diff --git a/src/client/components/website/MetricCard.tsx b/src/client/components/website/MetricCard.tsx
index 3713a5b..21bf65c 100644
--- a/src/client/components/website/MetricCard.tsx
+++ b/src/client/components/website/MetricCard.tsx
@@ -1,9 +1,11 @@
 import { Tag } from 'antd';
 import React from 'react';
 import { formatNumber } from '../../utils/common';
+import { useGlobalStateStore } from '../../store/global';
 
 interface MetricCardProps {
   value?: number;
+  prev?: number;
   change?: number;
   label: string;
   reverseColors?: boolean;
@@ -13,12 +15,16 @@ interface MetricCardProps {
 export const MetricCard: React.FC<MetricCardProps> = React.memo((props) => {
   const {
     value = 0,
+    prev = 0,
     change = 0,
     label,
     reverseColors = false,
     format = formatNumber,
     hideComparison = false,
   } = props;
+  const showPreviousPeriod = useGlobalStateStore(
+    (state) => state.showPreviousPeriod
+  );
 
   return (
     <div className="flex flex-col justify-center min-w-[140px] min-h-[90px]">
@@ -26,14 +32,25 @@ export const MetricCard: React.FC<MetricCardProps> = React.memo((props) => {
         {format(value)}
       </div>
       <div className="flex items-center whitespace-nowrap font-bold">
-        <span className="mr-2">{label}</span>
-        {~~change !== 0 && !hideComparison && (
+        <span className="mr-2 capitalize">{label}</span>
+        {change !== 0 && !hideComparison && (
           <Tag color={change * (reverseColors ? -1 : 1) >= 0 ? 'green' : 'red'}>
             {change > 0 && '+'}
             {format(change)}
           </Tag>
         )}
       </div>
+
+      {showPreviousPeriod && (
+        <div className="mt-2 lg:mt-4 opacity-60">
+          <div className="flex items-center whitespace-nowrap font-bold text-4xl">
+            {format(prev)}
+          </div>
+          <div className="flex items-center whitespace-nowrap font-bold">
+            <span className="mr-2">Previous {label}</span>
+          </div>
+        </div>
+      )}
     </div>
   );
 });
diff --git a/src/client/components/website/WebsiteOverview.tsx b/src/client/components/website/WebsiteOverview.tsx
index c3f0772..8b41355 100644
--- a/src/client/components/website/WebsiteOverview.tsx
+++ b/src/client/components/website/WebsiteOverview.tsx
@@ -1,4 +1,4 @@
-import { Button, message, Spin } from 'antd';
+import { Button, message, Spin, Switch } from 'antd';
 import React, { useMemo } from 'react';
 import { Column, ColumnConfig } from '@ant-design/charts';
 import { SyncOutlined } from '@ant-design/icons';
@@ -23,6 +23,7 @@ import { MonitorHealthBar } from '../monitor/MonitorHealthBar';
 import { useNavigate } from 'react-router';
 import { AppRouterOutput, trpc } from '../../api/trpc';
 import { getUserTimezone } from '../../api/model/user';
+import { useGlobalStateStore } from '../../store/global';
 
 export const WebsiteOverview: React.FC<{
   website: WebsiteInfo;
@@ -32,6 +33,9 @@ export const WebsiteOverview: React.FC<{
   const { website, showDateFilter = false, actions } = props;
   const { startDate, endDate, unit, refresh } = useGlobalRangeDate();
   const navigate = useNavigate();
+  const showPreviousPeriod = useGlobalStateStore(
+    (state) => state.showPreviousPeriod
+  );
 
   const {
     pageviews,
@@ -113,7 +117,19 @@ export const WebsiteOverview: React.FC<{
       <div className="flex mb-10 flex-wrap justify-between">
         <div className="flex-1">{stats && <MetricsBar stats={stats} />}</div>
 
-        <div className="flex items-center gap-2 justify-end w-full lg:w-1/3">
+        <div className="flex items-center gap-2 justify-end flex-wrap w-full lg:w-1/3">
+          <div className="mr-2">
+            <Switch
+              checked={showPreviousPeriod}
+              onChange={(checked) =>
+                useGlobalStateStore.setState({
+                  showPreviousPeriod: checked,
+                })
+              }
+            />
+            <span className="ml-1">Previous period</span>
+          </div>
+
           <Button
             size="large"
             icon={<SyncOutlined />}
@@ -140,51 +156,51 @@ export const MetricsBar: React.FC<{
   stats: AppRouterOutput['website']['stats'];
 }> = React.memo((props) => {
   const { pageviews, uniques, bounces, totaltime } = props.stats || {};
-  const num = Math.min(uniques.value, bounces.value);
-  const diffs = {
-    pageviews: pageviews.value - pageviews.change,
-    uniques: uniques.value - uniques.change,
-    bounces: bounces.value - bounces.change,
-    totaltime: totaltime.value - totaltime.change,
-  };
+  const bouncesNum = Math.min(uniques.value, bounces.value) / uniques.value;
+  const prevBouncesNum = Math.min(uniques.prev, bounces.prev) / uniques.prev;
 
