diff --git a/megalodon/src/detector.ts b/megalodon/src/detector.ts
index ad467dae..b90c8292 100644
--- a/megalodon/src/detector.ts
+++ b/megalodon/src/detector.ts
@@ -74,7 +74,7 @@ export const detector = async (url: string): Promise<'mastodon' | 'pleroma' | 'f
         case 'gotosocial':
           return 'gotosocial'
         default:
-          if (res.data.metadata.upstream?.name && res.data.metadata.upstream.name === 'mastodon') {
+          if (res.data.metadata.upstream?.name && res.data.metadata.upstream.name.toLowerCase() === 'mastodon') {
             return 'mastodon'
           }
           throw new NodeinfoError('Unknown SNS')
@@ -98,7 +98,7 @@ export const detector = async (url: string): Promise<'mastodon' | 'pleroma' | 'f
         case 'gotosocial':
           return 'gotosocial'
         default:
-          if (res.data.metadata.upstream?.name && res.data.metadata.upstream.name === 'mastodon') {
+          if (res.data.metadata.upstream?.name && res.data.metadata.upstream.name.toLowerCase() === 'mastodon') {
             return 'mastodon'
           }
           throw new NodeinfoError('Unknown SNS')
@@ -122,7 +122,7 @@ export const detector = async (url: string): Promise<'mastodon' | 'pleroma' | 'f
         case 'gotosocial':
           return 'gotosocial'
         default:
-          if (res.data.metadata.upstream?.name && res.data.metadata.upstream.name === 'mastodon') {
+          if (res.data.metadata.upstream?.name && res.data.metadata.upstream.name.toLowerCase() === 'mastodon') {
             return 'mastodon'
           }
           throw new NodeinfoError('Unknown SNS')
diff --git a/megalodon/test/integration/detector.spec.ts b/megalodon/test/integration/detector.spec.ts
index dbabed34..25251530 100644
--- a/megalodon/test/integration/detector.spec.ts
+++ b/megalodon/test/integration/detector.spec.ts
@@ -65,6 +65,14 @@ describe('detector', () => {
     })
   })
 
+  describe('kmy.blue', () => {
+    const url = 'https://kmy.blue'
+    it('should be mastodon', async () => {
+      const kmyblue = await detector(url)
+      expect(kmyblue).toEqual('mastodon')
+    })
+  })
+
   describe('unknown', () => {
     const url = 'https://google.com'
     it('should be null', async () => {