diff --git a/addons/ofxEmscripten/src/ofxAppEmscriptenWindow.cpp b/addons/ofxEmscripten/src/ofxAppEmscriptenWindow.cpp
index be3f9d663cf..d67de5826c2 100644
--- a/addons/ofxEmscripten/src/ofxAppEmscriptenWindow.cpp
+++ b/addons/ofxEmscripten/src/ofxAppEmscriptenWindow.cpp
@@ -10,6 +10,10 @@
 #include "ofEvents.h"
 #include "ofGLProgrammableRenderer.h"
 
+#ifndef OF_WEBGL_VERSION
+#define OF_WEBGL_VERSION 2
+#endif
+
 using namespace std;
 
 ofxAppEmscriptenWindow * ofxAppEmscriptenWindow::instance = NULL;
@@ -38,7 +42,7 @@ void ofxAppEmscriptenWindow::setup(const ofGLESWindowSettings & settings){
 	attrs.depth = 1;
 	attrs.stencil = 1;
 	attrs.antialias = 1;
-	attrs.majorVersion = 2;
+	attrs.majorVersion = OF_WEBGL_VERSION;
 	attrs.minorVersion = 0;
 	attrs.alpha = 0;
 
diff --git a/addons/ofxiOS/src/ofxiOSConstants.h b/addons/ofxiOS/src/ofxiOSConstants.h
index 516c04519be..7f81073f79b 100644
--- a/addons/ofxiOS/src/ofxiOSConstants.h
+++ b/addons/ofxiOS/src/ofxiOSConstants.h
@@ -68,6 +68,11 @@ enum ofxiOSRendererType {
     OFXIOS_RENDERER_METAL = 4
 };
 
+// OF_GLES_VERSION=1|2|3 in the project defines to override or in projectGenerator from 0.99.0
+#ifndef OF_GLES_VERSION
+#define OF_GLES_VERSION OFXIOS_RENDERER_ES2
+#endif
+
 enum ofxiOSWindowControllerType{
     CORE_ANIMATION = 1,
     GL_KIT = 2,
diff --git a/libs/openFrameworksCompiled/project/emscripten/config.emscripten.default.mk b/libs/openFrameworksCompiled/project/emscripten/config.emscripten.default.mk
index 1c633c942da..9cda101fb32 100644
--- a/libs/openFrameworksCompiled/project/emscripten/config.emscripten.default.mk
+++ b/libs/openFrameworksCompiled/project/emscripten/config.emscripten.default.mk
@@ -124,7 +124,12 @@ ifneq ($(strip $(wildcard bin/data/*)),)
 	PLATFORM_LDFLAGS += --preload-file bin/data@data
 endif
 PLATFORM_LDFLAGS += --use-port=emdawnwebgpu
+# PROJECT_DEFINES += OF_WEBGL_VERSION=1 in config.make for a WebGL 1 only build (default WebGL 2)
+ifneq ($(filter OF_WEBGL_VERSION=1,$(PROJECT_DEFINES)),)
+PLATFORM_LDFLAGS += -s MAX_WEBGL_VERSION=1 -s FULL_ES2
+else
 PLATFORM_LDFLAGS += -s MAX_WEBGL_VERSION=2 -s WEBGL2_BACKWARDS_COMPATIBILITY_EMULATION=1 -s FULL_ES3
+endif
 PLATFORM_LDFLAGS += -s AUTO_NATIVE_LIBRARIES=1
 PLATFORM_LDFLAGS += -s AUTO_JS_LIBRARIES=1
 
diff --git a/scripts/templates/ios/src/main.mm b/scripts/templates/ios/src/main.mm
index 4aa96717b78..b4d84d3eb4b 100644
--- a/scripts/templates/ios/src/main.mm
+++ b/scripts/templates/ios/src/main.mm
@@ -1,5 +1,9 @@
 #include "ofApp.h"
 
+#ifndef OF_GLES_VERSION
+#define OF_GLES_VERSION OFXIOS_RENDERER_ES2
+#endif
+
 int main() {
 
     //  here are the most commonly used iOS window settings.
@@ -11,7 +15,7 @@ int main() {
     settings.numOfAntiAliasingSamples = 0; // number of samples used for anti-aliasing.
     settings.enableHardwareOrientation = false; // enables native view orientation.
     settings.enableHardwareOrientationAnimation = false; // enables native orientation changes to be animated.
-    settings.glesVersion = OFXIOS_RENDERER_ES2; // type of renderer to use, ES1, ES2, ES3
+    settings.glesVersion = OF_GLES_VERSION; // type of renderer to use, ES1, ES2, ES3 - default ES2, set via OF_GLES_VERSION define
     settings.windowControllerType = ofxiOSWindowControllerType::GL_KIT; // Window Controller Type
     settings.colorType = ofxiOSRendererColorFormat::RGBA8888; // color format used default RGBA8888
     settings.depthType = ofxiOSRendererDepthFormat::DEPTH_NONE; // depth format (16/24) if depth enabled
diff --git a/scripts/templates/linux/src/main.cpp b/scripts/templates/linux/src/main.cpp
index 4e6518d49dc..9b9203fcad7 100644
--- a/scripts/templates/linux/src/main.cpp
+++ b/scripts/templates/linux/src/main.cpp
@@ -9,6 +9,10 @@ int main( ){
 	settings.setSize(1024, 768);
 	settings.windowMode = OF_WINDOW; //can also be OF_FULLSCREEN
 
