diff --git a/README.md b/README.md
index 59af819..0abdd97 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,7 @@ use DrupalEnvironment\Environment;
 
 // These all return a boolean true/false
 Environment::isPantheon();
+Environment::isPlatformSh();
 Environment::isAcquia();
 Environment::isTugboat();
 Environment::isGitHubWorkflow();
diff --git a/src/DefaultEnvironment.php b/src/DefaultEnvironment.php
index c75824b..ca7d8fd 100644
--- a/src/DefaultEnvironment.php
+++ b/src/DefaultEnvironment.php
@@ -68,17 +68,28 @@ public static function get(string $name)
     }
 
     /**
-     * Return the environment name.
+     * Return the environment type.
      *
      * For example: "local" or "ci" or "dev" or "prod".
      *
      * @return string|bool
-     *   The name of the environment.
+     *   The type of the environment.
      */
     public static function getEnvironment(): string|bool
     {
         return static::get(static::ENVIRONMENT_NAME);
     }
+    
+    /**
+     * Return the user-defined environment name.
+     *
+     * @return string|bool
+     *   The name of the environment.
+     */
+    public static function getEnvironmentName(): string|bool
+    {
+        return static::getEnvironment();
+    }
 
     /**
      * Determine if this is a production environment.
diff --git a/src/Environment.php b/src/Environment.php
index eaf291a..6f487d9 100644
--- a/src/Environment.php
+++ b/src/Environment.php
@@ -7,8 +7,10 @@
  * Helpers for working with the Drupal environment.
  *
  * @method static string getEnvironment()
+ * @method static string|bool getEnvironmentName()
  * @method static bool isAcquia()
  * @method static bool isPantheon()
+ * @method static bool isPlatformSh()
  * @method static bool isProduction()
  * @method static bool isStaging()
  * @method static bool isDevelopment()
@@ -29,6 +31,7 @@ class Environment
     public const CLASSES = [
         'isAcquia' => Acquia::class,
         'isPantheon' => Pantheon::class,
+        'isPlatformSh' => PlatformSh::class,
         'isTugboat' => Tugboat::class,
         'isGitHubWorkflow' => GitHubWorkflow::class,
         'isGitLabCi' => GitLabCi::class,
diff --git a/src/PlatformSh.php b/src/PlatformSh.php
new file mode 100644
index 0000000..923bd1a
--- /dev/null
+++ b/src/PlatformSh.php
@@ -0,0 +1,93 @@
+<?php
+
+namespace DrupalEnvironment;
+
+/**
+ * The Platform.sh environment specifics.
+ *
+ * @see https://docs.platform.sh/environments.html
+ *
+ * @internal
+ */
+class PlatformSh extends DefaultEnvironment
+{
+
+    /**
+     * The default environment variable name.
+     *
+     * @var string
+     */
+    public const ENVIRONMENT_TYPE = 'PLATFORM_ENVIRONMENT_TYPE';
+
+    /**
+     * {@inheritdoc}
+     */
+    public const ENVIRONMENT_NAME = 'PLATFORM_ENVIRONMENT';
+
+    /**
+     * {@inheritdoc}
+     */
+    public const PRODUCTION = 'production';
+
+    /**
+     * {@inheritdoc}
+     */
+    public const STAGING = 'staging';
+
+    /**
+     * {@inheritdoc}
+     */
+    public const DEVELOPMENT = 'development';
+
+    /**
+     * {@inheritdoc}
+     */
+    public static function getEnvironment(): string
+    {
+        return static::get(static::ENVIRONMENT_TYPE) ?: 'local';
+    }
+
+    /**
+     * Return the user-defined environment name.
+     *
+     * @return string|bool
+     *   The name of the environment.
+     */
+    public static function getEnvironmentName(): string|bool
+    {
+        return static::get(static::ENVIRONMENT_NAME);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public static function isProduction(): bool
+    {
+        return static::getEnvironment() === static::PRODUCTION;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public static function isStaging(): bool
+    {
+        return static::getEnvironment() === static::STAGING;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public static function isDevelopment(): bool
+    {
+        return static::getEnvironment() === static::DEVELOPMENT && !static::isPreview();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public static function isPreview(): bool
+    {
+        // If the branch looks like "pr-123" then it's a pull request environment.
