diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/calendar/CalendarReminderWorker.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/calendar/CalendarReminderWorker.kt
index 4f1f30f7e1..0cb0b6f217 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/calendar/CalendarReminderWorker.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/calendar/CalendarReminderWorker.kt
@@ -29,6 +29,7 @@ import androidx.work.WorkerParameters
 import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.commons.model.nip52Calendar.appointmentView
 import com.vitorpamplona.amethyst.model.LocalCache
+import com.vitorpamplona.amethyst.ui.pluralStringRes
 import com.vitorpamplona.amethyst.ui.stringRes
 import com.vitorpamplona.quartz.nip52Calendar.appt.day.CalendarDateSlotEvent
 import com.vitorpamplona.quartz.nip52Calendar.appt.tags.RSVPStatusTag
@@ -92,9 +93,10 @@ class CalendarReminderWorker(
             val title = view.title ?: stringRes(applicationContext, R.string.calendar_reminder_default_title)
             val minutesAway = ((start - now).coerceAtLeast(0L) / 60L).toInt()
             val body =
-                stringRes(
+                pluralStringRes(
                     applicationContext,
-                    R.string.calendar_reminder_body,
+                    R.plurals.calendar_reminder_body,
+                    minutesAway,
                     minutesAway,
                 )
             val deepLink =
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/types/CalendarCollectionRender.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/types/CalendarCollectionRender.kt
index a25cc86232..f88c033c74 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/types/CalendarCollectionRender.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/types/CalendarCollectionRender.kt
@@ -31,6 +31,7 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
@@ -40,7 +41,6 @@ import com.vitorpamplona.amethyst.commons.icons.symbols.MaterialSymbols
 import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.ui.navigation.navs.INav
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
-import com.vitorpamplona.amethyst.ui.stringRes
 import com.vitorpamplona.amethyst.ui.theme.StdVertSpacer
 import com.vitorpamplona.amethyst.ui.theme.replyModifier
 import com.vitorpamplona.quartz.nip52Calendar.calendar.CalendarEvent
@@ -87,8 +87,9 @@ fun RenderCalendarCollectionEvent(
         }
 
         Spacer(modifier = StdVertSpacer)
+        val eventCount = event.calendarEventAddresses().size
         Text(
-            text = stringRes(R.string.calendar_collection_count, event.calendarEventAddresses().size),
+            text = pluralStringResource(R.plurals.calendar_collection_count, eventCount, eventCount),
             style = MaterialTheme.typography.labelMedium,
             color = MaterialTheme.colorScheme.primary,
             modifier = Modifier.padding(start = 10.dp, end = 10.dp, bottom = 12.dp),
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/calendars/CalendarCollectionsView.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/calendars/CalendarCollectionsView.kt
index 4da24d43e8..359d2b60e4 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/calendars/CalendarCollectionsView.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/calendars/CalendarCollectionsView.kt
@@ -43,6 +43,7 @@ import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
@@ -190,7 +191,7 @@ fun CalendarCollectionCard(
                     )
                 }
                 Text(
-                    text = stringRes(R.string.calendar_collection_count, count),
+                    text = pluralStringResource(R.plurals.calendar_collection_count, count, count),
                     style = MaterialTheme.typography.labelMedium,
                     color = MaterialTheme.colorScheme.primary,
                 )
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/calendars/detail/CalendarEventDetailScreen.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/calendars/detail/CalendarEventDetailScreen.kt
index b304da4efd..e7de2dd865 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/calendars/detail/CalendarEventDetailScreen.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/calendars/detail/CalendarEventDetailScreen.kt
@@ -55,6 +55,7 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
@@ -460,7 +461,7 @@ private fun CollectionMembersSection(
     nav: INav,
 ) {
     Column(modifier = Modifier.padding(horizontal = 16.dp), verticalArrangement = Arrangement.spacedBy(8.dp)) {
-        SectionTitle(stringRes(R.string.calendar_collection_count, memberAddresses.size))
+        SectionTitle(pluralStringResource(R.plurals.calendar_collection_count, memberAddresses.size, memberAddresses.size))
         if (memberAddresses.isEmpty()) {
             Text(
                 text = stringRes(R.string.calendar_collection_empty_members),
diff --git a/amethyst/src/main/res/CLAUDE.md b/amethyst/src/main/res/CLAUDE.md
new file mode 100644
index 0000000000..f3da508b02
--- /dev/null
+++ b/amethyst/src/main/res/CLAUDE.md
@@ -0,0 +1,52 @@
+# String resources — plural handling
+
+Always consider Slavic / Baltic / Semitic / Celtic languages when a string contains a count. The CLDR plural categories `one` / `other` that English uses are **not enough** — these language families decline the noun on `few`, `many`, `two`, `zero`, etc.
+
+## Rules
+
+1. **Any string whose noun changes form with the count must be a `<plurals>` resource, not a `<string>`.** If the English reads naturally as "1 X" vs "N X" with a different noun form, it's a plural.
+2. **The same applies to thresholds** ("more than %1$d hashtags"). The count IS the threshold, and the noun form depends on it in some languages.
