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.
App Overview
Graph Paper Gen
The Graph Paper Generator is a simple tool to generate grid paper
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
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.
Differentiate and validate
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Graph Paper Gen: map the core Productivity workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
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
Offer more advanced features like custom grid sizes and patterns.
Assumption to check: Limited customization options compared to competing apps
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to share templates with others or collaborate in real-time.
Assumption to check: No sharing or collaboration features
Validate with people who use this workflow before building.
Hypothesis 3
Implement a more visually appealing and modern UI to enhance user experience.
Assumption to check: Basic user interface that lacks modern design elements
Validate with people who use this workflow before building.
Hypothesis 4
Create a community marketplace where users can share and sell their templates.
Assumption to check: No templates library or marketplace for users
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
The Graph Paper Generator is a simple tool to generate grid paper. Save generated grid paper as image or PDF files with pre-made guides ready to print. Features: • User-friendly interface. • Add multiple grids/lines with custom settings. • Quick preview of graph paper. • Instant grid paper generator. • Option to save grid configurations as presets. • 6 preset slots available for saving or loading. • Option to save images to the camera roll. • Option to save PDFs to the Files app. • Option to print. • 3 paper templates ready for quick setup [A4, A3, and Letter]. • Custom paper size available. • Option to set paper color. • Grid configuration for grid, horizontal line, and vertical line. • Add up to 6 grid/line configurations. • Option to set grid/line spacing. • Option to set Start X or Start Y position for horizontal and vertical lines. • Option to set line thickness (range: 0.1 – 5.0). • Option to set grid/line color. • Option to set grid/line style (solid or dashed). • Simple statistics showing how many lines or grids are generated on the paper. Quick Guide: - Tap on the settings icon at the bottom left to start. - Set the desired paper size. - Choose a paper color or leave it as the default white. - Tap on the Plus icon beside the Grid Config. - Choose either Grid, Horizontal Line, or Vertical Line. - The Grid Config page will appear. - Set Grid/Line Spacing as desired. [The bottom of the page shows the total number of grids/lines to be generated. Use it as a reference.] - Set other parameters such as line thickness, line color, or line style. - Tap back to the main page for a preview. - Use the preview mode to check the grid paper — you can zoom and pan for detail. - When finished, you can save it to the camera roll as an image or save it as a PDF file for printing. Save Presets: - Once you are done with all the settings, - You can save them as a preset by tapping on the preset button. - Tap on Save Preset. - Tap on any empty slot and the preset will be saved. - You can tap on any slot to overwrite it if you want to. Load Presets: - Tap on the preset button. - Tap on Load Preset. - Tap on any preset slot and it will load automatically. Thanks for your support, and please visit nitrio.com for more apps for your iOS devices.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
Supabase
Zustand
react-navigation
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BUILD KIT DIFFICULTY
Intermediate
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.
