diff --git a/README.md b/README.md
index aedc231..ce1f1d6 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,7 @@ These themes have been tested and work:
 - Pop (Pop!_OS default)
 - Prof-Gnome-3
 - Qogir
+- Simply Circles
 - Teja
 - Vimix
 - Yaru (Ubuntu default)
diff --git a/ego_description.txt b/ego_description.txt
index 849ca3e..a7a0897 100644
--- a/ego_description.txt
+++ b/ego_description.txt
@@ -19,6 +19,7 @@ These themes have been tested and work:
 - Pop (Pop!_OS default)
 - Prof-Gnome-3
 - Qogir
+- Simply Circles
 - Teja
 - Vimix
 - Yaru (Ubuntu default)
diff --git a/src/modules/Variants.js b/src/modules/Variants.js
index a1cde44..05539c1 100644
--- a/src/modules/Variants.js
+++ b/src/modules/Variants.js
@@ -89,6 +89,10 @@ var Variants = class {
 			variants.set('day', name.replace(/-Dark(?!er)/, '-Light'));
 			variants.set('night', variants.get('day').replace(/(-Light(-DS)?|-Darker)/, '-Dark'))
 		}
+		else if ( name.includes('Simply_Circles') ) {
+			variants.set('day', name.replace('_Dark', '_Light'));
+			variants.set('night', name.replace('_Light', '_Dark'));
+		}
 		else if ( name.includes('Teja') ) {
 			const dark_variant = '_' + (name.replace('_Light').split('_')[1] || 'Dark');
 			variants.set('day', name.replace(/(_Dark(est)?|_Black)/, ''));
diff --git a/tests/Simply-Circles.js b/tests/Simply-Circles.js
new file mode 100644
index 0000000..125e214
--- /dev/null
+++ b/tests/Simply-Circles.js
@@ -0,0 +1,37 @@
+/*
+Night Theme Switcher Gnome Shell extension
+
+Copyright (C) 2020 Romain Vigier
+
+This program is free software: you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation, either version 3 of the License, or (at your option) any later
+version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program. If not, see <http s ://www.gnu.org/licenses/>.
+*/
+
+const test = require('ava');
+const { Variants } = require('./_variants');
+
+
+['', '_Blue', '_Cyan', '_Green', '_Orange', '_Purple'].forEach(color => {
+	['', '_Envolved'].forEach(variant => {
+		test(`Simply_Circles${color}_Light${variant}`, t => {
+			const variants = Variants.guess_from(`Simply_Circles${color}_Light${variant}`);
+			t.is(variants.get('day'), `Simply_Circles${color}_Light${variant}`);
+			t.is(variants.get('night'), `Simply_Circles${color}_Dark${variant}`);
+		});
+
+		test(`Simply_Circles${color}${variant}`, t => {
+			const variants = Variants.guess_from(`Simply_Circles${color}_Dark${variant}`);
+			t.is(variants.get('day'), `Simply_Circles${color}_Light${variant}`);
+			t.is(variants.get('night'), `Simply_Circles${color}_Dark${variant}`);
+		});
+	})
+});