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
Fitness Totals
Managing your long-term fitness progress is difficult
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
82 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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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/
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.
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 Fitness Totals: 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 activities and customizable tracking.
Assumption to check: Limited exercise variety and tracking options
Validate with people who use this workflow before building.
Hypothesis 2
Improve chart designs for better insights.
Assumption to check: Difficulty in data visualization for progress
Validate with people who use this workflow before building.
Hypothesis 3
Add options for sharing progress and achievements with friends.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Clarify subscription benefits and provide a clearer paywall.
Assumption to check: In-app purchase confusion
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
Managing your long-term fitness progress is difficult. Fitness Totals simplifies it by emphasizing weekly, monthly and yearly activity totals using data from the Apple Health app. Stay motivated by comparing your progress to last week, last month and last year! COMPARE Easily compare weekly, monthly, yearly, and all-time totals for steps, running, cycling and over 40 other fitness activities. WIDGETS Glance at your progress with 4 different customizable widgets, including a recently-added chart widget! THEMES Beautiful in both light and dark mode CUSTOM ICONS 14 alternate app icons SHARE Let others in on your fitness totals with simple sharing PRIVACY Your health data never leaves your phone. ACTIVITIES - Active Calories Burned - Basketball - Boxing - Cooldown - Core Training - Cross Training - Cycling - Cycling (Workout) - Dance - Downhill Snow Sports - Elevation Gain - Elliptical - Exercising - Flexibility - Flights Climbed - Functional Strength Training - Golf - HIIT - Hiking (Workout) - Indoor Cycling (Workout) - Indoor Time Cycling (Workout) - Jump Rope - Meditation - Mindful Minutes - Mixed Cardio - Outdoor Cycling (Workout) - Outdoor Time Cycling (Workout) - Pilates - Resting Calories Burned - Rowing - Running (Workout) - Skating - Sleeping (Beta) - Soccer - Stair-Stepper - Stand Hour - Standing - Steps - Swimming Distance - Swimming Strokes - Tennis - Time Cycling (Workout) - Time in Daylight - Time Rowing - Time Skating - Total Calories Burned - Traditional Strength Training - Volleyball - Walking (Workout) - Walking/Running - Walks (Workout) - Water - Wheelchair Distance - Wheelchair Pushes - Yoga
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.
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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.
