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
Yuka - Food & Cosmetic Scanner
◆ 85 MILLION USERS ◆
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
101,882 ratings · Top 5%
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 included17 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 Yuka - Food & Cosmetic Scanner: map the core Health & Fitness workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
◆ 85 MILLION USERS ◆ Yuka is a free mobile app that allows you to scan the barcodes of food and personal care products and instantly see their impact on your health. A rating and detailed information help you understand the analysis of each product. When a product has a negative impact on your health, Yuka also recommends similar but healthier alternative products. ◆ A 100% INDEPENDENT PROJECT ◆ Yuka is a 100% independent project : product reviews and recommendations of healthier alternatives are done in an objective way. No brand or manufacturer can influence them in one way or another. Furthermore, there is no in-app advertising. You can access detailed information on our business model on our website (www.yuka.io). ◆ 6 MILLION REFERENCED PRODUCTS ◆ Yuka established a database that contains 4 million food products and 2 million cosmetic products. Each food product is evaluated according to 3 objective criteria: nutritional quality, presence of additives and organic aspect of the product. The method to analyse cosmetic products is based on the analysis of all the ingredients of the product. Each ingredient is assigned a risk level according to the latest scientific data. --- Terms of use: https://yuka-app.helpdocs.io/l/en/article/2a12869y56
Written user reviews are not shown here. Check current App Store reviews >
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
Implement user-generated content for product submissions.
Assumption to check: Limited product database leading to incomplete information
Validate with people who use this workflow before building.
Hypothesis 2
Introduce manual search and user ratings for better results.
Assumption to check: Scanning accuracy can vary based on lighting conditions
Validate with people who use this workflow before building.
Hypothesis 3
Simplify subscription tiers and provide clear benefits.
Assumption to check: Subscription model can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Add social features for sharing reviews and product experiences.
Assumption to check: Lack of community features for user engagement
Validate with people who use this workflow before building.
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-navigation
expo-camera
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.
