diff --git a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Checkmark.java b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Checkmark.java
index bb6ccc4f3..6683d6543 100644
--- a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Checkmark.java
+++ b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Checkmark.java
@@ -23,6 +23,8 @@ import org.apache.commons.lang3.builder.*;
 
 import javax.annotation.concurrent.*;
 
+import static org.isoron.uhabits.core.utils.StringUtils.defaultToStringStyle;
+
 /**
  * A Checkmark represents the completion status of the habit for a given day.
  * <p>
@@ -108,7 +110,7 @@ public final class Checkmark
     @Override
     public String toString()
     {
-        return new ToStringBuilder(this)
+        return new ToStringBuilder(this, defaultToStringStyle())
             .append("timestamp", timestamp)
             .append("value", value)
             .toString();
diff --git a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/CheckmarkList.java b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/CheckmarkList.java
index fa90587d2..7defa5387 100644
--- a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/CheckmarkList.java
+++ b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/CheckmarkList.java
@@ -31,6 +31,7 @@ import java.util.*;
 import javax.annotation.concurrent.*;
 
 import static org.isoron.uhabits.core.models.Checkmark.*;
+import static org.isoron.uhabits.core.utils.StringUtils.defaultToStringStyle;
 
 /**
  * The collection of {@link Checkmark}s belonging to a habit.
@@ -396,7 +397,7 @@ public abstract class CheckmarkList
         @Override
         public String toString()
         {
-            return new ToStringBuilder(this)
+            return new ToStringBuilder(this, defaultToStringStyle())
                 .append("begin", begin)
                 .append("center", center)
                 .append("end", end)
diff --git a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Frequency.java b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Frequency.java
index d12ff8ad2..f16e180e0 100644
--- a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Frequency.java
+++ b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Frequency.java
@@ -23,6 +23,8 @@ import org.apache.commons.lang3.builder.*;
 
 import javax.annotation.concurrent.*;
 
+import static org.isoron.uhabits.core.utils.StringUtils.defaultToStringStyle;
+
 /**
  * Represents how often is the habit repeated.
  */
@@ -92,7 +94,7 @@ public class Frequency
     @Override
     public String toString()
     {
-        return new ToStringBuilder(this)
+        return new ToStringBuilder(this, defaultToStringStyle())
             .append("numerator", numerator)
             .append("denominator", denominator)
             .toString();
diff --git a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Habit.java b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Habit.java
index 9d63c1476..69e41bead 100644
--- a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Habit.java
+++ b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Habit.java
@@ -29,6 +29,7 @@ import javax.annotation.concurrent.*;
 import javax.inject.*;
 
 import static org.isoron.uhabits.core.models.Checkmark.*;
+import static org.isoron.uhabits.core.utils.StringUtils.defaultToStringStyle;
 
 /**
  * The thing that the user wants to track.
@@ -414,7 +415,7 @@ public class Habit
         @Override
         public String toString()
         {
-            return new ToStringBuilder(this)
+            return new ToStringBuilder(this, defaultToStringStyle())
                 .append("name", name)
                 .append("description", description)
                 .append("frequency", frequency)
@@ -475,7 +476,7 @@ public class Habit
     @Override
     public String toString()
     {
-        return new ToStringBuilder(this)
+        return new ToStringBuilder(this, defaultToStringStyle())
             .append("id", id)
             .append("data", data)
             .toString();
diff --git a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Reminder.java b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Reminder.java
index 878da7260..870954605 100644
--- a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Reminder.java
+++ b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Reminder.java
@@ -23,6 +23,8 @@ import android.support.annotation.*;
 
 import org.apache.commons.lang3.builder.*;
 
