diff --git a/src/musiclib/noteset.py b/src/musiclib/noteset.py
index a0fec3a5..b205192f 100644
--- a/src/musiclib/noteset.py
+++ b/src/musiclib/noteset.py
@@ -300,62 +300,3 @@ def subsets(noteset: NoteSet, min_notes: int = 1) -> frozenset[NoteSet]:
         for notes in itertools.combinations(noteset, n_subset):
             out.add(NoteSet(frozenset(notes)))
     return frozenset(out)
-
-
-class ComparedNoteSets(Cached, ReprSVGMixin):
-    """
-    this is compared scale
-    local terminology: left scale is compared to right
-    left is kinda parent, right is kinda child
-    """
-
-    def __init__(self, left: NoteSet, right: NoteSet) -> None:
-        if not (isinstance(left, NoteSet) and isinstance(right, NoteSet)):
-            raise TypeError(f'expected NoteSet, got {type(left)} and {type(right)}')
-        self.left = left
-        self.right = right
-        self.key = left, right
-        self.shared_notes = frozenset(left.notes) & frozenset(right.notes)
-        self.new_notes = frozenset(right.notes) - frozenset(left.notes)
-        self.del_notes = frozenset(left.notes) - frozenset(right.notes)
-
-    def __eq__(self, other: object) -> bool:
-        if not isinstance(other, ComparedNoteSets):
-            raise TypeError
-        return self.key == other.key
-
-    def __hash__(self) -> int:
-        return hash(self.key)
-
-    def __str__(self) -> str:
-        return f'{self.left} | {self.right}'
-
-    def __repr__(self) -> str:
-        return f'ComparedNoteSets({self})'
-
-    def svg_piano(self, **kwargs: Any) -> svg.SVG:
-        from musiclib.svg.card import Piano
-        kwargs = pickle.loads(pickle.dumps(kwargs))  # faster than copy.deepcopy
-        setdefault_path(
-            kwargs,
-            'regular_piano_kwargs.note_colors',
-            dict.fromkeys(self.del_notes, config.RED) |
-            dict.fromkeys(self.new_notes, config.GREEN) |
-            dict.fromkeys(self.shared_notes, config.BLUE),
-        )
-        setdefault_path(kwargs, 'header_kwargs.title', str(self))
-        return Piano(**kwargs).svg
-
-    def svg_plane_piano(self, **kwargs: Any) -> svg.SVG:
-        from musiclib.svg.card import PlanePiano
-        kwargs = pickle.loads(pickle.dumps(kwargs))  # faster than copy.deepcopy
-        n0 = Note(config.chromatic_notes[0])
-        setdefault_path(kwargs, 'header_kwargs.title', str(self))
-        kwargs.setdefault(
-            'interval_colors',
-            dict.fromkeys([n - n0 for n in self.del_notes], config.RED) |
-            dict.fromkeys([n - n0 for n in self.new_notes], config.GREEN) |
-            dict.fromkeys([n - n0 for n in self.shared_notes], config.BLUE),
-        )
-        kwargs.setdefault('interval_text', FromIntervalDict({n - n0: str(n) for n in CHROMATIC_NOTESET}, abstract=True))
-        return PlanePiano(**kwargs).svg
diff --git a/tests/noteset_test.py b/tests/noteset_test.py
index 18c9768c..28474ed6 100644
--- a/tests/noteset_test.py
+++ b/tests/noteset_test.py
@@ -6,7 +6,6 @@
 from musiclib.interval import AbstractInterval
 from musiclib.note import Note
 from musiclib.note import SpecificNote
-from musiclib.noteset import ComparedNoteSets
 from musiclib.noteset import NoteSet
 from musiclib.scale import Scale
 
@@ -237,14 +236,3 @@ def test_subtract_types():
         noteset.subtract('C', SpecificNote('D', 1))  # type: ignore[arg-type]
     with pytest.raises(TypeError):
         noteset.subtract('D1', Note('C'))  # type: ignore[arg-type]
-
-
-def test_compared():
-    left = Scale.from_name('C', 'major').noteset
-    right = Scale.from_name('A', 'minor').noteset
-    assert ComparedNoteSets(left, right).shared_notes == frozenset(left.notes)
-
-    right = Scale.from_name('C', 'mixolydian').noteset
-    c = ComparedNoteSets(left, right)
-    assert c.new_notes == frozenset({Note('b')})
-    assert c.del_notes == frozenset({Note('B')})
diff --git a/tests/svg/repr_svg_test.py b/tests/svg/repr_svg_test.py
index c1c0f844..df58f60a 100644
--- a/tests/svg/repr_svg_test.py
+++ b/tests/svg/repr_svg_test.py
@@ -3,7 +3,6 @@
 import pytest
 from colortool import Color
 from musiclib import config
-from musiclib.noteset import ComparedNoteSets
 from musiclib.noteset import NoteSet
 from musiclib.noteset import SpecificNoteSet
 from musiclib.scale import Scale
@@ -95,26 +94,6 @@ def test_svg_scale(kind, svg_method, title, subtitle, title_href, background_col
         svg_helper(svg, class_, title, subtitle, title_href, background_color)
 
 
-@pytest.mark.parametrize(
-    ('scale0', 'scale1'), [
-        (Scale.from_name('C', 'major'), Scale.from_name('f', 'phrygian')),
-        (Scale.from_name('A', 'major'), Scale.from_name('f', 'phrygian')),
-    ],
-)
-@pytest.mark.parametrize('svg_method', ['svg_piano', 'svg_plane_piano'])
-@pytest.mark.parametrize('title', [None, TITLE])
-@pytest.mark.parametrize('subtitle', [None, SUBTITLE])
-@pytest.mark.parametrize('title_href', [None, TITLE_HREF])
-@pytest.mark.parametrize('background_color', [BACKGROUND_COLOR])
-def test_svg_compared_notesets(scale0, scale1, svg_method, title, subtitle, title_href, background_color):
-    if title is None and title_href is not None:
-        pytest.skip('title_href requires title')
-    class_ = ('cls1', 'cls2')
-    kw = kw_helper(class_, title, subtitle, title_href, background_color, svg_method)
-    svg = str(getattr(ComparedNoteSets(scale0.noteset, scale1.noteset), svg_method)(**kw))
-    svg_helper(svg, class_, title, subtitle, title_href, background_color)
-
-
 @pytest.mark.parametrize(
     'sns', [
         SpecificNoteSet.from_str('C1_E1_f1'),