Comparison

RackMath vs RepGenie

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

Head to head
About

RackMath

This app removes the guesswork from loading a barbell, providing color-coded diagrams for precise plate loading. It offers alternative weight options when exact matches aren't possible and allows for real-time bar monitoring as plates are added or removed.

Highlights
  • Color-coded plate diagrams
  • Nearest weight alternatives
  • Customizable plate inventory
  • Real-time bar weight monitoring
  • Multiple barbell setup organization
  • Efficient weight transitions
Features
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Stop doing plate math between sets. Type the weight you want on the bar and Rack Math shows exactly which plates to load per side, based on your plates, your bar, and your gym. Build a list of weights, and it tells you precisely what to ADD and REMOVE to get from each set to the next, so you spend your rest resting. FREE, FOREVER • Instant plate math for any weight, in lb or kg • Your plate inventory: only weights you can actually make • Bar diagrams that match what’s on the bar • Build-on-bar: enter what’s loaded right now and work from there RACK MATH COACH Turn the calculator into a training partner. Try the Coach free for your first 10 workouts. No account. Nothing to cancel. Keep it with a subscription or a one-time Lifetime purchase. • A daily plan built around your lifts: Rack Math schedules what to train next and adapts as you recover • Freshest: an extra generated session for off days. Lifts picked from whatever your recovery says is most rested, with the day’s plan built around them • Cardio-aware recovery: with Apple Health, your runs, rides, and swims count toward what’s fresh, tracked as one total across activities, so swapping a walk for a run never reads as slacking • Unlimited weights in your stack • Warmup ramps in one tap: straight sets, top set + backoff, or 5/3/1 • Follow mode: the current set lights up, DONE advances, the next plate change is always right in front of you • Lock Screen Live Activity: your rest countdown, next set, and exact plate change. Log your set, skip rest, or load the next exercise without unlocking your phone • Apple Watch: follow along from your wrist with displays for weight, per-side plates, a rest timer that taps you when it’s up, and one-tap DONE, synced from your iPhone • Automatic progression: Rack Math suggests your next weights and reps • Strength tracking: your estimated 1-rep max over time, and personal records • Gyms: save plate setups for home, work, or travel and switch in two taps • Workout timer with per-exercise split times • Apple Health: finished workouts logged as strength training (optional) • Workout history: what you lifted, how long it took, your top weight, and the ability to reload any past stack onto the bar • Fewer-swaps optimizer: re-arranges the whole workout’s plate layouts to minimize how many plates you touch • Save and reload your stacks Choose your plan: Monthly, Annual (best value), or pay once for Lifetime. The plate calculator stays free either way. No ads. PRIVATE BY DESIGN Rack Math has no accounts and no ads. Your training lives on your device and, if you use iCloud, syncs privately through your own iCloud account; we never see it. We use one privacy-first analytics tool that collects no personal data and can’t identify you. Writing to Apple Health is entirely opt-in. See our privacy policy: https://keithjeffery.org/rack-math-privacy

About

RepGenie

Features
Read full description

The hardest part is walking through the door. RepGenie handles everything else. Built for beginners who want to start lifting but don't know where to begin. RepGenie gives you a plan, remembers your weights, and guides you through every session. No personal trainer required. Not sure what to do? Generate a workout in seconds and just follow along Weights and reps pre-filled | Every exercise remembers your last session so you spend less time typing Rest timer built in | Complete a set and the timer starts automatically Track your progress | See where you're improving and what you've been neglecting Workout reminders | Get notified if you haven't trained in a while No subscription. No social feed. No distractions. Just you and your reps.

Screenshots

RackMath4 screens
RepGenie4 screens

Verdict

The call

The clearest difference is update cadence: RackMath at weekly against RepGenie's every 3 weeks. RepGenie's advantage is iOS requirement (15.1 vs 18.0). 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

RackMath ships an update weekly, RepGenie every 3 weeks. The most recent releases landed on October 1, 2026 and September 26, 2026 respectively.

Scorecard2 real differences · 8 level
RackMath versus RepGenie: the parameters behind the verdict, then further details
ParameterRackMathRepGenie
PriceFreeFree
Rating3.0 (4 ratings) — better—
Positive reviews33.3% of reviews—
Number of ratings4 — better—
Update frequencyWeekly — betterEvery 3 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPod
Requires iOS18.015.1 — better
Further details — not scored
Size7 MB23 MB
Age rating4+4+
DeveloperKeith JefferySean Brennan

In-app purchases

None

RackMath

No in-app purchases

None

RepGenie

No in-app purchases

Questions

Is RackMath free?
RackMath is free to download, with no in-app purchases.
Is RepGenie free?
RepGenie is free to download, with no in-app purchases.
Do RackMath or RepGenie have ads?
Neither RackMath nor RepGenie shows ads.
Which is updated more often, RackMath or RepGenie?
RackMath ships an update weekly, and RepGenie every 3 weeks. Most recently, RackMath was updated on October 1, 2026 and RepGenie on September 26, 2026.

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