diff --git a/crates/llm/Cargo.toml b/crates/llm/Cargo.toml
index a523bcc..a6a6067 100644
--- a/crates/llm/Cargo.toml
+++ b/crates/llm/Cargo.toml
@@ -3,11 +3,22 @@ name = "kon-llm"
 version = "0.1.0"
 edition = "2021"
 
+[features]
+# Default desktop build keeps the existing openmp + vulkan acceleration.
+# Mobile / CPU-only targets can drop one or both via:
+#   cargo build -p kon-llm --no-default-features
+# These are independent so an Android Vulkan build can opt into vulkan
+# without openmp (the NDK ships OpenMP libs but the toolchain configuration
+# is fragile across NDK versions).
+default = ["gpu-vulkan", "openmp"]
+gpu-vulkan = ["llama-cpp-2/vulkan"]
+openmp = ["llama-cpp-2/openmp"]
+
 [dependencies]
 kon-core = { path = "../core" }
 encoding_rs = "0.8"
 futures-util = "0.3"
-llama-cpp-2 = { version = "0.1.144", default-features = false, features = ["openmp", "vulkan"] }
+llama-cpp-2 = { version = "0.1.144", default-features = false }
 num_cpus = "1"
 reqwest = { version = "0.12", default-features = false, features = ["rustls-tls", "stream"] }
 serde = { version = "1", features = ["derive"] }
diff --git a/crates/transcription/Cargo.toml b/crates/transcription/Cargo.toml
index d012d14..1b9e240 100644
--- a/crates/transcription/Cargo.toml
+++ b/crates/transcription/Cargo.toml
@@ -6,13 +6,19 @@ description = "Speech-to-text engine wrappers, model management, and inference c
 build = "build.rs"
 
 [features]
-# Whisper backend (direct whisper-rs, vulkan-accelerated). Default on —
-# gating it exists so a future Windows non-AVX2 build, or a cloud-only
-# ASR configuration, can drop whisper-rs-sys entirely per brief item
-# #13. Disabling this feature also drops the WhisperRsBackend module
-# and the load_whisper entry point.
-default = ["whisper"]
+# Whisper backend (direct whisper-rs). Default on — gating it exists so
+# a future Windows non-AVX2 build, or a cloud-only ASR configuration,
+# can drop whisper-rs-sys entirely per brief item #13. Disabling this
+# feature also drops the WhisperRsBackend module and the load_whisper
+# entry point.
+#
+# `whisper-vulkan` is a separate feature so a non-Vulkan target (Android
+# without GPU drivers, a CPU-only Windows build) can pull in whisper-rs
+# but skip the Vulkan backend. Build CPU-only with:
+#   cargo build -p kon-transcription --no-default-features --features whisper
+default = ["whisper", "whisper-vulkan"]
 whisper = ["dep:whisper-rs", "dep:num_cpus"]
+whisper-vulkan = ["whisper-rs?/vulkan"]
 
 [dependencies]
 kon-core = { path = "../core" }
@@ -30,8 +36,9 @@ futures-util = "0.3"
 # Download integrity verification
 sha2 = "0.10"
 
-# Gated behind the `whisper` feature (see [features] above).
-whisper-rs = { version = "0.16", default-features = false, features = ["vulkan"], optional = true }
+# Gated behind the `whisper` feature (see [features] above). Vulkan is
+# additive via the `whisper-vulkan` feature so non-GPU targets can drop it.
+whisper-rs = { version = "0.16", default-features = false, optional = true }
 
 # Direct whisper-rs backend (WhisperRsBackend): thread pool sizing.
 # Gated alongside whisper-rs since no other code in this crate needs it.