diff --git a/examples/cli/main.cpp b/examples/cli/main.cpp
index 25ed7664a..dfac337ca 100644
--- a/examples/cli/main.cpp
+++ b/examples/cli/main.cpp
@@ -460,8 +460,8 @@ void sd_log_cb(enum sd_log_level_t level, const char* log, void* data) {
         return;
     }
     if (level <= SD_LOG_INFO) {
-        fputs(log, stdout);
-        fflush(stdout);
+        fputs(log, stderr);
+        fflush(stderr);
     } else {
         fputs(log, stderr);
         fflush(stderr);
@@ -597,7 +597,7 @@ int main(int argc, const char* argv[]) {
         std::string final_image_path = i > 0 ? dummy_name + "_" + std::to_string(i + 1) + ".png" : dummy_name + ".png";
         stbi_write_png(final_image_path.c_str(), results[i].width, results[i].height, results[i].channel,
                        results[i].data, 0, get_image_params(params, params.seed + i).c_str());
-        printf("save result image to '%s'\n", final_image_path.c_str());
+        fprintf(stderr, "save result image to '%s'\n", final_image_path.c_str());
         free(results[i].data);
         results[i].data = NULL;
     }
diff --git a/util.cpp b/util.cpp
index 4057d13d0..7f902b1b0 100644
--- a/util.cpp
+++ b/util.cpp
@@ -183,13 +183,15 @@ void pretty_progress(int step, int steps, float time) {
         }
     }
     progress += "|";
-    printf(time > 1.0f ? "\r%s %i/%i - %.2fs/it" : "\r%s %i/%i - %.2fit/s",
+    fprintf(stderr, time > 1.0f ? "\r%s %i/%i - %.2fs/it" : "\r%s %i/%i - %.2fit/s",
            progress.c_str(), step, steps,
            time > 1.0f || time == 0 ? time : (1.0f / time));
-    fflush(stdout);  // for linux
+    fflush(stderr);  // for linux
     if (step == steps) {
-        printf("\n");
+        fprintf(stderr, "\n");
     }
+    fprintf(stdout, "{'step' : '%i', 'steps': '%i', 'time': '%.2f'}\n", step, steps, time);
+    fflush(stdout);  // for linux
 }
 
 static sd_log_cb_t sd_log_cb = NULL;