Odoo vs. Aderis vs. Rillet: Swiss and EU finance requirements built into the core, not added as a country package

What is the difference between localisation and a finance platform built at the core?

Localisation means that finance software is built for one market and later adapted to other countries through country packages, partner modules and integrations. Built at the core means that multiple entities, local tax rules, bank connectivity and data hosting are part of the platform architecture from the outset.

For a business with one entity in one country, localisation works well. It becomes demanding once a group operates entities in several countries, for example in Switzerland, Germany and Austria. Several country packages, tax regimes and bank connections then have to work together at the same time.

A group with entities in Switzerland and the EU therefore needs several requirements met on one platform rather than in separate solutions:

1. Multiple entities and ledgers at once. The same transaction has to reconcile across the statutory accounts under the Swiss Code of Obligations (OR) or the German Commercial Code (HGB), management reporting and the group view.
2. Local taxes and retention requirements. Swiss VAT (MWST), German and Austrian VAT, and the retention requirements under the Swiss Ordinance on the Keeping of Business Records (GeBüV), the German GoBD and the Austrian Federal Fiscal Code (BAO).
3. Local payments. Direct connectivity to Swiss and European banks through the ISO 20022 standard, including the Swiss QR-bill, to name one further concrete example.
4. Data hosting in Switzerland and the EU. A clear answer to the question of which country the financial data and backups are stored in, and which law the provider itself is subject to.

Where is financial data stored with Aderis, Odoo and Rillet?

In many conversations with CFOs in Switzerland and the EU, this is the first question. Rightly so. The accounting records contain customers, suppliers, salaries, terms and bank details: a complete economic picture of the business. Since September 2023, the revised Swiss Federal Act on Data Protection (FADP) has required businesses to know and disclose which countries personal data flows to. In the EU, the GDPR applies.

The three providers answer the question very differently:

• Odoo runs on Google Cloud with seven locations, the nearest in Belgium, according to the Odoo hosting provider. None of them is in Switzerland. Odoo's privacy policy does not list an Odoo-operated hosting location in Switzerland either.
• Rillet is a US company and names AWS as its hosting provider, without a region or country. On data protection, Rillet refers to a voluntary commitment to the GDPR (“GDPR committed”), with no information on where data is stored. The Swiss data protection act is not mentioned.
• Aderis: hosting and data storage in Switzerland and the EU. Aderis is a Swiss company. All sub-processors are listed, with their location and the purpose of processing.

When selecting a system, four simple questions are worth asking every provider:

1. Which country are our data and backups stored in?
2. Which law is the provider itself subject to?
3. Who has access in a support case, and from where?
4. How long and where are documents retained in line with GeBüV and GoBD?

A CFO's view

Where does Odoo reach its limits in Switzerland and the EU?

Odoo is a product for SMEs that want CRM, inventory, webshop and accounting from a single source. According to its own documentation, Odoo supports more than a hundred countries. That is where the limit lies: Switzerland is one of a hundred country packages. For a group with multiple entities, this shows up in concrete ways:

• No statutory consolidation as standard. The standalone consolidation app was removed in version 18. Odoo partner Syscoon notes that what remains is sufficient for a management view but not for statutory consolidation. The independent portal ERP Scorecard currently rates multi-entity and consolidation at only 2 out of 5.
• Each entity is posted separately. Reports can be viewed across several entities, but postings are made in one entity at a time, each with its own chart of accounts.
• Data hosting: Odoo currently offers no hosting location in Switzerland.
• An upgrade every year. Odoo supports only the three most recent major versions. Customisations have to be reviewed again with every version upgrade. One Odoo partner writes that total cost is usually three to five times the licence fee.

Where does Rillet reach its limits in Switzerland and the EU?

Rillet has understood something important: AI agents belong in the general ledger, not alongside it. Since November 2026, the company has been building a European business from London. Anyone assessing Rillet from the perspective of a European group, however, finds a product built consistently for the US market:

• US standards as the foundation for financial reporting and tax. Revenue recognition under ASC 606, controls under SOX, tax through US providers such as Avalara. According to research firm Sacra, native VAT exists for the United Kingdom, Australia and Canada. Not for Switzerland, Germany, Austria or other EU countries.
• Consolidation across several countries: The portal ERP Scorecard explicitly cites “significant statutory complexity across multiple countries” for Rillet customers.
• Bank connectivity: Documented connections include US banks such as J.P. Morgan, Chase and Mercury, as well as Plaid EU. Swiss banks and ISO 20022 are not mentioned.
• Data hosting: AWS, with no region or country specified.
• Operational functions and language: According to ERP Scorecard, Rillet covers neither inventory nor production nor order processing. According to G2, the interface is available in English only.

What sets Aderis apart from Odoo and Rillet?

Aderis is the Live Finance Platform, built in and for Switzerland and Europe. Consolidation, Swiss VAT, bank connectivity and data hosting in Switzerland are part of the platform's core, not part of a country package.

• Consolidation: one entry, every view. Every entry is recorded simultaneously in the statutory accounts, the tax view, management reporting and the group view. The reconciliation to group level happens without Excel. A new entity, in Austria for example, is a configuration, not a project.
• Tax: Swiss VAT, including the VAT return, is built in natively. Every entry is assigned for tax purposes on an ongoing basis, so the VAT liability is known at all times. If a VAT audit comes years later, every figure is linked to its supporting document, decision and approval.
• Direct bank connectivity: Through SIX bLink and the ESPRIT Network, account transactions flow into the platform continuously and payments go directly to the bank. ISO 20022 and the QR-bill are supported natively.
• Data hosting: the data stays in Switzerland and the EU. Aderis is a Swiss company, and hosting and data storage are in Switzerland and the EU. The question of where the financial data is stored has a clear answer. All sub-processors are publicly listed, with their location and the purpose of processing.
• Operational functions: Alongside financial accounting, Aderis covers sales orders, delivery notes and purchase orders for trading and manufacturing businesses operating across several countries.

Which finance platform suits businesses in Switzerland and Europe?

Odoo is an all-in-one suite that appeals to SMEs looking to bring sales, inventory, e-commerce and accounting together in a single platform. It offers localisations for countries such as Kenya, India and Mexico, with Switzerland simply one among many. However, Odoo does not offer a hosting location in Switzerland.

Rillet is built for the US market and stands out for software and AI companies with subscription revenue. Rillet has only been present in Europe since November 2026, and specific localisation requirements for Switzerland and the EU have not yet been publicly documented.

Aderis is an AI-native finance platform that understands Swiss and European requirements at its core. It suits growing groups with multiple entities, currencies and tax regimes for which data hosting in Switzerland or the EU is a prerequisite.

The finance platforms of the coming years will not be measured by how many countries they are available in. Their quality shows in how deeply they understand the requirements of the countries in which a business operates. Tax rules, bank connections, accounting and data hosting have to work together at the core. Every gap in the platform means additional work for the finance team.