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
Presidents vs. Aliens®
From the creator of Stack the States!
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.2
148 ratings · Top 30%
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 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 Presidents vs. Aliens®: 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 a wider range of topics and question types.
Assumption to check: Limited question variety can make the app feel repetitive.
Validate with people who use this workflow before building.
Hypothesis 2
Provide hints or explanations for each question.
Assumption to check: Some users report difficulty understanding question phrasing.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the purchase process and make pricing clearer.
Assumption to check: In-app purchases for additional content can be confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Add more dynamic visuals and feedback during quizzes.
Assumption to check: Lack of engaging animations can reduce excitement.
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
From the creator of Stack the States! - "An educational app at its best!" - The iPhone Mom.com Presidents vs. Aliens® makes learning about the presidents fun! As you learn presidential facts, quotes, nicknames and historical events, you can use your knowledge to help the presidents defeat the aliens. Fling the presidents at the aliens to knock them all down. Use the many special objects and "Executive Powers" to increase the fun! You earn a random president for every successfully completed level. All of your presidents appear on your own personalized screen. Try to collect all 45! As you earn more presidents, you begin to unlock the free bonus games: Heads of State! and Executive Order! Three games in one! CONTROL YOUR OWN EXPERIENCE: You can select which types of questions are asked. Younger kids can start by just focusing on identifying the presidents. Older kids and adults can delve deeper into historical events and presidential facts. LEARN BEFORE YOU PLAY: Presidents vs. Aliens™ provides 45 informative president flash cards. Use them to brush up on your presidential knowledge before you play or as a handy reference tool. HAVE FUN LEARNING ALL ABOUT THE PRESIDENTS OF THE UNITED STATES: ▸ Pictures ▸ Political Party ▸ Predecessors and Successors ▸ Nicknames ▸ Quotes ▸ General Facts ▸ Historical Events FEATURES: ▸ Hundreds of unique questions ▸ 45 flash cards -- one for each president! ▸ Collect all 45 presidents and track your progress on personalized screen ▸ Earn FREE bonus games: Heads of State! and Executive Order! ▸ Works on both iPhone and iPad - a universal app ▸ Create up to five player profiles ▸ Choose any of the presidents as your avatar ▸ High resolution pictures of famous presidential landmarks ▸ All games are powered by a realistic physics engine ▸ Fun sound effects and music ▸ Retina Display support THREE GAMES IN ONE: PRESIDENTS VS. ALIENS®: Fling the presidents at the aliens. Try to knock them all down. HEADS OF STATE: Presidents are floating in space! Tap the correct ones before you get three strikes. EXECUTIVE ORDER: Drag and drop the presidents to arrange them in the correct order. Presidents vs. Aliens® is an educational app for all ages that's actually FUN to play. Try it now and enjoy three games for the price of one! PRIVACY DISCLOSURE: Presidents vs. Aliens®: - Does not contain 3rd party ads. - Does not contain in-app purchases. - Does not contain integration with social networks. - Does not use 3rd party analytics / data collection tools. - Does include links to apps by Dan Russell-Pinson in the iTunes App Store (via LinkShare). For more information on our privacy policy please visit: http://dan-russell-pinson.com/privacy/
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
zustand
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.
