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.
▸ 2012 Editor's Choice Award! - Children's Technology Review
$1.99 · 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 Monster Physics®: 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 interactivity in lessons
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of noticeable feedback on progress
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited content updates
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.
▸ 2012 Editor's Choice Award! - Children's Technology Review ▸ "a fun, educational app that hits the mark with kids" - The iPhone Mom Monster Physics® is a unique building app that lets you play with physics! Build and operate your own car, crane, rocket ship, plane, helicopter, tank and more! BUILD IT: Set your imagination free! Build intricate, working contraptions with over 68 different parts including wheels, rockets, propellers, cannons, magnets, claws, wings and more. Choose from different materials including metal, wood, plastic, rubber and ice. Connect parts together by welding them, drawing a rope or chain between them with your finger or using special dynamic joints to bring them to life. Once your invention is complete, Monster Physics® will render it with it's built-in physics engine and let you actually operate your creation in real time. You can drive your car, operate your crane, guide your rocket into space or fly your helicopter! The possibilities are limited only by your imagination. SOLVE IT: Think outside the box! Monster Physics® comes with 50 missions for you to solve including simple tutorials as well as mind-bending challenges. Many of the missions are open-ended and can be solved with a wide variety of different solutions so you can play them over and over again. Players will learn problem-solving and creative-thinking skills while having tons of fun. LEARN IT: Have fun while learning! Players learn physics "hands on" through solving missions and building and refining their own inventions. In addition, a separate learn section introduces players to basic physics concepts such as friction, force, mass, acceleration and more. FEATURES: ▸ Create your own monster avatar ▸ Design and operate your own inventions ▸ Solve 50 fun missions ▸ Build with 68 different parts ▸ Learn common physics terms ▸ Create up to six player profiles ▸ Enjoy fun sound effects and music ▸ Powered by a realistic physics engine ▸ Retina support ▸ Works on both iPhone and iPad - a universal app Suggested age range: 10 to 110 PRIVACY DISCLOSURE Monster Physics®: - 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. 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 >
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.