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
Photometer
There used to be an entire industry based on red lights, that would have nothing (or very little) to do with scarcely dressed women - they called themselves photographers.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.7
3 ratings · Below Average
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 included15 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 Photometer: 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
Integrate more measurement modes (e.g., color temperature) and user-friendly tutorials.
Assumption to check: Limited functionality for advanced light measurements
Validate with people who use this workflow before building.
Hypothesis 2
Utilize AI for better calibration and adjustment based on environmental variables.
Assumption to check: Inaccurate readings in certain lighting conditions
Validate with people who use this workflow before building.
Hypothesis 3
Design a modern, intuitive UI with clear navigation paths.
Assumption to check: Poor user interface and navigation
Validate with people who use this workflow before building.
Hypothesis 4
Implement a cloud backup feature for users to save and access their readings across devices.
Assumption to check: Lack of cloud backup for 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
There used to be an entire industry based on red lights, that would have nothing (or very little) to do with scarcely dressed women - they called themselves photographers. If you remember these times you probably call at least one of the mechanical wonders your own, which are today known as analog cameras and the best of them didn't have something called "in-camera metering" on the feature list. Well, here's an App for you - dust off your Leicas, Hasselblads and Linhofs or whatever brand you fancy, stop looking for Mercury batteries and worrying about Selenium, what you need is already in your pocket! Photometer will turn your iPhone into a reliable Exposure Meter, a modern interpretation of what it should be in times of retina displays and touch screens - for old times sake we have included a classic skin that feels and behaves just like the real thing. Now go out and start taking pictures with grain, not noise! Feature List - digital light meter - aperture or time priority - 10% steps towards the next value (white bars) - color measurement - lock measurement (grid and lock icon) - underexposure warning (only grid) - modern and classic view
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
Expo Camera
React Navigation
Expo Permissions
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.