+        return preg_match('/^pr-\d+$/', static::get("PLATFORM_BRANCH"));
+    }
+}
diff --git a/tests/src/EnvironmentTest.php b/tests/src/EnvironmentTest.php
index 1b24b3b..f7db443 100644
--- a/tests/src/EnvironmentTest.php
+++ b/tests/src/EnvironmentTest.php
@@ -105,6 +105,7 @@ public static function providerEnvironment(): array
                     'isGitLabCi' => false,
                     'isTugboat' => false,
                     'isPantheon' => false,
+                    'isPlatformSh' => false,
                     'isProduction' => false,
                     'isStaging' => false,
                     'isDevelopment' => false,
@@ -131,6 +132,7 @@ public static function providerEnvironment(): array
                     'isGitLabCi' => false,
                     'isTugboat' => false,
                     'isPantheon' => false,
+                    'isPlatformSh' => false,
                     'isProduction' => true,
                     'isStaging' => false,
                     'isDevelopment' => false,
@@ -158,6 +160,7 @@ public static function providerEnvironment(): array
                     'isGitLabCi' => false,
                     'isTugboat' => false,
                     'isPantheon' => false,
+                    'isPlatformSh' => false,
                     'isProduction' => false,
                     'isStaging' => false,
                     'isDevelopment' => false,
@@ -184,6 +187,7 @@ public static function providerEnvironment(): array
                     'isGitLabCi' => false,
                     'isTugboat' => false,
                     'isPantheon' => true,
+                    'isPlatformSh' => false,
                     'isProduction' => true,
                     'isStaging' => false,
                     'isDevelopment' => false,
@@ -216,6 +220,7 @@ public static function providerEnvironment(): array
                     'isGitLabCi' => false,
                     'isTugboat' => false,
                     'isPantheon' => true,
+                    'isPlatformSh' => false,
                     'isProduction' => false,
                     'isStaging' => true,
                     'isDevelopment' => false,
@@ -248,6 +253,7 @@ public static function providerEnvironment(): array
                     'isGitLabCi' => false,
                     'isTugboat' => false,
                     'isPantheon' => true,
+                    'isPlatformSh' => false,
                     'isProduction' => false,
                     'isStaging' => false,
                     'isDevelopment' => true,
@@ -280,6 +286,7 @@ public static function providerEnvironment(): array
                     'isGitLabCi' => false,
                     'isTugboat' => false,
                     'isPantheon' => true,
+                    'isPlatformSh' => false,
                     'isProduction' => false,
                     'isStaging' => false,
                     'isDevelopment' => false,
@@ -309,6 +316,7 @@ public static function providerEnvironment(): array
                     'isGitLabCi' => false,
                     'isTugboat' => false,
                     'isPantheon' => true,
+                    'isPlatformSh' => false,
                     'isProduction' => false,
                     'isStaging' => false,
                     'isDevelopment' => false,
@@ -334,6 +342,7 @@ public static function providerEnvironment(): array
                     'isGitLabCi' => false,
                     'isTugboat' => false,
                     'isPantheon' => true,
+                    'isPlatformSh' => false,
                     'isProduction' => false,
                     'isStaging' => false,
                     'isDevelopment' => false,
@@ -348,6 +357,127 @@ public static function providerEnvironment(): array
                     ],
                 ],
             ],
+            'platformsh-prod' => [
+                [
+                    'ENV' => [
+                        'PLATFORM_ENVIRONMENT' => 'main-asdf123',
+                        'PLATFORM_ENVIRONMENT_TYPE' => 'production',
+                    ],
+                ],
+                [
+                    'getEnvironment' => 'production',
+                    'getEnvironmentName' => 'main-asdf123',
+                    'isAcquia' => false,
+                    'isCircleCi' => false,
+                    'isGitHubWorkflow' => false,
+                    'isGitLabCi' => false,
+                    'isTugboat' => false,
+                    'isPantheon' => false,
+                    'isPlatformSh' => true,
+                    'isProduction' => true,
+                    'isStaging' => false,
+                    'isDevelopment' => false,
+                    'isPreview' => false,
+                    'isCi' => false,
+                    'isLocal' => false,
+                    'getIndicatorConfig' => [
+                        'name' => 'Production',
+                        'bg_color' => '#e7131a',
+                        'fg_color' => '#ffffff',
+                    ],
+                ],
+            ],
+            'platformsh-stage' => [
+                [
+                    'ENV' => [
+                        'PLATFORM_ENVIRONMENT' => 'stage-asdf123',
+                        'PLATFORM_ENVIRONMENT_TYPE' => 'staging',
+                    ],
+                ],
+                [
+                    'getEnvironment' => 'staging',
+                    'getEnvironmentName' => 'stage-asdf123',
+                    'isAcquia' => false,
+                    'isCircleCi' => false,
+                    'isGitHubWorkflow' => false,
