Comparison

RackMath vs Hi

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

Hi

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Stop Renting Your Progress. Own It Forever. Experience the future of nutrition tracking—the culturally-aware AI food scanner built for peak performance and community-driven intelligence. Free to try for 48 hours. Tired of monthly subscriptions and giving away your personal identity? Hi-Pro is built by an independent developer for disciplined users who want pro-level insights without the "Big Tech" baggage. By utilizing de-identified, high-level analytics, we constantly evolve our AI while keeping your personal life strictly off-limits. No accounts, no identity tracking—just the most powerful nutrition tool on your device. Now with Apple Health sync. WHY HI-PRO? FREE TO TRY: 48 hours of unlimited, high-precision AI scanning. No commitment required. OWN IT FOREVER: One-time purchase, lifetime access. Say goodbye to subscription fatigue. RESEARCH-BACKED PRIVACY: We protect your identity. While we use de-identified usage data to improve our global nutritional models, your food diary, personal photos, and health metrics are never linked to your identity. APPLE HEALTH SYNC: Your daily steps earn bonus calories automatically. Meal calories sync to Apple Health. All processing happens on-device for maximum speed and security. STEP MILESTONE ALERTS: Get notified at 5K, 10K, and 15K steps with your exact calorie bonus for the day based on your unique metabolic profile. CULTURALLY AWARE AI: From Turkish Menemen and Arabic Kabsa to Japanese Sushi and Australian Meat Pies—our AI is trained on global datasets to recognize what you actually eat. "HIDDEN OIL" LOGIC: Unlike basic trackers, our AI accounts for hidden cooking oils and restaurant preparation for a more honest, "real-world" calorie count. GLOBAL SUPPORT Fully localized in 13 languages: English, Turkish, Spanish, French, German, Arabic, Portuguese, Japanese, Korean, Chinese, Hindi, Italian, and Russian. HOW IT WORKS Snap: Take a photo of your meal. Analyze: Instant AI breakdown of Calories, Protein, Carbs, and Fats. Contribute: Your anonymous usage helps refine the world's most accurate cultural food database. Sync: Steps and calories flow automatically to Apple Health. Progress: Track your daily goals with zero friction and total peace of mind. Built for the disciplined. Scaled for the world. Start your free trial today.

Screenshots

RackMath4 screens
Hi4 screens

Verdict

The call

The clearest difference is in-app purchases: RackMath at none against Hi's 1. RackMath also leads on update cadence (weekly vs monthly). Hi's advantage is iOS requirement (16.6 vs 18.0). On price, ads 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. Hi sells 1 one-off in-app purchase. RackMath asks for nothing beyond the download.

UpkeepUpdate frequency

RackMath ships an update weekly, Hi monthly. The most recent releases landed on October 1, 2026 and October 2, 2026 respectively.

Scorecard3 real differences · 7 level
RackMath versus Hi: the parameters behind the verdict, then further details
ParameterRackMathHi
PriceFreeFree
Rating3.0 (4 ratings) — better—
Positive reviews33.3% of reviews—
Number of ratings4 — better—
Update frequencyWeekly — betterMonthly
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPad
Requires iOS18.016.6 — better
Further details — not scored
Size7 MB6 MB
Age rating4+4+
DeveloperKeith JefferyDeniz Dogulu

In-app purchases

None

RackMath

No in-app purchases

1 purchases

Hi

One-time1
  • Lifetime Access$9.99

Questions

Is RackMath free?
RackMath is free to download, with no in-app purchases.
Is Hi free?
Hi is free to download, with in-app purchases available.
Do RackMath or Hi have ads?
Neither RackMath nor Hi shows ads.
Which is updated more often, RackMath or Hi?
RackMath ships an update weekly, and Hi monthly. Most recently, RackMath was updated on October 1, 2026 and Hi on October 2, 2026.

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