+import static org.isoron.uhabits.core.utils.StringUtils.defaultToStringStyle;
+
 public final class Reminder
 {
     private final int hour;
@@ -83,7 +85,7 @@ public final class Reminder
     @Override
     public String toString()
     {
-        return new ToStringBuilder(this)
+        return new ToStringBuilder(this, defaultToStringStyle())
             .append("hour", hour)
             .append("minute", minute)
             .append("days", days)
diff --git a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Repetition.java b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Repetition.java
index 762234696..ea8951ed4 100644
--- a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Repetition.java
+++ b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Repetition.java
@@ -21,6 +21,8 @@ package org.isoron.uhabits.core.models;
 
 import org.apache.commons.lang3.builder.*;
 
+import static org.isoron.uhabits.core.utils.StringUtils.defaultToStringStyle;
+
 /**
  * Represents a record that the user has performed a certain habit at a certain
  * date.
@@ -89,7 +91,7 @@ public final class Repetition
     @Override
     public String toString()
     {
-        return new ToStringBuilder(this)
+        return new ToStringBuilder(this, defaultToStringStyle())
             .append("timestamp", timestamp)
             .append("value", value)
             .toString();
diff --git a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Score.java b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Score.java
index 93e03f5f2..9e5c1fd97 100644
--- a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Score.java
+++ b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Score.java
@@ -22,6 +22,7 @@ package org.isoron.uhabits.core.models;
 import org.apache.commons.lang3.builder.*;
 
 import static java.lang.Math.*;
+import static org.isoron.uhabits.core.utils.StringUtils.defaultToStringStyle;
 
 /**
  * Represents how strong a habit is at a certain date.
@@ -88,7 +89,7 @@ public final class Score
     @Override
     public String toString()
     {
-        return new ToStringBuilder(this)
+        return new ToStringBuilder(this, defaultToStringStyle())
             .append("timestamp", timestamp)
             .append("value", value)
             .toString();
diff --git a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Streak.java b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Streak.java
index 00e27b075..4a66bed7a 100644
--- a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Streak.java
+++ b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Streak.java
@@ -21,6 +21,8 @@ package org.isoron.uhabits.core.models;
 
 import org.apache.commons.lang3.builder.*;
 
+import static org.isoron.uhabits.core.utils.StringUtils.defaultToStringStyle;
+
 public final class Streak
 {
     private final Timestamp start;
@@ -64,7 +66,7 @@ public final class Streak
     @Override
     public String toString()
     {
-        return new ToStringBuilder(this)
+        return new ToStringBuilder(this, defaultToStringStyle())
             .append("start", start)
             .append("end", end)
             .toString();
diff --git a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Timestamp.java b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Timestamp.java
index ba45b19cb..1c58c596e 100644
--- a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Timestamp.java
+++ b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Timestamp.java
@@ -24,6 +24,7 @@ import org.apache.commons.lang3.builder.*;
 import java.util.*;
 
 import static java.util.Calendar.DAY_OF_WEEK;
+import static org.isoron.uhabits.core.utils.StringUtils.defaultToStringStyle;
 
 public final class Timestamp
 {
@@ -137,7 +138,7 @@ public final class Timestamp
     @Override
     public String toString()
     {
-        return new ToStringBuilder(this)
+        return new ToStringBuilder(this, defaultToStringStyle())
             .append("unixTime", unixTime)
             .toString();
     }
diff --git a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/WeekdayList.java b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/WeekdayList.java
index 3c24e7814..67325e915 100644
--- a/uhabits-core/src/main/java/org/isoron/uhabits/core/models/WeekdayList.java
+++ b/uhabits-core/src/main/java/org/isoron/uhabits/core/models/WeekdayList.java
@@ -23,6 +23,8 @@ import org.apache.commons.lang3.builder.*;
 
 import java.util.*;
 
