diff --git a/.config/bash/module/Docker.sh b/.config/bash/module/Docker.sh
index 2638e91..f5bc8fa 100644
--- a/.config/bash/module/Docker.sh
+++ b/.config/bash/module/Docker.sh
@@ -20,11 +20,6 @@ function docker_update() {
 	docker images --format "{{.Repository}}:{{.Tag}}" | xargs -L1 docker pull
 }
 
-# Prune everything.
-function docker_prune() {
-	docker system prune --volumes --all
-}
-
 # Docker compose shortcut.
 function dc() {
 	docker compose "${@}"
diff --git a/.config/bash/module/Nix.sh b/.config/bash/module/Nix.sh
index fae7603..7e85c05 100644
--- a/.config/bash/module/Nix.sh
+++ b/.config/bash/module/Nix.sh
@@ -26,12 +26,6 @@ function nix_update() {
 	nix flake update "${_nix_system_config}"
 }
 
-# Free up root space.
-function nix_prune() {
-	nix-collect-garbage -d
-	_is_root && nix-store --gc
-}
-
 # Spawn shell with specified nix environment.
 # Uses flake.nix in current dir by default.
 # Usage: nix_shell [NAME]
diff --git a/.config/bash/module/Prune.sh b/.config/bash/module/Prune.sh
new file mode 100644
index 0000000..1905d07
--- /dev/null
+++ b/.config/bash/module/Prune.sh
@@ -0,0 +1,25 @@
+export _flatpakcfg_path="${HOME}/.config/linux/Flatpak.txt"
+
+# Prune everything unused in docker.
+function prune_docker() {
+	docker system prune --volumes --all
+}
+
+# Prune Nix Store.
+function prune_nix() {
+	nix-collect-garbage -d
+	_is_root && nix-store --gc
+}
+
+# Uninstall flatpaks not listed in the config.
+function prune_flatpak() {
+	local IFS=$'\n'
+	local config=($(cat ${_flatpakcfg_path} | cut -f2))
+	local installed=($(flatpak list --app | cut -f2))
+
+	process() {
+		_contains ${target} ${config[@]} || flatpak uninstall ${target}
+	}
+
+	_iterate_targets process ${installed[@]}
+}
diff --git a/.doc/Bash.md b/.doc/Bash.md
index 2f231be..f399c5f 100644
--- a/.doc/Bash.md
+++ b/.doc/Bash.md
@@ -132,7 +132,6 @@ Command|Description
 `docker_health`|  Check if any container exited. 
 `docker_ip <CONTAINER>`|Find out container's IP address.   
 `docker_update`|  Update all docker images. 
-`docker_prune`|  Prune everything. 
 `dc`|  Docker compose shortcut. 
 `dcu [SERVICES]`|Docker compose up.   
 `dcd [SERVICES]`|Docker compose down.   
@@ -270,7 +269,6 @@ Command|Description
 `nix_rebuild [HOSTNAME]`|Rebuild system. Optionally force the hostname.   
 `nix_switch [HOSTNAME]`|Rebuild and switch system. Optionally force the hostname.   
 `nix_update`|Update system versions.   
-`nix_prune`|  Free up root space. 
 `nix_shell [NAME]`|Spawn shell with specified nix environment. Uses flake.nix in current dir by default.   
 `nix_tmpshell <PACKAGES>`|Spawn nix-shell with specified packages.   
 `nix_live`|  Build live image. 
@@ -321,6 +319,14 @@ Command|Description
 `perm_share`|  Recursively change permissions to allow read sharing with group and others. 
 `perm`|  Recursively change permissions to restrict access for group and others. 
 
+## Prune.
+
+Command|Description
+---|---
+`prune_docker`|  Prune everything unused in docker. 
+`prune_nix`|  Prune Nix Store. 
+`prune_flatpak`|  Uninstall flatpaks not listed in the config. 
+
 ## Ps.
 
 Command|Description