diff --git a/log_stream.go b/log_stream.go
new file mode 100644
index 0000000..0e188a5
--- /dev/null
+++ b/log_stream.go
@@ -0,0 +1,122 @@
+package mujica
+
+import (
+	"fmt"
+	"log/slog"
+
+	"github.com/egoist/mygo/ui"
+
+	"mujicaui/theme"
+)
+
+// LogStreamState is a LogStream's pause, level filter and place.
+type LogStreamState struct {
+	Paused bool
+	// MinLevel hides lines below it.
+	MinLevel LogLevel
+	// frozen is the line count at pause; lines after it wait.
+	frozen  int
+	shown   []int
+	scanned int
+	min     LogLevel
+	rows    ui.ListState
+}
+
+// LogStreamOptions configure a LogStream.
+type LogStreamOptions struct {
+	// Height of the line well; zero means 320.
+	Height   float32
+	Disabled bool
+}
+
+// LogStream shows live ANSI log lines that follow the end, pause and filter by level, virtualized.
+func LogStream(c *ui.Context, lines []LogLine, s *LogStreamState, opts LogStreamOptions) ChoiceResult {
+	if s == nil {
+		panic("mujica: LogStream needs a state")
+	}
+	if opts.Height < 0 || s.MinLevel < LogDebug || s.MinLevel > LogError {
+		panic("mujica: LogStream needs Height >= 0 and a known MinLevel")
+	}
+	h := opts.Height
+	if h == 0 {
+		h = 320
+	}
+	var r ChoiceResult
+	r.Element = codePanel(c).Disabled(opts.Disabled).Height(h)
+	locked := r.Element.IsDisabled()
+	r.Element.Children(func() {
+		codeHeader(c, func() {
+			was := s.Paused
+			label := msg(c, "log_stream.pause")
+			if s.Paused {
+				label = msg(c, "log_stream.resume")
+			}
+			if Toggle(c, &s.Paused, label, ToggleOptions{Disabled: locked}).Changed() && !locked {
+				r.changed = true
+			} else {
+				s.Paused = was
+			}
+			levels := make([]Segment, 4)
+			for lv := LogDebug; lv <= LogError; lv++ {
+				levels[lv] = Segment{Label: logViewerName(c, lv)}
+			}
+			pick := int(s.MinLevel)
+			SegmentedControl(c, &pick, levels, SegmentedControlOptions{Label: msg(c, "log_stream.level"), Disabled: locked})
+			if LogLevel(pick) != s.MinLevel && !locked {
+				s.MinLevel, r.changed = LogLevel(pick), true
+			}
+			ui.Box(c).Grow(1)
+			if s.Paused && len(lines) > s.frozen {
+				codeCaption(c, fmt.Sprintf(msg(c, "log_stream.waiting"), len(lines)-s.frozen)).Role(ui.RoleStatus)
+			}
+		})
+		if !s.Paused {
+			s.frozen = len(lines)
+		}
+		logStreamFilter(lines[:min(s.frozen, len(lines))], s)
+		if len(s.shown) == 0 {
+			codeCaption(c, msg(c, "log_stream.empty")).Padding(Density(c).Unit() * 4)
+			return
+		}
+		s.rows.FollowEnd = !s.Paused
+		s.rows.Key = func(i int) any { return s.shown[i] }
+		d := Density(c)
+		ui.List(c, &s.rows, len(s.shown), func(i int) { logStreamRow(c, lines[s.shown[i]]) }).Grow(1).Padding(d.Unit(), 0)
+	})
+	if r.changed {
+		slog.Debug("mujica: log_stream change", "paused", s.Paused, "min_level", s.MinLevel)
+	}
+	return r
+}
+
+// logStreamFilter extends the shown lines, or redoes them after a filter change.
+func logStreamFilter(lines []LogLine, s *LogStreamState) {
+	if s.min != s.MinLevel || s.scanned > len(lines) {
+		s.min, s.scanned, s.shown = s.MinLevel, 0, s.shown[:0]
+	}
+	for i := s.scanned; i < len(lines); i++ {
+		lv := lines[i].Level
+		if lv < LogDebug || lv > LogError {
+			panic("mujica: LogLine level out of range")
+		}
+		if lv >= s.MinLevel {
+			s.shown = append(s.shown, i)
+		}
+	}
+	s.scanned = len(lines)
+}
+
+// logStreamRow shows one line: time, level word and ANSI text.
