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
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PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.2
73,541 ratings · Top 30%
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 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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Testerup: Test & Earn Rewards: map the core Finance 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
Provide clearer task descriptions and guidelines.
Assumption to check: Users find it difficult to complete tasks due to unclear instructions.
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate higher-paying tasks or incentives.
Assumption to check: Low earnings for time spent on tasks.
Validate with people who use this workflow before building.
Hypothesis 3
Focus on optimizing app performance and conducting thorough testing.
Assumption to check: Inconsistent app performance and bugs.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce more diverse cash out methods to cater to user preferences.
Assumption to check: Limited payout options.
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
Earn money as an online tester? As often and whenever you want? Join Germany's largest platform for paid online jobs and join over 2,900,000 online testers. After signing up for free, you'll immediately have access to countless online surveys. - Earn over USD 850 directly after download, whether on the go or from the comfort of your home, maximum flexibility guaranteed. - Choose from the largest assortment in the German-speaking area, orders that fit you exactly. - You will be regularly invited to the latest surveys. - Orders with multi goals allow you to achieve higher earnings through continuous testing. - Fast and secure payout: Get paid within 24 hours. - Upgrade to a premium tester and earn exclusive access to higher-paying assignments. - Tested, Verified, Recommended! We value authenticity and trustworthiness. Not for nothing we are recommended by Verbraucherschutz.de. In addition, testerup.com is certified with the TÜV - eKomi rating of 4.3/5.
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.
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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.
