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
SendPaper
Sendpaper
$9.99 · In-app purchases
PRICE
$9.99
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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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/
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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for SendPaper: 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
Implement a rich text editor with easy-to-use formatting tools.
Assumption to check: Users often struggle with document formatting options.
Validate with people who use this workflow before building.
Hypothesis 2
Add features like document versioning and status tracking.
Assumption to check: Limited document tracking and management features.
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate push notifications and updates on document status.
Assumption to check: Inadequate notifications for sent documents.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance the restore purchases feature to be more user-friendly.
Assumption to check: Difficulty in restoring purchases after reinstalling the app.
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
Sendpaper Sendpaper turns Safari into a one-tap way to get web articles onto your reMarkable paper tablet. Found a long read, a blog post, or documentation you'd rather read on e-ink than on a screen? Tap the toolbar button and Sendpaper strips out the ads, sidebars, and clutter, converts the page into a clean EPUB, and sends it to your reMarkable cloud — where it syncs to your device like any other document. Works on both Mac and iPhone, right inside Safari. FEATURES • One-tap send from the Safari toolbar • Clean reader-style conversion — just the article, no clutter • Sends as EPUB (reflowable e-book) or as a converted notebook • Optional: include or skip images • Private by design — pages are converted on your device HOW IT WORKS 1. Enable the Safari extension: Mac: Safari → Settings → Extensions iPhone: Settings → Safari → Extensions 2. Connect your reMarkable account once using a one-time pairing code. 3. Open any article, tap the button, and it's on your reMarkable. PRIVACY Your pages are processed locally and sent directly to reMarkable's cloud using your own account connection. Sendpaper has no servers of its own and collects nothing. ——— Unofficial app. Sendpaper is independently developed and is not affiliated with, endorsed by, or connected to reMarkable AS. "reMarkable" is a trademark of its respective owner. Requires a reMarkable account.
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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.
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BUILD KIT DIFFICULTY
Advanced
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.
