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
Photo Extension Histogram
** ESSENTIAL PHOTO UTILITY **
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.9
19 ratings · Top 50%
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 Photo Extension Histogram: 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
Include more editing tools like filters and cropping.
Assumption to check: Limited editing features compared to full-fledged editing apps.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize performance and stability for various devices.
Assumption to check: App crashes on certain devices.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation and include onboarding tutorials.
Assumption to check: User interface can be confusing for beginners.
Validate with people who use this workflow before building.
Hypothesis 4
Make premium features more visible and accessible.
Assumption to check: In-app purchases can be hard to find.
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
** ESSENTIAL PHOTO UTILITY ** Photo Extension Histogram provides Tonality, RGB Channels, and Luminosity histograms for photos stored in the Apple Photos app for iPhone and iPad. This extension is great for photographers who need to analyze the tonal and color distribution of photos to identify underexposure, overexposure, and appropriate levels of contrast. The extension also explains, advises, and guides you on how to understand each histogram to be a great photographer! To use this extension, open the Apple Photos app, select any photo, tap the Action button, and then select the Photo Extension. You can also use the extension when editing photos. Photo Extension Histogram: + Quick and easy to use. + Supported in most photo apps Action button. + Works on the iPhone and iPad. + Available from Action Extension or Edit Extension. + Shows Tonality Histogram. + Shows RGB Channel Histogram. + Shows Luminosity Histogram. + Provides advice about dark, light, and mid-tones. + Provides advice about high and low contrast. + Explains each histogram in plain English for everyone to understand. + Save photo with the histogram in the Photo Library. MORE APPS: Check out all our apps at https://digiguys.com SUPPORT: We are here to help https://www.digiguys.com/help FACEBOOK PAGE: Join our Facebook Page for tips, ideas, support, and much more... be part of the community! https://www.facebook.com/digiguysapps
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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Zustand
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.
