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
MathMaster - Accuracy & Speed
mathmaster: math practice made simple
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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.
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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Combine features and design from your favorite apps.
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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 included14 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 MathMaster - Accuracy & Speed: 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
Expand exercise types and difficulty levels to cater to a wider audience.
Assumption to check: Limited exercise variety in math topics
Validate with people who use this workflow before building.
Hypothesis 2
Introduce leaderboards and social sharing features to enhance engagement.
Assumption to check: No social features for competition
Validate with people who use this workflow before building.
Hypothesis 3
Implement adaptive learning algorithms to tailor exercises based on user performance.
Assumption to check: Lack of personalized learning paths
Validate with people who use this workflow before building.
Hypothesis 4
Provide detailed explanations and tips for incorrect answers to aid learning.
Assumption to check: Limited feedback on incorrect answers
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
mathmaster: math practice made simple master essential math skills through focused practice! mathmaster helps children ages 6-13 build confidence and speed in basic math operations without distracting games or animations. features: • quick 10-question practice sessions • addition, subtraction, multiplication, and division • multiple difficulty levels (numbers 1-10, 1-20, 1-100) • choice between multiple-choice or type-in answers • detailed progress tracking • common mistake identification • no ads or in-app purchases for kids: • clean, focused interface • immediate feedback • personal best tracking • encouraging messages • custom practice sets based on mistakes for parents: • detailed progress reports • practice session history • identify areas needing attention • track improvement over time • set appropriate difficulty levels what makes us different: unlike other math apps that focus on games and rewards, mathmaster helps children build real mathematical fluency through focused practice. our distraction-free approach lets kids concentrate on what matters - improving their math skills. perfect for: • elementary school students • middle school students • homeschooling • extra practice • test preparation • building math confidence privacy & safety: • no third-party advertising • no data collection • no external links • safe for children download mathmaster today and help your child build strong math foundations! terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
Axios
zustand
@react-navigation/native
Firebase
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.
