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
Math Assist+
Version of 'Math Assist' which is free of adds
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
4 ratings · Top 5%
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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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/
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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 Math Assist+: map the core Reference 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
Expand database of problems to include various topics.
Assumption to check: Limited problem types covered
Validate with people who use this workflow before building.
Hypothesis 2
Provide clear communication on what features are premium.
Assumption to check: In-app purchases may confuse users
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate diagrams or animations to enhance understanding.
Assumption to check: Lack of visual aids for explanations
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to download content for offline access.
Assumption to check: No offline capabilities
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
Version of 'Math Assist' which is free of adds. Designed to help you survive the rigor of college by supplying more than 360 math and calculus tables along with explanatory pictures. This version allows more information to be displayed with less power consumption. All references are designed for clear viewing. Pinch and zoom to get a closer look at a graph, picture, or written formula. This application will supply you with everything you need through the first year (maybe two) of math. You will find the organization and flow will simplify your search. The interface allows quick location of your formulas- including Algebra, Trigonometry, Derivatives, and Integrals. Each of these topics contains a single-click entry to a definitions to 5 to 10 pages of important formulas and information. The current list of topics is: Geometry: -Contents of topics by topic or entry -Glossary of terms (97) -Angle pairs -Angles -Circles (circles, annulus) -Lines (line, segment, ray) -Plane triangle -Points -Polygons -Quadrilaterals -Relationship of lines/angles -Triangles Algebra: -Arithmetic, -Constants -Complex numbers -Cubic/quadratic formula -Exponents -Function definition -Factoring -Inequalities -Logarithms -Mean, Median, Mode, and Range of data sets -Polar coordinates -Radicals Trigonometry: -Acute angles -Addition formula -Arbitrary angles -Double angle formulas -Fundamental trigonometric identities -Graphs of trigonometric functions -Graphs of inverse trigonometric functions -Half-angle formulas -Hyperbolic definitions -Laws of Sine, Cosine, and Tangents -Trigonometry of real numbers on the unit circle -Unit circle Derivatives: -Critical and inflection points -Definition of the derivative -Exponential derivatives -General rules -Notation for higher order derivatives -Derivatives of Hyperbolic geometry -Derivatives of Trigonometry Integrals: -Basic integrals -Basic trigonometric forms -Common substitutions -Definite integrals -Exponential and logarithmic forms -Green's Theorem -Hyperbolic functions -Integration by parts -Reciprocals of trigonometric forms -Substitution Rule
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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
Supabase
TypeScript
react-navigation
BUILD KIT DIFFICULTY
Starter
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.
