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How to choose an invoice app in the UK as a sole trader

Five questions to ask before you pick an invoice app, written for people who work with their hands.

21 September 2026
By Kamal Leadbitter, Founder

The short answer

Pick the app that matches where you are when you remember the job. If that's at a desk, an accounting app is fine. If it's in a van, a yard or a client's driveway, pick one you can use by voice in under a minute.

Five questions to ask

  1. 1How many invoices do I send a month? Check the plan limits, not just the price.
  2. 2Can I create one without typing? Voice saves the most time on site.
  3. 3Will it chase late payers for me? Automatic reminders are where the money is.
  4. 4Can customers pay by card from the invoice? Faster payment, fewer excuses.
  5. 5Do I need accounts in the same app? If yes, look at Xero, QuickBooks or FreeAgent.

Invoice app vs accounting app

An accounting app does bank feeds and tax. An invoice app gets invoices out and paid. Plenty of sole traders use one of each.

Compare them side by side

Or see the industry pages for equestrian, mobile mechanics and dog walkers.

Frequently asked questions

What is the best invoice app in the UK?

There isn't one best app for everyone. For accounting, Xero or QuickBooks. For fast invoices on your phone by voice, SaidToPaid.

Is there an invoice app I can try without a card?

Yes. SaidToPaid lets you create and send 5 real documents free with no card.

Can an invoice app chase late payments?

Many can. SaidToPaid sends automatic payment reminders on the Pro plan.

Turn your next job into an invoice draft.

Try 5 documents free