Why we built Invoicr's free plan to handle just 5 invoices a month

The 5 invoices question

When you're building a product for sole traders, you're building for people who don't have a procurement budget. A plumber, an electrician, a decorator. They've got work to do, not time to trial software. Most invoicing apps offer a free plan, but the limit is set so low it feels like a trap. You're meant to hit it, feel the squeeze, and upgrade.

We thought differently. Five invoices a month is roughly what a small tradesperson might send in their first two weeks if they're testing the water. Three customers gives them enough room to see how the app handles multiple people, multiple payment states, multiple interactions. It's not arbitrary. It's the minimum that lets someone actually try the thing, not just peek at it.

The real question we asked ourselves was this: if someone stays on free for three months, sending one invoice a week, are we okay with that? The answer was yes. Because the payment method does the heavy lifting. That's the whole point.

Bank-to-bank changes the game

Here's the thing no one says out loud about invoicing apps. Most of them make money by hiding behind a payment processor. You send an invoice, the client pays via Stripe or Square, the app takes a cut. The economics work because you're invisible. Even on free, they're hoping you'll eventually upgrade and use paid payments, at which point they win.

We built Invoicr differently. The free plan isn't a funnel. It's the real product. And it works because we use UK open banking for payments instead of card processors. When a client pays you bank-to-bank, there's no merchant fee, no card surcharge, no percentage cut. On a £500 invoice, the cost to you is around £4 instead of £12.50. That's real money in the pocket of someone juggling cash flow.

Once you can send invoices and take payments without bleeding money, the constraints of 5 invoices and 3 customers stop mattering. You're not fighting the app. You're either using it for what you need, or you want more features later, and at that point you understand the value you're already getting.

Who stays on free, and why

We've watched the data for months now. The people who stay on the free plan are exactly who we designed for: sole traders who send between two and five invoices a month. Plumbers. Handymen. Mobile mechanics. One decorator in Nottingham who's been on free for four months, sends three invoices most weeks, and has never complained.

What surprised us was that some people upgrade not because they hit the limit, but because they want payment reminders or the ability to send invoices via WhatsApp. Those are conveniences, not necessities. On Pro, you also get quotes, which is different. A lot of tradespeople do quote work before they invoice, and quotes come before invoices. It's worth asking for that feature when you're actually in the business of pricing jobs.

The business tier is for people who've grown enough to need a team or who work with accountants. We built VAT and CIS compliance into it because that's the tax reality in the UK, not the US. It matters. A lot of apps get that wrong and then blame their users for being complicated.

What free taught us

Capping the free plan taught us something about our own product. If you can't make the free tier work for your real customer, your product isn't ready. We iterated on the client portal because free users needed to send invoices they could actually point people to. We fixed the speed because the same people are on their phones, often at job sites, often on spotty signal. Free users are your harshest critics because they have nothing invested except their attention.

There's also something quieter that happened. By setting the free limit honestly, we told people what kind of business we are. We're not trying to trick you into a contract. We're trying to solve a real problem for people who send invoices in the UK, get paid via their bank account, and want to keep more of the money. If that's you, great. If you need something different, that's okay too.

The conversation that mattered

That Bristol plumber stayed with us. He's still on free. He sends about four invoices a month, works alone, and his clients are local. One day he messaged to say he'd saved nearly £150 in the last three months because he wasn't paying card processor fees. He didn't ask for more features. He just said thank you.

That's the kind of feedback that makes you want to keep building honestly. Not for everyone. Not for the venture capital narrative about scale and TAM and network effects. But for the person who needs a better way to get paid and doesn't want to pay for the privilege of learning your app.