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
Rakuten: Cash Back & Deals
Stack Cash Back on top of coupons when you use the Rakuten app to get the best deal! It's 100% free for everyone - just join and start earning today!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
361,789 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/
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 Rakuten: Cash Back & Deals: map the core Shopping 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
Implement a more organized layout with better categorization and filtering options.
Assumption to check: Difficulty in finding specific deals due to UI clutter
Validate with people who use this workflow before building.
Hypothesis 2
Optimize image loading and API calls to improve performance.
Assumption to check: Slow loading times for deal content
Validate with people who use this workflow before building.
Hypothesis 3
Expand retailer partnerships to offer a wider range of cashback deals.
Assumption to check: Limited cashback options for certain retailers
Validate with people who use this workflow before building.
Hypothesis 4
Provide a responsive in-app support feature to address user queries quickly.
Assumption to check: Inconsistent customer service experience
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
Stack Cash Back on top of coupons when you use the Rakuten app to get the best deal! It's 100% free for everyone - just join and start earning today! Become one of the 17 million users who use Rakuten to get Cash Back Shop 3,500+ stores all in one app Here's how it works: 1. Join for free & choose a store to start shopping. 2. Earn Cash Back after you make a purchase. 3. Get paid via PayPal or check. ...and repeat! REFER FRIENDS & EARN: Share your referral link with friends and earn when they make a purchase! They will earn too, it's a win-win! Referral bonuses are unlimited, and it's free to share. AUTOMATICALLY APPLY COUPONS: Rakuten will find and apply coupons at checkout. EARN IN STORE & WITH DINING: Activate free Cash Back offers near you to find the best restaurant and store deals in your area. MY ACCOUNT: Get detailed status on what your Cash Back status is. Know when your next payment date is, and choose how you get paid - either by check, gift card, or PayPal. Stack Cash Back with sales, coupons, free shipping, loyalty programs, and more! There's unlimited Cash Back every time you shop in the app. We've paid our members over $3 billion to date. What are you waiting for? *Based on TrustPilot reviews as of 03/2026 Stay in the loop for the latest ways to earn & save with Rakuten: Website: www.rakuten.com Facebook: www.facebook.com/rakuten Instagram: www.instagram.com/rakuten Twitter: www.twitter.com/rakutenus Pinterest: www.pinterest.com/rakuten
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-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.
