# MustDuo — Workout tracker with AI coach > AI-powered fitness app for personalized workouts, tracking, and habit building. (iPhone/iPad app by MustDuo.) - Source: https://appshunter.io/ios/app/mustduo/id6749694909 (this page in markdown: same URL + `.md`) - Developer: [MustDuo](https://appshunter.io/developer/1831771141) - Category: Health & Fitness, Lifestyle - Price: Free - Rating: 5.00/5 from 9 App Store ratings · 6 written reviews indexed - Age rating: 12+ - Requires: iOS 18.5 · 51 MB - Languages: American English - Released: 2026-05-19 - Data updated: 2026-09-17 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/mustduo/id6749694909/reviews.md ## What is MustDuo? Built for the gym you actually go to. Someone's on the squat rack? Tell Naya and she swaps the movement on the spot. Only got twenty minutes? She shortens the session. Running on four hours of sleep? She lightens the day. Naya is your AI coach. Chat with her like a friend who has read your whole training log. She knows your plan and every set you have logged, and the plan gets sharper the more you lift, because Naya remembers what you did, not what you meant to do. YOUR PLAN, YOUR WEEK Pick a goal (build muscle, lose weight, and more), your level, and the days you can train. MustDuo builds your weekly plan and lays it out as a journey map of the week. When the gym does not cooperate, chat with Naya and tap a card to apply the change: swap an exercise, shorten a session to the minutes you have, make a day lighter, move a workout to another day, set a rest day. NAYA WORKS MID-WORKOUT (NEW IN 1.6) Rack or machine taken? Tell Naya during the workout. She picks the alternative for you, same muscle, different equipment, and swaps it in on the spot. The sets you already logged stay exactly as they are. THE WORKOUT SCREEN Sets and reps prefilled from your plan. Tap through a set to log it as planned. Rest timer, elapsed time, and timers on your lock screen and in the Dynamic Island. Audible cues with the screen locked. Phone stays in your pocket. HONEST REPS (NEW IN 1.6) After each exercise, one tap confirms it: "8 reps each set?" Yes, or Edit to fix every set at once. Your charts only get better when the numbers are real. PROGRESSIVE OVERLOAD, HANDLED MustDuo remembers what you lifted and nudges the weight up over time, per exercise and per equipment. You show up. The numbers climb. THE PROGRESS DASHBOARD (NEW IN 1.6) A strength chart for every lift: your heaviest set per workout, plus an estimated max line once your reps are measured. Weekly sets per muscle against the productive 10 to 20 range. A consistency ring. And one honest headline about what to fix next, like "Barbell Row has not moved in three sessions." A RECEIPT FOR EVERY WORKOUT Volume lifted, reps, time, and a real-world comparison ("about ten thousand rotisserie chickens"). New in 1.6: "Vs last time" shows how today stacked up against the last time you ran the same workout. Share it. THE WINS TAB Receipts, streaks, personal records, levels, and bananas (in-app reward points). Bring a friend with the in-app referral. THE OPTIONAL MUSTDUO TRACKER Pair the MustDuo tracker accessory (Bluetooth) and your reps count themselves. Don't have one? The app is fully functional without it. ALSO • Exercise library with videos and muscle tags • Add, replace or remove exercises yourself. Naya is a coach, not a babysitter. • Full workout history • Optional Apple Health access • Delete your account in-app, any time TRY IT FIRST Do 3 workouts as a guest before creating an account. Just lift. MustDuo handles the rest. ## Key features - Smart workout tracking - Personalized workout plans - AI fitness coach - Habit building features - Gamified fitness experience - Progress analytics ## Recent user reviews (6 of 6) All indexed reviews: https://appshunter.io/ios/app/mustduo/id6749694909/reviews.md ### 5/5 — Naya is cute *2026-08-27* I like that Naya pushesh you and keeps you accountable. I also like the demo videos that show you how to perform every exercise ### 5/5 — Wonderful and fun experience *2026-08-23* They just added custom templates which is my favourite, and Naya makes it cute ### 5/5 — It does the thinking for you *2026-08-23* I love how easy it is to modify the workout and how it does the thinking for you. It’s nice to not have to remember or manually log everything. I’m finally making