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
Fieldlight — 35mm Light Meter
Fieldlight is a fast, practical light meter for 35mm film photographers.
$0.99
PRICE
$0.99
No 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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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 included16 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 Fieldlight — 35mm Light Meter: 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
Provide tooltips or help sections explaining each setting.
Assumption to check: Users may find it hard to interpret EV values and settings
Validate with people who use this workflow before building.
Hypothesis 2
Implement a graph view for historical measurements.
Assumption to check: Limited measurement history visibility
Validate with people who use this workflow before building.
Hypothesis 3
Include calibration presets for popular camera models.
Assumption to check: Lack of calibration options for different camera types
Validate with people who use this workflow before building.
Hypothesis 4
Enable export option to share readings via email or social media.
Assumption to check: No sharing feature for saved measurements
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
Fieldlight is a fast, practical light meter for 35mm film photographers. Tap the live preview to meter a scene. Fieldlight estimates scene brightness and recommends aperture, shutter speed, and ISO settings using camera-aware exposure calculations. The result stays large, readable, and easy to set on your camera. Built for film photographers: - Aperture, shutter, and ISO priority modes - Film ISO lock for loaded rolls - Optional digital dynamic ISO mode - Spot and average metering - Camera profile limits for aperture and shutter speed - Handheld shutter warnings - Exposure compensation - Lightweight shot log - Last measured exposure in Live Activities and Dynamic Island on supported iPhone models Fieldlight is designed as a field tool: high contrast, minimal controls, and no account required. Meter quickly, read the recommendation, and keep shooting.
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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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.
