App Overview

HealthFit icon

HealthFit

Stephane Lizeray · Health & Fitness

Turn your Apple Watch into a complete training platform.

$6.99 · In-app purchases

PRICE
$6.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.6
901 ratings · Top 15%

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 included18 files

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

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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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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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 HealthFit: 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

Implement a comprehensive food database with barcode scanning.

Assumption to check: Limited food database for nutrition logging

Validate with people who use this workflow before building.

Hypothesis 2

Add social challenges and community features.

Assumption to check: Lack of social features for motivation

Validate with people who use this workflow before building.

Hypothesis 3

Optimize data fetching and syncing with background processing.

Assumption to check: Performance issues with data sync

Validate with people who use this workflow before building.

Hypothesis 4

Enhance onboarding with guided tutorials and tips.

Assumption to check: Inconsistent user onboarding experience

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

Turn your Apple Watch into a complete training platform. HealthFit transforms the workout and health data stored in Apple Health into advanced fitness metrics, training insights, and seamless workout syncing—with no account required. Whether you're training for your next race, improving your fitness, or simply staying active, HealthFit helps you understand your progress, optimize your training, and achieve your goals. TRAIN SMARTER Go beyond basic workout summaries with advanced training analytics designed to help you make better decisions. HealthFit helps you understand: • Training Load • Fitness (CTL), Fatigue (ATL), and Form (TSB) • Training Load Ratio • Heart Rate Zones and Training Distribution • Year Comparisons and Trends • Explorer Score and Training Heat Maps These are the kinds of metrics and insights typically reserved for premium coaching platforms. EVERYTHING IN ONE PLACE HealthFit combines your workouts, fitness trends, and health metrics in a beautifully designed app. No more jumping between multiple apps. Track your training load, fitness progression, health metrics, and workout history from a single dashboard. A BETTER ACTIVITY FEED Browse all your workouts with maps, photos, and key metrics visible at a glance. Dive deeper into every activity with advanced analysis including: • Customizable Heart Rate Zones • Training Load Tracking • Equipment Tracking (Shoes, Bikes & More) • Elevation, Pace, Power & Cadence Analysis • Detailed Charts & Performance Trends HealthFit can even automatically associate photos taken during your workouts, bringing your activity history to life. POWER INSIGHTS Analyze your running and cycling power with advanced metrics including: • Estimated Critical Power • Weighted Average Power • Mean Maximal Power Curves • Power Distribution Analysis • Historical Power Trends Understand how your power evolves and identify your strengths across different durations. HEALTH METRICS FOR ATHLETES HealthFit provides a focused view of the health metrics that matter most, helping you understand how your health, stress, and fitness evolve over time. • Heart Rate Variability (HRV) • Resting Heart Rate • Cardio Fitness (VO₂ Max) • Sleep Metrics • Weight, BMI & Body Fat • Baevsky Stress Index Everything is presented clearly so you can connect your health trends to your training performance. BUILT FOR EVERY SPORT Most fitness apps focus on running and cycling. HealthFit supports all activity types and automatically adapts its statistics, charts, and analysis to your most frequent activities, whether you specialize in a single sport or enjoy a variety of activities. AUTOMATIC WORKOUT SYNCING HealthFit automatically syncs your workouts in the background to all your favorite fitness platforms. Every workout recorded with Apple Watch is uploaded automatically—no manual exports, no extra steps, no missing activities. You can even sync your entire workout history. MULTISPORT SUPPORT HealthFit fully supports multisport and interval workouts and is one of the few apps capable of exporting multisport activities as true multisession workouts. YOUR DATA STAYS YOURS Privacy is a core principle of HealthFit. No account required. No login required. HealthFit works directly with Apple Health and keeps your data on your device—giving you powerful fitness insights without sending your personal data to the cloud. CONNECTS TO YOUR FAVORITE FITNESS PLATFORMS Supported services include Strava, TrainingPeaks, Final Surge, Selfloops, Smashrun, Ride with GPS, Cycling Analytics, Today's Plan, Runalyze, Suunto, 2PEAK, Komoot, COROS, Intervals.icu, Nolio, TrainAsONE, Tredict, Stages Link, Map My Tracks, and Xhale. Export detailed workout reports to Markdown, complete with charts, maps, and workout insights, or export your data in FIT, GPX, CSV, and Google Sheets formats. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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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.

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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.