+                    'isGitLabCi' => false,
+                    'isTugboat' => false,
+                    'isPantheon' => false,
+                    'isPlatformSh' => true,
+                    'isProduction' => false,
+                    'isStaging' => true,
+                    'isDevelopment' => false,
+                    'isPreview' => false,
+                    'isCi' => false,
+                    'isLocal' => false,
+                    'getIndicatorConfig' => [
+                        'name' => 'Staging',
+                        'bg_color' => '#b85c00',
+                        'fg_color' => '#ffffff',
+                    ],
+                ],
+            ],
+            'platformsh-dev' => [
+                [
+                    'ENV' => [
+                        'PLATFORM_ENVIRONMENT' => 'develop-asdf123',
+                        'PLATFORM_ENVIRONMENT_TYPE' => 'development',
+                    ],
+                ],
+                [
+                    'getEnvironment' => 'development',
+                    'getEnvironmentName' => 'develop-asdf123',
+                    'isAcquia' => false,
+                    'isCircleCi' => false,
+                    'isGitHubWorkflow' => false,
+                    'isGitLabCi' => false,
+                    'isTugboat' => false,
+                    'isPantheon' => false,
+                    'isPlatformSh' => true,
+                    'isProduction' => false,
+                    'isStaging' => false,
+                    'isDevelopment' => true,
+                    'isPreview' => false,
+                    'isCi' => false,
+                    'isLocal' => false,
+                    'getIndicatorConfig' => [
+                        'name' => 'Development',
+                        'bg_color' => '#307b24',
+                        'fg_color' => '#ffffff',
+                    ],
+                ],
+            ],
+            'platformsh-preview' => [
+                [
+                    'ENV' => [
+                        'PLATFORM_ENVIRONMENT' => 'pr-225-asdf123',
+                        'PLATFORM_BRANCH' => 'pr-225',
+                        'PLATFORM_ENVIRONMENT_TYPE' => 'development',
+                    ],
+                ],
+                [
+                    'getEnvironment' => 'development',
+                    'getEnvironmentName' => 'pr-225-asdf123',
+                    'isAcquia' => false,
+                    'isCircleCi' => false,
+                    'isGitHubWorkflow' => false,
+                    'isGitLabCi' => false,
+                    'isTugboat' => false,
+                    'isPantheon' => false,
+                    'isPlatformSh' => true,
+                    'isProduction' => false,
+                    'isStaging' => false,
+                    'isDevelopment' => false,
+                    'isPreview' => true,
+                    'isCi' => false,
+                    'isLocal' => false,
+                    'getIndicatorConfig' => [
+                      'name' => 'Preview',
+                      'bg_color' => '#990055',
+                      'fg_color' => '#ffffff',
+                    ],
+                ],
+            ],
             'tugboat' => [
                 [
                     'ENV' => [
@@ -362,6 +492,7 @@ public static function providerEnvironment(): array
                     'isGitLabCi' => false,
                     'isTugboat' => true,
                     'isPantheon' => false,
+                    'isPlatformSh' => false,
                     'isProduction' => false,
                     'isStaging' => false,
                     'isDevelopment' => false,
@@ -390,6 +521,7 @@ public static function providerEnvironment(): array
                     'isGitLabCi' => false,
                     'isTugboat' => false,
                     'isPantheon' => false,
+                    'isPlatformSh' => false,
                     'isProduction' => false,
                     'isStaging' => false,
                     'isDevelopment' => false,
@@ -414,6 +546,7 @@ public static function providerEnvironment(): array
                     'isGitLabCi' => false,
                     'isTugboat' => false,
                     'isPantheon' => false,
+                    'isPlatformSh' => false,
                     'isProduction' => false,
                     'isStaging' => false,
                     'isDevelopment' => false,
@@ -438,6 +571,7 @@ public static function providerEnvironment(): array
                     'isGitLabCi' => true,
                     'isTugboat' => false,
                     'isPantheon' => false,
+                    'isPlatformSh' => false,
                     'isProduction' => false,
                     'isStaging' => false,
                     'isDevelopment' => false,
@@ -461,6 +595,7 @@ public static function providerEnvironment(): array
                     'isGitLabCi' => false,
                     'isTugboat' => false,
                     'isPantheon' => false,
+                    'isPlatformSh' => false,
                     'isProduction' => false,
                     'isStaging' => false,
                     'isDevelopment' => false,
@@ -488,6 +623,7 @@ public static function providerEnvironment(): array
                     'isGitLabCi' => false,
                     'isTugboat' => false,
                     'isPantheon' => false,
+                    'isPlatformSh' => false,
                     'isProduction' => false,
                     'isStaging' => false,
                     'isDevelopment' => false,