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
Eureka: Earn money for surveys
Eureka Surveys members have earned over $42 million to date, and a staggering 80% of new members earn $5 sent to their PayPal within the first day of downloading.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
575,213 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 included18 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 Eureka: Earn money for surveys: 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 gamification elements to make surveys more engaging and rewarding.
Assumption to check: Users often find survey completion tedious and time-consuming
Validate with people who use this workflow before building.
Hypothesis 2
Increase partnerships with survey providers to offer more surveys.
Assumption to check: Limited survey availability can frustrate users
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the rewards redemption process with clear instructions and feedback.
Assumption to check: Points redemption process can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Provide clear value for in-app purchases and consider offering a subscription model for premium features.
Assumption to check: In-app purchases can feel pushy
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
Eureka Surveys members have earned over $42 million to date, and a staggering 80% of new members earn $5 sent to their PayPal within the first day of downloading. Sign up for free, and we'll start you off with $1 for your first survey. Turn your opinions into earnings immediately and receive your rewards via PayPal, Amazon Gift Cards, or choose from over 70+ gift cards. Every survey you complete pays you cash. Also, don't miss out on free daily money just by taking part in our daily pay poll. We are the top rated money making app for a reason. Earn money with Eureka in THREE ways: 1. Surveys: get paid cash for sharing your honest opinion with researchers 2. Check Ins: instantly claim free money from your favorite brands with a single tap 3. Daily Poll: vote on today’s question to claim your free money Join the 4 million happy Eureka members and start making money today! With over 300,000 reviews, we are the most trusted money making app. If you earn with Swagbucks, Poll Pay, Attapoll, Survey Junkie, Surveys on the Go, Qmee, Zap, Fetch Rewards, Earnin, Ibotta, Mistplay, or Foap, give us a try! Please reach out to [email protected] for questions/inquiries. We pride ourselves on our quick response times - most inquiries are addressed and resolved within just one business day because we value your time. Happy earning! Looking to take surveys on desktop? Find us at eurekasurveys.com
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
Supabase
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React Navigation
React Query
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.
