diff --git a/lightly_studio_view/src/lib/components/DatasetDistributionPanel/DatasetDistributionPanel.test.ts b/lightly_studio_view/src/lib/components/DatasetDistributionPanel/DatasetDistributionPanel.test.ts
index f88960a29..6dd76c039 100644
--- a/lightly_studio_view/src/lib/components/DatasetDistributionPanel/DatasetDistributionPanel.test.ts
+++ b/lightly_studio_view/src/lib/components/DatasetDistributionPanel/DatasetDistributionPanel.test.ts
@@ -46,6 +46,24 @@ if (typeof globalThis.ResizeObserver === 'undefined') {
 }
 
 const defaultProps = { data: balanced };
+const comparisonData = [
+    {
+        sample_tag_id: 'tag-a',
+        sample_tag_name: 'Reviewed',
+        counts: [
+            { label_name: 'car', count: 2 },
+            { label_name: 'dog', count: 0 }
+        ]
+    },
+    {
+        sample_tag_id: 'tag-b',
+        sample_tag_name: 'Priority',
+        counts: [
+            { label_name: 'car', count: 1 },
+            { label_name: 'dog', count: 5 }
+        ]
+    }
+];
 
 describe('DatasetDistributionPanel', () => {
     beforeAll(() => {
@@ -195,6 +213,65 @@ describe('DatasetDistributionPanel', () => {
         expect(screen.queryByTestId('dataset-distribution-source-select')).not.toBeInTheDocument();
     });
 
+    it('ranks comparison classes by aggregate counts and keeps tag series independent', async () => {
+        render(DatasetDistributionPanel, {
+            props: {
+                sources: [
+                    {
+                        id: 'classes',
+                        label: 'Annotation classes',
+                        data: [{ label: 'car', count: 10 }],
+                        comparisonData
+                    }
+                ]
+            }
+        });
+
+        const option = echartsMock.instance.setOption.mock.lastCall?.[0] as {
+            yAxis: { data: string[] };
+            series: { name: string; data: number[] }[];
+        };
+        expect(option.yAxis.data).toEqual(['dog', 'car']);
+        expect(option.series).toMatchObject([
+            { name: 'Reviewed', data: [0, 2] },
+            { name: 'Priority', data: [5, 1] }
+        ]);
+        expect(screen.getByText(/2 sample tags/)).toBeInTheDocument();
+        expect(screen.queryByText(/annotations/)).not.toBeInTheDocument();
+
+        await fireEvent.click(screen.getByTestId('dataset-distribution-expand'));
+        await waitFor(() => expect(screen.getAllByText(/2 sample tags/)).toHaveLength(2));
+    });
+
+    it('renders comparison data from the selected annotation-type group', async () => {
+        const user = userEvent.setup();
+        render(DatasetDistributionPanel, {
+            props: {
+                sources: [
+                    {
+                        id: 'classes',
+                        label: 'Annotation classes',
+                        groupLabel: 'Annotation type',
+                        groups: [
+                            { id: 'all', label: 'All types', data: balanced },
+                            {
+                                id: 'classification',
+                                label: 'Classification',
+                                data: [{ label: 'car', count: 3 }],
+                                comparisonData
+                            }
+                        ]
+                    }
+                ]
+            }
+        });
+
+        await user.click(screen.getByTestId('dataset-distribution-group-select'));
+        await user.click(screen.getByText('Classification'));
+
+        await waitFor(() => expect(screen.getByText(/2 sample tags/)).toBeInTheDocument());
+    });
+
     it('defaults to the first source with content when a leading source is empty', () => {
         const sources: DistributionSource[] = [
             { id: 'all', label: 'All types', data: [], valueNoun: 'annotations' },
diff --git a/lightly_studio_view/src/lib/components/DatasetDistributionPanel/TagComparisonSelect.test.ts b/lightly_studio_view/src/lib/components/DatasetDistributionPanel/TagComparisonSelect.test.ts
new file mode 100644
index 000000000..099e21994
--- /dev/null
+++ b/lightly_studio_view/src/lib/components/DatasetDistributionPanel/TagComparisonSelect.test.ts
@@ -0,0 +1,45 @@
+import { render, screen } from '@testing-library/svelte';
+import userEvent from '@testing-library/user-event';
+import { beforeAll, describe, expect, it, vi } from 'vitest';
+import TagComparisonSelect from './TagComparisonSelect.svelte';
+
+const items = [
+    { value: 'tag-a', label: 'Reviewed' },
+    { value: 'tag-b', label: 'Priority' }
+];
+
+describe('TagComparisonSelect', () => {
+    beforeAll(() => {
+        Element.prototype.scrollIntoView = vi.fn();
+    });
+
+    it('selects a tag without mutating the controlled value', async () => {
+        const user = userEvent.setup();
+        const onChange = vi.fn();
+        render(TagComparisonSelect, { props: { items, selectedIds: [], onChange } });
+
+        await user.click(screen.getByTestId('dataset-distribution-tag-select'));
+        await user.click(screen.getByText('Reviewed'));
+
+        expect(onChange).toHaveBeenCalledWith(['tag-a']);
+        expect(screen.getByTestId('dataset-distribution-tag-select')).toHaveTextContent(
+            'Compare sample tags'
+        );
+    });
+
+    it('deselects an already selected tag', async () => {
+        const user = userEvent.setup();
+        const onChange = vi.fn();
+        render(TagComparisonSelect, {
+            props: { items, selectedIds: ['tag-a'], onChange }
+        });
+
+        expect(screen.getByTestId('dataset-distribution-tag-select')).toHaveTextContent(
+            '1 tag selected'
+        );
+        await user.click(screen.getByTestId('dataset-distribution-tag-select'));
+        await user.click(screen.getByText('Reviewed'));
+
+        expect(onChange).toHaveBeenCalledWith([]);
+    });
+});