diff --git a/xwords4/android/scripts/apk-cmp.py b/xwords4/android/scripts/apk-cmp.py
new file mode 100755
index 000000000..25cf313b3
--- /dev/null
+++ b/xwords4/android/scripts/apk-cmp.py
@@ -0,0 +1,127 @@
+#!/usr/bin/python
+
+import difflib, getopt, glob, os, sys, zipfile
+
+def usage(msg = None):
+    if msg: print 'Error:', msg
+    print 'usage: ', sys.argv[0], '[-d indx]* [-a <path>]{2}  # picks newest gradle and ant builds by default'
+    sys.exit(1)
+
+def getOrderedGradleApks():
+    paths = glob.glob('./app/build/outputs/apk/app-debug.apk')
+    sorted(paths, key=lambda path: os.path.getmtime(path))
+    # print 'getOrderedGradleApks() =>', paths
+    return paths
+    
+def getOrderedAntApks():
+    paths = glob.glob('./*.apk')
+    sorted(paths, key=lambda path: os.path.getmtime(path))
+    # print 'getOrderedAntApks() =>', paths
+    return paths
+
+# Check that files given exist, and if there aren't enough add more,
+# trying to make them the newest gradle and ant builds.
+def checkApks( apks ):
+    for apk in apks:
+        if not os.path.exists( apk ):
+            usage( 'no such file: {path}'.format(path=apk))
+            
+    if 2 < len(apks):
+        usage( 'too many apk files to compare' )
+    elif 2 == len(apks):
+        None
+    else:
+        gradleApks = getOrderedGradleApks()
+        antApks = getOrderedAntApks()
+        count = len(apks)
+        for ii in range(2):
+            if ii < count:
+                apk = apks[ii]
+                if apk in gradleApks:
+                    gradleApks = []
+                elif apk in antApks:
+                    antApks = []
+                else:
+                    usage( 'something wrong' )
+            elif 0 < len(gradleApks):
+                apks.append( gradleApks[0] )
+                gradleApks = []
+            elif 0 < len(antApks):
+                apks.append( antApks[0] )
+                antApks = []
+            else:
+                usage( 'unable to find suitable default .apk' )
+    return apks
+
+def load( apks ):
+    results = []
+    for apk in apks:
+        files = {}
+        if not zipfile.is_zipfile( apk ): usage( apk + " does not appear to be an apk")
+        zf = zipfile.ZipFile(apk, 'r')
+        for info in zf.infolist():
+            data = {'size': info.file_size, 'crc': info.CRC, }
+            files[str(info.filename)] = data
+        results.append( {'files' : files, 'name' : apk} )
+    return results
+
+def printDiff( apks, key ):
+    data0 = zipfile.ZipFile(apks[0], 'r').read(key)
+    data1 = zipfile.ZipFile(apks[1], 'r').read(key)
+    print '---- diff:', key, apks[0], apks[1], len(data0), len(data1)
+    # print data0
+    diff = difflib.ndiff( data0.splitlines(1), data1.splitlines(1) )
+    print ''.join(diff)
+
+def compare( apks, apkData, indices ):
+    print 'Comparing {one} and {two}'.format(one=apks[0], two=apks[1])
+    same = 0
+    index = 0
+    keys = list( set( apkData[0]['files'].keys() + apkData[1]['files'].keys() ) )
+    keys.sort()
+    for key in keys:
+        lines = []
+        sizes = set()
+        crcs = set()
+        for apk in apkData:
+            apk = apk['files']
+            if key in apk:
+                size = apk[key]['size']
+                sizes.add(size)
+                crc = apk[key]['crc']
+                crcs.add( crc )
+            else:
+                size = 0
+            lines.append( '{size: >6}b {crc:x}'.format(name=key, size=size, crc=crc) )
+        if 1 == len(sizes) and 1 == len(crcs):
+            same = same + 1 # same size?
+        else:
+            if not indices or index in indices:
+                print '{index: >4}: {name: <60} '.format(index=index, name=key), ' '.join(lines)
+            if index in indices:
+                printDiff( apks, key )
+            index += 1
+    if 0 != same:
+        print "(skipped {same} files)".format(same=same)
+
+def main():
+    apks = []
+    indices = []
+    try:
+        pairs, rest = getopt.getopt(sys.argv[1:], "a:d:")
+        for option, value in pairs:
+            if option == '-a': apks.append(value)
+            elif option == '-d': indices.append(int(value))
+            else: usage()
+    except:
+        usage()
+
+    apks = checkApks( apks )
+    print apks[0], apks[1]
+    apkData = load( apks )
+    compare( apks, apkData, indices )
+
+
+##############################################################################
+if __name__ == '__main__':
+    main()