Workout tracker & AI fitness coach
Isofit is a workout tracker that helps you make sense of your training. Log by tap, text or voice, and see which muscles you’re working—and which you might be overlooking. Meet Atlas, Isofit’s built-in personal AI fitness coach. With your permission, Atlas reads your workout history to help you review sessions and plan what’s next.
Available on the App Store and on the web.
The app
Isofit has four parts, one per tab in the app: a logger that takes taps, typed lines or your voice; a body graph of the muscles your sets reached; Atlas, an AI coach; and Bonfire, a members-only community feed.
01 · Log it
Every exercise is a row with the numbers that fit it: sets, reps and weight, distance and time, or a hold, plus RPE. Type one Quicklog line such as "bench 5x5 225lbs" and get finished rows, parsed on your phone with no signal needed. Or say the session and review the draft before it saves.
Back Squat, Overhead Press and Incline Bench rows typing themselves in on a loop.
02 · See it
Every working set you log counts toward the muscles it trains, and the body graph shades a front and back figure by that count over 7, 30 or 90 days or all time. The muscles with the most credited work read warmest; those with relatively little stay pale. It counts logged work, not recovery. The full graph is part of Pro.
03 · Ask Atlas
Atlas is a chat coach inside Isofit. Ask it to review a session, explain a stalled lift or plan next week. Turn on personalization and it answers from your own training history; leave it off and it gives general guidance. It does not give medical advice.
04 · Bonfire
Bonfire is a members-only feed with one post a day per member, with no follows, groups or direct messages. Your log stays private unless you choose to post it.
Differences
Compared with Hevy, Strong, Fitbod and JEFIT as each describes itself, read October 17, 2026. Those four are released, run on Android and a watch, and most cost less.
Type "bench 5x5 225lbs" or say the session. None of the four advertises typed or voice logging.
Atlas is a chat coach built into Isofit. Hevy's chat runs inside ChatGPT; Strong, Fitbod and JEFIT advertise no chat.
The body graph looks back 7, 30 or 90 days or all time. Hevy's heat map covers the last 7 days.
Nearly 500 exercises across lifting, cardio, yoga, sports and martial arts, plus add unlimited custom exercises. The four describe themselves as strength-first or strength-focused.
Bonfire allows one post a day, with no follows. Hevy's feed is built on follows, with leaderboards.
Pricing
Independent by design · Founded in 2026
An Hu
Founder, designer & developer
I founded Isofit to make workout logs useful beyond the workout. I design and build the app myself, working between New York City and Philadelphia.
I wanted to see my progress, understand where my effort was going, and know whether my program was actually working.
I’m also a new father. Most of Isofit was built during nap time.
Atlas · AI coach
Review a session or plan your next week. With your permission, Atlas can use your workout history.
What Atlas does and what it seesYour data
Your log is private by default. You choose what to share and can export your data.
Privacy PolicyQuestions
Isofit is a workout tracker for iPhone and the web. You record training by tapping, typing or speaking, and the app shows which muscles that training reached on a front and back body graph. It includes Atlas, a personal AI fitness coach that can read your workout history with your permission, and Bonfire, a members-only community feed.
Logging workouts, routines, history, Apple Health import, data export and 10 Atlas messages a month are free. Pro is $14.99 a month or $124.99 a year in the US App Store and unlocks the full body graph, higher Atlas limits, Atlas programs and posting to Bonfire.
See what each tier includesIsofit is on the App Store for iPhone (iOS 17.6 or later), and there is a web app at app.isofit.app. There are no native Android, iPad or Apple Watch apps.
Available on the App Store and on the web. Download it from the App Store, or open the web app in your browser.
Facts on this page were last reviewed . Details can change as Isofit updates. Read this page as markdown.
Available on the App Store and on the web.
Your workouts, working for you.
Download Isofit from the App Store for iPhone, or use the web app in your browser.
