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DDoS Attacks on Threema

If you use Threema regularly, you may have noticed that the service was temporarily unavailable or only partially available on Tuesday evening and Wednesday morning. This was due to a series of DDoS attacks. Below, we explain what happened and outline the measures we’ve taken.

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Illustration of an overloaded server and malfunctioning connected devices.
Smartphone screen with two chat bubbles beside a browser window showing an email envelope and letter.
Threema Work

Email vs. Instant Messaging

Can you imagine working without email? You’re not the only one who can’t: for decades, email has been an integral part of corporate communication. Even though several other online communication services have emerged since the first email was sent in the 70s, many studies have shown that email still is the most used communication channel. So why should it be replaced or complemented with instant messaging?

Businessman in suit standing next to smartphone screen displaying open padlock icon with key and security shield.
Threema Work

Why C-Level Executives (Should) Use a Secure Business Messenger

Chat apps and their benefits of fast and easy communication have long arrived in companies. Many executives in C-level positions have come to appreciate the flexibility messengers offer: particularly in turbulent times, where one meeting comes after another, it’s practical to easily exchange important information via chat or quickly react to a message.

Three smartphone screens side by side showing chat app interfaces in light and dark themes with personalized backgrounds.
Threema Private

Individual Chat Wallpapers in Threema for iOS

Threema Private

World Press Freedom Day

In modern democracy, the press plays such an essential role that it is often described as the “Fourth Estate.” Without independent news coverage, and thus without the watchdog function of the press, political processes could not be reviewed by the public.

Threema Private

Threema for iOS Improves OS Integration

All good things come in threes: the latest Threema update for iOS introduces profile pictures in push notifications, contacts in the Share Sheet, and Siri suggestions, thereby improving the app’s OS integration quite a bit.

Two message cards: top with green WhatsApp icon and placeholder text, bottom with blue secure chat padlock icon and placeholder text.
Threema Work

Threema Work vs. WhatsApp: Not Every Messenger Is Suitable for Corporate Use

For many, WhatsApp has become the preferred messaging service in their everyday life. Even companies increasingly rely on the messenger for internal communication. However, using Meta’s chat app for business purposes can have serious risks for a company.

Threema Private

Open Letter to the British Government Regarding the Online Safety Bill

In addition to the EU’s so-called “chat control,” there’s another European draft legislation that uses child protection as a pretext for full-scale surveillance of chat communication without probable cause: the UK’s Online Safety Bill. Together with other messaging services, we take a firm stand against this legislative proposal.

Front view of smartphone displaying blueprint-style chat interface with text bubbles and audio waveforms.
Threema Private

Threema 5.0 for iOS: Fresh, Fast, Modern

Just like you occasionally replace old photos on the wall with new ones, apps also need a fresh touch every once in a while. Now, Threema’s iOS app presents itself in a new look: since the 4.8 update, the user interface has been renewed step by step. With Threema 5.0 for iOS, the complete rewrite of the chat view has now received its finishing stroke.

Illustration of a smartphone with four video call participants and a shield icon symbolizing secure connection.
Threema Work

Mobile Group Calls in the Business Context

If you need a fast response, a phone call is more efficient than a text message – this still holds true for the most part even though email, collaboration tools, and instant messengers have long become part of our communication habits. One-to-one and group calls, for example, allow you to discuss urgent matters quickly with one or several parties or update a project group on the latest developments while on the go.