diff --git a/apps/monitor/src/query.rs b/apps/monitor/src/query.rs
index 3801883..13a1520 100644
--- a/apps/monitor/src/query.rs
+++ b/apps/monitor/src/query.rs
@@ -50,6 +50,17 @@ pub struct Response {
 pub fn evaluate(query: &Value, response: &Response) -> Result<bool> {
     match query {
         Value::Object(map) => {
+            // $consider — "up" (default) or "down": flips result if conditions match
+            if let Some(consider) = map.get("$consider") {
+                let is_down = consider.as_str() == Some("down");
+                let rest: serde_json::Map<String, Value> = map.iter()
+                    .filter(|(k, _)| k.as_str() != "$consider")
+                    .map(|(k, v)| (k.clone(), v.clone()))
+                    .collect();
+                let matches = evaluate(&Value::Object(rest), response).unwrap_or(false);
+                return Ok(if is_down { !matches } else { matches });
+            }
+
             // $and / $or / $not
             if let Some(and) = map.get("$and") {
                 let Value::Array(clauses) = and else { bail!("$and expects array") };
diff --git a/apps/web/src/dashboard/query-builder.js b/apps/web/src/dashboard/query-builder.js
index 7691581..28de061 100644
--- a/apps/web/src/dashboard/query-builder.js
+++ b/apps/web/src/dashboard/query-builder.js
@@ -21,6 +21,7 @@ class QueryBuilder {
     this.container = container;
     this.onChange = onChange;
     this.logic = '$and';
+    this.consider = 'up'; // 'up' | 'down'
     this.rules = [this._emptyRule()];
     this.render();
   }
@@ -34,8 +35,9 @@ class QueryBuilder {
       .map(r => this._ruleToQuery(r))
       .filter(Boolean);
     if (conditions.length === 0) return null;
-    if (conditions.length === 1) return conditions[0];
-    return { [this.logic]: conditions };
+    const base = conditions.length === 1 ? conditions[0] : { [this.logic]: conditions };
+    if (this.consider === 'down') return { $consider: 'down', ...base };
+    return base;
   }
 
   _ruleToQuery(rule) {
@@ -86,18 +88,23 @@ class QueryBuilder {
     if (!query || typeof query !== 'object') {
       this.rules = [this._emptyRule()];
       this.logic = '$and';
+      this.consider = 'up';
       this.render();
       return;
     }
 
-    if ('$and' in query || '$or' in query) {
-      this.logic = '$and' in query ? '$and' : '$or';
-      const clauses = query[this.logic];
+    // Strip $consider before parsing rules
+    this.consider = query.$consider === 'down' ? 'down' : 'up';
+    const q = Object.fromEntries(Object.entries(query).filter(([k]) => k !== '$consider'));
+
+    if ('$and' in q || '$or' in q) {
+      this.logic = '$and' in q ? '$and' : '$or';
+      const clauses = q[this.logic];
       if (Array.isArray(clauses)) {
         this.rules = clauses.map(c => this._queryToRule(c)).filter(Boolean);
       }
     } else {
-      this.rules = [this._queryToRule(query)].filter(Boolean);
+      this.rules = [this._queryToRule(q)].filter(Boolean);
     }
 
     if (this.rules.length === 0) this.rules = [this._emptyRule()];
@@ -164,13 +171,18 @@ class QueryBuilder {
 
     this.container.innerHTML = `
       <div class="space-y-3">
-        <div class="flex items-center gap-2 mb-4">
-          <span class="text-sm text-gray-400">Match</span>
+        <div class="flex items-center gap-2 mb-4 flex-wrap">
+          <span class="text-sm text-gray-400">Consider</span>
+          <select id="qb-consider" class="bg-gray-800 border border-gray-700 text-sm rounded px-2 py-1 focus:border-blue-500 focus:outline-none font-medium ${this.consider === 'down' ? 'text-red-400' : 'text-green-400'}">
+            <option value="up"   ${this.consider === 'up'   ? 'selected' : ''}>UP</option>
+            <option value="down" ${this.consider === 'down' ? 'selected' : ''}>DOWN</option>
+          </select>
+          <span class="text-sm text-gray-400">when</span>
           <select id="qb-logic" class="bg-gray-800 border border-gray-700 text-gray-200 text-sm rounded px-2 py-1 focus:border-blue-500 focus:outline-none">
             <option value="$and" ${this.logic === '$and' ? 'selected' : ''}>ALL</option>
             <option value="$or" ${this.logic === '$or' ? 'selected' : ''}>ANY</option>
           </select>
-          <span class="text-sm text-gray-400">of the following conditions</span>
+          <span class="text-sm text-gray-400">of the following match</span>
         </div>
 
         <div id="qb-rules" class="space-y-2">
@@ -190,6 +202,12 @@ class QueryBuilder {
     `;
 
     // Bind events
+    this.container.querySelector('#qb-consider').addEventListener('change', (e) => {
+      this.consider = e.target.value;
+      this.render();
+      this.onChange?.(this.getQuery());
+    });
+
     this.container.querySelector('#qb-logic').addEventListener('change', (e) => {
       this.logic = e.target.value;
       this.render();
diff --git a/apps/web/src/query/index.ts b/apps/web/src/query/index.ts
index 70c1bd4..ffd49db 100644
--- a/apps/web/src/query/index.ts
+++ b/apps/web/src/query/index.ts
@@ -86,6 +86,14 @@ export function evaluate(query: unknown, ctx: EvalContext): boolean {
 
   const q = query as Record<string, unknown>;
 
+  // $consider — "up" (default) or "down": flips result if conditions match
+  if ("$consider" in q) {
+    const consider = q.$consider as string;
+    const rest = Object.fromEntries(Object.entries(q).filter(([k]) => k !== "$consider"));
+    const matches = evaluate(rest, ctx);
+    return consider === "down" ? !matches : matches;
+  }
+
   // $and
   if ("$and" in q) {
     const clauses = q.$and;