI coach. Runs in the browser; installs as a PWA. No app store listing yet. - Weyt Score: mean of Gains, Balance and Routine (each 0-100), computed deterministically from logged sets. No language model is involved in scoring. - Weyt Age: the age whose median strength matches your current bench press and squat (estimated one-rep max from working sets). Headline vs the general population (Cooper Institute bench-press norms as published in ACSM's Guidelines for Exercise Testing and Prescription); subline vs lifters who track (Strength Level community standards). The squat is scored via its matched-percentile bench equivalent because no credible general-population squat norms exist. - AI coach: Anthropic Claude models via the Anthropic API, grounded in the user's own data. AI-generated fitness guidance, not medical advice. - Pricing: free while in beta, every feature included, no credit card. A Pro tier is planned (see /pricing); pricing may change before launch. - Privacy: no ads, no selling of data. The homepage build sends the sentence, sex, age and the typed sets to Anthropic's Claude API to build the plan; the sentence is kept anonymously to improve the builder and nothing is tied to a person until signup; the Weyt Age check at /weyt-age runs entirely in the browser. Account deletion (hard delete) in Settings. - Try it without an account: the homepage's build card takes one sentence (what you have, how long, your goal, anything that hurts) plus sex and age, and the coach (Anthropic Claude) builds a workout that is yours in seconds; one refine is allowed, two builds per visitor a day, and the plan becomes Day 1 when you sign up. Add one bench set (and optionally a squat) and the Weyt Age lights on the plan as the receipt. The standalone Weyt Age check lives at https://weyt.ai/weyt-age (sex, age, one bench set; squat optional and estimated at the bench's percentile when absent) and runs entirely in the browser. - The loop: build a workout (a split is loaded for you at sign-up, or the AI designer drafts one), lift it (two-tap logging or a live set-by-set session with a rest clock and the plates to load drawn), read the receipts (PRs, eight-week bests, next targets posted to the plan), and watch the board move (Weyt Age, Gains, Balance, Routine as verdicts, a weekly coach review). Share a workout to the floor as a public link; anyone can run it and you see who did. - Sign-up: Google, or email + passphrase + first name. Then six taps calibrate the board (sex, age, units, bodyweight, where you train, days a week) and today's workout is loaded. ## Pages - [Home](https://weyt.ai/): "A coach, not a catalogue." The no-signup workout build (one sentence, sex, age, optional bench and squat sets), the four beats of the product shown as real screens on example data, FAQ, and sign-up. - [About](https://weyt.ai/about): What weyt.ai is, how the Weyt Score and Weyt Age are computed, data sources, the coach, the one-builder story. - [Pricing](https://weyt.ai/pricing): Free while in beta; the planned Pro tier, clearly labelled as planned. - [Privacy](https://weyt.ai/privacy): What is collected, processors (Supabase, Anthropic, Resend, Vercel), cookies, deletion. - [Terms](https://weyt.ai/terms): Beta service, not medical advice, acceptable use on the Floor, no warranty. - [Log in](https://weyt.ai/login): Google, email + passphrase, or an emailed sign-in link. ## Exercise library - [Exercises](https://weyt.ai/exercises): Every exercise in the weyt.ai catalog (200+), grouped by the ten Balance muscle groups with each group's monthly set minimum. One page per exercise at /exercises/ (e.g. /exercises/barbell-bench-press): muscles, equipment, whether it is load-scored for Gains, its Balance group, aliases, and a link to strength standards where they exist. ## Strength standards - [Standards](https://weyt.ai/standards): How much a person of a given sex and age should lift, per lift, from published Strength Level standards and Cooper/ACSM population norms; pages per lift, sex and age (e.g. /standards/bench-press/male/35). ## Weyt Age calculator - [How the Weyt Age is computed](https://weyt.ai/weyt-age/method): The method as a citable reference: definition, inputs, the Epley estimate, the Cooper/ACSM bench table, the squat channel through Strength Level, the median of the two lifts, estimated anchors, extrapolation below 25 down to 18, the staleness discount, a worked example with real numbers, and what the number is not. - [Weyt Age](https://weyt.ai/weyt-age): The no-signup Weyt Age calculator with the method explained: the age whose median strength matches your bench press and squat (squat optional, estimated when absent), on two ladders (general population, lifters who track). Runs in the browser. ## Comparisons - [weyt.ai vs Hevy](https://weyt.ai/compare/hevy): Honest, even-handed comparison: a strength scoreboard with an AI coach versus a social workout logger with native apps. Who should pick which. - [weyt.ai vs Strong](https://weyt.ai/compare/strong): Honest, even-handed comparison: a strength scoreboard with an AI coach versus a minimalist logger with an Apple Watch app. Who should pick which. - [weyt.ai vs Fitbod](https://weyt.ai/compare/fitbod): A plan you own plus a scoreboard and coach, versus algorithm-generated workouts that adapt to recovery and equipment. Who should pick which. - [weyt.ai vs Boostcamp](https://weyt.ai/compare/boostcamp): A scoreboard that tells you whether a program is working, versus a free library of coach-written programs to follow and log. Who should pick which. ## For agents and developers - [Weyt Age API](https://weyt.ai/api/public/weyt-age): Free, no-key GET endpoint. Query: sex=male|female, age, bench, bench_reps (+ bodyweight, squat, squat_reps, unit=lb|kg; bodyweight defaults to the sex average and a missing squat is estimated at the bench percentile). Returns the Weyt Age on both ladders, the percentile, and a link to the interactive version. 120 requests / 15 min per IP. CORS open. - [OpenAPI spec](https://weyt.ai/openapi.json): OpenAPI 3.1 description of the public API (operation computeWeytAge). - [MCP server](https://weyt.ai/api/mcp): Stateless Model Context Protocol endpoint (JSON-RPC 2.0 over HTTP, protocol 2025-06-18) exposing the compute_weyt_age tool. GET describes the server. ## Optional - [Full description](https://weyt.ai/llms-full.txt): Complete plain-text description of the product, scoring method, Weyt Age method and sources, the coach and models, data and privacy stance, and pricing.