diff --git a/docs-users/fr/support/faq.md b/docs-users/fr/support/faq.md
index 1a6f7566..f9dcac7e 100644
--- a/docs-users/fr/support/faq.md
+++ b/docs-users/fr/support/faq.md
@@ -44,6 +44,10 @@ Sur macOS, utliser `Cmd` à la place de `Ctrl`.
 * `macolonne!=impair` → cible les éléments dont la colonne `macolonne` est absente ou dont la valeur est différente de `impair`
 * `macolonne>12` → cible les éléments dont la colonne `macolonne` est supérieur au nombre `12`
 * `macolonne<12.34` → cible les éléments dont la colonne `macolonne` est inférieure au nombre `12.34`
+* `macolonne=` → cible les éléments dont la colonne `macolonne` est vide
+* `macolonne!=` → cible les éléments dont la colonne `macolonne` n'est pas vide
+* `macolonne=true/false` → cible les éléments dont la colonne `macolonne` est explicitement `true` (ou `false`)
+* `macolonne!=true/false` → cible les éléments dont la colonne `macolonne` est différente de `true` (ou `false`)
 
 Quand la condition est vraie pour un élément donné, le style associé sera appliqué.
 
diff --git a/docs-users/support/faq.md b/docs-users/support/faq.md
index 416f8239..68bf59ca 100644
--- a/docs-users/support/faq.md
+++ b/docs-users/support/faq.md
@@ -44,6 +44,10 @@ With macOS, replace `Ctrl` by `Cmd`.
 * `mycolumn!=odd` → will match features whose column `mycolumn` is missing or different from `odd`
 * `mycolumn>12` → will match features whose column `mycolumn` is greater than `12` (as number)
 * `mycolumn<12.34` → will match features whose column `mycolumn` is lower than `12.34` (as number)
+* `mycolumn=` → will match features whose column `mycolumn` has no or null value
+* `mycolumn!=` → will match features whose column `mycolumn` has any defined
+* `mycolumn=true/false` → will match features whose column `mycolumn` is explicitely `true` (or `false`)
+* `mycolumn!=true/false` → will match features whose column `mycolumn` is different from `true` (or `false`)
 
 When the condition match, the associated style will be applied to the corresponding feature.
 
diff --git a/umap/static/umap/js/modules/rules.js b/umap/static/umap/js/modules/rules.js
index 0c945059..b584d0d8 100644
--- a/umap/static/umap/js/modules/rules.js
+++ b/umap/static/umap/js/modules/rules.js
@@ -3,6 +3,8 @@ import { translate } from './i18n.js'
 import * as Utils from './utils.js'
 import { AutocompleteDatalist } from './autocomplete.js'
 
+const EMPTY_VALUES = ['', undefined, null]
+
 class Rule {
   get condition() {
     return this._condition
@@ -75,13 +77,22 @@ class Rule {
     if (vars.length !== 2) return
     this.key = vars[0]
     this.expected = vars[1]
+    if (EMPTY_VALUES.includes(this.expected)) {
+      this.cast = (v) => EMPTY_VALUES.includes(v)
+    }
     // Special cases where we want to be lousy when checking isNaN without
     // coercing to a Number first because we handle multiple types.
     // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/
     // Reference/Global_Objects/Number/isNaN
     // biome-ignore lint/suspicious/noGlobalIsNan: expected might not be a number.
-    if (!isNaN(this.expected)) this.cast = Number.parseFloat
-    else if (['true', 'false'].includes(this.expected)) this.cast = (v) => !!v
+    else if (!isNaN(this.expected)) {
+      this.cast = Number.parseFloat
+    } else if (['true', 'false'].includes(this.expected)) {
+      this.cast = (v) => {
+        if (`${v}`.toLowerCase() === 'true') return true
+        if (`${v}`.toLowerCase() === 'false') return false
+      }
+    }
     this.expected = this.cast(this.expected)
   }
 