+import static org.isoron.uhabits.core.utils.StringUtils.defaultToStringStyle;
+
 public final class WeekdayList
 {
     public static final WeekdayList EVERY_DAY = new WeekdayList(127);
@@ -92,7 +94,7 @@ public final class WeekdayList
     @Override
     public String toString()
     {
-        return new ToStringBuilder(this)
+        return new ToStringBuilder(this, defaultToStringStyle())
             .append("weekdays", weekdays)
             .toString();
     }
diff --git a/uhabits-core/src/main/java/org/isoron/uhabits/core/utils/StringUtils.java b/uhabits-core/src/main/java/org/isoron/uhabits/core/utils/StringUtils.java
index 62da96f8d..f12d8b3c0 100644
--- a/uhabits-core/src/main/java/org/isoron/uhabits/core/utils/StringUtils.java
+++ b/uhabits-core/src/main/java/org/isoron/uhabits/core/utils/StringUtils.java
@@ -19,18 +19,35 @@
 
 package org.isoron.uhabits.core.utils;
 
+import org.apache.commons.lang3.builder.*;
+
 import java.math.*;
 import java.util.*;
 
 public class StringUtils
 {
+    private static StandardToStringStyle toStringStyle = null;
+
     public static String getRandomId()
     {
         return new BigInteger(260, new Random()).toString(32).substring(0, 32);
     }
 
-    public static String removePointers(String original)
+    public static ToStringStyle defaultToStringStyle()
     {
-        return original.replaceAll("@[0-9a-f]*", "@00000000");
+        if (toStringStyle == null)
+        {
+            toStringStyle = new StandardToStringStyle();
+            toStringStyle.setFieldSeparator(", ");
+            toStringStyle.setUseClassName(false);
+            toStringStyle.setUseIdentityHashCode(false);
+            toStringStyle.setContentStart("{");
+            toStringStyle.setContentEnd("}");
+            toStringStyle.setFieldNameValueSeparator(": ");
+            toStringStyle.setArrayStart("[");
+            toStringStyle.setArrayEnd("]");
+        }
+
+        return toStringStyle;
     }
 }
diff --git a/uhabits-core/src/test/java/org/isoron/uhabits/core/models/CheckmarkListTest.java b/uhabits-core/src/test/java/org/isoron/uhabits/core/models/CheckmarkListTest.java
index e741b6fab..bc79140af 100644
--- a/uhabits-core/src/test/java/org/isoron/uhabits/core/models/CheckmarkListTest.java
+++ b/uhabits-core/src/test/java/org/isoron/uhabits/core/models/CheckmarkListTest.java
@@ -31,7 +31,6 @@ import nl.jqno.equalsverifier.*;
 import static org.hamcrest.MatcherAssert.*;
 import static org.hamcrest.core.IsEqual.*;
 import static org.isoron.uhabits.core.models.Checkmark.*;
-import static org.isoron.uhabits.core.utils.StringUtils.removePointers;
 
 public class CheckmarkListTest extends BaseUnitTest
 {
@@ -360,21 +359,14 @@ public class CheckmarkListTest extends BaseUnitTest
     {
         Timestamp t = Timestamp.ZERO.plus(100);
         Checkmark checkmark = new Checkmark(t, 2);
-        String s = removePointers(checkmark.toString());
-        assertThat(s, equalTo(
-            "org.isoron.uhabits.core.models.Checkmark@00000000[" +
-            "timestamp=org.isoron.uhabits.core.models.Timestamp@00000000[unixTime=8640000000]," +
-            "value=2]"));
-
+        assertThat(checkmark.toString(),
+            equalTo("{timestamp: {unixTime: 8640000000}, value: 2}"));
 
         CheckmarkList.Interval interval =
             new CheckmarkList.Interval(t, t.plus(1), t.plus(2));
-        s = removePointers(interval.toString());
-        assertThat(s, equalTo(
-            "org.isoron.uhabits.core.models.CheckmarkList$Interval@00000000[" +
-                "begin=org.isoron.uhabits.core.models.Timestamp@00000000[unixTime=8640000000]," +
-                "center=org.isoron.uhabits.core.models.Timestamp@00000000[unixTime=8726400000]," +
-                "end=org.isoron.uhabits.core.models.Timestamp@00000000[unixTime=8812800000]]"));
+        assertThat(interval.toString(), equalTo(
+            "{begin: {unixTime: 8640000000}, center: {unixTime: 8726400000}," +
+            " end: {unixTime: 8812800000}}"));
     }
 
