Simple Invoice App

Everything you need to invoice. Nothing you do not.

InvoiceSonic is a simple invoice app that keeps the everyday workflow short: choose a client, add the work, check the total and send. Small businesses can make the first invoice without signing up, then save clients, track invoices and automate reminders when they need a repeatable system. It runs as a mobile app on iPhone and iPad and in any browser on a mobile device or desktop, and it never takes a percentage of your payments.

First invoice without signup · iPhone, iPad and web · Professional PDF · No cut of your payments

Simple does not mean limited — Tax, discounts, deposits, recurring invoices and payment reminders are there when you need them. They stay out of the way when you do not.

Create your invoice here — free

Enter the actual job details, review the totals and preview your invoice. You can start without an account. Downloads follow the free-tool limits; saving, tracked sending and reminders are available with an account.

Create your invoice online

Your business
Bill to (client)
Invoice details
Line items
Description Qty Unit price Tax %
Totals
Payment details
Notes
Open interactive editor

What you get

Start without an account

Create and download the first invoice immediately in the builder. Decide whether to save it only after you have seen the finished PDF.

A clean invoice maker

Client, line items, tax, discount and payment terms sit in one clear flow instead of across an accounting dashboard. Small business owners get through it in a couple of minutes.

Automatic totals

Quantity, rate, tax, discounts and deposits calculate as you type, removing the errors that slow client approval.

Send professional invoices

Download the PDF or email it to the client with your logo, consistent branding and a clear amount due. Email notifications tell you when it has been opened.

Online payments, your way

Put bank transfer, PayID, Venmo, Zelle, Cash App or PayPal on the invoice so clients can pay online — by card through those platforms if they prefer — with no percentage taken by InvoiceSonic.

Remember repeat clients

Save client and line-item details so the next invoice takes seconds rather than another round of data entry.

Chase payment automatically

When you upgrade, InvoiceSonic tracks opens and sends scheduled reminders for invoices that go overdue — late payments stop depending on you remembering.

What it deliberately leaves out

No expense tracking, payroll or inventory. If you need those, pair InvoiceSonic with your accounting software; if you don't, you never have to see them.

How it works

  1. 1

    Add the client and work

    Enter who you are billing and describe each product, job, hour or fixed fee in plain language.

  2. 2

    Check tax, terms and payment details

    Choose the correct tax treatment, set a real due date and add the bank or payment rail you want the client to use.

  3. 3

    Download or send

    Create the PDF immediately, or save the invoice so you can email it, track it and follow up from the same app on any mobile device.

What "simple" should mean in practice

Plenty of invoicing apps call themselves simple. For small businesses the word only matters if it survives a real week of invoicing, so test it against three moments.

The first invoice
You should be able to finish and download it in under two minutes without creating an account, watching a tutorial or picking through settings.
The repeat invoice
The second invoice to the same client should start from saved details and take seconds. If you are re-typing an address, the app is a template, not a system.
The overdue invoice
When a client is late you should see it immediately and be able to send a reminder — or have one sent — without leaving the app.

Takeaway: InvoiceSonic is built to pass all three; that is the whole product decision behind it.

Create your first invoice now

No signup is required to build and download a professional PDF.

Create an invoice free

Frequently asked questions

What makes an invoicing app simple?

It focuses on creating, sending and tracking invoices without forcing a small business into payroll, inventory or full-ledger accounting. It should save repeat details, calculate totals correctly and make the amount and due date obvious to the client.

How is this different from Invoice Simple?

Invoice Simple is a well-known mobile invoice maker with a large template library, subscription pricing and a capped free tier. InvoiceSonic is built around the same idea — invoice in a few taps — but lets you create your first invoice with no signup, includes a genuinely free monthly plan, and never takes a percentage of your payments.

Can I create an invoice without signing up?

Yes. InvoiceSonic's free invoice generator lets you create and download your first professional invoice without an account. Signing up is useful when you want to save clients and invoices, email from the app, get notified on opens or schedule reminders.

Does the app calculate sales tax or GST?

Yes. Select the relevant country and tax treatment, then the invoice calculates tax from the rate you set. Australian invoices support GST and ABN fields; US invoices use sales-tax wording and USD.

Can I use it on my phone?

Yes. InvoiceSonic has a native iPhone and iPad app and also works in a mobile browser. The web version works on Android and can be added to the home screen.

When would I need accounting software instead?

Choose accounting software when you need a full ledger, expense tracking, payroll, inventory, bank reconciliation or a bookkeeper working inside the system. If your problem is creating invoices and getting them paid, a focused invoicing app is usually faster and less expensive.