1. The difference isn't in the interface
Wix and Squarespace have good visual editors — in some ways more intuitive than WordPress for non-technical users. But the real difference is structural: with Wix and Squarespace, the site lives on third-party infrastructure, under third-party rules, with a feature catalogue that the platform updates on its own schedule. With self-hosted WordPress, the site belongs to the client: it can be moved, modified at code level, integrated with any system.
This isn't a matter of technical pride. It's the shape of the problem. As long as the client's needs fit within the platform's catalogue, everything works. The moment they step outside it, the agency has to manage a situation that wasn't in the original scope.
2. Integrations with external systems
HubSpot, Salesforce, custom booking systems, webhooks to internal CRMs: on WordPress almost anything integrates via official plugins or custom code. On Wix and Squarespace it depends entirely on what the platform chooses to support in its marketplace.
Wix has a growing app market, but the available integrations aren't equivalent to a bespoke WordPress plugin. Squarespace is even more restrictive. For an agency delivering a site and then adding integrations on client request, this constraint becomes a concrete problem sooner than expected.
3. The moment the client comes back
A recurring scenario: site delivered on Wix because the client wanted something simple and the budget was tight. Six or twelve months later, the client wants to add a section with advanced filters, a members-only area, or a feed from an external API. On WordPress you build it. On Wix or Squarespace you check whether the feature exists in the catalogue.
If it doesn't, you explain the platform's limits. Or you propose a migration, at a cost that wasn't in the original estimate. That cost lands on the agency-client relationship, not on the platform that created it.
4. Getting out of Wix or Squarespace
Migrating away from WordPress: export the data, transfer the database, rebuild the theme on a new stack. Laborious but doable with a clear process. Migrating away from Wix or Squarespace: the content export is partial, templates don't transfer, the visual structure must be rebuilt from scratch.
It's not impossible, but almost all the structural work already done is lost. For an agency that invested hours in the build, this means every project on these platforms carries a future migration risk that never appears in the initial estimate.
5. Costs over three years, not one month
Wix and Squarespace look affordable upfront: business plans from €15 to €30 per month. Self-hosted WordPress requires hosting (€5 to €40 per month depending on traffic) plus optional premium plugins. At first glance Wix and Squarespace match or win on price.
The comparison shifts over a three-year horizon. A Squarespace Business plan at €23/month costs around €830 in subscription fees alone — and the site still isn't yours. On WordPress over the same period you spend less on hosting, retain full ownership of the data, and can move the entire site to a different provider whenever you need.
6. When Wix or Squarespace make sense
Not every project needs WordPress. A brochure site for a professional practice — three pages, no integrations? Squarespace works, and the client can manage it without any technical help. A microsite for a time-limited event? Wix is faster to build for someone without technical experience who needs no ongoing support.
The problem isn't the platform itself — it's using it on projects that start small but have growth potential. The initial saving gets paid back in the form of constraints that appear as soon as the client wants more.
Verdict
For agencies working with structured business clients, WordPress is almost always the right choice. Not because Wix or Squarespace are bad tools, but because WordPress's technical freedom and portability eliminate an entire category of future problems.
Wix and Squarespace remain a sensible answer for clients with simple needs, limited budgets, and no plans for technical growth. If even one of those three conditions doesn't hold, building on WordPress from the start is the better call.
Next step
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