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
LymVol Limb Volume Calculator
LymVol has been specially designed and developed to help Lymphoedema professionals measure and calculate the limb volume of those affected by oedema.
$22.99 · In-app purchases
PRICE
$22.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.0
1 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.
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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.
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 LymVol Limb Volume Calculator: map the core Medical 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 features like user profiles and data visualization.
Assumption to check: Limited user engagement due to lack of features
Validate with people who use this workflow before building.
Hypothesis 2
Implement a cleaner UI with better organization.
Assumption to check: Difficult to navigate with cluttered UI
Validate with people who use this workflow before building.
Hypothesis 3
Offer a free trial and showcase benefits clearly.
Assumption to check: High price point without clear value proposition
Validate with people who use this workflow before building.
Hypothesis 4
Enhance support with in-app chat and feedback options.
Assumption to check: Poor customer support and feedback loop
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
LymVol has been specially designed and developed to help Lymphoedema professionals measure and calculate the limb volume of those affected by oedema. The method of calculation used in this application is a recognised mathematical and medical standard for measuring limb volume. It is calculated through the measure and addition of cyclindrical 4cm sections of both the Distal and Proximal for each limb. The app also includes a BMI calculator and a complete set of instructions for how to measure limbs accurately and effectively. Results of calcuation include: Distal, Proximal and total volume(s) for each limb. Total excess in mls and as a percentage for affected limb. Difference in volume in mls, as a percentage and as a ratio for both Distal and Proximal. Distal/Proximal ratio. LymVol was designed and developed by the Lymphodema Training Academy which is backed by a team of leading experts with over 240 years collaborative experience. With the Lympheodema Training Academy, you can be sure of the most evidence-based practice and training in the field. Copyright Lymphoedema Training Academy, all rights reserved. LymVol® is a registered trademark of Lymphoedema Training Academy 2019.
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-navigation
react-native-paper
@react-native-async-storage
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.
