diff --git a/data/src/noAnalytics/java/com/moez/QKSMS/manager/AnalyticsManagerImpl.kt b/data/src/noAnalytics/java/com/moez/QKSMS/manager/AnalyticsManagerImpl.kt
index 91c1be14..772c3ea3 100644
--- a/data/src/noAnalytics/java/com/moez/QKSMS/manager/AnalyticsManagerImpl.kt
+++ b/data/src/noAnalytics/java/com/moez/QKSMS/manager/AnalyticsManagerImpl.kt
@@ -36,7 +36,7 @@ class AnalyticsManagerImpl @Inject constructor() : AnalyticsManager {
     }
 
     override fun setUserProperty(key: String, value: Any) {
-        // Do nothing
+        Timber.v("$key: $value")
     }
 
 }
diff --git a/data/src/withAnalytics/java/com/moez/QKSMS/manager/AnalyticsManagerImpl.kt b/data/src/withAnalytics/java/com/moez/QKSMS/manager/AnalyticsManagerImpl.kt
index 4fb14b2c..edf36498 100644
--- a/data/src/withAnalytics/java/com/moez/QKSMS/manager/AnalyticsManagerImpl.kt
+++ b/data/src/withAnalytics/java/com/moez/QKSMS/manager/AnalyticsManagerImpl.kt
@@ -54,6 +54,7 @@ class AnalyticsManagerImpl @Inject constructor(context: Context) : AnalyticsMana
     }
 
     override fun setUserProperty(key: String, value: Any) {
+        Timber.v("$key: $value")
 
         // Set the value in Mixpanel
         val properties = JSONObject()
diff --git a/domain/src/main/java/com/moez/QKSMS/experiment/Experiment.kt b/domain/src/main/java/com/moez/QKSMS/experiment/Experiment.kt
new file mode 100644
index 00000000..d8deb23e
--- /dev/null
+++ b/domain/src/main/java/com/moez/QKSMS/experiment/Experiment.kt
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2017 Moez Bhatti <moez.bhatti@gmail.com>
+ *
+ * This file is part of QKSMS.
+ *
+ * QKSMS 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.
+ *
+ * QKSMS 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 QKSMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.moez.QKSMS.experiment
+
+import android.content.Context
+import android.preference.PreferenceManager
+import com.moez.QKSMS.manager.AnalyticsManager
+import java.util.*
+
+abstract class Experiment<T>(val context: Context, val analytics: AnalyticsManager) {
+
+    private val prefs by lazy { PreferenceManager.getDefaultSharedPreferences(context) }
+    private val prefKey: String
+        get() = "experiment_$key"
+
+    protected abstract val key: String
+    protected abstract val variants: List<Variant<T>>
+    protected abstract val default: T
+
+    /**
+     * Returns true if the current device qualifies for the experiment
+     */
+    protected open val qualifies: Boolean = Locale.getDefault().language == "en"
+
+    val variant: Variant<T> by lazy {
+        when {
+            !qualifies -> null // Device doesn't quality for experiment
+
+            prefs.contains(prefKey) -> { // Variant already set
+                variants.firstOrNull { it.key == prefs.getString(prefKey, null) }
+            }
+
+            else -> { // Variant hasn't been set yet
+                variants[Random().nextInt(variants.size)].also { variant ->
+                    analytics.setUserProperty("Experiment: $key", variant.key)
+                    prefs.edit().putString(prefKey, variant.key).apply()
+                }
+            }
+        } ?: Variant("default", default)
+    }
+
+}
\ No newline at end of file
diff --git a/domain/src/main/java/com/moez/QKSMS/experiment/Variant.kt b/domain/src/main/java/com/moez/QKSMS/experiment/Variant.kt
new file mode 100644
index 00000000..0d7d5df6
--- /dev/null
+++ b/domain/src/main/java/com/moez/QKSMS/experiment/Variant.kt
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2017 Moez Bhatti <moez.bhatti@gmail.com>
+ *
+ * This file is part of QKSMS.
+ *
+ * QKSMS 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.
+ *
+ * QKSMS 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 QKSMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.moez.QKSMS.experiment
+
+data class Variant<T>(val key: String, val value: T)
\ No newline at end of file
diff --git a/presentation/src/main/java/com/moez/QKSMS/feature/plus/PlusActivity.kt b/presentation/src/main/java/com/moez/QKSMS/feature/plus/PlusActivity.kt
index ceb33c9d..d7a8d1f0 100644
--- a/presentation/src/main/java/com/moez/QKSMS/feature/plus/PlusActivity.kt
+++ b/presentation/src/main/java/com/moez/QKSMS/feature/plus/PlusActivity.kt
@@ -34,6 +34,7 @@ import com.moez.QKSMS.common.util.extensions.setBackgroundTint
 import com.moez.QKSMS.common.util.extensions.setTint
 import com.moez.QKSMS.common.util.extensions.setVisible
 import com.moez.QKSMS.common.widget.PreferenceView
+import com.moez.QKSMS.feature.plus.experiment.UpgradeButtonExperiment
 import dagger.android.AndroidInjection
 import kotlinx.android.synthetic.main.collapsing_toolbar.*
 import kotlinx.android.synthetic.main.preference_view.view.*
@@ -43,6 +44,7 @@ import javax.inject.Inject
 class PlusActivity : QkThemedActivity(), PlusView {
 
