In January 2024, GS Vision's managing director Stefan Nikolov was invited to lecture students at the Faculty of Mathematics and Informatics of Veliko Tarnovo University "St. Cyril and St. Methodius". The topic — "SaaS vs self-hosted ecommerce solutions" — is a decision every online store owner faces sooner or later. This article expands on the arguments from that lecture into a practical guide for anyone approaching this choice.
How the two models work
SaaS (Software as a Service) platforms provide ecommerce infrastructure on a rental basis. You pay a monthly or annual fee and receive hosting, maintenance, updates, and technical support bundled together. The platform belongs to the vendor — you are simply a tenant.
With self-hosted solutions, you download and install the platform on your own or rented server. The code is yours or openly licensed — you control the hosting, the database, and every aspect of the system.
PrestaShop is a self-hosted, open-source platform distributed under the OSL 3.0 licence. Once installed, it does not transmit data to a central service and does not depend on ongoing subscription fees to the software vendor.
Costs: the visible and the hidden price
The appeal of the SaaS model is a predictable monthly bill. For a beginner with a small catalogue, this seems reasonable — you get started quickly without capital investment.
The problem emerges with growth. SaaS platforms typically charge based on transaction volume, product count, user accounts, or feature tier. As the store grows, costs accumulate from several directions simultaneously: the base subscription, payment processing fees as a percentage of turnover, add-on apps for features available elsewhere by default, and plan upgrades when limits are exceeded.
With a self-hosted solution like PrestaShop, the licence cost is zero. You invest in hosting, development, and maintenance — but those costs do not scale proportionally with your revenue. A store processing 10,000 orders per year and one processing 200,000 orders pay essentially the same for the platform itself.
Control over code and data
The question of control feels abstract at the start, but becomes very concrete as the business grows.
With SaaS, you have no access to the source code. You cannot change pricing logic, integrate a non-standard ERP system in a bespoke way, or optimise database queries. You work within the boundaries the platform permits — and when the vendor changes its terms or API, you adapt on their schedule.
With PrestaShop, the entire codebase is accessible and modifiable. The hook system allows extension without touching the core, meaning customisations survive upgrades. You can implement specific business logic that simply does not exist as a ready-made module on any platform.
Data ownership matters just as much. With a SaaS solution, your customer data, order history, and user behaviour live in a third party's infrastructure, under a foreign jurisdiction. With PrestaShop on your own server, you decide where data is stored, who has access to it, and how it is archived — questions directly relevant to GDPR compliance.
Scalability and its real limits
SaaS platforms advertise automatic scalability as a key advantage. When traffic spikes, their infrastructure handles it — theoretically without intervention on your part.
In practice, as a business grows seriously, the limitations of SaaS become more painful than the advantages. When you need a specific integration with an ERP, WMS, or complex delivery management logic, you discover the platform was not designed for your particular case — and you cannot change it.
Self-hosted solutions require your own infrastructure and technical capacity, but give you complete freedom in how you scale. PrestaShop handles multistore natively — managing multiple shops with different brands, countries, and currencies from a single back office, without additional licences. This is a capability that SaaS platforms typically charge significantly more for, or do not offer at all.
Vendor lock-in: the risk you only see on the way out
One of the most underestimated aspects of choosing an ecommerce platform is how difficult it will be to switch when the time comes.
With SaaS, your data is in their format, in their infrastructure. Migration to another system typically involves manual work, loss of history, or expensive conversion tools. URL structure, SEO history, and all integrations have to be rebuilt from scratch.
With PrestaShop you have full access to the database in standard MySQL format. The entire history of orders, customers, and the product catalogue is yours — in a readable, portable format that belongs to no one else.
When SaaS is the right choice
A fair comparison requires acknowledging that the SaaS model makes sense in certain situations. If you are launching a small store with a limited budget and want to test an idea quickly, if you have no technical team and do not plan to have one, or if you sell a narrow range of products with no specific business logic — low entry costs and fast time to market may outweigh the other considerations.
The problem is that many businesses start on a SaaS platform and stay there even after they have grown — not because it is the better fit, but because migration looks daunting. That inertia has a real cost.
When self-hosted is the only rational choice
As a business scales, a self-hosted solution like PrestaShop becomes not just cheaper, but functionally more capable. If you have specific pricing logic, promotional rules, or B2B/B2C separation that does not fit a standard template — the SaaS platform simply cannot give it to you. The same applies if you integrate with local payment systems, courier companies, or accounting software for which no ready connector exists, or if you manage multiple stores and brands from one place.
When GDPR and data sovereignty are a priority, the choice is even clearer: customer information should not live in infrastructure you do not control. And when your revenue reaches the point where a dedicated server costs less than escalating SaaS fees, moving to self-hosted becomes financially obvious as well.
TCO: the right way to compare costs
The lecture at Veliko Tarnovo University centred on the concept of TCO — Total Cost of Ownership. The platform decision is not simply a comparison of monthly prices, but a calculation over a 3–5 year horizon that includes licences and subscriptions, hosting and infrastructure, development and customisation, maintenance and updates, the cost of missed opportunities due to platform constraints, and potential future migration costs.
When TCO is calculated honestly and over a meaningful time horizon, self-hosted solutions for stores with real volume consistently come out more economical — and significantly more flexible.
The choice between SaaS and self-hosted ecommerce is a strategic decision with long-term consequences, not a technical detail to be deferred. The mistake many businesses make is choosing a platform based on today's needs without accounting for where they are headed. If you are building an online store with the intention of developing it, with a need for data control, and with a preference for costs tied to your actual value rather than your turnover — a self-hosted PrestaShop solution is the sensible choice. If you have questions about your specific situation, contact us.
Sources
- PrestaShop, official documentation: https://devdocs.prestashop-project.org
- Open Software License 3.0: https://opensource.org/licenses/OSL-3.0
- Veliko Tarnovo University "St. Cyril and St. Methodius", Faculty of Mathematics and Informatics: https://www.uni-vt.bg/
- Gartner, "Total Cost of Ownership" framework: https://www.gartner.com/en/information-technology/glossary/total-cost-of-ownership
Frequently asked questions
Can a small store launch directly on PrestaShop?
Yes. PrestaShop runs on shared hosting and can be launched with a starting budget comparable to SaaS alternatives. The difference is that you have full control from day one and do not face a migration later when the store grows.
How much does maintaining a self-hosted store cost?
Costs depend on the complexity of the store and the frequency of changes. For most stores with moderate traffic and a stable catalogue, monthly maintenance is predictable and remains significantly below the escalating fees of SaaS platforms at the same volume of work.
Is PrestaShop as secure as managed SaaS platforms?
Security depends on configuration and maintenance, not the platform alone. A well-maintained PrestaShop installation with up-to-date modules and regular updates is comparable in security to managed SaaS solutions. The additional advantage is that in the event of an incident, you have full access to logs and the system — something that is simply not possible with SaaS.