Fact · Dictation on phones and tablets
Apple says custom keyboards run in a sandbox whose default configuration disallows network access and prevents writing to the containing app's shared group containers.
Checked against its source on October 17, 2026
In the source's own words
“This sandbox’s default configuration disallows access to the network and prevents writing to the containing app’s shared group containers (reading is permitted).”
Configuring open access for a custom keyboard, Apple, Apple Developer Documentation, 2026, Discussion.
Open the original- What it measures
- Apple's developer documentation for keyboard extensions. This default applies to any third-party keyboard that does not ask for open access.
- What it does not show
- Describes the default configuration only. A keyboard that requests open access, and that the user allows, can use the network.