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
LM: Amino Acids
Learn the names, abbreviations, structures, major properties, biosynthetic pathways, and codons of the 22 amino acids found in proteins.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included16 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 LM: Amino Acids: map the core Education 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 gamification elements like badges, leaderboards, or daily challenges.
Assumption to check: Limited user engagement features
Validate with people who use this workflow before building.
Hypothesis 2
Add features for sharing achievements on social media.
Assumption to check: Lack of social sharing options
Validate with people who use this workflow before building.
Hypothesis 3
Enable offline access to course materials and quizzes.
Assumption to check: Insufficient offline capabilities
Validate with people who use this workflow before building.
Hypothesis 4
Provide detailed explanations for quiz answers to enhance learning.
Assumption to check: Limited feedback after quizzes
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
Learn the names, abbreviations, structures, major properties, biosynthetic pathways, and codons of the 22 amino acids found in proteins. This app includes multiple formats to help you test and learn information about amino acids, including: • Flash Cards: scroll through deck of cards, flip to see front and back information • Sorting Cards: swipe cards to their correct identity, or property class • Matching Games for abbreviations and major properties • a drawing module to learn structures • Codon Reader: decipher the genetic code and build proteins • an amino acid reference guide • a basic chemistry guide that allows you to visualize amino acid interactions, and explore relevant background for understanding amino acid properties (e.g., the perioidic table of elements, electron configurations, hydrogen bonds, and more...)- don't just memorize...understand This app is highly customizable, including: • reclassify properties: allows you to respecify amino acid properties for basic or advanced study, or to meet the specific requirements of your individual courses and study needs. Comes fully loaded with defaults, but gives flexibility to meet your specific needs • customize the colors of flash cards and other game elements • choose the colors of atoms and bonds in amino acid structures
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
React Navigation
Axios
TypeScript
React Native Paper
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.
