diff --git a/xwords4/android/app/src/main/java/org/eehouse/android/xw4/BoardCanvas.java b/xwords4/android/app/src/main/java/org/eehouse/android/xw4/BoardCanvas.java
index fa8a5d67d..b747182f3 100644
--- a/xwords4/android/app/src/main/java/org/eehouse/android/xw4/BoardCanvas.java
+++ b/xwords4/android/app/src/main/java/org/eehouse/android/xw4/BoardCanvas.java
@@ -49,7 +49,7 @@ public class BoardCanvas extends Canvas implements DrawCtx {
     private static final String TAG = BoardCanvas.class.getSimpleName();
     private static final int BLACK = 0xFF000000;
     private static final int WHITE = 0xFFFFFFFF;
-    private static final int FRAME_GREY = 0xFF101010;
+    private static final int LINE_PCT = 3;
     private static final int SCORE_HT_DROP = 2;
     private static final boolean DEBUG_DRAWFRAMES = false;
     private static final int NOT_TURN_ALPHA = 0x3FFFFFFF;
@@ -442,7 +442,10 @@ public class BoardCanvas extends Canvas implements DrawCtx {
             }
 
             // frame the cell
-            m_strokePaint.setColor( adjustColor(FRAME_GREY) );
+            int frameColor = m_otherColors[CommonPrefs.COLOR_CELLLINE];
+            m_strokePaint.setColor( adjustColor(frameColor) );
+            int width = Math.max(1, (rect.width() * LINE_PCT) / 100);
+            m_strokePaint.setStrokeWidth( width );
             drawRect( rect, m_strokePaint );
 
             drawCrosshairs( rect, flags );
@@ -559,7 +562,8 @@ public class BoardCanvas extends Canvas implements DrawCtx {
             // the board (without scrolling), the right-most cells
             // don't draw their right borders due to clipping, so draw
             // for them.
-            m_strokePaint.setColor( adjustColor(FRAME_GREY) );
+            int frameColor = m_otherColors[CommonPrefs.COLOR_CELLLINE];
+            m_strokePaint.setColor( adjustColor(frameColor) );
             int xx = rect.left + rect.width() - 1;
             drawLine( xx, rect.top, xx, rect.top + rect.height(),
                       m_strokePaint );
diff --git a/xwords4/android/app/src/main/java/org/eehouse/android/xw4/PrefsDelegate.java b/xwords4/android/app/src/main/java/org/eehouse/android/xw4/PrefsDelegate.java
index 9abb91d43..65919a3a8 100644
--- a/xwords4/android/app/src/main/java/org/eehouse/android/xw4/PrefsDelegate.java
+++ b/xwords4/android/app/src/main/java/org/eehouse/android/xw4/PrefsDelegate.java
@@ -102,6 +102,7 @@ public class PrefsDelegate extends DelegateBase
                             R.string.key_empty,
                             R.string.key_background,
                             R.string.key_clr_bonushint,
+                            R.string.key_cellline,
                         };
                         for ( int colorKey : colorKeys ) {
                             editor.remove( getString(colorKey) );
diff --git a/xwords4/android/app/src/main/java/org/eehouse/android/xw4/jni/CommonPrefs.java b/xwords4/android/app/src/main/java/org/eehouse/android/xw4/jni/CommonPrefs.java
index c1014ab3a..52b986855 100644
--- a/xwords4/android/app/src/main/java/org/eehouse/android/xw4/jni/CommonPrefs.java
+++ b/xwords4/android/app/src/main/java/org/eehouse/android/xw4/jni/CommonPrefs.java
@@ -40,7 +40,8 @@ public class CommonPrefs extends XWPrefs {
     public static final int COLOR_FOCUS = 2;
     public static final int COLOR_BACKGRND = 3;
     public static final int COLOR_BONUSHINT = 4;
-    public static final int COLOR_LAST = 5;
+    public static final int COLOR_CELLLINE = 5;
+    public static final int COLOR_LAST = 6;
 
     private static CommonPrefs s_cp = null;
 
@@ -108,6 +109,7 @@ public class CommonPrefs extends XWPrefs {
                            R.string.key_clr_crosshairs,
                            R.string.key_background,
                            R.string.key_clr_bonushint,
+                           R.string.key_cellline,
         };
         for ( int ii = 0; ii < idsOther.length; ++ii ) {
             otherColors[ii] = prefToColor( context, sp, idsOther[ii] );
diff --git a/xwords4/android/app/src/main/res/values/common_rsrc.xml b/xwords4/android/app/src/main/res/values/common_rsrc.xml
index 6b89e703d..45fdb86e9 100644
--- a/xwords4/android/app/src/main/res/values/common_rsrc.xml
+++ b/xwords4/android/app/src/main/res/values/common_rsrc.xml
@@ -31,6 +31,7 @@
   <string name="key_tile_back">key_clr_tile_back</string>
   <string name="key_empty">key_clr_empty</string>
   <string name="key_background">key_clr_background</string>
+  <string name="key_cellline">key_cellline</string>
   <string name="key_clr_crosshairs">key_clr_crosshairs</string>
   <string name="key_clr_bonushint">key_clr_bonushint</string>
 
diff --git a/xwords4/android/app/src/main/res/values/strings.xml b/xwords4/android/app/src/main/res/values/strings.xml
index 40a1f58a0..a311ed0c7 100644
--- a/xwords4/android/app/src/main/res/values/strings.xml
+++ b/xwords4/android/app/src/main/res/values/strings.xml
@@ -889,6 +889,8 @@
     <!-- the color of text, e.g. "2L", shown on a bonus square on the
          board -->
     <string name="key_bonushint">In-square bonus hint</string>
+    <!-- The color of the lines delimiting cells on the board -->
+    <string name="cellline">Board lines</string>
     <!--       
        ############################################################
        # :Dialogs:
diff --git a/xwords4/android/app/src/main/res/xml/xwprefs.xml b/xwords4/android/app/src/main/res/xml/xwprefs.xml
index 160bc4f77..2224324bb 100644
--- a/xwords4/android/app/src/main/res/xml/xwprefs.xml
+++ b/xwords4/android/app/src/main/res/xml/xwprefs.xml
@@ -241,6 +241,12 @@
           android:title="@string/background"
           android:defaultValue="0xFFFFFF"
           />
+
+      <org.eehouse.android.xw4.EditColorPreference
+          android:key="@string/key_cellline"
+          android:title="@string/cellline"
+          android:defaultValue="0x101010"
+          />
     </PreferenceScreen>
 
   </PreferenceScreen>