diff --git a/README.md b/README.md
index 7c1c54e..ac68f03 100644
--- a/README.md
+++ b/README.md
@@ -117,7 +117,6 @@ UX:
 - **Auto re-attach control** — keep it visible/controllable when not connected (today it can be
   enabled-but-invisible).
 - **Tooltips on disabled controls** — explain *why* Inject/subsystem controls are disabled.
-- **Case-insensitive log filter.**
 
 Code quality:
 - **Stale comments** — `hook_guard.hpp` top block (still the old destroy-on-remove model),
diff --git a/host/src/log_panel.cpp b/host/src/log_panel.cpp
index 996c0d2..62d1ac2 100644
--- a/host/src/log_panel.cpp
+++ b/host/src/log_panel.cpp
@@ -1,7 +1,10 @@
 #include "log_panel.hpp"
 
+#include <algorithm>
+#include <cctype>
 #include <cstdio>
 #include <cstring>
+#include <string>
 
 #include "imgui.h"
 
@@ -11,6 +14,24 @@
 namespace coop
 {
 
+namespace
+{
+// Case-insensitive substring test, so the log filter matches regardless of case (consistent with the
+// rest of the app, where "error" should find "ERROR").
+bool icontains(const std::string& hay, const char* needle)
+{
+	if (needle == nullptr || needle[0] == '\0')
+	{
+		return true;
+	}
+	auto lower = [](std::string s) {
+		std::transform(s.begin(), s.end(), s.begin(), [](unsigned char c) { return static_cast<char>(std::tolower(c)); });
+		return s;
+	};
+	return lower(hay).find(lower(needle)) != std::string::npos;
+}
+} // namespace
+
 void LogPanel::add_line(const LogRecord& rec)
 {
 	if (first_millis_ == 0)
@@ -55,7 +76,7 @@ void LogPanel::draw()
 		const bool has_filter = filter_[0] != '\0';
 		for (const Line& line : lines_)
 		{
-			if (has_filter && line.text.find(filter_) == std::string::npos)
+			if (has_filter && !icontains(line.text, filter_))
 			{
 				continue;
 			}