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
FaceApp: Perfect Face Editor
FaceApp makes photo editing simple and natural
Free · In-app purchases
OVERALL US RANK
#87
Grossing · all categories
REVENUE (Est)
$371K/mo
$203K - $538K
RATING
★ 4.7
1,784,850 ratings · Top 15%
Evidence scope: #87 is the current overall US Grossing 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 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 FaceApp: Perfect Face Editor: 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
Offer more free filters and an option to create custom filters.
Assumption to check: Limited free filters and features
Validate with people who use this workflow before building.
Hypothesis 2
Optimize image processing for faster loading.
Assumption to check: Slow loading times for high-resolution images
Validate with people who use this workflow before building.
Hypothesis 3
Implement a more user-friendly ad display system.
Assumption to check: Frequent ads interrupting user experience
Validate with people who use this workflow before building.
Hypothesis 4
Provide clearer explanations of subscription benefits and an easy-to-understand pricing structure.
Assumption to check: Subscription model may be confusing
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
FaceApp makes photo editing simple and natural. Apply subtle adjustments that fit your style while keeping results realistic. Edit photos quickly and easily - ready for sharing. Use a fantastic set of filters, backgrounds, effects, and other tools to create a seamless and photorealistic edit in ONE TAP. You will never have to spend hours photoshopping again! More than 60 highly photorealistic filters PHOTO EDITOR - Perfect your selfies with Impression filters - Add a beard or mustache - Change your hair color and hairstyle - Add volume to your hair - Try trendy full makeup filters - Creative light effects - Remove acne and blemishes - Smooth wrinkles - Easily enlarge or minimize facial features - Try out the color lens - Easy Compare tool at every step to compare before & after - Total control of temperature, saturation, and more - Discover your best hairstyle and color with our advanced tool READY TO SHARE? Share your FaceApp edits directly to your favorite social media accounts Just ONE tap and your photo is ready for a total social media blitz! - Terms of Use: https://www.faceapp.com/terms - Privacy Policy: https://www.faceapp.com/privacy - Online Tracking Opt-Out Guide: https://www.faceapp.com/online-tracking-opt-out-guide You are welcome to contact us at [email protected]
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
react-navigation
react-native-reanimated
BUILD KIT DIFFICULTY
Advanced
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.
