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.
Long Division helps students learn and practice the standard long division method step by step.
$3.99 · 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.
Your first Build Kit is free with a verified email.
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.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Long Division helps students learn and practice the standard long division method step by step. The app shows each part of the long division process visually. Students divide, multiply, subtract, and bring down digits one step at a time. Animated numbers move into place, helping students understand where each part of the calculation belongs. Long Division can be used for classroom teaching, individual practice, tutoring, or homework support. Problems can be generated randomly or entered manually. Features: - Step-by-step long division practice - Dividend can have 1–5 digits - Divisor can have 1–3 digits - Supports remainders - Supports decimal dividends and divisors - Can extend the division to additional decimal places - Divisor can be larger than the dividend - Optional highlighting of the current operation - Current operation can be hidden for extra challenge - Adjustable animation speed - Customizable colors and settings - Random or manually entered problems Reviews and Recognition: Featured by Apple in “New & Noteworthy,” “Math - Numbers & Operations,” and “Math Apps for Middle School.” Educational App Review / IEAR: “This app is fantastic!!” Wired.com: “The Long Division app is very clear and very useful.” Teacher endorsement: “The Math apps by Esa Helttula allow students to practice and reinforce the specific computation strategies taught in class, with as much or as little scaffolding as necessary. I am so glad to have come across this great educational tool!” — R. Zeni, Ecole Sandy Hill Elementary, Abbotsford, BC, Canada Privacy: This app has no ads, no in-app purchases, and does not transmit user data during operation. The app also does not contain links to other apps or to the web.
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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.
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.
Not assessed in a Build Kit yet.
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.