diff --git a/wasp/apps/testapp.py b/wasp/apps/testapp.py
index 66d3fce..2b2e05b 100644
--- a/wasp/apps/testapp.py
+++ b/wasp/apps/testapp.py
@@ -5,9 +5,11 @@
 ~~~~~~~~~~~~~
 """
 
-import machine
 import wasp
+
+import gc
 import icons
+import machine
 
 from apps.pager import PagerApp
 
@@ -23,7 +25,7 @@ class TestApp():
     ICON = icons.app
 
     def __init__(self):
-        self.tests = ('Alarm', 'Button', 'Crash', 'Colours', 'Fill', 'Fill-H', 'Fill-V', 'Line', 'Notifications', 'RLE', 'String', 'Touch', 'Wrap')
+        self.tests = ('Alarm', 'Button', 'Crash', 'Colours', 'Fill', 'Fill-H', 'Fill-V', 'Free Mem', 'Line', 'Notifications', 'RLE', 'String', 'Touch', 'Wrap')
         self.test = self.tests[0]
         self.scroll = wasp.widgets.ScrollIndicator()
 
@@ -226,6 +228,15 @@ class TestApp():
             for s in self._sliders:
                 s.draw()
             self._update_colours()
+        elif self.test == 'Free Mem':
+            if wasp.watch.free:
+                draw.string("Boot: {}".format(wasp.watch.free), 12, 3*24)
+                draw.string("Init: {}".format(wasp.free), 12, 4*24)
+                draw.string("Now: {}".format(gc.mem_free()), 12, 5*24)
+                gc.collect()
+                draw.string("GC: {}".format(gc.mem_free()), 12, 6*24)
+            else:
+                draw.string("Not supported", 12, 4*24)
         elif self.test == 'Notifications':
             draw.string('+', 24, 100)
             draw.string('-', 210, 100)
diff --git a/wasp/boards/k9/watch.py.in b/wasp/boards/k9/watch.py.in
index b7bfabc..8360451 100644
--- a/wasp/boards/k9/watch.py.in
+++ b/wasp/boards/k9/watch.py.in
@@ -13,6 +13,7 @@ from drivers.nrf_rtc import RTC
 rtc = RTC(RTCounter(1, mode=RTCounter.PERIODIC, period=1, callback=_callback))
 rtc.counter.start()
 
+import gc
 import os
 import time
 
@@ -135,3 +136,6 @@ try:
 except:
     drawable.string("FAILED", 0, 136, width=240)
 backlight.set(2)
+
+gc.collect()
+free = gc.mem_free()
diff --git a/wasp/boards/p8/watch.py.in b/wasp/boards/p8/watch.py.in
index 9018a66..e133fee 100644
--- a/wasp/boards/p8/watch.py.in
+++ b/wasp/boards/p8/watch.py.in
@@ -13,6 +13,7 @@ from drivers.nrf_rtc import RTC
 rtc = RTC(RTCounter(1, mode=RTCounter.PERIODIC, period=1, callback=_callback))
 rtc.counter.start()
 
+import gc
 import os
 import time
 
@@ -123,3 +124,6 @@ try:
 except:
     drawable.string("FAILED", 0, 136, width=240)
 backlight.set(1)
+
+gc.collect()
+free = gc.mem_free()
diff --git a/wasp/boards/pinetime/watch.py.in b/wasp/boards/pinetime/watch.py.in
index fbda41e..6db9537 100644
--- a/wasp/boards/pinetime/watch.py.in
+++ b/wasp/boards/pinetime/watch.py.in
@@ -13,6 +13,7 @@ from drivers.nrf_rtc import RTC
 rtc = RTC(RTCounter(1, mode=RTCounter.PERIODIC, period=1, callback=_callback))
 rtc.counter.start()
 
+import gc
 import os
 import time
 
@@ -125,3 +126,6 @@ try:
 except:
     drawable.string("FAILED", 0, 136, width=240)
 backlight.set(1)
+
+gc.collect()
+free = gc.mem_free()
diff --git a/wasp/boards/simulator/watch.py b/wasp/boards/simulator/watch.py
index 98d9246..5aead3f 100644
--- a/wasp/boards/simulator/watch.py
+++ b/wasp/boards/simulator/watch.py
@@ -188,3 +188,6 @@ vibrator = Vibrator(Pin('MOTOR', Pin.OUT, value=0), active_low=True)
 
 def connected():
     return not (int(rtc.uptime / 30) & 1)
+
+# Free memory cannot be measured on the simulator
+free = 0
diff --git a/wasp/wasp.py b/wasp/wasp.py
index 7f4d0d4..7cf2883 100644
--- a/wasp/wasp.py
+++ b/wasp/wasp.py
@@ -441,12 +441,17 @@ class Manager():
         normal execution context meaning any exceptions and other problems
         can be observed interactively via the console.
         """
+        global free
+
         if self._scheduling:
             print('Watch already running in the background')
             return
 
         if not self.app:
             self.switch(self.quick_ring[0])
+            if watch.free:
+                gc.collect()
+                free = gc.mem_free()
 
         # Reminder: wasptool uses this string to confirm the device has
         # been set running again.
@@ -494,8 +499,13 @@ class Manager():
 
     def schedule(self, enable=True):
         """Run the system manager synchronously."""
+        global free
+
         if not self.app:
             self.switch(self.quick_ring[0])
+            if watch.free:
+                gc.collect()
+                free = gc.mem_free()
 
         if enable:
             watch.schedule = self._schedule