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
HeyCash - Earn Free Cash Now
Welcome to HeyCash, your premier platform to earn money and receive instant cash rewards through surveys
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
64,652 ratings · Top 15%
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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
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Combine features and design from your favorite apps.
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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 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 HeyCash - Earn Free Cash Now: map the core Lifestyle 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 better filtering and sorting options in the Tasks screen.
Assumption to check: Users report difficulty in finding available tasks
Validate with people who use this workflow before building.
Hypothesis 2
Expand the rewards catalog and improve the redemption process.
Assumption to check: Limited rewards available
Validate with people who use this workflow before building.
Hypothesis 3
Enhance the paywall and provide clear explanations of premium features.
Assumption to check: In-app purchases not clearly communicated
Validate with people who use this workflow before building.
Hypothesis 4
Optimize backend queries and implement caching strategies for better performance.
Assumption to check: Slow loading times during high traffic
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
Welcome to HeyCash, your premier platform to earn money and receive instant cash rewards through surveys. With HeyCash, you can effortlessly complete surveys and engage with a variety of offers to boost your earnings, all from the convenience of your mobile device. HeyCash connects you to numerous earning opportunities, making it one of the top apps for easy and instant cash. Whether you're at home or on the move, start turning your opinions and activities into valuable rewards and earn money today. Features and Benefits: - Earn money efficiently by completing surveys quickly and securely, with rewards directly paid to your PayPal account or as gift cards. - Access a variety of surveys tailored to your interests, allowing you to earn money and receive instant cash rewards. - Consistent earning opportunities are available with new surveys daily, providing endless ways to earn money and receive instant cash. Our user-friendly interface makes it easy to complete surveys, ensuring you can earn money and receive instant cash without hassle, while we prioritize your security and privacy, keeping your survey responses confidential. You can track your earnings and access available surveys through our real-time dashboard, enjoy fast payouts with low thresholds, and benefit from HeyCash's accessibility on multiple devices, allowing you to earn money and receive instant cash rewards wherever you are. Disclaimer: Final results aren't guaranteed; the amount you can obtain is subject to app rules.
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
Supabase
React Navigation
TypeScript
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.
