Compare Inbox.eu and Tuta on capabilities, jurisdiction, assurance, and fit for European buyers.
Both listed as alternatives to: Gmail, Google Workspace, Microsoft 365
Latvia· Email Services
Needs review
Shortlist Inbox.eu when you need Latvia-hosted, ad-free SME email with large included storage, custom domains, IMAP clients, and business SSO under an EU operator. Skip when you require zero-knowledge E2E crypto or published ISO/SOC audits—consider Proton Mail, Tuta, Posteo, or mailbox.org instead.
Germany· Email Services
Needs review
Shortlist when you need default end-to-end encrypted mail, calendar, and contacts under German law with post-quantum TutaCrypt and official multi-platform apps. Skip when teams must keep Outlook/Thunderbird via IMAP or need a full M365/Workspace suite—consider Proton Mail (Bridge) or mailbox.org instead.
Highlighted rows differ between the two products.
| Feature | Tuta | |
|---|---|---|
| Country of origin | Latvia | Germany |
| Category | Email Services | Email Services |
| Open source | No | Yes |
| Self-hosted | No | No |
| Headquarters | Latvia | Germany |
| Legal entity | SIA INBOKSS (Inbokss Ltd), reg. no. 40003560720, Matrozu street 15-2, Riga, LV-1048 | Tutao GmbH (HRB 208014, Hanover) |
| Governing law | Republic of Latvia / EU GDPR | German law / GDPR |
| US parent / control | No known US parent | No known US parent |
| CLOUD Act exposure (indicative) | Medium | Low |
| Hosting / residency | Mailbox/file data: vendor claims own servers in Latvia (Riga DC, EN 50600-3) with live multi-copy backups and no EU exit. Web property privacy policy lists Google Analytics, Meta Pixel, Gemius, AdBox, InMobi CMP, and hCaptcha—US/global SaaS for analytics, ads, consent, and bot defence. No public full mail-path subprocessor register found. | Vendor states mailbox data is stored end-to-end encrypted on Tutao-operated servers in ISO 27001-certified data centers in Germany. No AWS/GCP/Azure primary hosting named on official security/privacy pages. Privacy statement discloses payment processing via PayPal (Europe) and banks for card/SEPA; no comprehensive public subprocessor list found for ops tools. |
| Summary | Latvia-based hosted email from SIA INBOKSS with ad-free personal and business mailboxes, custom domains, large integrated file storage, calendar/contacts, and mobile apps. | German end-to-end encrypted email, calendar, and contacts from Tutao GmbH in Hanover—with post-quantum TutaCrypt, open-source clients, and freemium personal plus business plans. |
| Tags |
| At a glance | Tuta | |
|---|---|---|
| HQ | Riga, Latvia (EU) | Hanover, Germany (Tutao GmbH) |
| Legal entity | SIA INBOKSS (reg. 40003560720) | Not listed |
| Product since | Inbokss 1998; Inbox.eu brand from 2011 | Not listed |
| Hosting | Vendor-claimed own servers in Latvia; multi-server backups | Own servers in ISO 27001 data centers in Germany (vendor claim) |
| Open source | No | Clients GPLv3 on GitHub; no productized self-host |
| Self-host | No | Not listed |
| Commercial model | Prepaid personal/business premium; time-limited trial | Freemium personal + paid personal/business (no ads) |
| Product | Not listed | Encrypted email, calendar, contacts (SaaS) |
| Protocols | Not listed | No IMAP/SMTP client access; official apps only |
| Crypto | Not listed | TutaCrypt hybrid (Kyber-1024 + X25519 + AES-256) for new accounts |
| Key capabilities | Tuta | |
|---|---|---|
| EU-operated (Latvia) | Yes | Yes |
| 100 GB mail + files | Yes | Not listed |
| Custom domains | Yes | Not listed |
| IMAP / SMTP | Yes | Not listed |
| SAML / LDAP SSO | Yes | Not listed |
| TLS, not ZK E2E | Yes | Not listed |
| Default mailbox E2EE | Not listed | Yes |
| TutaCrypt post-quantum | Not listed | Yes |
| Open-source clients | Not listed | Yes |
| DE data centers (claimed) | Not listed | Yes |
| No IMAP (by design) | Not listed | Yes |
100 GB mailbox plus integrated Files storage
Premium accounts include a large combined email-and-files quota (business adds domain-level shared storage). Files supports multi-gigabyte uploads, share links, parallel downloads, and WebDAV mounting on desktop—useful for SMEs that want drive-like sharing without a separate vendor.
