App Overview

Invoice Maker Simple icon

Invoice Maker Simple

B TO J PTY LTD · Business

** NO SUBSCRIPTION REQUIRED **

$12.99 · In-app purchases

PRICE
$12.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.9
92 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/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

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.

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

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Invoice Maker Simple: 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

Competitive pricing with generous free tier

Assumption to check: Expensive subscription

Validate with people who use this workflow before building.

Hypothesis 2

Focus on most-requested features first

Assumption to check: Missing features

Validate with people who use this workflow before building.

Hypothesis 3

Optimize for 60fps, fast load times

Assumption to check: Poor performance

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

** NO SUBSCRIPTION REQUIRED ** Invoice Maker Simple is the easiest way to make and send professional invoices and estimates to your customers. Create invoices and estimates wherever you are - with a customer between jobs, or at home. Get paid faster. It’s perfect for small business owners, contractors, cleaners, freelancers, trades people, construction workers. Simple invoicing will save your precious time. Create, send and track invoices and estimates on your iPhone and iPad and keep your finances and accounting organised. You can simply add your customer’s info with purchased items. You can make simple but professional PDF invoices, quotes, estimates, purchase orders, receipts, timesheets instantly. That’s it. All will be done in minutes rather than hours. It’s so simple. It is also easy to track all invoices, estimates, quotes in one place. Professional looking templates are available for you to suit your business needs. Perfect for small business owners, contractors, cleaners, freelancers, trades people, construction workers. [ Key features of this simple invoice maker app ] • Manually edit titles, subtitles, and currency codes (e.g. Invoice -> Tax Invoice) • Payment term set up based on each customer • Turn quotes, estimates into invoices by a single tap • Check paid, overdue, unpaid invoices • Professionally designed beautiful templates (One simple template, 3 templates with header images) • CSV spreadsheet export to be used in your accounting software • Send PDFs via Email or SMS messenger • Save all PDF files in Apple Files app • Available on iPhone, iPad • Attach photos into invoices, quotes, estimates
• Use payment methods field to enter your payment details such as PayPal, credit card, bank transfer info • Tax, GST, VAT set up (e.g. No tax, single tax, compound tax) • Add discount (Actual $ or %) • Add payment terms (Immediate, 7 days, 14 days, 21 days,...up to 180 days) • Add signature and date on the spot • Simple, crisp, high resolution templates in PDF [ Invoicing and more ] You can also keep track of your business expenses and bills. Both income and expenses are visible in dashboard views in Reports page so that you can keep track of your cash flow. Reporting will be visible monthly, quarterly, yearly. This will benefit you to prepare your Tax and Accounting documents. You can even use this app as receipt tracker and bill tracking organiser because you can attach receipts. Invoice Maker Pro is the ultimate invoice maker. Send simple invoices using professional templates, invoice generator, PDF invoices and estimates, fast payments, bill organiser, receipt and expense tracker, and business cash flow reporting - all in one app. Please download our free invoice app today to see it yourself. You can start a free trial without singing in. All simple and easy. [ Upgrade to subscription version ] Subscription version offers cloud sync and back up feature so that you can save all the info in our highly secured cloud services and share the same data in multiple iOS devices such as iPhone and iPad. Upgrading to subscription version requires auto-renewal subscription. Payment will be charged to your Apple ID account at the confirmation of purchase. The subscription automatically renews unless it is canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your App Store account settings after purchase. Links to Your Privacy Policy and Terms of Use: http://invoicemkr.com/privacy.html http://invoicemkr.com/terms.html Please feel free to contact us if you have any questions. Try now! Simple invoicing will save your precious time.

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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
RevenueCat
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.