Invoice Koi Free generator

How to choose an offline invoice app

An offline invoice app is one that writes the whole document on the device, with no server in the loop. The useful test is not whether it opens without signal. It is whether you can finish the invoice, draw the PDF and keep the next number straight before reception returns.

3 min read
Make an invoice free

On Google Play now. Coming soon to iPhone. Have the app? Open it

An illustration of an hourglass, an alarm clock, a rubber band and a blank tag on a string, with a koi swimming among them.
01What offline means

Offline should mean the whole invoice

An offline invoice app should let you open the client, add the work, calculate the tax, draw the PDF and prepare it for sending without a connection. A cached home screen is not enough. The useful test is whether you can finish the document in aeroplane mode.

That matters because the weakest signal is often where the paperwork starts: a basement plant room, a rural property, the back of a warehouse, or the road between one job and the next. Waiting until reception returns moves the invoice from the job you just finished into the pile of things you intend to do tonight.

Invoice Koi keeps the businesses, clients, prices, documents and numbering on the phone. Totals are calculated there and the PDF is drawn there. You can finish the invoice at the site; sending it still needs whatever connection your mail or messaging app requires. AI, cloud backup and payment collection need an internet connection.

The honest offline test is simple: can you finish the PDF in aeroplane mode?

This is also why no account is required. A document that has to ask a server who you are before it opens is not an offline document, even if some of its fields were cached yesterday.

02A comparison checklist

Seven things to test before choosing

Turn off the connection before you test, not after. Then test the parts that usually reveal where an app stops being local.

TEST IT OFFLINE
Open an existing client
No loading screen
Create a new invoice
Including its number
Add tax and a discount
Totals still calculate
Use saved rates
The price book is local
Preview every page
Not a server image
Create the PDF
The decisive test
Reopen it tomorrow
The draft survived

Sending through email or a messaging service needs a connection. Making the file should not.

Also ask what happens to photographs. Invoice Koi stores receipt and job photographs on the device first. A subscription can carry those photographs to an account for backup, but losing the connection does not stop you opening the local copy or adding another one.

Card payment pages are different. A live payment needs a processor, so an app that promises payment processing cannot make that part offline. Koi can collect payments through Stripe while online. A payment made through a Koi payment link marks the invoice paid on its own. Cash, bank transfers and anything paid elsewhere, you record yourself. Recording one yourself carries no Koi fee.

03Test it without installing

Make the document before choosing the app

A feature list cannot tell you whether the finished invoice looks right. Make one, save the PDF, and read it at the size your customer will see.

The browser generator is the fastest test. It works on any device, asks for no account and puts no watermark on the page. It keeps the current draft in this browser when browser storage is available, but it is not a client directory or a backup. Save the finished PDF before clearing site data or moving to another device.

If the document is right and you make invoices regularly, the app adds the memory: clients, rates, the next invoice number, terms, tax and the estimate that becomes the bill. Setting up and drafting in it are free, so the workflow can be tested before you subscribe. Sending needs a subscription, with a free trial where your store offers one.

THE TWO WAYS IN

Both keep our name off your invoice. The browser forgets when you close it; the app remembers for next time.

While you are here

Test the document now.

The browser generator makes the same kind of PDF without an install, an account or a watermark. The app adds the clients, rates and numbering it should remember next time.

Make an invoice free

On Google Play now. Coming soon to iPhone. Have the app? Open it

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