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
Invoice Maker・Billing App
Over 5,500 users rated 5* for helping them create and share invoices in just a few seconds, on the go, from any device.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
7,248 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 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 Invoice Maker・Billing App: map the core Business 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 more customizable templates and features.
Assumption to check: Users often find invoice customization limited.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a clearer and more user-friendly subscription management system.
Assumption to check: Some users report issues with the subscription management.
Validate with people who use this workflow before building.
Hypothesis 3
Add detailed onboarding and instructional content.
Assumption to check: Invoicing can be confusing for new users.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce in-app support chat or enhanced help resources.
Assumption to check: Limited customer support 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
Over 5,500 users rated 5* for helping them create and share invoices in just a few seconds, on the go, from any device. Your time is too precious to spend on mundane paperwork. Let us handle that while you focus on what’s really important. FIVE REASONS TO GET STARTED NOW: 1. SAVE TIME Creating a professional invoice or estimate takes you just a few seconds and a couple of taps, as you save all details of your product or service —description, price and more. Convert estimates to invoices with one tap. 2. STAY ORGANIZED Never put off sending an invoice or estimate to your customer - you can easily create and share it before you leave the sight. Enter all the details you need, including tax or discounts - the app will do the math for you. Check simple and convenient reports in one glance to follow up on clients’ payments. 3. GET PAID FASTER Make it easy to get paid. Include your preferred payment methods description directly in your invoice - PayPal, bank account or cash - and enjoy getting paid in time. 4. LOOK PROFESSIONAL Impress your clients with crisp design and customized branding of your documents. Add signature, photos and notes to your invoices and quotes. INFO ABOUT USING THE APP AND REGARDING THE SUBSCRIPTION TERMS OF USE AND SUBSCRIPTION DETAILS You can create 1 free document, either invoice or estimate. After that, you can subscribe to the in-app to continue creating an unlimited number of invoices and estimates with a monthly subscription. You can cancel your subscription at any moment in your iTunes account settings, but refunds will not be provided for any unused portion of the terms. Payment will be charged to your iTunes Account at purchase confirmation. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. ------------ For support, email us [email protected] Terms of use: https://saldoapps.com/saldo-apps-terms-of-use Privacy policy: https://saldoapps.com/saldo-apps-privacy-policy by S/A Saldo Apps
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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
Zustand
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.
