Threema (Android)

Getestete Version: 5.1 Build 3000906

Threema is a messenger service with high privacy standards. The service can be used completely anonymously. In addition to sending messages, end-to-end encrypted voice and video calls are also possible.

Overall assessment of the app Threema (Android)

Overall assessment: Conditional accessibility.

Full name: Threema (Android)
Publisher: Threema GmbH
Publisher country: CH
Informationen about the app
Tested version: 5.1 Build 3000906
Operating system: Android
Overall assessment normalised: 0.76
– Share of accessibility profile: 0.44 (50% out of 0.89)
– Share of feasibility grade: 0.31 (50% out of 0.62)
Valuation information
The assessments and ratings relate exclusively to the version 5.1 Build 3000906 of the app tested by us in the period from June to August 2023.

Accessibility profile

Tabelle Aspekte des Accessibility-Profil

Aspect Rating
Mobile operability 5 out of 5 points
Keyboard operability 2.5 out of 5 points
Voice control 5 out of 5 points
Compatibility with user agents 4.5 out of 5 points
Assistance with interactions 4.5 out of 5 points
Consistency/predictability 5 out of 5 points
Semantic structure 4.5 out of 5 points
Comprehensibility 5 out of 5 points
Display flexibility 4 out of 5 points
Contrast and sensory characteristics 4.5 out of 5 points
Non-text content graphics 5 out of 5 points
Multimedia alternatives No rating
Average value 4.5 out of 5 points
The maximum achievable score is 5 points.

On a normalised scale, the score of the accessibility profile corresponds to 0.89 points. This value is weighted at 50% in the overall assessment.

  • Mobile operability: Usability and full display of content in portrait and landscape format; pointing actions and operability by device movement possible with conventional input methods.
  • Keyboard operability: Interactive elements can only be operated with a keyboard and are highlighted when focused on.
  • Voice control: Controls have an accessible label that corresponds exactly to the visual description/name.
  • Compatibility with user agents: User agents and assistive technologies are informed about changes in the state of the user interface as well as status messages.
  • Assistance with interactions: Interaction with forms; pointer entries can be cancelled or undone.
  • Consistency/predictability: Consistent navigation; context remains when focused in or during input.
  • Semantic structure: Content is labelled with structural elements such as headings, lists and labels that reflect the context of meaning.
  • Comprehensibility: Headings, form labels and link texts are understandable, correct language declaration is used.
  • Display flexibility: The presentation of the content can be adapted to the needs of the users: text size, control over animated elements and media.
  • Contrast and sensory characteristics: Adequate contrasts, no expressions such as ‘in the picture on the right’ or ‘click the red button’; information is not conveyed solely by colour.
  • Non-text content (graphics): Informative graphic elements have useful alternative texts.
  • Multimedia alternatives Multimedia content is compatible with at least one alternative sensory channel.
Value range Meaning
4.5 to 5 points Good accessibility
4 points Conditional accessibility
3 to 3.5 points Insufficient accessibility
0 to 2.5 points Poor accessibility

Diagramm Aspekte Accessibility-Profil

Presentation of accessibility by type of limitation

Type of restriction Degree of compliance
Motor skills 71%
Sight 86%
Hearing 100%
Cognition 96%

Feasibility of use scenarios

Grade
3.8
The highest grade is 6.

On a normalised scale, the grade corresponds to 0.62 points. This value is weighted at 50% in the overall assessment.

Key findings

In the Android version of Threema, full settings management is accessible using the methods tested. The headings are semantically correct, except for a few exceptions. The switches and links are understandable and correctly labelled. Outside of the settings page, as in the iOS version, the keyboard usability is severely restricted: for example, it is not possible to make calls and delete or forward messages, as these functions are not focused. What’s more, users cannot use the keyboard to return to the overall overview from a chat. The keyboard focus is often not visible, which makes navigation with technical aids very difficult. When enlarging texts, the font size is not adjusted everywhere; overlaps occur in the chat overview. The status messages are accessible: for example, screen reader users receive the feedback ‘Call ended’ or ‘Survey created successfully’.

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