Comparison

PrepLyfe vs Constant

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

Head to head
About

PrepLyfe

This app uses AI to create personalized fitness and nutrition plans for athletes and coaches. It offers habit tracking, detailed logging of workouts and meals, and progress analysis. Coaches can manage clients, assign habits, and generate plans through a dedicated platform.

Highlights
  • AI-driven plan generation
  • Habit tracking with Discipline Score
  • Macro planning and food logging
  • Workout logging with progress trends
  • Body metrics tracking
  • Coach platform for client management
Features
Read full description

PrepLyfe — Live Disciplined. Built by an IFBB Pro Athlete and Competition Prep Coach, PrepLyfe is the fitness app for athletes who train with intent and the coaches who guide them. Powered by the Physique Intelligence Engine™, PrepLyfe combines AI-driven plan generation, habit tracking with a daily Discipline Score, deep nutrition and training tracking, and a full coach platform — all in one app. ATHLETES — track what matters • Habit tracking + daily Discipline Score — quantify the consistency that drives results. • Macro planning with USDA + branded food search and barcode scanning • Daily food logging with live progress bars • Workout logging — sets, reps, weight, history, and volume trends • Body metrics: weight, body fat %, skeletal muscle mass, hydration, blood pressure • Apple Health integration for steps, energy, and biometrics • Daily check-ins with text, photos and voice messages • AI-powered progress analysis, peak week protocols, and plan/macro/cardio adjustments COACHES — manage clients without the chaos • Client roster, plan editor, and check-in review inside the app • Assign custom habits to clients — accountability built into the daily flow • AI Plan Generator for prep, training, and nutrition plans • Public storefront (preplyfe.io/c/yourhandle) for selling coaching, digital programs, and AI plans • Multi-coach delegation per plan • In-App Photo and voice attachments on client text messages THE PRINCIPLE Activation. Isolation. Concentration. Progressive overload. Every feature is built around that core training philosophy. PRICING • Athletes — free at the base tier. Optional AI Credit packs (consumable IAP) or Athlete Unlimited subscription (auto-renewable IAP) for full AI access. • Coaches — web-managed subscription tiers, starting at $9.99/mo at preplyfe.io/coach/billing. Terms of Use: https://preplyfe.io/terms Privacy Policy: https://preplyfe.io/privacy Live Disciplined.

About

Constant

Read full description

Never wonder what to do at the gym again. Constant is an AI training coach that programs your workouts, logs your sets, and adjusts every session to how you're actually recovering. Most apps hand you a fixed plan and leave the thinking to you. Constant does the thinking: it reads your recovery, writes today's session, and adapts tomorrow based on what you logged and how you slept. The product isn't a library of workouts. It's consistency — showing up, session after session, on a plan that meets you where your body is. HOW IT WORKS Each morning, Constant checks how you recovered — from a quick Good / Okay / Bad check-in, or automatically from sleep, HRV, and resting heart rate read from Apple Health. Then it finalizes one session for the day, gated to your readiness. Train hard when you're recovered; hold back when you're not. You log each lift in seconds and mark it Easy, OK, or Hard. That feedback shapes the next session's loads. The plan is always one clear workout — never a wall of options to decode. TRAINS AROUND YOUR INJURIES Tell Constant what hurts — or record what your physio said — and every session adapts: restricted movements come out, safe substitutions go in, and loads rebuild as you recover. Most training apps ignore this entirely. WHAT YOU GET - A daily training plan that adapts to your recovery, not a fixed template - Automatic recovery readings from Apple Health: sleep, HRV, resting heart rate, steps - A simple daily check-in when you'd rather report how you feel - Fast set logging with per-lift Easy / OK / Hard feedback that drives progression - Nutrition logging with daily calorie and protein targets - AI food estimates: snap a photo of a meal, get a calorie and protein estimate - A trajectory score that tracks the one thing that matters — did you show up - Activity logging for padel and other sessions FREE AND PREMIUM The full coach is free: your adaptive daily plan, workout logging, recovery readings, nutrition targets, your trajectory score, and one AI food estimate per day. Premium ($9.99/month or $49.99/year) adds: - 10 AI food photo estimates per day - Voice recording for physiotherapy and doctor visits, with the restrictions folded into your plan The yearly plan starts with a 7-day free trial. Subscriptions are billed through your Apple ID and renew automatically unless cancelled at least 24 hours before the period ends. Manage or cancel anytime in your App Store account settings. YOUR DATA Constant reads recovery metrics from Apple Health to adapt your training. It does not write data back to Apple Health. Meal photos are sent for a one-time estimate and are never stored. Your training, recovery, and nutrition data are tied to your account and are never used to track you across other apps. Constant supports your training. It is not a medical device and does not provide medical advice. Always consult a qualified professional for health and injury decisions. Train consistently. Let the plan adapt. Terms of Use (EULA): https://trainconstant.com/terms Privacy Policy: https://trainconstant.com/privacy

Screenshots

PrepLyfe4 screens
Constant4 screens

Verdict

The call

The clearest difference is ads: PrepLyfe at none against Constant's shown. On price, update cadence, 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. PrepLyfe sells 4 in-app purchases, starting at $9.99 per month and Constant sells 1 in-app purchase, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

PrepLyfe ships an update every 5 days, Constant weekly. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

Scorecard1 real difference · 9 level
PrepLyfe versus Constant: the parameters behind the verdict, then further details
ParameterPrepLyfeConstant
PriceFreeFree
Rating5.0 (3 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 5 days — betterWeekly
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPod, Apple Watch — betteriPhone, iPod
Requires iOS15.115.1
Further details — not scored
Size52 MB54 MB
Age rating12+4+
DeveloperInfinite Software Solutions, LLCGil Erez

In-app purchases

4 purchases

PrepLyfe

Subscriptions1
  • Athlete Unlimited$9.991 Month
One-time3
  • 15 AI credits$4.99
  • 50 AI credits$14.99
  • 120 AI credits$29.99
1 purchases

Constant

Subscriptions1
  • Constant Premium$5.991 Month

Questions

Is PrepLyfe free?
PrepLyfe is free to download, with in-app purchases available.
Is Constant free?
Constant is free to download, with in-app purchases available.
Do PrepLyfe or Constant have ads?
Constant shows ads; PrepLyfe does not.
Which is updated more often, PrepLyfe or Constant?
PrepLyfe ships an update every 5 days, and Constant weekly. Most recently, PrepLyfe was updated on November 5, 2026 and Constant on October 31, 2026.

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