diff --git a/HISTORY.rst b/HISTORY.rst
index 2e9af05c..1e07cb28 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -23,6 +23,7 @@ PlatformIO Core 4
   - Python callback as a target (use the power of Python interpreter and PlatformIO Build API)
 
 
+* Display system-wide information using `platformio system info <https://docs.platformio.org/page/core/userguide/system/cmd_info.html>`__ command (`issue #3521 <https://github.com/platformio/platformio-core/issues/3521>`_)
 * List available project targets (including dev-platform specific and custom targets) with a new `platformio run --list-targets <https://docs.platformio.org/page/core/userguide/cmd_run.html#cmdoption-platformio-run-list-targets>`__ command (`issue #3544 <https://github.com/platformio/platformio-core/issues/3544>`_)
 * Added support for "globstar/`**`" (recursive) pattern for the different commands and configuration options (`platformio ci <https://docs.platformio.org/page/core/userguide/cmd_ci.html>`__, `src_filter <https://docs.platformio.org/page/projectconf/section_env_build.html#src-filter>`__, `check_patterns <https://docs.platformio.org/page/projectconf/section_env_check.html#check-patterns>`__, `library.json > srcFilter <https://docs.platformio.org/page/librarymanager/config.html#srcfilter>`__). Python 3.5+ is required.
 * Added a new ``-e, --environment`` option to `platformio project init <https://docs.platformio.org/page/core/userguide/project/cmd_init.html#cmdoption-platformio-project-init-e>`__ command that helps to update a PlatformIO project using existing environment
diff --git a/docs b/docs
index 478d089d..f33f42cc 160000
--- a/docs
+++ b/docs
@@ -1 +1 @@
-Subproject commit 478d089d27feb4588d0aeb55a4edd33317fe9af4
+Subproject commit f33f42cc9c5ec30267dc8c0c845aeda63adda598
diff --git a/platformio/commands/system/command.py b/platformio/commands/system/command.py
index 48336bfd..fed66c40 100644
--- a/platformio/commands/system/command.py
+++ b/platformio/commands/system/command.py
@@ -12,17 +12,24 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-
+import json
+import platform
 import subprocess
+import sys
 
 import click
+from tabulate import tabulate
 
-from platformio import proc
+from platformio import __version__, proc, util
 from platformio.commands.system.completion import (
     get_completion_install_path,
     install_completion_code,
     uninstall_completion_code,
 )
+from platformio.managers.lib import LibraryManager
+from platformio.managers.package import PackageManager
+from platformio.managers.platform import PlatformManager
+from platformio.project.config import ProjectConfig
 
 
 @click.group("system", short_help="Miscellaneous system commands")
@@ -30,6 +37,44 @@ def cli():
     pass
 
 
+@cli.command("info", short_help="Display system-wide information")
+@click.option("--json-output", is_flag=True)
+def system_info(json_output):
+    project_config = ProjectConfig()
+    data = {}
+    data["core_version"] = {"title": "PlatformIO Core", "value": __version__}
+    data["python_version"] = {
+        "title": "Python",
+        "value": "{0}.{1}.{2}-{3}.{4}".format(*list(sys.version_info)),
+    }
+    data["system"] = {"title": "System Type", "value": util.get_systype()}
+    data["platform"] = {"title": "Platform", "value": platform.platform(terse=True)}
+    data["core_dir"] = {
+        "title": "PlatformIO Core Directory",
+        "value": project_config.get_optional_dir("core"),
+    }
+    data["global_lib_nums"] = {
+        "title": "Global Libraries",
+        "value": len(LibraryManager().get_installed()),
+    }
+    data["dev_platform_nums"] = {
+        "title": "Development Platforms",
+        "value": len(PlatformManager().get_installed()),
+    }
+    data["package_tool_nums"] = {
+        "title": "Package Tools",
+        "value": len(
+            PackageManager(project_config.get_optional_dir("packages")).get_installed()
+        ),
+    }
+
+    click.echo(
+        json.dumps(data)
+        if json_output
+        else tabulate([(item["title"], item["value"]) for item in data.values()])
+    )
+
+
 @cli.group("completion", short_help="Shell completion support")
 def completion():
     # pylint: disable=import-error,import-outside-toplevel