Inês is 38 and runs a small skincare clinic in Caldas da Rainha. Eight staff, four years in business, around €350k a year in revenue. Every month she opens her banking app and sees four direct debits for software:

Doodle, €8, appointment scheduling
Mailchimp, €20, monthly newsletter
Stamprr, €15, digital loyalty cards
Eventbrite, €12, sign-ups for the Saturday skincare workshops she just started

Fifty-five euros a month. Not a deal-breaker. But two weeks ago she tried to launch five-treatment QR packages that clients could show at the door, and none of the four tools support that. She asked three freelance developers for quotes. One replied. Two didn’t. The one who replied wanted €3000 for an isolated QR page that wouldn’t talk to anything else.

That’s when she landed on the Syntropic site, after a colleague told her “those folks build things to spec”.

Inês is this article’s stand-in. She isn’t a real client. The numbers are composites from conversations I’ve had over the past six months. If you recognise the shape of her problem, this is for you.

The 24-month math

I’ll be honest about the numbers, because most SaaS comparisons fail on intuition rather than arithmetic.

Scenario A, stay on SaaS. Four bills at €55 today, but the clinic is growing. In 12 months a fifth tool likely creeps in for package management (€15), and later a sixth for Multibanco or MB Way integration (€40). Over 24 months, the realistic total lands around €2000. And keeps climbing.

Scenario B, Syntropic. A single €49 monthly fee covering the bespoke app, direct support and ongoing evolution. No upfront build, no separate one-off invoices. Over 24 months, that’s €1176.

Scenario B comes in €824 cheaper than the SaaS sprawl, and the gap widens over time: as your business grows you’ll add more tools in Scenario A, while in Scenario B the bill stays the same. The inflection happens at the third subscription. Past that point, Syntropic is simpler and cheaper at the same time.

There are three variables the table doesn’t capture, and they reinforce the case.

The first is Inês’ time. Four logins, four support channels, four contracts. Even if she thinks she’s on top of it, there’s friction every single day. If a consolidated operation saves her one hour a week, that’s 50 hours a year. That time has measurable value.

The second is ownership. The code that leaves our office is hers. If Doodle doubles its prices tomorrow (it has happened), she has no real alternatives in the short term. If we double our monthly fee, she takes the code, hands it to another shop, and keeps going.

The third is the compounding effect. Each new SaaS is a new relationship, a new TOS, a new failure mode. At €15/month that’s €360 over 24 months for that tool alone, plus the time spent figuring out why the loyalty tool won’t talk to the booking tool.

But what if I don’t grow?

This section is here to save you money.

If your plan is to keep things exactly as they are, same tools and same headcount three years from now, Tessera or Doodle win. No way around it. €10 a month for 24 months is €240. Custom software is never going to beat that.

The client we lose for good reasons is the solo aesthetician working from home, doing five appointments a day, perfectly happy. We’ll talk to you with a smile, but at the end of the call I’ll point you to a €8 tool and wish you well. That’s the truth.

Custom software only pays off when your business needs more than a single isolated tool, or when the time you spend managing SaaS sprawl starts costing more than the monthly fee.

The argument no one gives you

When horizontal SaaS goes down, a thousand clients go down with it.

Platforms like Mailchimp, Calendly, Squarespace and Wix have had documented incidents in the past three years: multi-hour outages, data leaks, unilateral price changes. In each of those moments, thousands of small businesses across Europe were stuck waiting for a support team on the other side of the ocean to respond.

This isn’t theoretical. It happens, and your barbershop or your clinic is hostage. There’s no one to call who has skin in the game. Support replies in 48 hours, in English, and offers you a €20 voucher.

Dedicated software is different. If Inês’ app has a bug on Friday afternoon, she calls us. Not a chatbot. Not a ticket queue. Us. And we’ll fix it on Sunday if needed, because she’s one of ten clients on the books, not one of a hundred thousand accounts in a queue.

It isn’t technical superiority. It’s proximity.

AI changes the equation, but only on custom software

Do you really think your horizontal SaaS booking tool is going to ship a hairstyle analyser 18 months from now, the kind that tells the barber “this cut works on this client based on their face shape”? It won’t. Their business model is to serve 10,000 barbershops with the same feature, not to build features that matter to one vertical.

But if you have a dedicated app, you can add:

For a barbershop, photo analysis of hairstyles with a recommendation to the client before they walk in;
For an aesthetician, nail analysis and treatment suggestions based on skin condition;
For a physio clinic, initial triage by symptom description before the first appointment;
For a music school, real-time feedback on a student’s posture or rhythm.

These modules cost two to four thousand euros to build, once. Then they’re yours. The competitive edge is yours, not sitting in a marketplace waiting for your competitors to buy it for €9/month next week.

AI by vertical is what turns “a prettier app” into something that does what no one around you does. Without it, custom software is just expensive. With it, it becomes a differentiation tool.

What if Syntropic shuts down?

This is the objection Inês doesn’t say out loud, but thinks. And rightly so.

We’re a small team, three partners. If one of us falls off a ladder tomorrow, what happens to the clinic’s app? The answer comes in three layers.

Contractually, every client gets a source escrow clause. If Syntropic shuts down, the source code and full documentation go to the client within seven business days. No fee. No fine print. Another shop picks it up and keeps going.

Technically, we build on industry-standard stacks: Astro, React Native, Supabase, PostgreSQL. No proprietary languages, no obscure frameworks. Any competent developer in 2026 can read Inês’ code and continue from where we left off.

In human terms, continuity is our problem, not yours. If Syntropic grows, the first hire will be someone who inherits the maintenance of existing clients.

Decide for yourself

If four of these six apply to your business, it’s worth a conversation with us. Three or fewer, you should stay where you are:

You already pay two or more SaaS bills and the total is over €50/month;
You have three or more staff who touch at least one of those systems;
You tried to launch a new feature or product in the past 12 months and your current stack didn’t hold up;
Your business has recurring clients (not one-off sales), and the relationship with each client matters;
You see software as part of your competitive edge, not just a cost to minimise;
You bill above €150,000 a year and you expect to grow.

If you don’t hit at least four, keep spending the €10/month where you already do. You’re making the right call.

Conclusion

Custom software isn’t always the answer. For some operations it never will be, and you know better than I do whether you’re one of them.

What we offer is different from horizontal SaaS and different from a traditional agency. Software that’s only yours, evolved over time by a team you’ll know by name, with a clause that guarantees you the code if something goes wrong on our side.

If you want to test whether your business fits the six criteria above, the free digital diagnostic includes thirty minutes to do the 24-month math for your specific case. No obligation to keep working with us after.