App Overview

Centr: Strength & Fitness App icon

Centr: Strength & Fitness App

CH Digital Pty Ltd · Health & Fitness

Try the Centr App FREE for 7 days — cancel anytime.

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
4.8
20,662 ratings · Top 5%

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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Build Kit

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A product spec, screen plans, and build steps for your coding agent.

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Combine features and design from your favorite apps.

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What's included17 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
Preview a sample Build Kit No email needed

Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

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Free quick prompt For a smaller starting point

Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Centr: Strength & Fitness App: map the core Health & Fitness workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Include a wider range of workouts and user-generated content.

Assumption to check: Limited workout variety compared to other apps

Validate with people who use this workflow before building.

Hypothesis 2

Improve integration with HealthKit/Google Fit for better data syncing.

Assumption to check: Occasional syncing issues with devices

Validate with people who use this workflow before building.

Hypothesis 3

Add social challenges and community features to boost engagement.

Assumption to check: Lack of social features for motivation

Validate with people who use this workflow before building.

Hypothesis 4

Simplify subscription options and offer clearer value propositions.

Assumption to check: Subscription model can be confusing

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

Try the Centr App FREE for 7 days — cancel anytime. AWARDS CNET: Best Workout Subscription Apps for 2025 Good Housekeeping: The Best Workout Apps for All Fitness Levels Tom’s Guide: Best iPhone Apps in 2025 POPSUGAR: Best Strength Training Program MEN’S HEALTH: Home Gym Awards Centr is the all-in-one Strength & Fitness App built to help you reach your goals — whether you train at home or in the gym. Get personalized workout plans based on your goals, preferences, and experience level. Build muscle, get fit, and improve your endurance with programs designed by elite coaches — including the first-ever HYROX-certified training plan. Every plan in Centr is built for real progress. Stay consistent, track your results, and train wherever you are — at home or in the gym. Get stronger, move better, and achieve the results you’ve been chasing. Download Centr today and start your FREE 7-day trial. — CENTR FEATURES CUSTOM WORKOUTS FOR YOUR FITNESS GOALS - Personalized training based on your goals, preferences, and skill level - Programs for men and women, beginners to advanced - Focus on strength, weight loss, or general fitness WORK OUT ANYWHERE - Press play at the gym or at home - Choose between coached and self-guided workouts FEWER DECISIONS, BETTER RESULTS - We select your daily workout and meals based on your goals - Never stress about planning — just train and progress PERFECT FOR BUSY SCHEDULES - Workouts from 5 to 60 minutes that fit your day HYROX TRAINING - Official HYROX-certified program to build power and endurance for race day in 12 weeks - Plans for every level — from first-timers to pros MOTIVATION THAT LASTS - Train with world-class coaches who keep you accountable and inspired ENDLESS WORKOUT VARIETY - Strength, HIIT, Pilates, Yoga, HYROX, Boxing, MMA, Hybrid Training, and more - Filter by body part or equipment type BETTER RESULTS WITH PERSONALIZED MEAL PLANS - Expert-designed meal plans tailored to your food preferences - Healthy, delicious recipes to fuel your training - Options for every lifestyle — from plant-based to high-protein DEVICE COMPATIBILITY - Cast workouts to your TV or tablet - Sync with your Apple Watch for real-time fitness tracking MEET YOUR COACHES - Luke Zocchi: Chris Hemsworth’s personal trainer - Ingrid Clay: HIIT & HIRT strength coach + plant-based chef - Alexz Parvi: HILIT trainer - Dan Churchill: Cookbook author & nutrition coach - Maricris Lapaix: Beginner cardio & strength coach - Tahl Rinsky: Dynamic yoga instructor - Sylvia Roberts: Pilates instructor - Angie Asche: Dietitian & nutrition expert - Jess Kilts: Strength & conditioning coach - Bobby Holland Hanton: Hollywood stuntman - Ashley Joi: Cardio & strength trainer - Joseph Sakoda (Da Rulk): Special Ops trainer - Michael Olajide Jr.: Boxing champion & supermodel trainer - Torre Washington: Vegan bodybuilder - Jorge Blanco: Boxing & MMA coach — Unlock your full potential — start your 7-day free trial today. Memberships available for 1, 3, and 12 months. Payment will be charged to your iTunes account at confirmation of purchase and will automatically renew unless auto-renew is turned off at least 24 hours before the end of your current period. Your iTunes account will automatically be charged within 24 hours prior to the end of the current period. Current subscriptions may not be canceled during the active subscription period, but you can manage subscriptions and/or turn off auto-renewal by visiting your iTunes Account Settings after purchase. Any unused portion of a free trial period, if offered, will be forfeited when a subscription is purchased for that publication, where applicable. You can track your fitness journey by enabling Apple Health. Read full Terms of Service & Privacy Policy: https://centr.com/article/show/5293/privacy-policy https://centr.com/article/show/5294/terms-and-condition

Written user reviews are not shown here. Check current App Store reviews >

Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

SUGGESTED BUILD STACK
React Native
Expo
FastAPI
Zustand
Axios
react-navigation
BUILD KIT DIFFICULTY
Advanced

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.