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
NightPaper
NightPaper is a focused, atmospheric read-only reader for PDF and text-based documents, designed for calm, immersive reading on supported modern iPhone and iPad devices.
$1.99 · In-app purchases
PRICE
$1.99
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 NightPaper: map the core Books 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 user reviews and discussion forums for books
Assumption to check: Limited user engagement features such as reviews or community interactions
Validate with people who use this workflow before building.
Hypothesis 2
Implement an algorithm for personalized book suggestions based on user preferences
Assumption to check: Lack of personalized recommendations
Validate with people who use this workflow before building.
Hypothesis 3
Add support for offline reading to enhance user experience
Assumption to check: No offline reading capabilities
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the subscription model or offer a pay-per-use option
Assumption to check: Subscription fatigue due to multiple tiers
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
NightPaper is a focused, atmospheric read-only reader for PDF and text-based documents, designed for calm, immersive reading on supported modern iPhone and iPad devices. NightPaper 1.0 is designed for reading only and does not include document editing features. Supported formats: • PDF • TXT • Markdown • RTF Features: • Minimal, distraction-free reading experience • Retro, Dark, Light, and Custom display presets • Retro mode offers a softer, more comfortable reading experience in darker environments • Custom mode lets you fine-tune brightness, contrast, and warmth to match your own reading preferences • Ambient background audio for a more immersive reading session • Dark reading support for vector-based PDFs • Dark reading support for TXT, Markdown, and RTF documents • Custom display controls for brightness, contrast, and warmth PDF behavior: To ensure stable performance and reliable native text interaction, some PDF features are handled through Light mode. Text actions such as Look Up, Copy, and Share are available through the Light-mode reading path. Scan-based and very large PDFs may also open in Light mode automatically for better performance and visual stability. Device support: NightPaper 1.0 is officially optimized for selected newer iPhone and iPad models. Older devices are not officially supported in this version. Officially supported iPhone models: • iPhone 12 mini, iPhone 13 mini • iPhone 12, iPhone 12 Pro, iPhone 12 Pro Max • iPhone 13, iPhone 13 Pro, iPhone 13 Pro Max • iPhone 14, iPhone 14 Pro, iPhone 14 Plus, iPhone 14 Pro Max • iPhone 15, iPhone 15 Pro, iPhone 15 Plus, iPhone 15 Pro Max • iPhone 16, iPhone 16e, iPhone 16 Pro, iPhone 16 Plus, iPhone 16 Pro Max • iPhone 17, iPhone 17e, iPhone 17 Pro, iPhone 17 Pro Max • iPhone Air Officially supported iPad models: • iPad mini (6th generation), iPad mini (A17 Pro) • iPad (10th generation), iPad (A16) • iPad Air 11-inch (M2, M3) • iPad Air 13-inch (M2, M3, M4) • iPad Pro 11-inch (3rd generation, 4th generation, M4, M5) • iPad Pro 12.9-inch (5th generation, 6th generation) • iPad Pro 13-inch (M4, M5) NightPaper is built for reading — slower, quieter, and more intentional.
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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.
SUGGESTED BUILD STACK
React Native
Expo
Supabase
React Query
Zustand
react-native-gesture-handler
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.