+#if defined(OF_GL_VERSION_MAJOR) && defined(OF_GL_VERSION_MINOR)
+	settings.setGLVersion(OF_GL_VERSION_MAJOR, OF_GL_VERSION_MINOR); // set via projectGenerator OpenGL version
+#endif
+
 	auto window = ofCreateWindow(settings);
 
 	ofRunApp(window, std::make_shared<ofApp>());
diff --git a/scripts/templates/linux64/src/main.cpp b/scripts/templates/linux64/src/main.cpp
index 4e6518d49dc..9b9203fcad7 100644
--- a/scripts/templates/linux64/src/main.cpp
+++ b/scripts/templates/linux64/src/main.cpp
@@ -9,6 +9,10 @@ int main( ){
 	settings.setSize(1024, 768);
 	settings.windowMode = OF_WINDOW; //can also be OF_FULLSCREEN
 
+#if defined(OF_GL_VERSION_MAJOR) && defined(OF_GL_VERSION_MINOR)
+	settings.setGLVersion(OF_GL_VERSION_MAJOR, OF_GL_VERSION_MINOR); // set via projectGenerator OpenGL version
+#endif
+
 	auto window = ofCreateWindow(settings);
 
 	ofRunApp(window, std::make_shared<ofApp>());
diff --git a/scripts/templates/linuxarmv6l/src/main.cpp b/scripts/templates/linuxarmv6l/src/main.cpp
index 4e6518d49dc..9b9203fcad7 100644
--- a/scripts/templates/linuxarmv6l/src/main.cpp
+++ b/scripts/templates/linuxarmv6l/src/main.cpp
@@ -9,6 +9,10 @@ int main( ){
 	settings.setSize(1024, 768);
 	settings.windowMode = OF_WINDOW; //can also be OF_FULLSCREEN
 
+#if defined(OF_GL_VERSION_MAJOR) && defined(OF_GL_VERSION_MINOR)
+	settings.setGLVersion(OF_GL_VERSION_MAJOR, OF_GL_VERSION_MINOR); // set via projectGenerator OpenGL version
+#endif
+
 	auto window = ofCreateWindow(settings);
 
 	ofRunApp(window, std::make_shared<ofApp>());
diff --git a/scripts/templates/linuxarmv7l/src/main.cpp b/scripts/templates/linuxarmv7l/src/main.cpp
index 4e6518d49dc..9b9203fcad7 100644
--- a/scripts/templates/linuxarmv7l/src/main.cpp
+++ b/scripts/templates/linuxarmv7l/src/main.cpp
@@ -9,6 +9,10 @@ int main( ){
 	settings.setSize(1024, 768);
 	settings.windowMode = OF_WINDOW; //can also be OF_FULLSCREEN
 
+#if defined(OF_GL_VERSION_MAJOR) && defined(OF_GL_VERSION_MINOR)
+	settings.setGLVersion(OF_GL_VERSION_MAJOR, OF_GL_VERSION_MINOR); // set via projectGenerator OpenGL version
+#endif
+
 	auto window = ofCreateWindow(settings);
 
 	ofRunApp(window, std::make_shared<ofApp>());
diff --git a/scripts/templates/msys2/src/main.cpp b/scripts/templates/msys2/src/main.cpp
index 4e6518d49dc..9b9203fcad7 100644
--- a/scripts/templates/msys2/src/main.cpp
+++ b/scripts/templates/msys2/src/main.cpp
@@ -9,6 +9,10 @@ int main( ){
 	settings.setSize(1024, 768);
 	settings.windowMode = OF_WINDOW; //can also be OF_FULLSCREEN
 
+#if defined(OF_GL_VERSION_MAJOR) && defined(OF_GL_VERSION_MINOR)
+	settings.setGLVersion(OF_GL_VERSION_MAJOR, OF_GL_VERSION_MINOR); // set via projectGenerator OpenGL version
+#endif
+
 	auto window = ofCreateWindow(settings);
 
 	ofRunApp(window, std::make_shared<ofApp>());
diff --git a/scripts/templates/osx/src/main.cpp b/scripts/templates/osx/src/main.cpp
index 4e6518d49dc..9b9203fcad7 100644
--- a/scripts/templates/osx/src/main.cpp
+++ b/scripts/templates/osx/src/main.cpp
@@ -9,6 +9,10 @@ int main( ){
 	settings.setSize(1024, 768);
 	settings.windowMode = OF_WINDOW; //can also be OF_FULLSCREEN
 
