Mobile OS compatibility

D1 SDK supports multiple operating systems (OS) for both the iOS and Android platforms.

The compatibility of every OS update is tested with the latest D1 SDK version.

Mobile operating system versions

The versioning of each mobile OS release is defined in accordance to semantic versioning system, MAJOR.MINOR.PATCH where:

• A MAJOR version is used when incompatible API changes are made.
• A MINOR version is used when the functionality added is backward compatible with the previous version.
• A PATCH version is used when backward compatible bug fixes are made.

The exact version numbering of each OS is defined by the respective mobile OS providers and is subject to changes.

Typically, beta versions of the mobile OS are published ahead of the actual launch to allow issuer application developers to test the compatibility of their issuer applications on the mobile OS, where:

• The number of published beta versions and the dates they are published before the actual release are dependent from the mobile OS provider strategy.
• The exact publication date of the actual release is not disclosed by mobile OS providers as this depends on the feedbacks received from the beta releases.

iOS compatibility status

Version	Release date	Status
27 Beta2	2026-06-23	OK
26.6 Beta2	2026-06-16	OK

Issue on iOS 26 Dev beta 4 has been fixed on SDK v4.1.0

Android compatibility status

Version	Release date	Status
17 Public Release	2026-06-17	OK

Updated: July 2026