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.
App Overview
Google Fit: Activity Tracker
Get to a healthier and more active life with Google Fit!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.3
2,148 ratings · Top 30%
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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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.
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
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Google Fit: Activity Tracker: 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 more reliable sync features with real-time updates.
Assumption to check: Syncing issues with wearables and devices
Validate with people who use this workflow before building.
Hypothesis 2
Include customizable workout routines based on user goals.
Assumption to check: Lack of personalized workout plans
Validate with people who use this workflow before building.
Hypothesis 3
Enhance with a comprehensive food database and tracking options.
Assumption to check: Limited nutrition tracking features
Validate with people who use this workflow before building.
Hypothesis 4
Design a cleaner, more streamlined interface for better usability.
Assumption to check: User interface can be cluttered
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
Get to a healthier and more active life with Google Fit! It’s hard to know how much or what kind of activity you need to stay healthy. That’s why Google Fit collaborated with the World Health Organization (WHO) and the American Heart Association (AHA) to bring you Heart Points, an activity goal that can help improve your health. Activities that get your heart pumping harder have tremendous health benefits for your heart and mind. You’ll earn one Heart Point for each minute of moderate activity like picking up the pace when walking your dog, and double points for more intense activities like running. It takes just 30-minutes of brisk walking five days a week to reach the AHA and WHO’s recommended amount of physical activity shown to reduce the risk of heart disease, improve sleep, and increase overall mental wellbeing. Google Fit will also help you: SEE YOUR WORKOUTS Get insights and see stats such as heart rate, speed, pace, route, and more for your runs, walks, and bike rides. MONITOR YOUR GOALS See your daily progress on your Heart Points and steps. Meeting your goals all the time? Easily adjust your goals to keep challenging yourself to achieve a healthy heart and mind. MAKE EVERY MOVE COUNT All physical activity can help you lead a healthier life, and with Google Fit you can track it all in one place. Working with your favorite fitness apps and devices, Google Fit builds a journal of your activity. And to make sure Fit never misses a workout, you can manually add any activity your other apps didn’t track - from Aerobics to Zumba! CONNECT WITH YOUR FAVORITE APPS AND DEVICES Google Fit can show you info from many of your favorite apps and devices that are compatible with Apple Health to give you a holistic view of your health, so you’ll never lose track of your progress. These include Lifesum, Runkeeper, Strava, MyFitnessPal, Headspace, and more. CHECK IN AT ANYTIME, FROM ANYWHERE See a snapshot of your activity history across Google Fit and your integrated apps in your journal. Or, see the full picture in browse, where you can find all of your health and wellness data. Learn more about Google Fit and see a list of supported apps at: https://www.google.com/fit
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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.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
Supabase
react-native-reanimated
expo-router
BUILD KIT DIFFICULTY
Intermediate
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.