Custom domains with business admin panel
Business email lets you host unlimited domain mailboxes after DNS/MX validation, with admin controls for users, aliases, catch-all, and domain settings. A public demo of the admin experience is available for evaluation before signup.
Standard protocols plus mobile apps
Full IMAP, POP3, and SMTP (with TLS) for Thunderbird, Outlook, and other clients; calendar and contacts sync; official apps on iOS and Android. Fits teams that refuse webmail lock-in.
TLS, 2FA, spam filtering, and business SSO
Transport encryption with TLS 1.2+, optional two-factor authentication, multi-filter spam/malware scanning, and Business SSO via SAML 2.0 or LDAP (including common IdPs such as Azure AD and Google Workspace). This is hosted-email security, not zero-knowledge E2E.
Migration support and human multilingual help
Documented IMAP/CSV migration paths from Gmail and other providers, plus real-person support in English and Baltic languages rather than chatbot-only queues—material for SMEs without a dedicated mail ops team.
Default E2EE for mail, subjects, and attachments
Between Tuta users, messages encrypt automatically including subject lines, bodies, and attachments. External recipients can use a shared password for end-to-end threads without installing software. Contacts and calendars use the same zero-access model; only delivery metadata (addresses, timestamps) stays readable by design.
TutaCrypt post-quantum hybrid cryptography
New accounts use TutaCrypt: Kyber-1024 KEM plus X25519 ECDH with AES-256, targeting harvest-now-decrypt-later risks. Protocol details are published; existing accounts migrate as key rotation rolls out. Tuta intentionally avoids PGP so subjects and non-mail features can stay encrypted and algorithms can be upgraded in-product.
Zero-knowledge calendar with private reminders
Calendar events—including times, titles, locations, and attendees—are end-to-end encrypted. Reminders are pushed as encrypted payloads and fired locally so servers are not told when an event starts. Sharing stays encrypted; invites can go out via mail, optionally password-protected for externals.
Open-source multi-platform clients (no IMAP)
Web, Android (Play and F-Droid), iOS, Windows, macOS, and Linux clients are published under GPLv3 on GitHub. Desktop builds are signed for verification. There is no IMAP/SMTP bridge: third-party mail apps cannot connect, which preserves encryption at rest but forces a client switch for Outlook/Thunderbird holdouts.
Business domains, admin console, and whitelabel
Paid business plans add custom domains, aliases, shared mailboxes, multi-admin roles, password/2FA resets, catch-all, templates, and optional branding/login on your own site. Vendor-stated uptime SLA and a GDPR order-processing agreement support B2B procurement—confirm current plan matrix on tuta.com.
| Assurance & compliance | Tuta | |
|---|---|---|
| Independent security / no-logs audit | Not found No public third-party audit PDF or no-logs attestation located on security/help pages. | Vendor claimed Vendor states SySS GmbH penetration testing before public release; not a continuously published annual no-logs audit PDF on the marketing site. |
| ISO 27001 | Not found No ISO 27001 certificate or registry entry found on official site. | Partial Official pages claim data centers are ISO 27001 certified; does not clearly establish a public Tutao GmbH organizational ISO 27001 certificate. |
| SOC 2 / SOC 3 | Not found No SOC 2/3 report referenced on official site. | Not found No SOC 2/3 report located on security, business, or privacy pages. |
| GDPR / EU data protection | Vendor claimed EU (Latvia) controller SIA INBOKSS; vendor states 100% GDPR compliance and Latvia hosting. Confirm DPA and subprocessors for your workload. | Vendor claimed German controller Tutao GmbH; privacy statement cites GDPR; DPO published; DE storage claimed. |
| US CLOUD Act exposure (indicative) | Partial EU entity / no known US parent; mail claimed on own Latvia servers. Residual medium exposure via US-group web SaaS in privacy policy (Google Analytics, Meta Pixel, hCaptcha, InMobi). Not legal advice. | Partial EU entity, no known US parent, primary mailbox hosting claimed as own DE servers—not AWS/GCP/Azure. Payment may use PayPal (Europe). Assessment is low exposure for content with residual billing/processor unknowns; not a vendor 'safe' claim. Not legal advice. |
