diff --git a/scripts/reproducability-test.sh b/scripts/reproducability-test.sh
new file mode 100755
index 0000000..79e944b
--- /dev/null
+++ b/scripts/reproducability-test.sh
@@ -0,0 +1,57 @@
+#!/bin/bash
+
+### VARIABLES
+
+REPRODUCABILITY=5         # how many times we need to build with same hash
+
+### TEST STARTS HERE ###
+
+CURRENT_DIR=$(pwd)
+
+if [[ $(echo $0 | awk -F"/" '{print NF-1}') -eq 1 ]] ; then
+  # we need to go one directory up
+  cd ..
+fi
+
+# cleanup after self if we already ran and previous test crashed or 
+# something before it cleaned up after itself.
+rm -rf /tmp/uw-test-runs/* 2>/dev/null # we not interested if fails
+
+# make new folder if it doesn't exist
+mkdir -p /tmp/uw-test-runs 
+
+for ((run=0;run<$REPRODUCABILITY;run++)) ; do
+  echo ""
+  echo "---- run ${run} ----"
+  
+  # save hash and then run build. Save hash.
+  OLD_HASH=$HASH
+  HASH=$(npm run build 2>/dev/null | grep "Hash:")
+  
+  # move build file to /tmp, where it'll be saved for later
+  mv dist-ff /tmp/uw-test-runs/${run}
+  
+  # skip comparisons with previous tests on first run,
+  # cos we don't have anything to compare against yet
+  if [[ $run -ne 0 ]] ; then
+    if [[ "$OLD_HASH" == "$HASH" ]] ; then
+      echo "Hashes ok${HASH##*:}"
+    else 
+      echo "Webpack hashes do not match! (${OLD_HASH##*:} <---> ${HASH##*:})"
+    fi
+    
+    echo "Diff test (no output=ok):"
+    diff -qr /tmp/uw-test-runs/${prev_run} /tmp/uw-test-runs/${run}
+  else
+    echo "Webpack hash: $HASH"
+  fi
+  
+  # save id of previous run
+  prev_run=$run
+done
+
+# clean up after self
+rm -rf /tmp/uw-test-runs
+
+# restore dir
+cd "$CURRENT_DIR"