weyt.ai, in plain words.
Raise your bar. Workouts that get smarter every time you lift, and the numbers to prove it.
What it is
A strength training app with a coach, on the web and as an iPhone app. Three answers at sign-up (what you train for, the standards and age to measure you against, what you train with) and the coach builds your first workout. You lift through it set by set or log it in two taps, and read the summary: today beside last time, the PRs, your targets for next time. You can also design a workout with the coach, build one by hand, read one from a photo, or add a popular one from Shared, where the weights are set from your own lifts. Every set feeds where you stand: a percentile against people your age, the age you lift like (your Weyt Age), the muscle groups you hit and the sessions you did, counted the same way every time.
The math
Your Weyt Age is the age whose median strength matches your current bench press and squat, estimated from the sets you log (no max-out testing). The headline is ranked against the general population using the Cooper Institute bench-press norms published in the ACSM Guidelines for Exercise Testing and Prescription; the subline against lifters who track using Strength Level community standards. There is no trustworthy squat data for the general population, so your squat is converted to the bench a lifter at the same level would press, and both are scored on that one scale. In the app one chest press or one squat is enough to show a first number; it settles over your first three workouts. The number reflects current form: an old best is gently discounted when you stop training that lift, so a recent PR moves it down and time off drifts it up. Under 25, the age keeps moving down with your ranking, to a floor of 18. The counts come only from your sets: a muscle group is hit this week when it got the sets it needs, and a week is full when you did the sessions you planned. The strength trend reads each lift's best lift estimate (an estimated one-rep max) over twelve weeks. No AI touches a number that ranks you.
The coach
The coach is Claude, made by Anthropic. It reads your numbers. After your workouts and on Sundays it writes one short read with one change to make. The coach button, in the middle of the tab row, opens it for anything else, and Design with coach writes a workout for what you have and what is in the way. Your first workout is built by the coach from your three answers. All of it is AI-generated fitness guidance, not medical advice.
Your data
Yours. No ads, nothing sold. The Weyt Age check at weyt.ai/weyt-age runs entirely in your browser. In the app, your training data is sent to Anthropic, the company whose AI writes the coach's replies, only to produce the coaching you asked for. Delete your account from Settings and everything goes with it. Details in the privacy policy.
Who
Built by one lifter who builds AI software by day and lifts at night, in Sunnyvale, California. No growth team, no marketing budget, and no testimonials or counts on the site because none exist yet.