| Data processing agreement (B2B) | Not found TOS mentions controller/processor roles under GDPR, but no standalone public DPA download found—request in writing. | Vendor claimed Security/business materials state an Order Processing Agreement (Auftragsverarbeitung) is provided for GDPR; obtain signed version via sales—no public self-serve DPA URL confirmed. |
| EU AI Act | Not applicable Conventional email hosting; not an AI-system product. | Not applicable Encrypted email/calendar product; vendor states it does not plan AI that processes user communications for model training. |
| Considerations & known limitations | Tuta | |
|---|---|---|
| No public ISO/SOC or independent audit | Medium Enterprise RFPs that require cert packs will stall until the vendor supplies private assurance materials. | Not listed |
| Not zero-knowledge E2E mail | Medium Operator-controlled storage with TLS in transit; legal-process access is acknowledged. Do not shortlist as a Proton/Tuta crypto peer. | Not listed |
| US-group tools on website privacy path | Medium Google Analytics, Meta Pixel, hCaptcha, and InMobi appear in the privacy policy even while mail is marketed as Latvia-only—align transfer assessments and cookies consent with this split. | Not listed |
| Public DPA / subprocessor list gap | Medium Processor language exists in TOS, but buyers still need a signed DPA and current subprocessors for regulated personal data. | Not listed |
| Operator also runs ad-supported portals | Low Inbokss group products include advertising-supported regional portals; verify contractually that paid Inbox.eu mailboxes stay ad-free and outside portal ad profiling. | Not listed |
| No IMAP/SMTP third-party clients | Not listed | High Desktop and mobile holdouts cannot stay on Outlook/Thunderbird/Apple Mail. Plan full client migration or pick a standards-based alternative. |
| Weaker protection to non-Tuta recipients | Not listed | Medium Without a shared password, external mail is ordinary SMTP (TLS in transit). Only Tuta-to-Tuta and password-protected external threads are true E2EE. |
| Hosted service, not on-prem mail | Not listed | Medium Open-source clients help inspectability, but mailboxes still depend on Tutao's German SaaS backend, uptime, and German legal process. |
| Data-center ISO vs company ISMS | Not listed | Low ISO 27001 wording refers to data centers. Do not tick 'vendor ISO 27001 certified' on questionnaires without the actual Tutao certificate. |
| Limited public subprocessor inventory | Not listed | Medium Privacy policy covers payments (e.g. PayPal Europe) but lacks a detailed live subprocessor register. Request the DPA annex for DPIA completeness. |
| German court orders on accessible data | Not listed | Low Transparency reports show regular German requests. Stored E2EE content stays undecryptable by Tutao; real-time monitoring can expose newly arriving unencrypted SMTP mail. Align expectations with counsel. |
When: You need open or heavily audited zero-knowledge end-to-end encrypted mail
Consider: Proton Mail or Tuta
Different crypto posture than TLS-hosted conventional mail
When: You prefer German jurisdiction and a long-standing privacy-host reputation
Consider: Posteo or mailbox.org
Often leaner storage; strong EU privacy positioning
When: You already depend on Docs/Drive/Meet or full Microsoft 365 collaboration
Consider: Google Workspace or Microsoft 365
Inbox.eu is not a suite replacement
When: You want Belgian dual-key / open-source-oriented secure mail
Consider: Mailfence
Different feature and crypto tradeoffs
When: Users must keep desktop IMAP clients or need Bridge-style Outlook integration
Consider: Proton Mail (Bridge on paid plans) or mailbox.org / Posteo / Soverin
Those options trade Tuta's automatic subject E2EE model for standards-based access
When: You need a broader German digital workplace (Drive, Office, video) with optional PGP
Consider: mailbox.org
Stronger suite breadth; different default encryption depth than Tuta's full zero-access mailbox
When: Swiss jurisdiction and multi-product privacy suite (VPN, drive, pass) matter more than German HQ
Consider: Proton Mail
Compare Bridge, ecosystem lock-in, and published cert posture side by side
When: Belgian OpenPGP-centric suite with browser crypto and classic protocols is preferred
Consider: Mailfence
Different encryption UX (PGP-oriented) versus Tuta's automatic proprietary stack