@@ -133,7 +144,9 @@ class Rule {
         autocomplete.suggestions = [`${value}=`, `${value}!=`, `${value}>`, `${value}<`]
       } else if (value.endsWith('=')) {
         const key = value.split('!')[0].split('=')[0]
-        autocomplete.suggestions = this.map.sortedValues(key).map((str) => `${value}${str || ''}`)
+        autocomplete.suggestions = this.map
+          .sortedValues(key)
+          .map((str) => `${value}${str || ''}`)
       }
     })
     this.map.editPanel.open({ content: container })
diff --git a/umap/tests/integration/test_conditional_rules.py b/umap/tests/integration/test_conditional_rules.py
index 3db4b5b4..92c64702 100644
--- a/umap/tests/integration/test_conditional_rules.py
+++ b/umap/tests/integration/test_conditional_rules.py
@@ -24,6 +24,7 @@ DATALAYER_DATA1 = {
                 "mynumber": 10,
                 "myboolean": True,
                 "mydate": "2024/04/14 12:19:17",
+                "maybeempty": "not empty",
             },
             "geometry": {"type": "Point", "coordinates": [0.065918, 48.385442]},
         },
@@ -35,6 +36,7 @@ DATALAYER_DATA1 = {
                 "mynumber": 12,
                 "myboolean": False,
                 "mydate": "2024/03/13 12:20:20",
+                "maybeempty": "",
             },
             "geometry": {"type": "Point", "coordinates": [3.55957, 49.767074]},
         },
@@ -56,6 +58,7 @@ DATALAYER_DATA2 = {
                 "mynumber": 10,
                 "myboolean": "true",
                 "mydate": "2024/08/18 13:14:15",
+                "maybeempty": None,
             },
             "geometry": {"type": "Point", "coordinates": [0.856934, 45.290347]},
         },
@@ -69,6 +72,18 @@ DATALAYER_DATA2 = {
             },
             "geometry": {"type": "Point", "coordinates": [4.372559, 47.945786]},
         },
+        {
+            "type": "Feature",
+            "properties": {
+                "mytype": "odd",
+                "name": "Point 5",
+                "mynumber": 10,
+                "mydate": "2024-04-14T10:19:17.000Z",
+                "myboolean": "notaboolean",
+                "maybeempty": "foo",
+            },
+            "geometry": {"type": "Point", "coordinates": [4.1, 47.3]},
+        },
     ],
     "_umap_options": {
         "name": "Calque 2",
@@ -85,9 +100,9 @@ def test_simple_equal_rule_at_load(live_server, page, map):
     DataLayerFactory(map=map, data=DATALAYER_DATA2)
     page.goto(f"{live_server.url}{map.get_absolute_url()}#6/48.948/1.670")
     markers = page.locator(".leaflet-marker-icon .icon_container")
-    expect(markers).to_have_count(4)
+    expect(markers).to_have_count(5)
     colors = getColors(markers)
-    assert colors.count("rgb(240, 248, 255)") == 2
+    assert colors.count("rgb(240, 248, 255)") == 3
 
 
 def test_simple_not_equal_rule_at_load(live_server, page, map):
@@ -99,9 +114,9 @@ def test_simple_not_equal_rule_at_load(live_server, page, map):
     DataLayerFactory(map=map, data=DATALAYER_DATA2)
     page.goto(f"{live_server.url}{map.get_absolute_url()}#6/48.948/1.670")
     markers = page.locator(".leaflet-marker-icon .icon_container")
-    expect(markers).to_have_count(4)
+    expect(markers).to_have_count(5)
     colors = getColors(markers)
-    assert colors.count("rgb(240, 248, 255)") == 2
+    assert colors.count("rgb(240, 248, 255)") == 3
 
 
 def test_gt_rule_with_number_at_load(live_server, page, map):
@@ -113,7 +128,7 @@ def test_gt_rule_with_number_at_load(live_server, page, map):
     DataLayerFactory(map=map, data=DATALAYER_DATA2)
     page.goto(f"{live_server.url}{map.get_absolute_url()}#6/48.948/1.670")
     markers = page.locator(".leaflet-marker-icon .icon_container")
-    expect(markers).to_have_count(4)
+    expect(markers).to_have_count(5)
     colors = getColors(markers)
     assert colors.count("rgb(240, 248, 255)") == 2
 