noticeable progress in the gym. Plus it’s fun to use:) ### 5/5 — User friendly and great exercise bank! *2026-08-23* App is fun, easy to use and log workouts in, great bank of exercises! ### 5/5 — Great workout companion *2026-08-23* very good for tracking and managing my workouts ### 5/5 — I love how quick it is to setup *2026-06-26* The gamification factor and the quick setup makes it really easy to use. ## Frequently asked questions about MustDuo ### What is MustDuo? MustDuo is a fitness app designed to help users build consistency, hit their goals, and stay accountable. It offers real-time tracking, personalized plans, and AI-powered coaching. ### Does MustDuo have ads? No, MustDuo is ad-free, allowing for an uninterrupted fitness experience. ### What devices does MustDuo support? MustDuo is currently supported on iPhone devices. ### What is the age rating for MustDuo? MustDuo has an age rating of 12+, making it suitable for teenagers and older. ### How often is MustDuo updated? The latest version of MustDuo is 1.2, and it was last updated on June 27, 2026. Updates ensure the app remains reliable and features are improved. ### What are the key features of MustDuo? Key features include smart workout tracking, personalized workout plans, an AI fitness coach named Naya, habit-building tools, a gamified experience, and progress analytics. ### What is the user sentiment for MustDuo? Based on the available data, MustDuo has a perfect 5.0-star rating from 2 reviews, indicating very positive user sentiment. ### Is MustDuo free to use? Yes, MustDuo is available for free, with no cost to download or use its core features. ## Version history (last 5 releases) ### 1.6 — 2026-09-02 1.6: Naya joins you mid-workout. Also new: • Progress dashboard. A strength chart for every lift (heaviest set per workout, plus an estimated max line once your reps are measured), weekly sets per muscle against the productive 10 to 20 range, a consistency ring, and one honest headline about what to fix next. Like "Barbell Row has not moved in three sessions." • One-tap rep confirmation. After each exercise: "8 reps each set?" Yes, or Edit to fix every set at once. Your charts stay honest. • Vs last time. Every session receipt now compares this workout to the last time you ran the same one. • Home Screen widget. "Your week" shows what you are training today and the week so far, in small and medium sizes. • Sign in with Apple and Google. One tap, no password to remember. Fixes: • Resumed workouts no longer lose paused time. • Chart picker fixed. • Home header now sits right on every screen size. Just lift. MustDuo handles the rest. ### 1.5 — 2026-08-22 Naya can change your workout now. Tell her what equipment you have, how long you've got, or that you're sore, and she'll rework the session and show you exactly what changed before you accept it. Your weights move on their own. Finish what was asked and the next session asks for a little more, and tells you why. Also new: • Rest timer on your lock screen and Dynamic Island • A Wins tab with session cards you can share • The main and secondary muscle on every exercise • Tap any exercise photo to watch the demo • Streaks, bananas, and a panda you can dress • Better tracker reconnection, and support for the latest firmware Plus a long list of fixes to session timing, weights and workout editing. ### 1.4 — 2026-07-18 Minor bug fixes ### 1.3 — 2026-07-09 Minor updates ### 1.2 — 2026-06-27 Minor bug fixes ## Apps similar to MustDuo | App | Rating | Price | Category | | --- | --- | --- | --- | | [Sage - Breathing Exercises](https://appshunter.io/ios/app/sage-breathing-exercises/id6467432225) | 5.0 (1) | Free | Health & Fitness | | [Calibrex](https://appshunter.io/ios/app/calibrex/id6741951538) | 3.7 (11) | Free | Health & Fitness | | [Level Up Fitness: Get Moving](https://appshunter.io/ios/app/level-up-fitness-get-moving/id6711331456) | 5.0 (5) | Free | Health & Fitness | | [My MNRI](https://appshunter.io/ios/app/my-mnri/id6738663219) | — | Free | Health & Fitness | | [Gorilla Fitness-Smart Workouts](https://appshunter.io/ios/app/gorilla-fitness-smart-workouts/id1599374927) | 4.8 (121) | Free | Health & Fitness | | [Varro: Ranked Gym Tracker](https://appshunter.io/ios/app/varro-ranked-gym-tracker/id6754757538) | — | Free | Health & Fitness | --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-17.*