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.
Newton's Cradle is a classic desk toy that makes a fun conversation piece and fits perfectly on a desktop or coffee table.
$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 Newton's Cradle Plus: map the core Entertainment 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: Lack of user engagement features like sharing or competing with friends
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited customization options
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Absence of educational content
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No sound effects or background music
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.
Newton's Cradle is a classic desk toy that makes a fun conversation piece and fits perfectly on a desktop or coffee table. Beside Demonstrates Newton's Laws of Motion, These swinging balls will help you occupied for hours at work. Features: • Able to set background colour. • Able to set random colour on ball collision. • Able to show or hide ball collision count from start to stop. • Able to play or mute tick sound on ball collision. • Able to set the energy loss rate of Newton's cradle, which will affect how long it'll take to finish. • Able to set the speed of Newton's cradle. • Able to set the HDR display for vivid color [for Super Retina Display or Super Retina XDR devices only]. • Simulate energy loss over time, from beginning movement to stop. • Support both portrait and landscape orientations. Newton's cradle, also called a Newton's rocker or a ball clicker are often used as a relaxing diversion on the desk. Newton's cradle is a device that demonstrates conservation of momentum and energy using a series of swinging spheres. When one sphere at the end is lifted and released, it strikes the stationary spheres, transmitting a force through the stationary spheres that pushes the last sphere upward. It was so-named in 1967 by English actor Simon Prebble, in honor of his countryman and revolutionary physicist Isaac Newton. Newton's Cradle is a device that not only demonstrates a pendulum, but also shows the Laws of Conservation of Momentum and Energy. When one ball on the end is lifted and released, the resulting force travels through the line and pushes the last ball upward. Because it uses Newton's Laws, it was named after Sir Isaac Newton, English physicist, mathematician and astronomer. Each ball acts like an individual pendulum. At rest all the balls are touching. When you lift one of the end balls and let it hit the resting balls, only the ball at the other end moves, and the initial ball stops at rest. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.
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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.