Comparison

Epilog vs Kaizen

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Epilog

Track your weightlifting progress with detailed metrics like weight, reps, and tempo. Analyze your performance muscle by muscle and set up circuit training routines. Measure body composition and sync with Apple Health.

Highlights
  • Record sets, reps, tempo, and rest
  • Analyze progression by muscle group
  • Create and track circuit training
  • Estimate 1RM and track volume
  • Log body measurements and photos
  • Exercise library with animations
Features
Read full description

The workout tracker that shows you're making progress. Epilog logs every set in seconds (weight, reps, tempo, RPE) and turns your workouts into a clear read on your progress, exercise by exercise and muscle by muscle. LOG FAST, STAY IN THE ZONE • Check off a set and the rest timer starts on its own • Rest timer on the Dynamic Island and the Lock Screen • Supersets, drop sets, warm-up sets and sets to failure • Tempo, RPE and notes on every exercise • Reorder or swap exercises in one tap YOUR PROGRESS, MUSCLE BY MUSCLE • See how much work each muscle gets, week after week • A muscle map shows where you train hard and where you lag behind • Every exercise has its own curve: estimated 1RM, top set, volume, reps • Personal records detected automatically and kept with their date 300+ EXERCISES, EXPLAINED • Instructions and common mistakes for each movement • Filter by muscle and equipment • Can't find one? Create your own CIRCUITS AND ROUTINES • HIIT circuits on the clock, EMOM, AMRAP, or free rounds • Build your routines, sort them into folders, and start from ready-made programs TRACK MORE THAN THE BAR • Body weight, body fat and circumferences, charted over time • Progress photos, compared side by side (Pro) • Calculators built in: plates, 1RM, percentage of 1RM, RPE, warm-up sets • Streaks and achievements to keep you coming back MADE FOR IPHONE • Home Screen widgets • Apple Health sync • Kilograms or pounds • Available in 12 languages ON APPLE WATCH (FIRST RELEASE) • Follow your workout and log your sets from your wrist • Rest timer and live heart rate Epilog is free to use, with unlimited workout logging. Go Pro for your full history, every stat and widgets. Try Pro free for 14 days. Download Epilog and make every workout count. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Kaizen

Features
Read full description

Science-based lifting, built on progressive overload. Kaizen is a strength training tracker built around one idea: get a little better every week. Log your sets, and Kaizen tells you what to lift next time. No guesswork, no spreadsheets. KNOW WHAT TO BEAT Every set shows your target from last time. Hit the top of your rep range on every set and Kaizen adds weight. Fall short and it holds the load until you get there. That's double progression, the method coaches use, done for you. TRAIN BY EFFORT Rate each set with RPE (rate of perceived exertion). Kaizen uses it to calibrate your starting weights in week one, to adjust your targets, and to warn you when you're pushing too hard. BUILD ANY SPLIT Push Pull Legs (same days twice or A & B versions), Upper / Lower, Full Body, Bro split or your own. Pick your exercises, set your sets, and put your weak point first. SEE YOUR PROGRESS • Estimated 1RM, top set and volume charts for every lift • Personal records by rep count • Hard sets per muscle each week • A month view of every session and deload week FIX PLATEAUS EARLY When a lift stalls for three sessions, Kaizen spots it and gives you clear options: reset the reps, take a deload week or swap the exercise. DAILY CHECK-IN Thirty seconds each morning: bodyweight, sleep, energy and soreness. Kaizen turns it into a readiness score, so you know when to push and when to ease off. PRIVATE BY DESIGN Your body data (weight, height, body fat, sleep, energy, soreness) stays on your iPhone. Your workouts sync to your account so you never lose them. Delete your account and data at any time from Settings. Light and dark mode. Available in English and French. KAIZEN PRO Start with a 7-day free trial. Then choose monthly, 3 months, yearly or a one-time lifetime purchase. Prices are shown in the app in your local currency. Payment is charged to your Apple ID account when you confirm the purchase, or at the end of the free trial. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours before the end of the current period. You can manage or cancel your subscription in your App Store account settings at any time. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://kaizen.dbsq.fr/privacy/

Screenshots

Epilog4 screens
Kaizen4 screens

Verdict

The call

The clearest difference is update cadence: Kaizen at every 2 days against Epilog's every 6 days. Epilog's advantage is iOS requirement (15.1 vs 26.1). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Epilog sells 6 in-app purchases, starting at $4.99 per month and Kaizen sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Epilog ships an update every 6 days, Kaizen every 2 days. Both last shipped on October 31, 2026.

Scorecard2 real differences · 8 level
Epilog versus Kaizen: the parameters behind the verdict, then further details
ParameterEpilogKaizen
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews90.5% of reviews—
Number of ratings2 — better—
Update frequencyEvery 6 daysEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPod, Apple WatchiPhone, iPad, Apple Watch
Requires iOS15.1 — better26.1
Further details — not scored
Size115 MB13 MB
Age rating4+12+
DeveloperFit MassNoe DUBOSQ

In-app purchases

6 purchases

Epilog

Subscriptions6
  • Epilog Pro (Mensuel)14 Days trial$4.991 Month
  • Epilog Pro (Monthly)7 Days trial$6.991 Month
  • Epilog Pro (Monthly)14 Days trial$6.991 Month
Show 3 more
  • Epilog Pro (Annual)14 Days trial$22.991 Year
  • Epilog Pro (Annual)7 Days trial$29.991 Year
  • Epilog Pro (Annual)14 Days trial$29.991 Year
1 purchases

Kaizen

One-time1
  • Kaizen pro lifetime$59.99

Questions

Is Epilog free?
Epilog is free to download, with in-app purchases available.
Is Kaizen free?
Kaizen is free to download, with in-app purchases available.
Do Epilog or Kaizen have ads?
Neither Epilog nor Kaizen shows ads.
Which is updated more often, Epilog or Kaizen?
Epilog ships an update every 6 days, and Kaizen every 2 days. Most recently, Epilog was updated on October 31, 2026 and Kaizen on October 31, 2026.

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