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
Vintage Camera - Goodak
Some moments may have slipped away in our life, but will last forever in our memory, Now you can turn iPhone into a vintage disposable camera, so that you take each photo looks so unique, full of charm and moving, Goo...
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
42 ratings · Top 30%
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 included17 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 Vintage Camera - Goodak: 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 filter library and allow user-generated filters.
Assumption to check: Limited filter options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Optimize filter rendering and preview loading.
Assumption to check: Slow loading times for filter previews
Validate with people who use this workflow before building.
Hypothesis 3
Improve app stability and performance on a wider range of devices.
Assumption to check: Occasional crashes on older devices
Validate with people who use this workflow before building.
Hypothesis 4
Clarify pricing and benefits of premium features in the app.
Assumption to check: In-app purchase confusion
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
Some moments may have slipped away in our life, but will last forever in our memory, Now you can turn iPhone into a vintage disposable camera, so that you take each photo looks so unique, full of charm and moving, Goodak® lets you express even the most subtle mood on your photos. + CLASSIC DISPOSABLE CAMERA + Enhance your images with random films. + Photo album import feature. + Dynamic photo albums selection. + Other adjustable edit function. + Automatically load date watermark. + Random film photographic lens. + Custom Date (Recall Past). + Black & white and Lomo cameras. + Viewfinder Switching Function. Goodak is provided as Goodak Studio® own product. Thanks for using! We're working on new features and constantly working to improve your experience! If you have any questions or feedback, please contact us: http://www.psdc.com.tw DISCLAIMER NOTICE Goodak is provided as Goodak Studio own product. this app is not the official app of Kodak and Fuji or any others. Goodak made every effort to ensure not to infringe other's copyrights or trademarks.
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
react-navigation
expo-camera
@react-native-async-storage/async-storage
expo-image-manipulator
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.
