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
Instant Lines
• One-click Image to line Art
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
24 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 included18 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 Instant Lines: map the core Photo & Video 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
Expand toolset to include more features such as advanced filters and AI enhancements.
Assumption to check: Limited editing tools compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Improve stability and optimize memory usage.
Assumption to check: Occasional crashes during photo imports.
Validate with people who use this workflow before building.
Hypothesis 3
Add social features for sharing projects and collaborating.
Assumption to check: No community features for sharing edits.
Validate with people who use this workflow before building.
Hypothesis 4
Offer flexible pricing or a one-time purchase option for essential features.
Assumption to check: High subscription cost for premium features.
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
• One-click Image to line Art Whether the original image is flat or three-dimensional, the line draft can be completely recognized. • AI-enhanced clarity Using AI to enhance the clarity of blurry original images for a clearer line art. • Batch Extraction Import multiple pictures at one time to extract line draft, which is more efficient. • Transparent Background You can choose to save the pure white background, or remove the background and keep only the line art. • Adjustable Line Art Thickness Slide to adjust the thickness of the line draft, and the window can preview in real time until you select a satisfactory thickness. • Compare the Original Image When adjusting the line art, you can compare the original image with one click. • Multiple Uses of Line Art It can be exported to drawing software such as Procreate for the next drawing; Covering the line draft with translucent paper can effectively practice drawing lines. If you have any questions or suggestions, please contact the email: [email protected] Artwork credits @yuruyakazou @nazuna_higurasi
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
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react-navigation
react-native-reanimated
expo-image-picker
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.
