Comparison

RestOrTrain vs BioDecay

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

Head to head
About

RestOrTrain

This app uses AI to analyze your training data, from individual workouts to your complete fitness history. It provides insights into your endurance performance and training patterns. Access detailed information about your fitness journey.

Highlights
  • AI-driven training analysis
  • Comprehensive fitness history tracking
  • Individual activity insights
  • Endurance athlete focus
  • Performance pattern identification
Features
Read full description

AI that thinks about your training, from individual activities to your entire fitness history. Terms of Use: https://restortrain.com/terms Privacy Policy: https://restortrain.com/privacy

About

BioDecay

Features
Read full description

BioDecay: Science-Driven Supplement Optimization Master your body’s chemistry with clinical precision. BioDecay is far more than a standard tracking app. It is a high-precision pharmacokinetic modeling engine designed for those who demand a deeper understanding of bioavailability and metabolic behavior. Utilizing dynamic compartmental models, the platform visualizes in real-time how hydration, caffeine, and key supplements interact within your unique physiology. Key Features Real-Time Metabolic Modeling Visualize personalized absorption and decay curves. Gain immediate insights into exactly how water, caffeine, creatine, magnesium, and protein behave inside your system. Dynamic Bio-Interaction The BioDecay engine calibrates based on your current physiological state. If the system detects dehydration or high protein intake, it automatically adjusts the renal clearance rate of other substances to reflect your biological reality. Personalized Performance Plans Configure safety thresholds and daily goals tailored to your specific profile and objectives: General Health: Daily wellness and balance optimization. Hypertrophy: Focused on protein synthesis and creatine loading. Cutter/Definition: Precise adjustments for fat loss and metabolic control. Endurance and Performance: Maximizing energy efficiency and electrolyte balance. Historical Analysis and Integrated Calendar Manage your intake history and review the behavior of your metabolic curves for any past date. The integrated calendar view allows you to identify long-term patterns and trends in your performance. Professional PDF Reporting Generate and export detailed 30-day reports, including concentration levels, consumption trends, and goal compliance—ideal for deep-dive analysis or professional consultation. Environmental Context Integration BioDecay incorporates external variables such as ambient temperature alongside biological data—including weight, biological sex, and health habits—to accurately calculate fluid loss and metabolic rates. Stop guessing. Start optimizing. Download BioDecay and turn data into peak performance.

Screenshots

RestOrTrain4 screens
BioDecay4 screens

Verdict

The call

The clearest difference is ads: BioDecay at none against RestOrTrain's shown. RestOrTrain's advantage is iOS requirement (18.0 vs 26.0). On price, 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. RestOrTrain sells 6 in-app purchases, starting at $14.99 per month and BioDecay sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Scorecard2 real differences · 8 level
RestOrTrain versus BioDecay: the parameters behind the verdict, then further details
ParameterRestOrTrainBioDecay
PriceFreeFree
Rating4.8 (655 ratings) — better—
Positive reviews61.5% of reviews—
Number of ratings655 — better—
Update frequencyEvery 4 days—
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad — betteriPhone
Requires iOS18.0 — better26.0
Further details — not scored
Size34 MB1 MB
Age rating12+17+
DeveloperRESTORTRAIN SP Z O OJose Gea

In-app purchases

6 purchases

RestOrTrain

Subscriptions6
  • PRO Monthly1 Month trial$14.991 Month
  • PRO Monthly$14.991 Month
  • PRO Monthly7 Days trial$14.991 Month
Show 3 more
  • PRO Annual1 Month trial$134.991 Year
  • PRO Annual$134.991 Year
  • PRO Annual7 Days trial$134.991 Year
1 purchases

BioDecay

One-time1
  • BioDecay Unlock$3.99

Questions

Is RestOrTrain free?
RestOrTrain is free to download, with in-app purchases available.
Is BioDecay free?
BioDecay is free to download, with in-app purchases available.
Do RestOrTrain or BioDecay have ads?
RestOrTrain shows ads; BioDecay does not.

Other comparisons