Bustafit vs Kaizer for Coaches
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Bustafit
This app helps you maximize hypertrophy training by logging weights, reps, and RIR. It provides practical load and rep recommendations for progressive overload and connects you with your online coach for personalized guidance.
- Log weights, reps, and RIR
- Get load and rep recommendations
- Connect with online coach
- Follow structured routines
- AI-assisted video technique review
- Track rest with timers
- Log nutrition and macros
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Bustafit is built to help you maximize your hypertrophy training, from beginner to elite. It combines a weight and workout log, structured routines, and a connection to your own online coach so you know what to do today and how to progress. The app remembers your last useful set and turns weights, reps and RIR into practical load and rep recommendations. Use that guidance for progressive overload, plateau decisions, and a clearer next exposure without scattered notes. If you already work with a trainer, connect them by code or link. With your permission, they can review your profile and history, assign training blocks, leave directives, adjust saved plans, and view your technique reviews. What you can do with Bustafit: - Log weights, loads, reps and RIR for every set. - See your last useful reference before training. - Get load and rep recommendations based on performance. - Follow structured routines for the gym, home or dumbbell-only training. - Adapt training to experience levels from beginner to elite. - Use alternatives when equipment is busy or pain appears. - Review weekly volume, history and workout continuity. - Track rest with timers and alerts. - Use AI-assisted video technique review and keep results in your history. - Keep nutrition, calories and macros alongside training. - Follow supplement reminders saved by you or your coach. - Train connected to your own online coach. Bustafit brings tracking, progression, technique, nutrition and coaching together to help you make a clearer decision for every set. The app is not medical advice and does not diagnose, treat, cure or prevent any disease. Nutrition guidance is informational; supplement reminders do not prescribe or validate doses. Ask a qualified health professional or registered dietitian when appropriate.
Kaizer for Coaches
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Kaizer is the app for trainers you want within reach. Manage every client, build professional training plans and keep the conversation in one place, from your phone. YOUR CLIENTS, ORGANISED Your whole roster in one place. Find any client in seconds, open their profile and follow their progress: adherence, completed sessions, streak, weight, goals and weak points. Add private notes so nothing slips. PLANS THAT ADAPT Build reusable programs and assign them to a client in one tap. Organise by weeks and sessions, and write routines with everything you need: sets, reps, load, rest, supersets, circuits and dropsets. Every exercise ships with an illustration of the muscle it works. SESSIONS IN DETAIL Define each movement precisely and leave notes on the whiteboard (warm-up, cues, cool-down) so your client knows exactly what to do. DIRECT CHAT WITH YOUR CLIENTS Talk to each one inside the app: messages, photos, files and voice notes. Keep the follow-up close without leaning on other apps. AI ASSISTANT Your coaching copilot. Ask it to draft routines, follow up on clients, look up exercises and explain how your business is doing. Ask it anything, whenever. LET THEM FIND YOU Publish your profile on the Kaizer marketplace: clients who do not have a trainer yet see how you work, your specialties and whether you coach online, in person or both. You can also share your personal link to bring clients in from outside. GROW YOUR BUSINESS Invite people to your list and measure what matters: adherence and retention. EVERYTHING IN ONE PLACE - Home dashboard with your day at a glance - Alerts for clients with no routine assigned - Exercise library with illustrations - Sign in with Apple and Google - Notifications when your clients train or message you Kaizer is built for personal trainers, coaches and fitness professionals who want to spend less time on admin and more time coaching. Please note: the app interface is currently in Spanish. English and Portuguese versions are in the works. Terms of Service: https://kaizer.app/en/terms-and-conditions Privacy Policy: https://kaizer.app/en/privacy-policy
Screenshots
Verdict
Bustafit and Kaizer for Coaches are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Bustafit ships an update fortnightly, Kaizer for Coaches weekly. The most recent releases landed on October 10, 2026 and October 6, 2026 respectively.
| Parameter | Bustafit | Kaizer for Coaches |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Fortnightly | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 17 MB | 71 MB |
| Age rating | 4+ | 4+ |
| Developer | Monica Andrea Luna Pinilla | KAIZER |
In-app purchases
Bustafit
No in-app purchases
Kaizer for Coaches
No in-app purchases









