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
Light Meter by WBPhoto
The essential light meter app for film and digital photography
$6.99 · In-app purchases
PRICE
$6.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
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 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 Light Meter by WBPhoto: 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
Add advanced calibration settings for various scenarios.
Assumption to check: Limited calibration options for different lighting conditions
Validate with people who use this workflow before building.
Hypothesis 2
Implement onboarding tutorials to guide new users through features.
Assumption to check: Confusing user interface for beginners
Validate with people who use this workflow before building.
Hypothesis 3
Enable sharing functionality for users to share settings and results via social media.
Assumption to check: Lack of sharing features for results
Validate with people who use this workflow before building.
Hypothesis 4
Introduce offline capabilities to allow usage without internet access.
Assumption to check: No offline functionality
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
The essential light meter app for film and digital photography. Turn your phone into a precision spot meter trusted by 400,000+ photographers worldwide. PRECISION EXPOSURE METERING • Spot meter with tap-to-focus exposure points • Multi-point spot metering — pin and compare dynamic range • Zone System metering — assign zones (0–X) to readings • Exposure preview for compensation and ND offsets • Volume button to start/stop metering • Calibrated against professional Gossen and Sekonic meters ZONE PLACEMENT CALCULATOR • Place readings on zones, see target exposure instantly • Grayscale swatches show how each reading renders • Dynamic range warnings for high-contrast scenes • Send directly to Bracket Calculator AR RANGEFINDER • Point at your subject, read distance in feet or meters • Perfect for manual focus film cameras with no built-in rangefinder • LiDAR precision on iPhone Pro (centimetre accuracy up to 5 m) • ARKit scene tracking on all other supported iPhones • Precise mode for the exact number; Zone mode for macro/near/mid/far • Send readings directly into the Depth of Field Calculator YOUR COMPLETE PHOTOGRAPHY TOOLKIT — 13 CALCULATORS • Rangefinder — AR subject-distance measurement • DOF — Hyperfocal distance, near/far focus limits • Reciprocity — 40+ film stocks (Portra, Tri-X, HP5, CineStill, and more) • Bracket Calculator — Exposure bracketing with custom steps • Pinhole Calculator — Effective f-stop for pinhole cameras • EV/LV Converter • White Balance • Bellows Factor • Flash Guide Number • EXIF Reader • Angle of View • Zone Placement • Sunny 16 GOLDEN HOUR & BLUE HOUR • Sunrise, sunset, golden hour, and blue hour times PROFESSIONAL FEATURES • Custom ISO, shutter, f-stop ranges • Half-stop and third-stop increments • Shutter angle mode for cinematographers • Live histogram • ND filter display • Foot-candles and Lux • Exposure timer SAVE & ORGANIZE • Log exposures with GPS and notes • Hardware profiles for your gear • Export and reference past readings Film SLR • Medium format • Large format • Pinhole • Digital mirrorless 50+ languages • Home screen and lock screen widgets • No internet required
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
Zustand
Axios
React Native Reanimated
React Navigation
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.
