Where your data lives
All data stays in the European Union, with the European provider OVHcloud. It never leaves the EU and the whole operation complies with GDPR. The system and support are in Czech and Slovak, and behind it stands a company with a full legal identity.
Availability and backups
Runs in multiple data centres at once
MEFYS runs simultaneously across several data centres in different EU countries. If one goes down, another takes over — you won’t notice a thing and keep working.
Hourly backups
We take full backups every hour. Even if something went wrong, we roll back at most a small step.
A backup copy of your data within minutes
On top of that, your data is continuously copied to a second data centre — the backup copy is refreshed within minutes. The risk of data loss is minimal.
Traffic protection via Cloudflare
Incoming traffic passes through Cloudflare — encrypted connection and protection against overload and attacks from the internet.
Encryption and access
- Encrypted transport (HTTPS/TLS) — communication between you and MEFYS is always encrypted.
- Passwords are never stored in readable form — we store them in a way that makes it impossible to read the password back.
- Two-factor login (2FA) — protect your account with a second factor. And no more typing codes: just use your fingerprint or face — Touch ID and Face ID on iPhone and Mac, Windows Hello on your PC, fingerprint on Android (a so-called passkey). The authenticator code always remains as a backup.
- Each company's data is kept separate so no other company has any way to get to it — the database itself enforces this (separation at the database level).
- Roles and permissions — you decide who sees invoices, who sees inventory and who sees settings.
Connecting an AI assistant
You can connect MEFYS to an AI assistant, such as Claude (technically over the MCP standard). The connection only exists through a key you create yourself and can revoke at any time — and you decide what the assistant may do (we recommend read-only). The assistant sees only what you allow, for financial documents it can at most prepare a draft for approval, and nothing can be deleted through it. Your data stays in your MEFYS in the EU. Note: if you connect a third-party assistant, the data you request is also processed by its provider — the choice of assistant is in your hands. Details on the AI control page.
AI transcription of photographed documents
When you let MEFYS type up a photographed document (so-called data extraction), the content of the uploaded document (typically a received invoice or receipt) is passed to the AI service provider Anthropic, PBC as our processor — solely so it can read the details off the document. The data is not used to train AI models and any transfer outside the EU is contractually covered under EU rules (EU standard contractual clauses). The output is always only a draft document that you review and approve — nothing is booked automatically. The feature runs only when you upload a document yourself. See the Privacy Policy for details.
No lock-in — the data is yours
You can leave MEFYS anytime together with your data. Download your invoices and documents as PDFs, spreadsheets (CSV/XLSX) and in a format accounting software reads (ISDOC). We don't tie you in by making it hard to leave.
Who operates MEFYS
MEFYS is developed and operated by ROOT4U s.r.o., a company with a verifiable identity — company ID, registered office, commercial-register entry and contacts are on the Contact page. No anonymous overseas operator.
Security FAQ
Where is my data stored?
In the European Union, with the provider OVHcloud. Data never leaves the EU and the operation complies with GDPR.
What happens if a server goes down?
MEFYS runs in several data centres in different EU countries at once. If one goes down, another takes over and the system keeps running.
How often do you back up?
We take full backups every hour. On top of that, your data is continuously copied to a second data centre — the backup copy is refreshed within minutes. The risk of data loss is minimal.
Can other companies see my data?
No. Each company's data is kept separate so no other company has any way to get to it. Only the people you invite have access — and each of them sees only what you allow.
Can I sign in with my fingerprint or face?
Yes. Add your device in your profile and confirm each sign-in with your fingerprint or face — Touch ID, Face ID, Windows Hello or fingerprint on Android. It is safer than typing codes, and the authenticator code remains as a backup. Once a device is added, you can also sign in entirely without a password — just choose “Sign in with fingerprint” on the login page.
Can I take my data with me?
Yes, anytime. You can download your invoices and documents as PDFs, spreadsheets, or in a format accounting software reads. No lock-in — you leave MEFYS together with your data.
Try MEFYS on your own data
14 days free on a Free account, no payment card. Data stays in the EU, you can leave anytime.
Issue your first invoice for free →Details about hosting, backups and availability reflect the state as of 30 June 2026 and may evolve over time. Specific contractual terms are governed by the Terms of Service and the Privacy Policy.