     @Test
diff --git a/uhabits-core/src/test/java/org/isoron/uhabits/core/models/HabitTest.java b/uhabits-core/src/test/java/org/isoron/uhabits/core/models/HabitTest.java
index 87b16fdf4..f864703fb 100644
--- a/uhabits-core/src/test/java/org/isoron/uhabits/core/models/HabitTest.java
+++ b/uhabits-core/src/test/java/org/isoron/uhabits/core/models/HabitTest.java
@@ -27,7 +27,6 @@ import nl.jqno.equalsverifier.*;
 
 import static org.hamcrest.CoreMatchers.*;
 import static org.isoron.uhabits.core.utils.DateUtils.*;
-import static org.isoron.uhabits.core.utils.StringUtils.removePointers;
 import static org.junit.Assert.*;
 
 public class HabitTest extends BaseUnitTest
@@ -150,22 +149,14 @@ public class HabitTest extends BaseUnitTest
     {
         Habit h = modelFactory.buildHabit();
         h.setReminder(new Reminder(22, 30, WeekdayList.EVERY_DAY));
-
-        String s = removePointers(h.toString());
-
-        String expected =
-            "org.isoron.uhabits.core.models.Habit@00000000[" +
-                "id=<null>," +
-                "data=org.isoron.uhabits.core.models.Habit$HabitData@00000000[" +
-                    "name=,description=," +
-                    "frequency=org.isoron.uhabits.core.models.Frequency@00000000[numerator=3,denominator=7]," +
-                    "color=8,archived=false,targetType=0,targetValue=100.0,type=0,unit=," +
-                    "reminder=org.isoron.uhabits.core.models.Reminder@00000000[" +
-                        "hour=22,minute=30," +
-                        "days=org.isoron.uhabits.core.models.WeekdayList@00000000[" +
-                            "weekdays={true,true,true,true,true,true,true}]]," +
-                    "position=0]]";
-
-        assertThat(s, equalTo(expected));
+        String expected = "{id: <null>, data: {name: , description: ," +
+                          " frequency: {numerator: 3, denominator: 7}," +
+                          " color: 8, archived: false, targetType: 0," +
+                          " targetValue: 100.0, type: 0, unit: ," +
+                          " reminder: {hour: 22, minute: 30," +
+                          " days: {weekdays: [true,true,true,true,true,true,true]}}," +
+                          " position: 0}}";
+
+        assertThat(h.toString(), equalTo(expected));
     }
 }
\ No newline at end of file
diff --git a/uhabits-core/src/test/java/org/isoron/uhabits/core/models/RepetitionListTest.java b/uhabits-core/src/test/java/org/isoron/uhabits/core/models/RepetitionListTest.java
index 1a9258e9c..42361194f 100644
--- a/uhabits-core/src/test/java/org/isoron/uhabits/core/models/RepetitionListTest.java
+++ b/uhabits-core/src/test/java/org/isoron/uhabits/core/models/RepetitionListTest.java
@@ -30,7 +30,6 @@ import java.util.*;
 import static junit.framework.TestCase.assertFalse;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.core.IsEqual.*;
-import static org.isoron.uhabits.core.utils.StringUtils.removePointers;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 import static org.mockito.Mockito.*;
@@ -192,10 +191,6 @@ public class RepetitionListTest extends BaseUnitTest
     public void testToString() throws Exception
     {
         Repetition rep = new Repetition(Timestamp.ZERO.plus(100), 20);
-        String s = removePointers(rep.toString());
-        assertThat(s, equalTo(
-            "org.isoron.uhabits.core.models.Repetition@00000000[" +
-                "timestamp=org.isoron.uhabits.core.models.Timestamp@00000000[unixTime=8640000000]," +
-                "value=20]"));
+        assertThat(rep.toString(), equalTo("{timestamp: {unixTime: 8640000000}, value: 20}"));
     }
 }
\ No newline at end of file
diff --git a/uhabits-core/src/test/java/org/isoron/uhabits/core/models/ScoreTest.java b/uhabits-core/src/test/java/org/isoron/uhabits/core/models/ScoreTest.java
index 4f083a04b..5a9693312 100644
--- a/uhabits-core/src/test/java/org/isoron/uhabits/core/models/ScoreTest.java
+++ b/uhabits-core/src/test/java/org/isoron/uhabits/core/models/ScoreTest.java
@@ -22,11 +22,10 @@ package org.isoron.uhabits.core.models;
 import org.isoron.uhabits.core.*;
 import org.junit.*;
 