+#if defined(OF_GL_VERSION_MAJOR) && defined(OF_GL_VERSION_MINOR)
+	settings.setGLVersion(OF_GL_VERSION_MAJOR, OF_GL_VERSION_MINOR); // set via projectGenerator OpenGL version
+#endif
+
 	auto window = ofCreateWindow(settings);
 
 	ofRunApp(window, std::make_shared<ofApp>());
diff --git a/scripts/templates/tvOS/src/main.mm b/scripts/templates/tvOS/src/main.mm
index 7a44a4c64df..56c8bd89054 100644
--- a/scripts/templates/tvOS/src/main.mm
+++ b/scripts/templates/tvOS/src/main.mm
@@ -1,5 +1,9 @@
 #include "ofApp.h"
 
+#ifndef OF_GLES_VERSION
+#define OF_GLES_VERSION OFXIOS_RENDERER_ES2
+#endif
+
 int main() {
     
     //  here are the most commonly used iOS window settings.
@@ -11,7 +15,7 @@ int main() {
     settings.numOfAntiAliasingSamples = 0; // number of samples used for anti-aliasing.
     settings.enableHardwareOrientation = false; // enables native view orientation.
     settings.enableHardwareOrientationAnimation = false; // enables native orientation changes to be animated.
-    settings.glesVersion = OFXIOS_RENDERER_ES2; // type of renderer to use, ES1, ES2, ES3
+    settings.glesVersion = OF_GLES_VERSION; // type of renderer to use, ES1, ES2, ES3 - default ES2, set via OF_GLES_VERSION define
     settings.windowControllerType = ofxiOSWindowControllerType::GL_KIT; // Window Controller Type
     settings.colorType = ofxiOSRendererColorFormat::RGBA8888; // color format used default RGBA8888
     settings.depthType = ofxiOSRendererDepthFormat::DEPTH_NONE; // depth format (16/24) if depth enabled
diff --git a/scripts/templates/vs/src/main.cpp b/scripts/templates/vs/src/main.cpp
index 4e6518d49dc..9b9203fcad7 100644
--- a/scripts/templates/vs/src/main.cpp
+++ b/scripts/templates/vs/src/main.cpp
@@ -9,6 +9,10 @@ int main( ){
 	settings.setSize(1024, 768);
 	settings.windowMode = OF_WINDOW; //can also be OF_FULLSCREEN
 
+#if defined(OF_GL_VERSION_MAJOR) && defined(OF_GL_VERSION_MINOR)
+	settings.setGLVersion(OF_GL_VERSION_MAJOR, OF_GL_VERSION_MINOR); // set via projectGenerator OpenGL version
+#endif
+
 	auto window = ofCreateWindow(settings);
 
 	ofRunApp(window, std::make_shared<ofApp>());
diff --git a/scripts/templates/vs2019/src/main.cpp b/scripts/templates/vs2019/src/main.cpp
index 4e6518d49dc..9b9203fcad7 100644
--- a/scripts/templates/vs2019/src/main.cpp
+++ b/scripts/templates/vs2019/src/main.cpp
@@ -9,6 +9,10 @@ int main( ){
 	settings.setSize(1024, 768);
 	settings.windowMode = OF_WINDOW; //can also be OF_FULLSCREEN
 
+#if defined(OF_GL_VERSION_MAJOR) && defined(OF_GL_VERSION_MINOR)
+	settings.setGLVersion(OF_GL_VERSION_MAJOR, OF_GL_VERSION_MINOR); // set via projectGenerator OpenGL version
+#endif
+
 	auto window = ofCreateWindow(settings);
 
 	ofRunApp(window, std::make_shared<ofApp>());
diff --git a/scripts/templates/vs2026/src/main.cpp b/scripts/templates/vs2026/src/main.cpp
index 4e6518d49dc..9b9203fcad7 100644
--- a/scripts/templates/vs2026/src/main.cpp
+++ b/scripts/templates/vs2026/src/main.cpp
@@ -9,6 +9,10 @@ int main( ){
 	settings.setSize(1024, 768);
 	settings.windowMode = OF_WINDOW; //can also be OF_FULLSCREEN
 
+#if defined(OF_GL_VERSION_MAJOR) && defined(OF_GL_VERSION_MINOR)
+	settings.setGLVersion(OF_GL_VERSION_MAJOR, OF_GL_VERSION_MINOR); // set via projectGenerator OpenGL version
+#endif
+
 	auto window = ofCreateWindow(settings);
 
 	ofRunApp(window, std::make_shared<ofApp>());
diff --git a/scripts/templates/vscode/src/main.cpp b/scripts/templates/vscode/src/main.cpp
index 4e6518d49dc..9b9203fcad7 100644
--- a/scripts/templates/vscode/src/main.cpp
+++ b/scripts/templates/vscode/src/main.cpp
@@ -9,6 +9,10 @@ int main( ){
 	settings.setSize(1024, 768);
 	settings.windowMode = OF_WINDOW; //can also be OF_FULLSCREEN
 
+#if defined(OF_GL_VERSION_MAJOR) && defined(OF_GL_VERSION_MINOR)
+	settings.setGLVersion(OF_GL_VERSION_MAJOR, OF_GL_VERSION_MINOR); // set via projectGenerator OpenGL version
+#endif
+
 	auto window = ofCreateWindow(settings);
 
 	ofRunApp(window, std::make_shared<ofApp>());