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
Papertone
Papertone is a simple, elegant note-taking app inspired by the golden era of iOS — complete with skeuomorphic textures, lined paper backgrounds, and nostalgic charm
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 ratings · Top 5%
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 included16 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 Papertone: 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
Incorporate more advanced features like recurring tasks and reminders.
Assumption to check: Limited features compared to other productivity apps
Validate with people who use this workflow before building.
Hypothesis 2
Focus on stability and performance optimization during development.
Assumption to check: Inconsistent performance and crashes reported by users
Validate with people who use this workflow before building.
Hypothesis 3
Implement cloud synchronization for seamless access across devices.
Assumption to check: Lack of cloud sync options
Validate with people who use this workflow before building.
Hypothesis 4
Enhance customer support with in-app chat and timely responses.
Assumption to check: Poor customer support responsiveness
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
Papertone is a simple, elegant note-taking app inspired by the golden era of iOS — complete with skeuomorphic textures, lined paper backgrounds, and nostalgic charm. Everything is built to feel like a physical notebook — soft shadows, realistic textures, and a retro Apple-style interface. Here's what you need to know: • Tap the + button in the top-right corner to create a new note. • Need to find something? Pull down on your notes list to reveal the search bar. • Tap to edit button to make changes on the note. • Don't forget, first line of the note will be the title. • Want to access settings? Tap the "Notes" header 5 times — it's a hidden shortcut to keep the interface clean. From the settings menu, you can: • Switch between 12-hour and 24-hour time formats • Import or export your notes • Delete all notes (careful, this can't be undone) Just open and start writing — no distractions, no complexity. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
React Native Paper
BUILD KIT DIFFICULTY
Starter
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.