-import static org.hamcrest.MatcherAssert.assertThat;
-import static org.hamcrest.core.IsEqual.equalTo;
-import static org.hamcrest.number.IsCloseTo.closeTo;
-import static org.isoron.uhabits.core.models.Score.compute;
-import static org.isoron.uhabits.core.utils.StringUtils.removePointers;
+import static org.hamcrest.MatcherAssert.*;
+import static org.hamcrest.core.IsEqual.*;
+import static org.hamcrest.number.IsCloseTo.*;
+import static org.isoron.uhabits.core.models.Score.*;
 
 
 public class ScoreTest extends BaseUnitTest
@@ -75,10 +74,6 @@ public class ScoreTest extends BaseUnitTest
     public void testToString() throws Exception
     {
         Score score = new Score(Timestamp.ZERO.plus(100), 150.0);
-        String string = removePointers(score.toString());
-        assertThat(string, equalTo(
-            "org.isoron.uhabits.core.models.Score@00000000[" +
-            "timestamp=org.isoron.uhabits.core.models.Timestamp@00000000[unixTime=8640000000]," +
-            "value=150.0]"));
+        assertThat(score.toString(), equalTo( "{timestamp: {unixTime: 8640000000}, value: 150.0}"));
     }
 }
diff --git a/uhabits-core/src/test/java/org/isoron/uhabits/core/models/StreakListTest.java b/uhabits-core/src/test/java/org/isoron/uhabits/core/models/StreakListTest.java
index 8103db9e6..30294a978 100644
--- a/uhabits-core/src/test/java/org/isoron/uhabits/core/models/StreakListTest.java
+++ b/uhabits-core/src/test/java/org/isoron/uhabits/core/models/StreakListTest.java
@@ -28,7 +28,6 @@ import java.util.*;
 import static junit.framework.TestCase.*;
 import static org.hamcrest.MatcherAssert.*;
 import static org.hamcrest.core.IsEqual.*;
-import static org.isoron.uhabits.core.utils.StringUtils.*;
 import static org.mockito.Mockito.*;
 
 public class StreakListTest extends BaseUnitTest
@@ -124,10 +123,7 @@ public class StreakListTest extends BaseUnitTest
     {
         Timestamp time = Timestamp.ZERO.plus(100);
         Streak streak = new Streak(time, time.plus(10));
-        String string = removePointers(streak.toString());
-        assertThat(string, equalTo(
-            "org.isoron.uhabits.core.models.Streak@00000000[" +
-            "start=org.isoron.uhabits.core.models.Timestamp@00000000[unixTime=8640000000]," +
-            "end=org.isoron.uhabits.core.models.Timestamp@00000000[unixTime=9504000000]]"));
+        assertThat(streak.toString(), equalTo(
+            "{start: {unixTime: 8640000000}, end: {unixTime: 9504000000}}"));
     }
 }
\ No newline at end of file