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.
Spiral - The Ultimate Pocket Notepad
$0.99
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.
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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.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Spiral - The Ultimate Pocket Notepad Spiral is the perfect application for lovers of pocket-sized paper notepads who want to take quick notes, draw, sketch, doodle, and more! All these things can be done by simply "drawing" on the application with your finger. Spiral uses a world-class drawing engine that provides smooth lines and a fluid writing experience. We worked very hard to make using Spiral feel like writing on an actual notepad, and we're proud of what we built. Designed specifically for the smaller size of the iPhone, Spiral gives the power and features of notepad applications available only on the iPad in a way that works well on a smaller screen. Spiral offers the following features: • draw with pen, highlighter, and eraser drawing tools with enhanced effects to make writing with the app feel like writing on paper • write on unlimited pages • add a picture from the camera or photo library to a page • create a PDF of the entire notepad or just a single page of the notepad • email the notepad or a page • text message the notepad or a page • save pages to the photo library • share pages on popular social media services such as Facebook and X • print the notepad or a page via AirPrint • draw with multiple line widths • draw with multiple colors • feel free to experiment with multi-level undo and redo • clear your drawing, background, or delete a page • rotate the contents of a drawing • make the app look how you like with five styles of paper and the option to use a simple white drawing surface • view an interactive tutorial that shows you how to use the application Give Spiral a try today!
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.