diff --git a/android/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Frequency.java b/android/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Frequency.java
deleted file mode 100644
index f16e180e0..000000000
--- a/android/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Frequency.java
+++ /dev/null
@@ -1,102 +0,0 @@
-/*
- * Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
- *
- * This file is part of Loop Habit Tracker.
- *
- * Loop Habit Tracker is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by the
- * Free Software Foundation, either version 3 of the License, or (at your
- * option) any later version.
- *
- * Loop Habit Tracker is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-package org.isoron.uhabits.core.models;
-
-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.
- */
-@ThreadSafe
-public class Frequency
-{
-    public static final Frequency DAILY = new Frequency(1, 1);
-
-    public static final Frequency FIVE_TIMES_PER_WEEK = new Frequency(5, 7);
-
-    public static final Frequency THREE_TIMES_PER_WEEK = new Frequency(3, 7);
-
-    public static final Frequency TWO_TIMES_PER_WEEK = new Frequency(2, 7);
-
-    public static final Frequency WEEKLY = new Frequency(1, 7);
-
-    private final int numerator;
-
-    private final int denominator;
-
-    public Frequency(int numerator, int denominator)
-    {
-        if (numerator == denominator) numerator = denominator = 1;
-
-        this.numerator = numerator;
-        this.denominator = denominator;
-    }
-
-    @Override
-    public boolean equals(Object o)
-    {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
-
-        Frequency frequency = (Frequency) o;
-
-        return new EqualsBuilder()
-            .append(numerator, frequency.numerator)
-            .append(denominator, frequency.denominator)
-            .isEquals();
-    }
-
-    public int getDenominator()
-    {
-        return denominator;
-    }
-
-    public int getNumerator()
-    {
-        return numerator;
-    }
-
-    @Override
-    public int hashCode()
-    {
-        return new HashCodeBuilder(17, 37)
-            .append(numerator)
-            .append(denominator)
-            .toHashCode();
-    }
-
-    public double toDouble()
-    {
-        return (double) numerator / denominator;
-    }
-
-    @Override
-    public String toString()
-    {
-        return new ToStringBuilder(this, defaultToStringStyle())
-            .append("numerator", numerator)
-            .append("denominator", denominator)
-            .toString();
-    }
-}
diff --git a/android/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Frequency.kt b/android/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Frequency.kt
new file mode 100644
index 000000000..237f97247
--- /dev/null
+++ b/android/uhabits-core/src/main/java/org/isoron/uhabits/core/models/Frequency.kt
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Loop Habit Tracker is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.isoron.uhabits.core.models
+
+data class Frequency(
+        var numerator: Int,
+        var denominator: Int,
+) {
+    init {
+        if (numerator == denominator) {
+            denominator = 1
+            numerator = 1
+        }
+    }
+
+    fun toDouble(): Double {
+        return numerator.toDouble() / denominator
+    }
+
+    companion object {
+        @JvmField
+        val DAILY = Frequency(1, 1)
+
+        @JvmField
+        val THREE_TIMES_PER_WEEK = Frequency(3, 7)
+
+        @JvmField
+        val TWO_TIMES_PER_WEEK = Frequency(2, 7)
+
+        @JvmField
+        val WEEKLY = Frequency(1, 7)
+    }
+}
\ No newline at end of file