Comparison

SuppLab vs Gym Boss

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

Head to head
About

SuppLab

Features
Read full description

Does that supplement actually work for you — or are you paying for expensive placebo? SuppLab turns your supplement routine into a personal science lab: run randomized 21-day self-experiments (N-of-1 trials) and get an evidence-based verdict for YOUR body. No account, no cloud — all your health data stays on your iPhone. HOW IT WORKS 1. Pick a supplement and a goal (sleep, recovery, energy…) 2. SuppLab randomly assigns TAKE and SKIP days across 21 days 3. Complete a quick daily check-in while Apple Health tracks your baseline 4. Get a clear decision card: keep it, drop it, or test longer YOUR STACK, UNDER CONTROL • One-tap logging for your entire supplement stack • Adherence percentage — see how consistent you really are • Yearly waste calculator: what supplements that do nothing cost you per year • Smart alert when adding a new supplement mid-experiment, so your results stay clean BUILT ON REAL DATA • Apple Health baseline: sleep, HRV, resting heart rate, steps • Subjective daily check-ins combined with objective metrics • Randomized TAKE/SKIP protocol reduces placebo bias PRIVATE BY DESIGN • No account, no sign-up, no backend • All analysis runs entirely on-device • Your health data never leaves your phone Stop guessing. Start testing. Your body, your evidence. --- Terms of Use (EULA): https://umay.dev/supplab-terms-of-use.html Privacy Policy: https://umay.dev/supplab-privacy-policy.html

About

Gym Boss

This app serves as a flexible training notebook to plan and track your workouts, including sets, cardio, nutrition, and progress. It offers an AI coach that learns from your training history to provide personalized recommendations and insights.

Highlights
  • Custom workout planning
  • Train Mode for execution
  • Track sets, cardio, nutrition
  • AI coach with workout context
  • Next-workout recommendations
  • Strength progress by muscle group
  • Food logging and barcode scanning
Features
Read full description

Gym Boss is the training notebook that learns how you train. Plan workouts your way with flexible notes, then use Train Mode when it’s time to lift. Track sets, cardio, nutrition, bodyweight, and progress without forcing your routine into someone else’s template. As your training history grows, Gym Boss can help you understand it, recommend what to do next, and give you an AI coach that already knows the context behind your workouts. WORKOUTS THAT FIT YOU Create completely custom workout notes Choose from built-in training splits or start blank Use Train Mode to execute your workout Track workout duration and exercise history See next-workout recommendations based on your training ASK GYM BOSS AI Ask questions about your workouts, progression, nutrition, and training. Gym Boss can use your recent history and workout context so you don’t have to explain everything from scratch. TRACK MORE THAN LIFTS Log food naturally and estimate calories and macros Scan food barcodes Track outdoor and indoor cardio Log bodyweight and view your history Explore strength progress by muscle group Review weekly and monthly recaps GYM BOSS PREMIUM Premium turns your training history into deeper guidance with expanded AI coaching, personalized training intelligence, advanced insights, and additional Premium features. The core tracking tools stay useful without Premium. Gym Boss is built so the data you log belongs to your training experience, not a paywall. Privacy Policy: https://gymbossnotes.com/#privacy Terms of Use: https://gymbossnotes.com/#terms

Screenshots

SuppLab4 screens
Gym Boss4 screens

Verdict

The call

The clearest difference is iOS requirement: Gym Boss at 15.1 against SuppLab's 17.0. 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. SuppLab sells 2 in-app purchases, starting at $4.99 per 7 days and Gym Boss sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

Scorecard1 real difference · 9 level
SuppLab versus Gym Boss: the parameters behind the verdict, then further details
ParameterSuppLabGym Boss
PriceFreeFree
Rating—5.0 (3 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—3 — better
Update frequency—Every 3 days
AdsNoNo
In-app purchasesYesYes
Monetization—Freemium
DevicesiPhoneiPhone, iPod — better
Requires iOS17.015.1 — better
Further details — not scored
Size4 MB70 MB
Age rating12+17+
DeveloperBugra GunayMaddox Borden

In-app purchases

2 purchases

SuppLab

Subscriptions2
  • Weekly Premium$4.997 Days
  • Annual Premium7 Days trial$49.991 Year
2 purchases

Gym Boss

Subscriptions2
  • Gym Boss: Premium$5.991 Month
  • Gym Boss: Premium Annually$59.991 Year

Questions

Is SuppLab free?
SuppLab is free to download, with in-app purchases available.
Is Gym Boss free?
Gym Boss is free to download, with in-app purchases available.
Do SuppLab or Gym Boss have ads?
Neither SuppLab nor Gym Boss shows ads.

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