diff --git a/src/Strings/Multibyte/OmniString.php b/src/Strings/Multibyte/OmniString.php
--- a/src/Strings/Multibyte/OmniString.php
+++ b/src/Strings/Multibyte/OmniString.php
@@ -63,6 +63,28 @@
         return mb_strlen($this->value, $this->encoding);
     }
 
+    public function getChars () : array {
+        $chars = [];
+
+        $len = $this->len();
+        for ($i = 0 ; $i < $len ; $i++) {
+            $chars[] = mb_substr($this->value, $i, 1, $this->encoding);
+        }
+
+        return $chars;
+    }
+
+    public function getBigrams () {
+        $bigrams = [];
+
+        $len = $this->len();
+        for ($i = 0 ; $i < $len - 1 ; $i++) {
+            $bigrams[] = mb_substr($this->value, $i, 2, $this->encoding);
+        }
+
+        return $bigrams;
+    }
+
     /**
      * @return string
      */
@@ -77,4 +99,5 @@
         $this->value = $value;
     }
 
+
 }
diff --git a/src/Strings/SorensenDiceCoefficient.php b/src/Strings/SorensenDiceCoefficient.php
new file mode 100644
--- /dev/null
+++ b/src/Strings/SorensenDiceCoefficient.php
@@ -0,0 +1,55 @@
+<?php
+declare(strict_types=1);
+
+namespace Keruald\OmniTools\Strings;
+
+use Keruald\OmniTools\Strings\Multibyte\OmniString;
+
+class SorensenDiceCoefficient {
+
+    /**
+     * @var string[]
+     */
+    private $x;
+
+    /**
+     * @var string[]
+     */
+    private $y;
+
+    ///
+    /// Constructors
+    ///
+
+    public function __construct (string $left, string $right) {
+        $this->x = (new OmniString($left))->getBigrams();
+        $this->y = (new OmniString($right))->getBigrams();
+    }
+
+    public static function computeFor(string $left, string $right) : float {
+        $instance = new self($left, $right);
+
+        return $instance->compute();
+    }
+
+    ///
+    /// Sørensen formula
+    ///
+
+    public function compute() : float {
+        return 2 * $this->countIntersect()
+               /
+               $this->countCharacters();
+    }
+
+    private function countIntersect () : int {
+        $intersect = array_intersect($this->x, $this->y);
+
+        return count($intersect);
+    }
+
+    private function countCharacters () : int {
+        return count($this->x) + count($this->y);
+    }
+
+}
diff --git a/tests/Strings/Multibyte/OmniStringTest.php b/tests/Strings/Multibyte/OmniStringTest.php
--- a/tests/Strings/Multibyte/OmniStringTest.php
+++ b/tests/Strings/Multibyte/OmniStringTest.php
@@ -49,4 +49,50 @@
         $this->assertEquals(3, $this->string->len());
     }
 
+    /**
+     * @dataProvider provideCharactersArrays
+     */
+    public function testGetChars (string $string, array $expectedCharacters) : void {
+        $actualCharacters = (new OmniString($string))->getChars();
+
+        $this->assertEquals($expectedCharacters, $actualCharacters);
+    }
+
+    /**
+     * @dataProvider provideCharactersBigrams
+     */
+    public function testBigrams (string $string, array $expectedBigrams) : void {
+        $actualBigrams = (new OmniString($string))->getBigrams();
+
+        $this->assertEquals($expectedBigrams, $actualBigrams);
+    }
+
+    ///
+    /// Data providers
+    ///
+
+    public function provideCharactersArrays () : iterable {
+        yield ["foo", ['f', 'o', 'o']];
+
+        yield [
+            'àèòàFOOàèòà',
+            ['à', 'è', 'ò', 'à', 'F', 'O', 'O', 'à', 'è', 'ò', 'à']
+        ];
+
+        yield ["🇩🇪", ["🇩", "🇪"]];
+
+        yield ["", []];
+    }
+
+
+    public function provideCharactersBigrams () : iterable {
+        yield ["foo", ['fo', 'oo']];
+
+        yield ["night", ['ni', 'ig', 'gh', 'ht']];
+
+        yield ["🇩🇪", ["🇩🇪"]];
+
+        yield ["", []];
+    }
+
 }
diff --git a/tests/Strings/SorensenDiceCoefficientTest.php b/tests/Strings/SorensenDiceCoefficientTest.php
new file mode 100644
--- /dev/null
+++ b/tests/Strings/SorensenDiceCoefficientTest.php
@@ -0,0 +1,16 @@
+<?php
+declare(strict_types=1);
+
+namespace Keruald\OmniTools\Tests\Strings;
+
+use Keruald\OmniTools\Strings\SorensenDiceCoefficient;
+use PHPUnit\Framework\TestCase;
+
+class SorensenDiceCoefficientTest extends TestCase {
+
+    public function testCoefficient () : void {
+        $actual = new SorensenDiceCoefficient('night', 'nacht');
+
+        $this->assertEquals(0.25, $actual->compute());
+    }
+}