@@ -127,9 +142,9 @@ def test_lt_rule_with_number_at_load(live_server, page, map):
     DataLayerFactory(map=map, data=DATALAYER_DATA2)
     page.goto(f"{live_server.url}{map.get_absolute_url()}#6/48.948/1.670")
     markers = page.locator(".leaflet-marker-icon .icon_container")
-    expect(markers).to_have_count(4)
+    expect(markers).to_have_count(5)
     colors = getColors(markers)
-    assert colors.count("rgb(240, 248, 255)") == 3
+    assert colors.count("rgb(240, 248, 255)") == 4
 
 
 def test_lt_rule_with_float_at_load(live_server, page, map):
@@ -141,9 +156,9 @@ def test_lt_rule_with_float_at_load(live_server, page, map):
     DataLayerFactory(map=map, data=DATALAYER_DATA2)
     page.goto(f"{live_server.url}{map.get_absolute_url()}#6/48.948/1.670")
     markers = page.locator(".leaflet-marker-icon .icon_container")
-    expect(markers).to_have_count(4)
+    expect(markers).to_have_count(5)
     colors = getColors(markers)
-    assert colors.count("rgb(240, 248, 255)") == 3
+    assert colors.count("rgb(240, 248, 255)") == 4
 
 
 def test_equal_rule_with_boolean_at_load(live_server, page, map):
@@ -155,7 +170,77 @@ def test_equal_rule_with_boolean_at_load(live_server, page, map):
     DataLayerFactory(map=map, data=DATALAYER_DATA2)
     page.goto(f"{live_server.url}{map.get_absolute_url()}#6/48.948/1.670")
     markers = page.locator(".leaflet-marker-icon .icon_container")
-    expect(markers).to_have_count(4)
+    expect(markers).to_have_count(5)
+    colors = getColors(markers)
+    assert colors.count("rgb(240, 248, 255)") == 2
+
+
+def test_equal_rule_with_boolean_not_true_at_load(live_server, page, map):
+    map.settings["properties"]["rules"] = [
+        {"condition": "myboolean!=true", "options": {"color": "aliceblue"}}
+    ]
+    map.save()
+    DataLayerFactory(map=map, data=DATALAYER_DATA1)
+    DataLayerFactory(map=map, data=DATALAYER_DATA2)
+    page.goto(f"{live_server.url}{map.get_absolute_url()}#6/48.948/1.670")
+    markers = page.locator(".leaflet-marker-icon .icon_container")
+    expect(markers).to_have_count(5)
+    colors = getColors(markers)
+    assert colors.count("rgb(240, 248, 255)") == 3
+
+
+def test_equal_rule_with_boolean_false_at_load(live_server, page, map):
+    map.settings["properties"]["rules"] = [
+        {"condition": "myboolean=false", "options": {"color": "aliceblue"}}
+    ]
+    map.save()
+    DataLayerFactory(map=map, data=DATALAYER_DATA1)
+    DataLayerFactory(map=map, data=DATALAYER_DATA2)
+    page.goto(f"{live_server.url}{map.get_absolute_url()}#6/48.948/1.670")
+    markers = page.locator(".leaflet-marker-icon .icon_container")
+    expect(markers).to_have_count(5)
+    colors = getColors(markers)
+    assert colors.count("rgb(240, 248, 255)") == 1
+
+
+def test_equal_rule_with_boolean_not_false_at_load(live_server, page, map):
+    map.settings["properties"]["rules"] = [
+        {"condition": "myboolean!=false", "options": {"color": "aliceblue"}}
+    ]
+    map.save()
+    DataLayerFactory(map=map, data=DATALAYER_DATA1)
+    DataLayerFactory(map=map, data=DATALAYER_DATA2)
+    page.goto(f"{live_server.url}{map.get_absolute_url()}#6/48.948/1.670")
+    markers = page.locator(".leaflet-marker-icon .icon_container")
+    expect(markers).to_have_count(5)
+    colors = getColors(markers)
+    assert colors.count("rgb(240, 248, 255)") == 4
+
+
+def test_empty_rule_at_load(live_server, page, map):
+    map.settings["properties"]["rules"] = [
+        {"condition": "maybeempty=", "options": {"color": "aliceblue"}}
+    ]
+    map.save()
+    DataLayerFactory(map=map, data=DATALAYER_DATA1)
+    DataLayerFactory(map=map, data=DATALAYER_DATA2)
+    page.goto(f"{live_server.url}{map.get_absolute_url()}#6/48.948/1.670")
+    markers = page.locator(".leaflet-marker-icon .icon_container")
+    expect(markers).to_have_count(5)
+    colors = getColors(markers)
+    assert colors.count("rgb(240, 248, 255)") == 3
+
+
+def test_not_empty_rule_at_load(live_server, page, map):
+    map.settings["properties"]["rules"] = [
+        {"condition": "maybeempty!=", "options": {"color": "aliceblue"}}
+    ]
+    map.save()
+    DataLayerFactory(map=map, data=DATALAYER_DATA1)
+    DataLayerFactory(map=map, data=DATALAYER_DATA2)
+    page.goto(f"{live_server.url}{map.get_absolute_url()}#6/48.948/1.670")
+    markers = page.locator(".leaflet-marker-icon .icon_container")
+    expect(markers).to_have_count(5)
     colors = getColors(markers)
     assert colors.count("rgb(240, 248, 255)") == 2
 
