What to Check When Invoice Simple Is Not Sending Invoices

If Invoice Simple won’t send an invoice, check three things in order. First, check whether your plan’s monthly invoice cap is used up: Essentials allows 3 per month and Plus 10, per the App Store listing captured 29 September 2026. Second, check whether the app is on the current build (iOS 6.15.1 on that date). Third, check that the client’s email address is spelled correctly. If all three pass, contact support@invoicesimple.com.

Did it fail to send, or did it just not arrive?

Work out which of two problems you have first. The fixes for each don’t overlap.

The app blocked the send

You tapped send and nothing went out, or the app stopped you before sending. Work through the next three sections in order, starting with your plan’s cap.

It sent but the client can’t find it

The invoice left the app, but your client says nothing arrived. Skip to the delivery checks further down. The problem is the address or the client’s inbox, not your plan or your build.

Check whether you’ve hit your plan’s invoice cap

Invoice Simple Essentials allows up to 3 invoices a month, per the App Store listing and the Google Play listing, both captured 29 September 2026.

The numbers per plan

When the count resets

Invoice Simple’s Essentials help article (dated 14 January 2025, retrieved 29 September 2026) describes the allowance as estimates and invoices created from the start of your billing month to its end. It doesn’t say whether estimates count against the cap, or what the app shows when you reach it.

✅ Do This: Count the invoices you’ve created since your billing month began. If you’re at the cap, the free option is waiting for the reset. For how each plan compares beyond the cap, see what each Invoice Simple plan allows.

Update the app, then try another send channel

The iOS app was on build 6.15.1 on 29 September 2026, per the App Store version history. That build was listed as released five days before our capture.

Which build is current

Every release note in that history says only “various bug fixes.” No build is documented as fixing sending, so update to rule out an old build, not because a fix has been announced.

On Android, the Google Play listing shows a last update of 21 September 2026 but displays no version number. We can’t name the current Android build.

Send by text, WhatsApp or PDF

Both store listings, captured 29 September 2026, say invoices can be sent by email, text or WhatsApp, or downloaded as a PDF. If email keeps failing, send by another channel today so you get paid while you troubleshoot. Invoice Simple also documents sending from its web app, and the differences are covered in the mobile app versus the web app. For the PDF route, see exporting invoices as PDF.

Confirm delivery with read receipts and a CC copy

Every plan includes real-time read receipts. The store listings, captured 29 September 2026, place them in Essentials, and Plus and Premium include everything in Essentials.

Check the invoice history

Invoice Simple’s Essentials help article says read receipts notify you when an invoice is delivered and when it’s read. It also says the Invoice History shows when each invoice was created and read.

1. If the invoice shows as delivered but not read, ask the client to check their spam or junk folder and to search their inbox for your business name.
2. If it doesn’t show as delivered, open the client’s details, check the email address letter by letter, correct it, and resend.

Turn on “send me a copy”

A Help Center article dated 6 April 2022 describes a mobile setting called “Send me a copy of emails.” With it on, each invoice you email also reaches you, with [CC] at the start of the subject line. That article predates the app’s current builds, and we couldn’t confirm where the setting sits today.

Check device support, then contact Invoice Simple

Invoice Simple publishes two different iOS minimums, both retrieved 29 September 2026.

The vendor’s two different OS minimums

Meet the stricter figure, iOS 16. The Help Center article pairs Android 7.0 with a release name that doesn’t match that version, so go by the number. The same article shows how to check your phone’s version.

How to reach support

If your plan isn’t capped, your build is current, your phone meets the minimum, and the address is right, stop troubleshooting here. The Help Center’s contact page, retrieved 29 September 2026, lists support@invoicesimple.com around the clock, plus in-app chat for real-time help. Include your plan name, app build, phone OS, the invoice number, and the client’s address.

How to avoid a blocked send next month

Most repeat failures come back to the first two checks.

Track your count against the cap

If you’re on a capped plan (see the table in the cap section), note the day your billing month starts and keep a running count. That way you won’t find out on the invoice that matters.

Keep CC copies on

A copy in your own inbox tells you instantly whether an invoice went out. That settles the “never got it” conversation.

🧾 Not Tested: We did not send invoices from a live Invoice Simple account for this article. The app’s behaviour at the monthly cap, its current menu layout, and any error text are therefore unverified here. Everything above is taken from Invoice Simple’s store listings and Help Center, captured 29 September 2026.

FAQ

The order that saves the most time

Work the checks in sequence: cap, build, phone OS, address. Hand over to support once all four pass. If the cap stops you more than once, the real question is whether the plan fits your volume, and what Invoice Simple actually costs to run weighs exactly that.