Zoho Invoice is the best free invoicing app for most freelancers: native iOS and Android apps, no invoice limit, and a published Verifactu declaration. renn Copilot is the better choice if you want Spanish VAT and withholding applied for you. SumUp suits you if you also take card payments on the spot. Everything else here either caps you hard or is not really free.
Invoicing from a phone is for one specific job: issuing the invoice on site, in front of the client, without going home to a laptop. That rules out half the tools sold as apps, because they are the website shrunk down.
Five criteria. Fail one and you will end up finishing the invoice on a laptop anyway.
It issues the whole invoice from the phone, not just shows you invoices made elsewhere.
It reads receipts with the camera. Half the value of having the app at all.
It works without signal and syncs later. The places where issuing on the spot matters most tend to be the worst for coverage.
Spanish VAT and withholding without setup on every invoice. Doing it by hand on a small screen is where the errors come from.
A published Verifactu responsible declaration. From 2027 this is the filter that decides, and a marketing claim is not the document.
What it does: issue and send invoices and estimates, scan expenses with the camera, track time and take payment online. Native apps for iOS and Android, plus Windows and smart watches.
Price: €0, with no invoice limit. The mobile app is included at no extra cost.
Verifactu: yes, with its responsible declaration published on its own site.
Pros
Cons
What it does: invoicing and expense capture for Spanish freelancers, with VAT and withholding applied to your case rather than configured by you.
Price: €0, with unlimited invoices and expenses. No cap on documents or clients.
Verifactu: yes.
Pros
Cons
What it does: invoice and take payment from a phone. It comes from the card reader business, so the mobile logic is native to it.
Price: free to activate.
Verifactu: it says it is compatible with Verifactu and TicketBAI depending on the territory, but does not publish its responsible declaration.
Pros
Cons
What it does: Spanish invoicing and accounting with a free tier that is real but small.
Price: Básico €0, capped at 12 documents a year, 10 clients and 5 products. Profesional €10.95 a month on annual billing.
Verifactu: yes, with a published responsible declaration.
Pros
Cons
What it does: invoicing and management for Spanish freelancers, with an automatic receipt reader in the app and tax forecasting.
Price: no free plan. Fifteen-day trial, then Starter €17, Solution €30, Premium €59 a month.
Verifactu: yes, with a declaration signed in July 2025, running exclusively in VERI*FACTU mode.
Pros
Cons
Included because it appears on every "free app" list and it has no free plan.
Price: 30-day trial with all features, no card. Then Básico €6.60 a month on annual billing or €8 monthly, Pro €14 or €17, Ilimitado €23 or €28.
Verifactu: yes, with declaration and compliance seal published. Unlimited Verifactu, Facturae and TicketBAI invoices on every plan.
Pros
Cons
What it does: open source invoicing with mobile apps, self-hosted or on their paid cloud.
Price: free if you host it yourself. Hosting is not free.
Verifactu: if you install it yourself, you generally become the one answerable for that system complying. The declaration is signed by whoever produces the software.
Pros
Cons
The Spanish tax agency published its own free invoicing application in October 2025, and it is a good option: unlimited invoices, free forever, compliance guaranteed.
But it runs in the tax agency's electronic office rather than as a phone app, it cannot issue simplified invoices because every invoice needs a named recipient, and you cannot export your records to carry on elsewhere.
For invoicing from a laptop it is a strong choice, and it is covered in free billing software. For invoicing in front of a client from your phone, it is not what you want.
The order is the same whichever app you pick.
Set up your own details once. Name, tax number, address, your usual VAT rate and your withholding if you are a professional. Ten minutes now saves errors on every invoice.
Save the client before you invoice them. Typing a tax number on a phone keypad is where mistakes happen.
Then issue. Clear description, taxable base, VAT, withholding if it applies, total. Check the number continues your series with no gaps.
The mandatory fields are listed in how to make an invoice.
The document count. Twelve a year sounds like a plan. It is one invoice a month. Check how many you issued last year.
The client count. Several tools cap clients rather than invoices. With many small jobs, that ceiling arrives first.
The trial dressed as a plan. Thirty days is not free software.
The time you spend configuring tax by hand. A free international tool gets expensive in minutes if your VAT changes by client.
The way out. Check you can export before you go in, not the day you want to leave.
1 January 2027 for companies and 1 July 2027 for the self-employed. Before then, voluntary.
From your date, every invoice must come from a certified system producing an unalterable record and a QR code.
There is no official list of approved software. Compliance works through the vendor's own responsible declaration, so "AEAT approved" on a website means nothing. Ask for the document. The timeline is in Verifactu entry into force.
If you want the most capable free app: Zoho Invoice, accepting that you configure VAT and withholding yourself.
If you want Spanish tax applied for you, free and uncapped: renn Copilot.
If you invoice and take card payment in the same moment: SumUp, after asking for its responsible declaration in writing.
If your activity is tiny and you want something Spanish: Contasimple, knowing it is 12 documents a year.
If you have outgrown free and want the best receipt capture: Quipu from €17.
What not to do: choose on the app store rating without checking the Verifactu declaration. In 2027 a tool without one stops being an option, and the problem lands on you, not on the vendor.
Zoho Invoice for features and no caps, renn Copilot if you want Spanish VAT and withholding handled automatically.
Yes. The rules say what an invoice must contain and, from your 2027 date, that it comes from a valid system. They say nothing about the device.
Some do. Zoho Invoice and Contasimple publish their responsible declaration. SumUp claims compliance but does not publish it.
It depends on the app. Some let you issue offline and sync afterwards. Check it before you commit if you work where coverage is poor.
Yes, but continue your numbering where you left off. Gaps in a series are among the first things checked in an inspection.
Almost never. Invoicing and keeping your books are different jobs, and free tiers cover the first. The second is in accounting software for the self-employed.
Related: Free billing software / Accounting software for the self-employed / Verifactu entry into force
