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.
- Featured on the TODAY show!
$2.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Stack the Countries®: 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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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
Assumption to check: Limited content updates can make the app feel stale.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: In-app purchases can be expensive for some users.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Some users find the quiz difficulty inconsistent.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of social features for competition.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
- Featured on the TODAY show! - Editor's Choice Award! - Children's Technology Review - "Stack the Countries is worth every penny and this is an educational purchase that you absolutely will not regret." - The iPhone Mom Stack the Countries® makes learning about the world fun! Watch the countries actually come to life in this colorful and dynamic game! As you learn country capitals, landmarks, geographic locations and more, you can actually touch, move and drop the animated countries anywhere on the screen. Carefully build a stack of countries that reaches the checkered line to win each level. You earn a random country for every successfully completed level. All of your countries appear on your own personalized maps of the continents. Try to collect all 193! As you earn more countries, you begin to unlock the free bonus games: Map It! and Pile Up! Three games in one! CONTROL YOUR OWN EXPERIENCE: You can choose to focus on just one specific continent or play the whole world. You can also select which types of questions are asked. LEARN BEFORE YOU PLAY: Stack the Countries provides 193 country flash cards and colorful interactive maps of the continents. Use them to brush up on your world geography before you play or as a handy reference tool. HAVE FUN LEARNING ALL ABOUT THE COUNTRIES OF THE WORLD: ▸ Capitals ▸ Landmarks ▸ Major Cities ▸ Continents ▸ Border Countries ▸ Languages ▸ Flags ▸ Country Shapes FEATURES: ▸ More than 1000 unique questions ▸ 193 flash cards -- one for each country! ▸ Interactive maps of the continents ▸ Collect all 193 countries and track your progress on personalized maps ▸ Earn FREE bonus games: Map It! and Pile Up! ▸ Play in English, Spanish and French ▸ Works on both iPhone and iPad - a universal app ▸ Create up to six player profiles ▸ Choose any of the friendly-looking countries as your avatar ▸ High resolution pictures of famous world landmarks ▸ All games are powered by a realistic physics engine ▸ Fun sound effects and music ▸ iPhone 4 Retina Display support THREE GAMES IN ONE: STACK THE COUNTRIES: Build tall piles of countries and try to reach the checkered line. MAP IT: Tap the location of the selected country on the map. Try to complete the whole continent! PILE UP: The countries are piling up! Identify and tap them quickly to get rid of them before they reach the top. Stack the Countries® 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: Stack the Countries®: - 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 Performance Horizon). For more information on our privacy policy please visit: http://dan-russell-pinson.com/privacy/
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.