diff --git a/fish/.config/fish/functions/gdd.fish b/fish/.config/fish/functions/gdd.fish
index d822aa9..6eaec01 100644
--- a/fish/.config/fish/functions/gdd.fish
+++ b/fish/.config/fish/functions/gdd.fish
@@ -1,3 +1,9 @@
 function gdd --description "Use difftastic as a difftool"
-    git difftool --tool=difftastic $argv
+    if count $argv >/dev/null
+        git difftool --tool=difftastic $argv
+    else
+        set default (git symbolic-ref refs/remotes/origin/HEAD | awk -F'/' '{print $4}')
+        set current (git branch --show-current)
+        git difftool --tool=difftastic $default...$current
+    end
 end
diff --git a/fish/.config/fish/functions/gdk.fish b/fish/.config/fish/functions/gdk.fish
index da7df27..ba78ca8 100644
--- a/fish/.config/fish/functions/gdk.fish
+++ b/fish/.config/fish/functions/gdk.fish
@@ -1,3 +1,9 @@
 function gdk
-    git difftool --tool=kitty $argv
+    if count $argv >/dev/null
+        git difftool --tool=kitty $argv
+    else
+        set default (git symbolic-ref refs/remotes/origin/HEAD | awk -F'/' '{print $4}')
+        set current (git branch --show-current)
+        git difftool --tool=kitty $default...$current
+    end
 end
diff --git a/fish/.config/fish/functions/gdt.fish b/fish/.config/fish/functions/gdt.fish
index 476c1de..d4c7781 100644
--- a/fish/.config/fish/functions/gdt.fish
+++ b/fish/.config/fish/functions/gdt.fish
@@ -1,3 +1,9 @@
 function gdt
-    git --no-pager difftool $argv
+    if count $argv >/dev/null
+        git --no-pager difftool $argv
+    else
+        set default (git symbolic-ref refs/remotes/origin/HEAD | awk -F'/' '{print $4}')
+        set current (git branch --show-current)
+        git --no-pager difftool $default...$current
+    end
 end