diff --git a/tk-comm b/tk-comm
new file mode 100755
index 0000000..62b31f8
--- /dev/null
+++ b/tk-comm
@@ -0,0 +1,185 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings FATAL => 'all';
+
+use Tk;
+use IO::File;
+use List::Compare;
+require Tk::ROText;
+
+my ( $filename_A, $filename_B ) = ( '', '' );
+
+my $mw = MainWindow->new;
+$mw->title( 'Compare Files' );
+
+add_choose_file_frame( 'File A', \$filename_A );
+add_choose_file_frame( 'File B', \$filename_B );
+
+my $button_frame = $mw->Frame->pack;
+$button_frame->Button( -text => "File A only", -command => \&file_A_only )->pack( -side => 'left' );
+$button_frame->Button( -text => "File B only", -command => \&file_B_only )->pack( -side => 'left' );
+$button_frame->Button( -text => "Both files",  -command => \&both_files  )->pack( -side => 'left' ) ;
+$button_frame->Button( -text => "Quit",        -command => sub { $mw->destroy } )->pack;
+
+MainLoop;
+
+sub add_choose_file_frame {
+    my ( $label, $var_ref ) = @_;
+
+    my $frame = $mw->Frame->pack( -side => 'top', -fill => 'x' );
+    $frame->Label( -text => $label )->pack( -side => 'left' );
+    $frame->Entry( -width => 30, -textvariable => $var_ref )->pack( -side => 'left' );
+    $frame->Button( -text => 'Browse', -command => choose_file( $var_ref ) )->pack;
+}
+
+sub choose_file {
+    my $var_ref = shift;
+
+    my @types = (
+        ['All Files',                 '*',             ],
+        ['Text Files',                ['.txt', '.text']],
+    );
+    
+    return sub {
+        ${$var_ref} = $mw->getOpenFile( -filetypes => \@types );
+   };
+}
+
+sub file_A_only {
+    my $lc = compare_files()
+        or return;
+    show_results( 'File A only', $lc->get_unique_ref );
+}
+
+sub file_B_only {
+    my $lc = compare_files()
+        or return;
+    show_results( 'File B only', $lc->get_complement_ref );
+}
+
+sub both_files {
+    my $lc = compare_files()
+        or return;
+    show_results( 'Both files', $lc->get_intersection_ref );
+}
+
+sub show_results {
+    my ( $title, $results ) = @_;
+
+    my $results_window = $mw->Toplevel( -title => $title );
+    my $text = $results_window->Scrolled( 'ROText', -wrap => 'none', -scrollbars => 'osoe' )->pack;
+    $text->insert( 'end', join "\n", @{$results} );
+
+    $results_window->Button(
+        -text    => 'Close',
+        -command => sub { $results_window->destroy }
+    )->pack( -side => 'right' );
+    
+    $results_window->Button(
+        -text    => 'Save',
+        -command => sub { save_results( $results_window, $results ) && $results_window->destroy }
+    )->pack( -side => 'right' );
+}
+
+sub save_results {
+    my ( $rw, $results ) = @_;
+
+    my $filename = $rw->getSaveFile();
+    unless ( defined $filename and length $filename ) {
+        popup_error( "You must specify a file for the results to be saved" );
+        return;
+    }
+    
+    my $fh = IO::File->new( $filename, O_RDWR|O_CREAT|O_TRUNC, 0644 );
+    unless ( $fh ) {
+        popup_error( "Failed to open $filename for writing: $!" );
+        return;
+    }
+
+    for my $r ( @{$results} ) {
+        $fh->print( "$r\n" );
+    }
+    
+    $fh->close;
+
+    $rw->messageBox( -title => 'Saved', -message => "Results saved to $filename", -type => 'ok' );
+
+    return 1;
+}
+
+sub compare_files {
+    my ( $A, $B ) = read_files()
+        or return;
+
+    return List::Compare->new( $A, $B );
+}
+
+sub read_files {
+
+    unless ( defined $filename_A and length $filename_A ) {
+        popup_error( "File A must be specified" );
+        return;
+    }
+
+    unless ( defined $filename_B and length $filename_B ) {
+        popup_error( "File B must be specified" );
+        return;
+    }
+    
+    my $content_A = slurp_lines( $filename_A )
+        or return;
+
+    my $content_B = slurp_lines( $filename_B )
+        or return;
+
+    return ( $content_A, $content_B );
+}
+
+sub slurp_lines {
+    my $filename = shift;
+
+    my $fh = IO::File->new( $filename, O_RDONLY );
+    unless ( $fh ) {
+        popup_error( "Failed to open $filename: $!" );
+        return;
+    }
+
+    local $/ = undef;
+
+    my $content = <$fh>;
+
+    [ split qr/\r\n|\r|\n/, $content ];
+}
+
+sub popup_error {
+    my $error = shift;
+    $mw->messageBox( -title => 'Error', -message => $error, -type => 'ok' );
+}
+
+__END__
+
+=head1 NAME
+
+tk-comm
+
+=head1 DESCRIPTION
+
+B<tk-comm> is a graphical version of the standard Unix L<comm(1)>
+command. Unlike L<comm(1)>, it does not require files to be sorted,
+and it handles Unix, Windows, and Mac line endings transparently.
+
+=head1 SEE ALSO
+
+L<comm(1)>, L<List::Compare>
+
+=head1 AUTHOR
+
+Ray Miller E<lt>ray@1729.org.ukE<gt>
+
+=head1 COPYRIGHT AND LICENSE
+
+Copyright (c) 2012 Ray Miller.
+
+This is free software; you can redistribute it and/or modify it under
+the same terms as the Perl 5 programming language system itself.