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
Keystone Biology Practice Test
This app has two practice tests, each with two modules for a total of 132 multiple choice questions and their answers
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.5
11 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 included13 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 Keystone Biology Practice Test: 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
Incorporate more diverse question types, like fill-in-the-blank.
Assumption to check: Limited question variety
Validate with people who use this workflow before building.
Hypothesis 2
Implement rigorous testing and user feedback loops to identify issues.
Assumption to check: Low ratings due to bugs
Validate with people who use this workflow before building.
Hypothesis 3
Enhance UI/UX with modern design principles and user-centric features.
Assumption to check: Poor user interface
Validate with people who use this workflow before building.
Hypothesis 4
Clarify pricing structure and provide clear value propositions for premium content.
Assumption to check: In-app purchase confusion
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
This app has two practice tests, each with two modules for a total of 132 multiple choice questions and their answers. Some of the multiple choice questions emulate constructed-response type questions. The practice tests simulate the actual test environment and typical questions asked on the real test. These practice tests cover most of the possible questions likely to appear on the computer based test and will help you prepare by testing your knowledge. Simulating the actual test experience when using this app will help you overcome some of the pre-test jitters before taking the actual test. The practice test app includes: * 132 Multiple-choice questions in two tests, each with two modules * Answer key * Pop-up calculator * Navigator to select questions in any order and status of how many questions you've completed * Flag selection to allow you to come back to a question * Scoring screen with estimated Keystone Biology score * Optional 75 minute timer to help you complete the test on time * Share your test results on Facebook and Twitter This product is NOT affiliated with or endorsed by Data Recognition Corporation (DRC).
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
Zustand
React Navigation
React Native Paper
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.
