org.jetbrains.annotations

Nothing outside the APK knows this package by name - an in-house module, or a private SDK. What follows is what the code itself says.

In 30% of apps checked

What it contains30

Classes under this package in the newest build that carries it - Viber 29.1.1.0.

Class
org.jetbrains.annotations.ApiStatus
org.jetbrains.annotations.ApiStatus$AvailableSince
org.jetbrains.annotations.ApiStatus$Experimental
org.jetbrains.annotations.ApiStatus$Internal
org.jetbrains.annotations.ApiStatus$NonExtendable
org.jetbrains.annotations.ApiStatus$OverrideOnly
org.jetbrains.annotations.ApiStatus$ScheduledForRemoval
org.jetbrains.annotations.Async
org.jetbrains.annotations.Async$Execute
org.jetbrains.annotations.Async$Schedule
org.jetbrains.annotations.Blocking
org.jetbrains.annotations.BlockingExecutor
org.jetbrains.annotations.Contract
org.jetbrains.annotations.Debug
org.jetbrains.annotations.Debug$Renderer
org.jetbrains.annotations.MustBeInvokedByOverriders
org.jetbrains.annotations.Nls
org.jetbrains.annotations.Nls$Capitalization
org.jetbrains.annotations.NonBlocking
org.jetbrains.annotations.NonBlockingExecutor
org.jetbrains.annotations.NonNls
org.jetbrains.annotations.NotNull
org.jetbrains.annotations.Nullable
org.jetbrains.annotations.PropertyKey
org.jetbrains.annotations.Range
org.jetbrains.annotations.TestOnly
org.jetbrains.annotations.UnknownNullability
org.jetbrains.annotations.Unmodifiable
org.jetbrains.annotations.UnmodifiableView
org.jetbrains.annotations.VisibleForTesting

Each app's newest build, the most recently checked first. Where the version comes from is the file that states it.

App	App version	Classes
Viber com.viber.voip	29.1.1.0	30
Vita Mahjong com.vitastudio.mahjong	3.42.1	30
Block Blast! com.block.juggle	10.8.4	30
Zoho Mail com.zoho.mail	3.7.2	30
SHEIN com.zzkko	15.4.6	30
Reserved com.lppsa.app.reserved	3.13.0	33
Duolingo com.duolingo	6.100.3	30
Tile Explorer com.oakever.tiletrip	2.3.0	30
DuckDuckGo com.duckduckgo.mobile.android	5.297.1	30
E Zdravlje com.nites.ezdravljeRS	2.2.15	30
Bolt ee.mtakso.client	CA.228.0	33
Polovni automobili com.infostud.android.pa	9.2.1	30
and more