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
GetMyROM
Measure Range of Motion (ROM) simply and Easily with 3 taps.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.0
3 ratings · Below Average
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 GetMyROM: 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 library of exercises with video demonstrations.
Assumption to check: Limited exercise variety and detailed instructions
Validate with people who use this workflow before building.
Hypothesis 2
Focus on enhancing the user interface and experience.
Assumption to check: Poor user ratings indicating usability issues
Validate with people who use this workflow before building.
Hypothesis 3
Integrate social features for users to share progress and support each other.
Assumption to check: Lack of community features for motivation
Validate with people who use this workflow before building.
Hypothesis 4
Implement thorough testing and optimization to improve app stability.
Assumption to check: Inconsistent performance and bugs
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
Measure Range of Motion (ROM) simply and Easily with 3 taps. Forget your Goniometer and GetMyROM. Celebrating over 5 years in the App Store Research: Inter-rater reliability ICC of 0.92 to 0.94 vs Standard Goniometer at 0.91 for shoulder ER. http://www.ncbi.nlm.nih.gov/pubmed/24654927 Findings demonstrated a strong positive correlation between the GetMyROM app and the digital inclinometer for measuring passive ROM of the elbow (r=.98, p<.01) and wrist (r=.97, p<.01) http://www.cmnzl.co.nz/assets/Docs/APOTC%20abstracts%20session%2002.pdf Turn your iPhone® or iPod Touch into a Digital Inclinometer Measure your Range of Motion (ROM) quickly and easily with your iPhone® or iPod Touch™. For PTs, OTs, Physicians, Nurse Practitioners, Chiropractors, ATCs, Personal Trainers and other health and fitness professionals. * Simple and intuitive user interface * Add Notes to your ROM measurements * Record Start/Stop and Total Joint Range of Motion * Select Side of Body (Left/Right) * Select Joint (Shoulder/Hip/Knee etc) * Select Motion (Flexion/Extension/Abduction etc) * More accurate and easy to read than a standard bubble inclinometer * It includes the ability to save joint ROM by date and time Designed by a PT to help improve the reliability and validity of ROM measurements
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
Supabase
react-native-reanimated
expo-notifications
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.