   return (
     <div className="flex gap-5 flex-wrap w-full">
       <MetricCard
-        label="Views"
+        label="views"
         value={pageviews.value}
-        change={pageviews.change}
+        prev={pageviews.prev}
+        change={pageviews.value - pageviews.prev}
       />
       <MetricCard
-        label="Visitors"
+        label="visitors"
         value={uniques.value}
-        change={uniques.change}
+        prev={uniques.prev}
+        change={uniques.value - uniques.prev}
       />
       <MetricCard
-        label="Bounce rate"
+        label="bounce rate"
         reverseColors={true}
-        value={uniques.value ? (num / uniques.value) * 100 : 0}
+        value={uniques.value ? bouncesNum * 100 : 0}
+        prev={uniques.prev ? prevBouncesNum * 100 : 0}
         change={
-          uniques.value && uniques.change
-            ? (num / uniques.value) * 100 -
-                (Math.min(diffs.uniques, diffs.bounces) / diffs.uniques) *
-                  100 || 0
+          uniques.value && uniques.prev
+            ? bouncesNum * 100 - prevBouncesNum * 100 || 0
             : 0
         }
         format={(n) => formatNumber(n) + '%'}
       />
       <MetricCard
-        label="Average visit time"
+        label="average visit time"
         value={
           totaltime.value && pageviews.value
             ? totaltime.value / (pageviews.value - bounces.value)
             : 0
         }
+        prev={
+          totaltime.prev && pageviews.prev
+            ? totaltime.prev / (pageviews.prev - bounces.prev)
+            : 0
+        }
         change={
           totaltime.value && pageviews.value
-            ? (diffs.totaltime / (diffs.pageviews - diffs.bounces) -
-                totaltime.value / (pageviews.value - bounces.value)) *
-                -1 || 0
+            ? totaltime.value / (pageviews.value - bounces.value) -
+                totaltime.prev / (pageviews.prev - bounces.prev) || 0
             : 0
         }
         format={(n) =>
diff --git a/src/client/store/global.ts b/src/client/store/global.ts
index e63ea14..d9828c9 100644
--- a/src/client/store/global.ts
+++ b/src/client/store/global.ts
@@ -18,10 +18,12 @@ interface GlobalState {
   dateRange: DateRange;
   startDate: Dayjs | null;
   endDate: Dayjs | null;
+  showPreviousPeriod: boolean;
 }
 
 export const useGlobalStateStore = create<GlobalState>(() => ({
   dateRange: DateRange.Last24Hours,
   startDate: null,
   endDate: null,
+  showPreviousPeriod: false,
 }));
diff --git a/src/server/model/_schema/filter.ts b/src/server/model/_schema/filter.ts
index 911530e..f21810f 100644
--- a/src/server/model/_schema/filter.ts
+++ b/src/server/model/_schema/filter.ts
@@ -15,7 +15,7 @@ export const websiteFilterSchema = z.object({
 
 const websiteStatsItemType = z.object({
   value: z.number(),
-  change: z.number(),
+  prev: z.number(),
 });
 
 export const websiteStatsSchema = z.object({
diff --git a/src/server/model/monitor/provider/http.ts b/src/server/model/monitor/provider/http.ts
index 0c92c48..593f791 100644
--- a/src/server/model/monitor/provider/http.ts
+++ b/src/server/model/monitor/provider/http.ts
@@ -91,7 +91,7 @@ export const http: MonitorProvider<{
 
       return diff;
     } catch (err) {
-      logger.error('run monitor http error', String(err));
+      logger.error(`run monitor(${monitor.id}) http error`, String(err));
       return -1;
     }
   },
diff --git a/src/server/trpc/routers/website.ts b/src/server/trpc/routers/website.ts
index 700d112..ecac631 100644
--- a/src/server/trpc/routers/website.ts
+++ b/src/server/trpc/routers/website.ts
@@ -178,12 +178,14 @@ export const websiteRouter = router({
       ]);
 
       const stats = Object.keys(metrics[0]).reduce((obj, key) => {
+        const current = Number(metrics[0][key]) || 0;
+        const prev = Number(prevPeriod[0][key]) || 0;
         obj[key] = {
-          value: Number(metrics[0][key]) || 0,
-          change: Number(metrics[0][key]) - Number(prevPeriod[0][key]) || 0,
+          value: current,
+          prev,
         };
         return obj;
-      }, {} as Record<string, { value: number; change: number }>);
+      }, {} as Record<string, { value: number; prev: number }>);
 
       return websiteStatsSchema.parse(stats);
     }),