Sendant vs Threema

Q: Is Threema still Swiss-owned?

In January 2026 Threema was acquired by the German private-equity firm Comitis Capital. Threema's servers remain in Switzerland, and its historic pitch was Swiss independence — how much the ownership change matters is yours to weigh.

Threema and Sendant agree on the big thing: private messaging shouldn't demand a phone number. They part ways on almost everything else — Threema is a paid, audited, Swiss-hosted family of native apps; Sendant is free, and it's the only identifier-free messenger with a persistent, full-featured no-install browser client.

Short answer: choose Threema if you want an audited, mature, paid messenger with native apps and Swiss hosting. Choose Sendant when you want zero cost, zero identifiers, and messaging that works on devices where nothing can be installed — including an iPhone, right now, in the browser.

Last updated July 6, 2026 — ownership history corrected (AFINUM 2020 → Comitis 2026). Living page — corrections welcome.

Side by side

Teal edge marks the stronger side of each row. No messenger wins every row, including ours.

Dimension	Sendant	Threema
Sign-up requirements	None — no phone number, no email, no account. Identity is a cryptographic key generated on your device; there's no ID string to manage or lose.	No phone number required: identity is a random 8-character Threema ID, and linking a phone or email is optional. Genuinely strong on this axis — but the ID is still a persistent, account-like identifier.
Price	Free. Funded by optional paid tiers — no ads, no token, no data monetization.	Paid — the mobile apps are a one-time purchase.
Browser / no-install use	Yes — persistent, full-featured client at app.sendant.io. Open a link, start messaging. This is how Sendant works on iPhone right now, in the browser.	No standalone browser client. Threema Web and the desktop app must be linked to the paid phone app.
Native apps	Android app. No native iOS app yet — iPhone users use the browser client.	Native iOS and Android apps, plus a desktop/web client that pairs with the phone app.
Independent audits	Not yet audited. An independent audit is planned; known limitations are documented rather than hidden.	Independently audited multiple times (including by Cure53). ETH Zurich researchers found protocol weaknesses in 2023, which Threema addressed with its newer Ibex protocol.
Encryption	X3DH + Double Ratchet — the same cryptographic primitives Signal uses — compiled to WASM so the browser runs the same crypto path as the native app.	Threema's own end-to-end protocol, strengthened with Ibex after the 2023 academic findings.
Metadata & hosting	The service never learns a phone number or email; servers see only ciphertext content. No independently verified metadata story yet.	Servers in Switzerland, a strong Swiss-privacy and GDPR posture, and a documented practice of minimizing stored metadata.
Bad-network behavior	Built for throttled, restricted, or intermittent networks: messages wait in an encrypted store-and-forward mailbox and deliver when your contact reconnects. Peer-to-peer and relay delivery paths are on the roadmap.	Centralized service; generally requires a working connection to Threema's servers.
Ownership	Independent, funded by its own optional paid tiers.	Long marketed on Swiss independence; acquired by the German private-equity firm Comitis Capital in January 2026 — a secondary buyout from AFINUM Management, the PE firm that had held Threema since 2020. Servers remain in Switzerland — weigh the change for yourself.
Maturity	Young product. Smaller feature surface and a much smaller user network.	A mature messenger refined over more than a decade, with an established user base.

Fact-check us: every row above is meant to survive scrutiny. If a row is wrong or goes stale, tell us and we'll correct it — this is a living page.

Choose Sendant if…

You want zero cost and zero identifiers

No purchase, no account, and no ID string at all — not even a random one. Your identity is a key your device holds; there's nothing to buy, register, or manage.

You can't install apps

Work laptop, library or school computer, or an iPhone where another app isn't happening. Sendant runs in the browser you already have — no linked phone required.

Your network is hostile

Throttled, restricted, or intermittent connectivity — messages wait as encrypted ciphertext in a store-and-forward mailbox and deliver when your contact reconnects. Peer-to-peer and relay delivery paths are on the roadmap.

Choose Threema if…

You want audited maturity

Threema has been independently audited multiple times, and when ETH Zurich researchers found protocol weaknesses in 2023, Threema shipped fixes in its newer Ibex protocol. Sendant hasn't been independently audited yet.

You want native apps, including iOS

Native iPhone and Android apps refined over a decade, plus a paired desktop/web client. Sendant's iPhone story is the browser, not the App Store.

Swiss hosting matters to you

Threema's servers are in Switzerland, with a strong GDPR and Swiss-privacy posture and a documented practice of minimizing stored metadata.

Common questions

Does Threema need a phone number?

No. Threema identifies you with a random 8-character Threema ID; linking a phone number or email is optional. That makes Threema one of the strongest mainstream options on the no-phone axis. The tradeoffs against Sendant: the Threema ID is still a persistent, account-like identifier, and the apps cost money — Sendant is free and has no ID string at all.

Is Threema still Swiss-owned?

Threema hasn't been independently owned for some time: private-equity firm AFINUM Management held it from 2020, and in January 2026 it passed to the German private-equity firm Comitis Capital in a secondary buyout. Threema's servers remain in Switzerland, and its historic pitch was Swiss independence — how much the ownership chain matters is yours to weigh.

Can I use Threema in a browser without the app?

No. Threema Web and the desktop app must be linked to the paid phone app; there is no standalone browser client. Sendant's browser client is standalone: open app.sendant.io and start messaging — no install, no linked phone.

Is Sendant audited like Threema?

No. Threema has been independently audited multiple times; Sendant has not yet been audited — an independent audit is planned, and known limitations are documented. Sendant is built on X3DH and the Double Ratchet, the same cryptographic primitives Signal uses (see Sendant vs Signal). If audited maturity is your top requirement, Threema is the safer pick today.

Try the difference in 30 seconds

No phone number, no email, no purchase, no install. Open the web app and see it for yourself — or read the full no-phone-number comparison.

Open web app Read FAQ