     @Inject lateinit var fontProvider: FontProvider
+    @Inject lateinit var upgradeButtonExperiment: UpgradeButtonExperiment
     @Inject lateinit var viewModelFactory: ViewModelProvider.Factory
 
     private val viewModel by lazy { ViewModelProviders.of(this, viewModelFactory)[PlusViewModel::class.java] }
@@ -87,7 +89,7 @@ class PlusActivity : QkThemedActivity(), PlusView {
 
     override fun render(state: PlusState) {
         description.text = getString(R.string.qksms_plus_description_summary, state.upgradePrice)
-        upgrade.text = getString(R.string.qksms_plus_upgrade, state.upgradePrice, state.currency)
+        upgrade.text = getString(upgradeButtonExperiment.variant.value, state.upgradePrice, state.currency)
         upgradeDonate.text = getString(R.string.qksms_plus_upgrade_donate, state.upgradeDonatePrice, state.currency)
 
         val fdroid = BuildConfig.FLAVOR == "noAnalytics"
diff --git a/presentation/src/main/java/com/moez/QKSMS/feature/plus/experiment/UpgradeButtonExperiment.kt b/presentation/src/main/java/com/moez/QKSMS/feature/plus/experiment/UpgradeButtonExperiment.kt
new file mode 100644
index 00000000..568e541b
--- /dev/null
+++ b/presentation/src/main/java/com/moez/QKSMS/feature/plus/experiment/UpgradeButtonExperiment.kt
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2017 Moez Bhatti <moez.bhatti@gmail.com>
+ *
+ * This file is part of QKSMS.
+ *
+ * QKSMS 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.
+ *
+ * QKSMS 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 QKSMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.moez.QKSMS.feature.plus.experiment
+
+import android.content.Context
+import androidx.annotation.StringRes
+import com.moez.QKSMS.R
+import com.moez.QKSMS.experiment.Experiment
+import com.moez.QKSMS.experiment.Variant
+import com.moez.QKSMS.manager.AnalyticsManager
+import javax.inject.Inject
+
+class UpgradeButtonExperiment @Inject constructor(
+        context: Context,
+        analytics: AnalyticsManager
+) : Experiment<@StringRes Int>(context, analytics) {
+
+    override val key: String = "Upgrade Button"
+
+    override val variants: List<Variant<Int>> = listOf(
+            Variant("variant_a", R.string.qksms_plus_upgrade),
+            Variant("variant_b", R.string.qksms_plus_upgrade_b),
+            Variant("variant_c", R.string.qksms_plus_upgrade_c),
+            Variant("variant_d", R.string.qksms_plus_upgrade_d))
+
+    override val default: Int = R.string.qksms_plus_upgrade
+
+}
\ No newline at end of file
diff --git a/presentation/src/main/res/values/strings.xml b/presentation/src/main/res/values/strings.xml
index 02b6732f..87e98acd 100644
--- a/presentation/src/main/res/values/strings.xml
+++ b/presentation/src/main/res/values/strings.xml
@@ -228,6 +228,9 @@
     <string name="qksms_plus_description_title">Support development, unlock everything</string>
     <string name="qksms_plus_description_summary">You can save a starving developer for just %s</string>
     <string name="qksms_plus_upgrade">Lifetime upgrade for %1$s %2$s</string>
+    <string name="qksms_plus_upgrade_b">Unlock for %1$s %2$s</string>
+    <string name="qksms_plus_upgrade_c">Unlock forever for %1$s %2$s</string>
+    <string name="qksms_plus_upgrade_d">One-time purchase of %1$s %2$s</string>
     <string name="qksms_plus_upgrade_donate">Unlock + donate for %1$s %2$s</string>
     <string name="qksms_plus_thanks_title">Thank you for supporting QKSMS!</string>
     <string name="qksms_plus_thanks_summary">You now have access to all QKSMS+ features</string>