diff --git a/README.rst b/README.rst
index e39eceb..b0ef6df 100644
--- a/README.rst
+++ b/README.rst
@@ -54,7 +54,7 @@ List slots specifying time range, slot interval, max events per slot and calenda
         case_sensitive=False,
         time_min=datetime(2023, 3, 6),
         time_max=datetime(2023, 3, 7),
-        interval_in_minutes=90,
+        slot_duration=90,
         events_per_slot=3,
         calendar_id=calendar_id,
     ):
diff --git a/gcsa_slots/__init__.py b/gcsa_slots/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/gcsa_slots/google_calendar.py b/gcsa_slots/google_calendar.py
new file mode 100644
index 0000000..b93b914
--- /dev/null
+++ b/gcsa_slots/google_calendar.py
@@ -0,0 +1,9 @@
+from gcsa.google_calendar import GoogleCalendar as _GoogleCalendar
+
+from .slots import Slot, SlotsService
+
+__all__ = ("GoogleCalendar",)
+
+
+class GoogleCalendar(_GoogleCalendar, SlotsService):
+    pass
diff --git a/gcsa_slots/slots.py b/gcsa_slots/slots.py
new file mode 100644
index 0000000..610cb4b
--- /dev/null
+++ b/gcsa_slots/slots.py
@@ -0,0 +1,139 @@
+from typing import List, Iterable, Union, Literal
+from datetime import datetime, date, timedelta
+
+from beautiful_date import BeautifulDate
+from gcsa.google_calendar import EventsService
+from gcsa.event import Event
+from gcsa.util.date_time_util import ensure_localisation
+from tzlocal import get_localzone_name
+
+__all__ = ("Slot", "SlotsService")
+
+
+class Slot(Event):
+    def __init__(
+        self,
+        summary: str,
+        start: Union[date, datetime, BeautifulDate],
+        end: Union[date, datetime, BeautifulDate] = None,
+        *,
+        timezone: str = get_localzone_name(),
+        events_per_slot: int = 1,
+        **kwargs,
+    ):
+        self.events_per_slot = events_per_slot
+        self._events = 0
+        super().__init__(summary, start, end, timezone=timezone, **kwargs)
+
+    def __str__(self):
+        return '{} - {}'.format(self.start, self.end)
+
+    def __repr__(self):
+        return '<Slot {}>'.format(self.__str__())
+
+    def __eq__(self, other):
+        return (
+            isinstance(other, Slot)
+            and self.summary == other.summary
+            and self.start == other.start
+            and self.end == other.end
+            and self.timezone == other.timezone
+            and self.events_per_slot == other.events_per_slot
+        )
+
+
+class SlotsService(EventsService):
+
+    def get_slots(
+        self,
+        slot_summary: str = None,
+        slot_duration: Union[int, timedelta] = 60,  # in minutes
+        time_min: Union[date, datetime, BeautifulDate] = datetime.utcnow(),
+        time_max: Union[date, datetime, BeautifulDate] = datetime.utcnow() + timedelta(days=7),
+        calendar_id: str = None,
+        case_sensitive: bool = True,
+        events_per_slot: int = 1,
+        timezone: str = get_localzone_name(),
+        **kwargs,
+    ) -> Iterable[Slot]:
+        kwargs.pop("query", None)
+        slots = []
+
+        if slot_summary:
+            for event in self.get_events(
+                time_min=time_min,
+                time_max=time_max,
+                order_by="startTime",
+                timezone=timezone,
+                single_events=True,
+                query=slot_summary,
+                calendar_id=calendar_id,
+            ):
+                if (
+                    (case_sensitive and event.summary != slot_summary)
+                    or (not case_sensitive and event.summary.lower() != slot_summary.lower())
+                ):
+                    continue
+                if isinstance(event.start, datetime):
+                    start_datetime = event.start
+                elif isinstance(event.start, date):
+                    start_datetime = datetime.combine(event.start, datetime.min.time())
+                if isinstance(event.end, datetime):
+                    end_datetime = event.end
+                elif isinstance(event.end, date):
+                    end_datetime = datetime.combine(event.end, datetime.max.time())
+                delta = end_datetime - start_datetime
+                delta_minutes = int(delta.total_seconds() / 60)
+                if delta_minutes < slot_duration:
+                    continue
+                for i in range(0, delta_minutes, slot_duration):
+                    start = start_datetime + timedelta(minutes=i)
+                    end = start + timedelta(minutes=slot_duration)
+                    if end > end_datetime:
+                        break
+                    slot = Slot(
+                        summary=slot_summary,
+                        start=start,
+                        end=end,
+                        timezone=event.timezone,
+                        events_per_slot=events_per_slot,
+                    )
+                    if slot not in slots:
+                        slots.append(slot)
+        else:
+            delta = time_max - time_min
+            delta_minutes = int(delta.total_seconds() / 60)
+            if delta_minutes >= slot_duration:
+                for i in range(0, delta_minutes, slot_duration):
+                    start = time_min + timedelta(minutes=i)
+                    end = start + timedelta(minutes=slot_duration)
+                    if end > time_max:
+                        break
+                    slot = Slot(
+                        summary=slot_summary,
+                        start=start,
+                        end=end,
+                        timezone=timezone,
+                        events_per_slot=events_per_slot,
+                    )
+                    if slot not in slots:
+                        slots.append(slot)
+
+        if slots:
+            for event in self.get_events(single_events=True, order_by="startTime", calendar_id=calendar_id):
+                if (
+                    (case_sensitive and event.summary == slot_summary)
+                    or (not case_sensitive and event.summary.lower() == slot_summary.lower())
+                ):
+                    continue
+                for slot in slots:
+                    if slot.start.day > event.start.day:
+                        break
+                    elif slot.start.day < event.start.day:
+                        continue
+                    elif event.start <= slot.start < event.end or event.start < slot.end <= event.end:
+                        slot._events += 1
+            slots = [slot for slot in slots if slot._events < slot.events_per_slot]
+            slots.sort()
+
+        return iter(slots)