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
ROLLIE'S: 35mm Film Camera
A little camera shop in your pocket.
$6.99 · In-app purchases
OVERALL US RANK
#72
Paid · all categories
REVENUE (Est)
$109K/mo
$61K - $157K
RATING
★ 4.6
16 ratings · Top 15%
Evidence scope: #72 is the current overall US Paid chart position. 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 included
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 ROLLIE'S: 35mm Film Camera: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
A little camera shop in your pocket. Choose a camera. Pick a lens. Load a roll. Every combination has its own look, baked live into the viewfinder before you ever press the shutter. No sliders, no presets to scroll: you compose the feel by choosing your gear, the way you would with real film. A roll is 36 shots, and there is always another: every film on the shelf is yours, roll after roll. • A real optical pipeline — body color science, lens character, and film stock, layered the way light actually stacks up • Live viewfinder preview: what you see is what develops • 100 film stocks, each with its own mood — pastel, golden, green, black & white and more • Everything is included — no ads, no subscription, no in-app purchases • Your photos stay on your device. No account, no sign-in. Shoot your day the way it felt.
Written user reviews are not shown here. Check current App Store reviews >
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
Offer a wider range of customizable filters.
Assumption to check: Limited filter options compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Implement cloud storage for user photos.
Assumption to check: No cloud backup for saved photos.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation with clearer icons and labels.
Assumption to check: Difficult to navigate between modes.
Validate with people who use this workflow before building.
Hypothesis 4
Add options to share photos directly to social media.
Assumption to check: Lacks social sharing features.
Validate with people who use this workflow before building.
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
Zustand
react-navigation
expo-camera
expo-image-picker
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