+3. **Never hardcode `"1"` in the English text** of a `quantity="one"` item — always use the `%1$d` placeholder. Hardcoding breaks every language whose `one` category covers numbers other than 1 (e.g. some Slavic languages).
+4. **Each locale must include every CLDR category it uses**, not just the categories present in English. Quick reference:
+   - English / German / Swedish / Brazilian Portuguese / Hungarian: `one`, `other`
+   - Czech / Polish / Russian / Ukrainian / Croatian: `one`, `few`, `many`, `other`
+   - Arabic: `zero`, `one`, `two`, `few`, `many`, `other`
+   - Chinese / Japanese: `other` only
+
+## Anti-patterns to flag
+
+When adding or reviewing strings, flag these:
+
+- `<string name="…">%1$d items</string>` where the noun is countable → should be `<plurals>`.
+- `<item quantity="one">1 reply</item>` → hardcoded `1`, should be `%1$d reply`.
+- A locale `strings.xml` providing only `one`/`other` for Polish / Czech / Russian → missing `few`/`many`, will silently fall through to `other` for counts 2–4, 22–24, etc.
+
+## Call-site patterns
+
+In a `@Composable`:
+
+```kotlin
+import androidx.compose.ui.res.pluralStringResource
+// ...
+val n = items.size
+Text(pluralStringResource(R.plurals.foo, n, n))
+```
+
+Pass the count **twice**: once as the CLDR selector, once as the `%1$d` format arg. Hoist the count to a local `val` if computing it is non-trivial (lists, mapNotNull, etc.) — the API forces two reads and you don't want two allocations.
+
+Outside Compose (Workers, callbacks, services), use the project helper:
+
+```kotlin
+import com.vitorpamplona.amethyst.ui.pluralStringRes
+// ...
+pluralStringRes(ctx, R.plurals.foo, count, count)
+```
+
+Defined in `amethyst/src/main/java/com/vitorpamplona/amethyst/ui/StringResourceCache.kt` — wraps `ctx.resources.getQuantityString(id, count, *formatArgs)`.
+
+## Workflow for new count strings
+
+1. Add the new `<plurals>` to default `values/strings.xml` with `one` + `other`.
+2. If you're also adding a locale-specific translation (e.g. zh-rCN, pl-rPL), add it as `<plurals>` with at least `other`. Crowdin will fan out to all CLDR categories for that locale.
+3. If you're **converting** an existing `<string>` to `<plurals>`, you **must** convert it in every locale that already had the `<string>` — otherwise aapt2 will fail with a resource-type mismatch. Use `<plurals>` with `other` only to preserve existing translation (Crowdin fills the rest).
+4. Reference: [Android `<plurals>` docs](https://developer.android.com/guide/topics/resources/string-resource#Plurals) and [CLDR plural rules](https://unicode-org.github.io/cldr-staging/charts/latest/supplemental/language_plural_rules.html).
diff --git a/amethyst/src/main/res/values-hu-rHU/strings.xml b/amethyst/src/main/res/values-hu-rHU/strings.xml
index 301b09836c..50f121cc3f 100644
--- a/amethyst/src/main/res/values-hu-rHU/strings.xml
+++ b/amethyst/src/main/res/values-hu-rHU/strings.xml
@@ -1729,7 +1729,9 @@
     <string name="calendar_collection_title">Cím</string>
     <string name="calendar_collection_description">Leírás</string>
     <string name="calendar_collection_invalid">A cím megadása kötelező.</string>
-    <string name="calendar_collection_count">%1$d esemény</string>
+    <plurals name="calendar_collection_count">
+        <item quantity="other">%1$d esemény</item>
+    </plurals>
     <string name="calendar_collection_empty_members">Ebben a naptárban még nincsenek események.</string>
     <string name="calendar_rsvp_going">Ott leszek</string>
     <string name="calendar_rsvp_maybe">Talán</string>
@@ -1748,7 +1750,9 @@
     <string name="calendar_reminder_channel_name">Naptár-emlékeztetők</string>
     <string name="calendar_reminder_channel_description">Értesítés, ha egy esemény, amin Ön részt vesz, hamarosan elkezdődik.</string>
     <string name="calendar_reminder_default_title">Naptáresemény</string>
-    <string name="calendar_reminder_body">%1$d perc múlva kezdődik</string>
+    <plurals name="calendar_reminder_body">
+        <item quantity="other">%1$d perc múlva kezdődik</item>
+    </plurals>
     <string name="calendar_add_to_calendar_action">Vegye fel az egyik naptárba</string>
     <string name="calendar_add_to_calendar_title">Hozzáadás egy naptárhoz</string>
     <string name="calendar_add_to_calendar_none">Ön még nem hozott létre egyetlen naptárat sem.</string>
diff --git a/amethyst/src/main/res/values-pl-rPL/strings.xml b/amethyst/src/main/res/values-pl-rPL/strings.xml
index 99ad57294b..5e504ddfdd 100644
--- a/amethyst/src/main/res/values-pl-rPL/strings.xml
+++ b/amethyst/src/main/res/values-pl-rPL/strings.xml
