Comparison

BIGG vs Kaizer

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

Head to head
About

BIGG

Manage your fitness journey with this app designed for members of BIGG. Book classes, view daily schedules, set training goals, and access home workouts. Explore various training modalities and equipment-based programs.

Highlights
  • Book classes
  • View daily schedule
  • Set training goals
  • Access home workouts
  • Equipment-based programming
  • Multiple training modalities
Features
Read full description

Si sos socios de algún BIGG no vas a querer perderte todas las herramientas que la App BIGG tiene para vos. - Reservar Clases - Programación Diaria - Objetivos y Planes de Entrenamiento - BIGG at Home - Programación con equipamiento - Muchas modalidades de entrenamiento

About

Kaizer

This AI-powered fitness planner creates hyper-personalized workout routines based on your goals, limitations, and available equipment. It intelligently adapts your training over time to ensure continuous progress and prevent burnout.

Highlights
  • AI-powered routine creation via natural language
  • Hyper-personalized plans based on user data
  • Smart progressive overload and weight updates
  • Exercise replacement suggestions
  • Professional coaching principles integrated
Features
Read full description

Kaizer is the app where you train with your trainer or your gym: your routine, your classes, the chat and your progress, all in one place. WITH YOUR GYM If your gym runs on Kaizer, you join with the link they share and see the app with their name, logo and color. Book your classes or keep a fixed spot, read your gym's news and train with the routine they assign you. WITH YOUR TRAINER Your trainer sends you your routines, follows your progress, adjusts whatever needs adjusting, chats with you and asks for form videos. All of it in one place, without leaning on three other apps. NO TRAINER YET? Browse the marketplace inside the app. Every profile shows how that coach works, their specialties and whether they train online, in person or both. Subscribe to the one that fits and they are notified the moment you join. YOUR SESSIONS, IN DETAIL Sets, reps, load, rest. Supersets, circuits and dropsets when your plan calls for them. Every exercise ships with an illustration of the muscle it works, so you know what you are aiming at before you lift. ASSISTED PROGRESSION Week over week, Kaizer writes the loads of your upcoming sessions from what you actually lifted. You always know what to do when you walk into the gym, and the weight on the bar keeps moving. SMART REPLACE Machine taken? A movement you cannot do today? Kaizer suggests alternatives that keep the point of the exercise intact, so swapping one leaves the rest of the plan standing. EVERYTHING IN ONE PLACE - Direct chat with your trainer: text, photos, files and voice notes - Nutrition plan with meals, recipes and macros, when your trainer sends one - Full training history, streaks and progress your trainer sees too - 1,500+ exercises with illustrations - Apple Health sync and Live Activities while you train - Rest timer that runs on your lock screen TRAINING ON YOUR OWN? You can also use Kaizer without a trainer. Describe what you want in plain language (four days a week, bad knees, dumbbells only) and Kaizer builds a complete structured program in seconds, and keeps adapting it as you log your work. Kaizer works in Spanish, English and Portuguese, in 20+ countries. Terms of Service: https://kaizer.app/en/terms-and-conditions Privacy Policy: https://kaizer.app/en/privacy-policy

Screenshots

BIGG3 screens
Kaizer4 screens

Verdict

The call

BIGG and Kaizer both sit at 4.9 stars, but that hides the real split: 100% of Kaizer's written reviews are positive against 52% of BIGG's. Kaizer also leads on update cadence (every 8 days vs every 3 weeks). BIGG's advantage is in-app purchases (none vs 11) and ratings volume (335 vs 9). On price, rating, 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. Kaizer sells 11 in-app purchases, starting at $3.99 per 7 days. BIGG asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for BIGG against 5.0 for Kaizer. That said, the two scores are not equally well evidenced: BIGG has 335 ratings behind it against 9, so its average is the more settled of the two. Written reviews are what separate them: 52% of BIGG's written reviews are positive against 100% of Kaizer's.

UpkeepUpdate frequency

BIGG ships an update every 3 weeks, Kaizer every 8 days. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

Scorecard5 real differences · 5 level
BIGG versus Kaizer: the parameters behind the verdict, then further details
ParameterBIGGKaizer
PriceFreeFree
Rating4.9 (335 ratings)5.0 (9 ratings) — better
Positive reviews51.6% of reviews100.0% of reviews — better
Number of ratings335 — better9
Update frequencyEvery 3 weeksEvery 8 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationAd-supported — betterFreemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.416.4
Further details — not scored
Size125 MB109 MB
Age rating4+4+
DeveloperBigg Fit LLCKAIZER

Customer experience

BIGG

All ratings332 ratings
Positive98.2%
Neutral0.9%
Negative0.9%
Written reviews64 reviews
Positive51.6%
Neutral14.1%
Negative34.4%

Kaizer

All ratings9 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

BIGG

No in-app purchases

11 purchases

Kaizer

Subscriptions10
  • Pro Weekly3 Days trial$3.997 Days
  • Pro Monthly3 Days trial$8.991 Month
  • Trainer Plan — $39.99$39.991 Month
Show 7 more
  • Pro Yearly7 Days trial$39.991 Year
  • Trainer Plan — $59.99$59.991 Month
  • Trainer Plan — $79.99$79.991 Month
  • Trainer Plan — $99.99$99.991 Month
  • Trainer Plan — $109.99$109.991 Month
  • Trainer Plan — $129.99$129.991 Month
  • Trainer Plan — $159.99$159.991 Month
One-time1
  • Pro Lifetime$89.99

Questions

Is BIGG free?
BIGG is free to download, with no in-app purchases.
Is Kaizer free?
Kaizer is free to download, with in-app purchases available.
Which has better reviews, BIGG or Kaizer?
Kaizer is rated higher. BIGG averages 4.9 out of 5 from 335 ratings, while Kaizer averages 5.0 from 9 ratings.
Do BIGG or Kaizer have ads?
Neither BIGG nor Kaizer shows ads.
Which is updated more often, BIGG or Kaizer?
BIGG ships an update every 3 weeks, and Kaizer every 8 days. Most recently, BIGG was updated on October 22, 2026 and Kaizer on October 24, 2026.

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