try OpenStreetMap Dark

lib/screens/channel_message_path_screen.dart

@@ -561,6 +561,7 @@ class _ChannelMessagePathMapScreenState
                     TileLayer(
                       urlTemplate: tileCache.urlTemplate,
                       tileProvider: tileCache.tileProvider,
+                      tileBuilder: tileCache.tileBuilder,
                       userAgentPackageName:
                           MapTileCacheService.userAgentPackageName,
                       maxZoom: 19,

lib/screens/line_of_sight_map_screen.dart

@@ -472,6 +472,7 @@ class _LineOfSightMapScreenState extends State<LineOfSightMapScreen> {
               TileLayer(
                 urlTemplate: tileCache.urlTemplate,
                 tileProvider: tileCache.tileProvider,
+                tileBuilder: tileCache.tileBuilder,
                 userAgentPackageName: MapTileCacheService.userAgentPackageName,
                 maxZoom: 19,
               ),

lib/screens/map_cache_screen.dart

@@ -398,6 +398,7 @@ class _MapCacheScreenState extends State<MapCacheScreen> {
                     TileLayer(
                       urlTemplate: tileCache.urlTemplate,
                       tileProvider: tileCache.tileProvider,
+                      tileBuilder: tileCache.tileBuilder,
                       userAgentPackageName:
                           MapTileCacheService.userAgentPackageName,
                       maxZoom: 19,

lib/screens/map_screen.dart

@@ -565,6 +565,7 @@ class _MapScreenState extends State<MapScreen> {
                     TileLayer(
                       urlTemplate: tileCache.urlTemplate,
                       tileProvider: tileCache.tileProvider,
+                      tileBuilder: tileCache.tileBuilder,
                       userAgentPackageName:
                           MapTileCacheService.userAgentPackageName,
                       maxZoom: 19,

lib/screens/path_trace_map.dart

@@ -911,6 +911,7 @@ class _PathTraceMapScreenState extends State<PathTraceMapScreen> {
         TileLayer(
           urlTemplate: tileCache.urlTemplate,
           tileProvider: tileCache.tileProvider,
+          tileBuilder: tileCache.tileBuilder,
           userAgentPackageName: MapTileCacheService.userAgentPackageName,
           maxZoom: 19,
         ),

lib/services/map_tile_cache_service.dart

@@ -10,6 +10,7 @@ import 'app_settings_service.dart';
 
 enum MapRasterSourcePreset {
   osmStandard('osm_standard'),
+  osmDark('osm_dark'),
   stamenTerrain('stamen_terrain'),
   alidadeSmoothDark('alidade_smooth_dark'),
   outdoors('outdoors'),
@@ -86,6 +87,11 @@ class MapRasterSourceCatalog {
         label: 'OpenStreetMap Standard',
         description: 'Direct tiles from tile.openstreetmap.org',
       );
+  static const MapRasterSourceDefinition osmDark = MapRasterSourceDefinition(
+    id: 'osm_dark',
+    label: 'OpenStreetMap Dark',
+    description: 'Standard OpenStreetMap tiles with an inverted dark filter',
+  );
   static const MapRasterSourceDefinition stamenTerrain =
       MapRasterSourceDefinition(
         id: 'stamen_terrain',
@@ -119,6 +125,7 @@ class MapRasterSourceCatalog {
 
   static const List<MapRasterSourceDefinition> presets = [
     osmStandard,
+    osmDark,
     stamenTerrain,
     alidadeSmoothDark,
     outdoors,
@@ -130,6 +137,8 @@ class MapRasterSourceCatalog {
     switch (preset) {
       case MapRasterSourcePreset.osmStandard:
         return osmStandard;
+      case MapRasterSourcePreset.osmDark:
+        return osmDark;
       case MapRasterSourcePreset.alidadeSmoothDark:
         return alidadeSmoothDark;
       case MapRasterSourcePreset.outdoors:
@@ -279,6 +288,13 @@ class MapTileCacheService extends ChangeNotifier {
 
   String get urlTemplate => _buildUrlTemplate(appSettingsService.settings);
 
+  TileBuilder? get tileBuilder => isInvertedOsmDarkSource
+      ? _osmDarkTileBuilder
+      : null;
+
+  bool get isInvertedOsmDarkSource =>
+      source.id == MapRasterSourceCatalog.osmDark.id;
+
   CacheManager get _concreteCacheManager => cacheManager as CacheManager;
 
   Map<String, String> get defaultHeaders => {
@@ -622,6 +638,30 @@ class MapTileCacheService extends ChangeNotifier {
   }
 }
 
+Widget _osmDarkTileBuilder(
+  BuildContext _,
+  Widget tileWidget,
+  TileImage __,
+) {
+  return ColorFiltered(
+    colorFilter: const ColorFilter.matrix(<double>[
+      1.33, 0, 0, 0, 0,
+      0, 1.33, 0, 0, 0,
+      0, 0, 1.33, 0, 0,
+      0, 0, 0, 1, 0,
+    ]),
+    child: ColorFiltered(
+      colorFilter: const ColorFilter.matrix(<double>[
+        0.5740000009536743, -1.4299999475479126, -0.14399999380111694, 0, 255,
+        -0.4259999990463257, -0.429999977350235, -0.14399999380111694, 0, 255,
+        -0.4259999990463257, -1.4299999475479126, 0.8559999465942383, 0, 255,
+        0, 0, 0, 1, 0,
+      ]),
+      child: tileWidget,
+    ),
+  );
+}
+
 class CachedNetworkTileProvider extends TileProvider {
   final BaseCacheManager cacheManager;