@@ -1741,7 +1741,9 @@ Zaplanowane posty z innych kont nie zostaną opublikowane, dopóki to konto jest
     <string name="calendar_collection_title">Tytuł</string>
     <string name="calendar_collection_description">Opis</string>
     <string name="calendar_collection_invalid">Tytuł jest wymagany.</string>
-    <string name="calendar_collection_count">Wydarzeń: %1$d</string>
+    <plurals name="calendar_collection_count">
+        <item quantity="other">Wydarzeń: %1$d</item>
+    </plurals>
     <string name="calendar_collection_empty_members">Brak wydarzeń w tym kalendarzu.</string>
     <string name="calendar_rsvp_going">Będę</string>
     <string name="calendar_rsvp_maybe">Może</string>
@@ -1760,7 +1762,9 @@ Zaplanowane posty z innych kont nie zostaną opublikowane, dopóki to konto jest
     <string name="calendar_reminder_channel_name">Przypomnienia w kalendarzu</string>
     <string name="calendar_reminder_channel_description">Powiadomienie, gdy wydarzenie, w którym bierzesz udział, ma się właśnie rozpocząć.</string>
     <string name="calendar_reminder_default_title">Wydarzenie w kalendarzu</string>
-    <string name="calendar_reminder_body">Rozpoczęcie za %1$d min.</string>
+    <plurals name="calendar_reminder_body">
+        <item quantity="other">Rozpoczęcie za %1$d min.</item>
+    </plurals>
     <string name="calendar_add_to_calendar_action">Dodaj do jednego z kalendarzy</string>
     <string name="calendar_add_to_calendar_title">Dodaj do kalendarza</string>
     <string name="calendar_add_to_calendar_none">Nie utworzyłeś jeszcze żadnych kalendarzy.</string>
diff --git a/amethyst/src/main/res/values-zh-rCN/strings.xml b/amethyst/src/main/res/values-zh-rCN/strings.xml
index 363484afde..a900073a34 100644
--- a/amethyst/src/main/res/values-zh-rCN/strings.xml
+++ b/amethyst/src/main/res/values-zh-rCN/strings.xml
@@ -1721,7 +1721,9 @@
     <string name="calendar_collection_title">标题</string>
     <string name="calendar_collection_description">描述</string>
     <string name="calendar_collection_invalid">标题是必需的。</string>
-    <string name="calendar_collection_count">%1$d 个活动</string>
+    <plurals name="calendar_collection_count">
+        <item quantity="other">%1$d 个活动</item>
+    </plurals>
     <string name="calendar_collection_empty_members">此日历中尚无活动。</string>
     <string name="calendar_rsvp_going">参加</string>
     <string name="calendar_rsvp_maybe">可能</string>
@@ -1740,7 +1742,9 @@
     <string name="calendar_reminder_channel_name">日历提醒</string>
     <string name="calendar_reminder_channel_description">您正参加的活动即将开始时进行提醒。</string>
     <string name="calendar_reminder_default_title">日历活动</string>
-    <string name="calendar_reminder_body">在 %1$d 分钟内开始</string>
+    <plurals name="calendar_reminder_body">
+        <item quantity="other">在 %1$d 分钟内开始</item>
+    </plurals>
     <string name="calendar_add_to_calendar_action">添加到您日历中的一个</string>
     <string name="calendar_add_to_calendar_title">添加到日历</string>
     <string name="calendar_add_to_calendar_none">您尚未创建任何日历。</string>
diff --git a/amethyst/src/main/res/values/strings.xml b/amethyst/src/main/res/values/strings.xml
index a4f33e0697..5f2c6fe9c3 100644
--- a/amethyst/src/main/res/values/strings.xml
+++ b/amethyst/src/main/res/values/strings.xml
@@ -1950,7 +1950,10 @@
     <string name="calendar_collection_title">Title</string>
     <string name="calendar_collection_description">Description</string>
     <string name="calendar_collection_invalid">A title is required.</string>
-    <string name="calendar_collection_count">%1$d events</string>
+    <plurals name="calendar_collection_count">
+        <item quantity="one">%1$d event</item>
+        <item quantity="other">%1$d events</item>
+    </plurals>
     <string name="calendar_collection_empty_members">No events in this calendar yet.</string>
 
     <string name="calendar_rsvp_going">Going</string>
@@ -1970,7 +1973,10 @@
     <string name="calendar_reminder_channel_name">Calendar reminders</string>
     <string name="calendar_reminder_channel_description">Heads-up when an event you\'re attending is about to start.</string>
     <string name="calendar_reminder_default_title">Calendar event</string>
-    <string name="calendar_reminder_body">Starts in %1$d minutes</string>
+    <plurals name="calendar_reminder_body">
+        <item quantity="one">Starts in %1$d minute</item>
+        <item quantity="other">Starts in %1$d minutes</item>
+    </plurals>
     <string name="calendar_add_to_calendar_action">Add to one of your calendars</string>
     <string name="calendar_add_to_calendar_title">Add to a calendar</string>
     <string name="calendar_add_to_calendar_none">You haven\'t created any calendars yet.</string>