@@ -165,7 +250,7 @@ def test_can_create_new_rule(live_server, page, openmap):
     DataLayerFactory(map=openmap, data=DATALAYER_DATA2)
     page.goto(f"{live_server.url}{openmap.get_absolute_url()}#6/48.948/1.670")
     markers = page.locator(".leaflet-marker-icon .icon_container")
-    expect(markers).to_have_count(4)
+    expect(markers).to_have_count(5)
     page.get_by_role("button", name="Edit").click()
     page.get_by_role("link", name="Map advanced properties").click()
     page.get_by_text("Conditional style rules").click()
@@ -175,7 +260,7 @@ def test_can_create_new_rule(live_server, page, openmap):
     page.locator(".umap-field-color .define").first.click()
     page.get_by_title("AliceBlue").first.click()
     colors = getColors(markers)
-    assert colors.count("rgb(240, 248, 255)") == 2
+    assert colors.count("rgb(240, 248, 255)") == 3
 
 
 def test_can_deactive_rule_from_list(live_server, page, openmap):
@@ -187,9 +272,9 @@ def test_can_deactive_rule_from_list(live_server, page, openmap):
     DataLayerFactory(map=openmap, data=DATALAYER_DATA2)
     page.goto(f"{live_server.url}{openmap.get_absolute_url()}#6/48.948/1.670")
     markers = page.locator(".leaflet-marker-icon .icon_container")
-    expect(markers).to_have_count(4)
+    expect(markers).to_have_count(5)
     colors = getColors(markers)
-    assert colors.count("rgb(240, 248, 255)") == 2
+    assert colors.count("rgb(240, 248, 255)") == 3
     page.get_by_role("button", name="Edit").click()
     page.get_by_role("link", name="Map advanced properties").click()
     page.get_by_text("Conditional style rules").click()
@@ -198,7 +283,7 @@ def test_can_deactive_rule_from_list(live_server, page, openmap):
     assert colors.count("rgb(240, 248, 255)") == 0
     page.get_by_role("button", name="Show/hide layer").click()
     colors = getColors(markers)
-    assert colors.count("rgb(240, 248, 255)") == 2
+    assert colors.count("rgb(240, 248, 255)") == 3
 
 
 def test_autocomplete_datalist(live_server, page, openmap):
@@ -209,9 +294,9 @@ def test_autocomplete_datalist(live_server, page, openmap):
     page.get_by_role("button", name="Add rule").click()
     panel = page.locator(".panel.right.on")
     datalist = panel.locator(".umap-field-condition datalist option")
-    expect(datalist).to_have_count(5)
+    expect(datalist).to_have_count(6)
     values = {option.inner_text() for option in datalist.all()}
-    assert values == {"myboolean", "mytype", "mynumber", "mydate", "name"}
+    assert values == {"myboolean", "mytype", "mynumber", "mydate", "name", "maybeempty"}
     page.get_by_placeholder("key=value or key!=value").fill("mytype")
     expect(datalist).to_have_count(4)
     values = {option.inner_text() for option in datalist.all()}