Comparison

BYLD vs FFMI Calc

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

Head to head
About

BYLD

Read full description

Build Muscle Without Guesswork BYLD is a hypertrophy-focused workout tracker that shows how much effective training each muscle gets and how it compares with personalized weekly targets. Log your workouts, track your progress, and see where your training stands — so you can spend your effort where it matters. Know What Each Muscle Needs BYLD goes beyond counting workouts and raw sets. • Track weekly training for individual muscles • See personalized muscle targets based on your training level and goals • Measure training using effective sets, not just total sets • Account for exercise muscle contribution and training effort • See which muscles need more work and which are already covered • Explore exactly which workouts, exercises, and sets contributed to each muscle • Visualize your weekly muscle coverage on an interactive body map • Review previous weeks and monitor your consistency over time Track Every Workout Everything you need for day-to-day gym tracking: • Log sets, reps, weight, and optional RIR • Create and edit your own workout routines • Start a workout from a routine or from scratch • Add, replace, remove, and reorder exercises while you train • Edit sets at any point during your workout • Resume an active workout whenever you come back • Review and edit your workout history See Your Progress Keep track of how your training is evolving. • Follow your weekly and monthly workout activity • Track training volume, reps, and workout duration • View progress by muscle group and individual exercise • See your previous performance before your next set • Jump directly from exercise history into past workouts Train Your Way • Browse exercises by muscle and equipment • Watch exercise demonstration videos • Use metric or imperial units • Build routines around the exercises and equipment you prefer • Train with a clean, distraction-free interface BYLD is designed for lifters who want more than a workout log — and want to know whether their training is actually aligned with their muscle-growth goals. Some hypertrophy insights and advanced features require a BYLD Premium subscription. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

FFMI Calc

Features
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■ Main Features Instant FFMI & Normalized FFMI Calculation Simply enter your height, weight, and body fat percentage to instantly calculate your Fat-Free Mass Index (FFMI) and "Normalized FFMI," which adjusts for height differences to ensure a fair evaluation. [NEW] Target FFMI Reverse Simulator "What changes do I need to make to reach a Normalized FFMI of 22?" Just set your target value, and the app automatically generates a "Body Fat % and Target Weight combination list" based on your height. It strongly supports your specific goal setting, from bulking up to cutting, by factoring in body fat fluctuations. Classification Rank Display Based on your calculated values, it provides intuitive feedback on where your muscle mass ranks, from below average up to the "God-like" level. Global Support Full compatibility with both Metric (cm/kg) and Imperial (ft/lbs) systems. It also supports multiple languages (Japanese, English, Korean, Traditional Chinese, and German).

Screenshots

BYLD4 screens
FFMI Calc3 screens

Verdict

The call

The clearest difference is in-app purchases: FFMI Calc at none against BYLD's 2. FFMI Calc also leads on update cadence (every 4 days vs every 2 weeks). On price, ads, device support and iOS requirement 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. BYLD sells 2 in-app purchases, starting at $2.99 per month. FFMI Calc asks for nothing beyond the download.

UpkeepUpdate frequency

BYLD ships an update every 2 weeks, FFMI Calc every 4 days. The most recent releases landed on October 13, 2026 and October 7, 2026 respectively.

Scorecard2 real differences · 4 level
BYLD versus FFMI Calc: the parameters behind the verdict, then further details
ParameterBYLDFFMI Calc
PriceFreeFree
Update frequencyEvery 2 weeksEvery 4 days — better
AdsNoNo
In-app purchasesYesNo — better
DevicesiPhoneiPhone, iPad — better
Requires iOS26.0 — better26.4
Further details — not scored
Size64 MB1 MB
Age rating4+4+
DeveloperCEKA ARES E.E.Tomoharu Iseki

In-app purchases

2 purchases

BYLD

Subscriptions2
  • Byld Premium Monthly$2.991 Month
  • Byld Premium Monthly14 Days trial$19.991 Year
None

FFMI Calc

No in-app purchases

Questions

Is BYLD free?
BYLD is free to download, with in-app purchases available.
Is FFMI Calc free?
FFMI Calc is free to download, with no in-app purchases.
Do BYLD or FFMI Calc have ads?
Neither BYLD nor FFMI Calc shows ads.
Which is updated more often, BYLD or FFMI Calc?
BYLD ships an update every 2 weeks, and FFMI Calc every 4 days. Most recently, BYLD was updated on October 13, 2026 and FFMI Calc on October 7, 2026.

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