+func logStreamRow(c *ui.Context, l LogLine) {
+	k := Tokens(c)
+	d := Density(c)
+	col := [...]ui.Color{k.TextMuted, k.Info, k.Warning, k.Danger}[l.Level]
+	ui.Row(c).MinHeight(d.ControlHeight() - 8).Padding(0, d.Unit()*3).Gap(d.Unit() * 3).AlignItems(ui.Center).Children(func() {
+		if !l.Time.IsZero() {
+			codeMono(c, l.Time.Format("15:04:05.000")).TextColor(k.TextMuted).Shrink(0)
+		}
+		ui.Text(c, fmt.Sprintf("%-5s", logViewerName(c, l.Level))).Font(theme.MonoFont).FontSize(FontSize(c, codeSize)).
+			FontWeight(700).TextColor(col).SingleLine().Shrink(0)
+		ui.RichText(c, codeAnsiSpans(c, l.Text)...).Font(theme.MonoFont).FontSize(FontSize(c, codeSize)).Grow(1).MinWidth(0)
+	})
+}
diff --git a/log_stream_test.go b/log_stream_test.go
new file mode 100644
index 0000000..782c686
--- /dev/null
+++ b/log_stream_test.go
@@ -0,0 +1,97 @@
+package mujica
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/egoist/mygo/ui"
+)
+
+func logStreamLines(n int) []LogLine {
+	out := make([]LogLine, n)
+	for i := range out {
+		out[i] = LogLine{Level: LogLevel(i % 4), Text: fmt.Sprintf("\x1b[1mline\x1b[0m %d", i)}
+	}
+	return out
+}
+
+func logStreamTester(lines *[]LogLine, s *LogStreamState, opts LogStreamOptions, changes *int) *ui.Tester {
+	return ui.NewTester(func(c *ui.Context) {
+		Use(c, Settings{})
+		if LogStream(c, *lines, s, opts).Changed() {
+			*changes++
+		}
+	}, 700, 400)
+}
+
+func TestLogStreamFollowPauseResume(t *testing.T) {
+	lines := logStreamLines(10)
+	var s LogStreamState
+	n := 0
+	tt := logStreamTester(&lines, &s, LogStreamOptions{}, &n)
+	if !tt.HasText("line 9") || tt.HasText("\x1b[1mline") {
+		t.Fatalf("texts %q", tt.Texts())
+	}
+	_ = tt.Click("Pause")
+	lines = append(lines, logStreamLines(13)[10:]...)
+	tt.Frame()
+	if !s.Paused || tt.HasText("line 12") || !tt.HasText("3 new lines") {
+		t.Fatalf("paused: %q", tt.Texts())
+	}
+	_ = tt.Click("Resume")
+	if s.Paused || !tt.HasText("line 12") || n != 2 {
+		t.Fatalf("resume: %q changes %d", tt.Texts(), n)
+	}
+}
+
+func TestLogStreamLevelFilter(t *testing.T) {
+	lines := logStreamLines(8)
+	var s LogStreamState
+	n := 0
+	tt := logStreamTester(&lines, &s, LogStreamOptions{}, &n)
+	_ = tt.Click("WARN")
+	if s.MinLevel != LogWarn || tt.HasText("line 5") || !tt.HasText("line 6") || !tt.HasText("line 7") {
+		t.Fatalf("filter: %v %q", s.MinLevel, tt.Texts())
+	}
+	tt.Key(0, ui.KeyRight)
+	if s.MinLevel != LogError || tt.HasText("line 6") {
+		t.Fatalf("keyboard filter: %v", s.MinLevel)
+	}
+}
+
+func TestLogStreamDisabledEmptyMany(t *testing.T) {
+	lines := logStreamLines(4)
+	var s LogStreamState
+	n := 0
+	tt := logStreamTester(&lines, &s, LogStreamOptions{Disabled: true}, &n)
+	_ = tt.Click("Pause")
+	_ = tt.Click("WARN")
+	if n != 0 || s.Paused || s.MinLevel != LogDebug {
+		t.Fatalf("disabled changed: %+v", s)
+	}
+	none := []LogLine{}
+	tt = logStreamTester(&none, &LogStreamState{}, LogStreamOptions{}, &n)
+	if !tt.HasText("No log lines") {
+		t.Fatal("empty text missing")
+	}
+	many := logStreamLines(100000)
+	var ms LogStreamState
+	tt = logStreamTester(&many, &ms, LogStreamOptions{}, &n)
+	if got := len(tt.Texts()); got > 300 || !tt.HasText("line 99999") {
+		t.Fatalf("%d texts; last line shown %v", got, tt.HasText("line 99999"))
+	}
+}
+
+func TestLogStreamSnapshot(t *testing.T) {
+	lines := []LogLine{
+		{Level: LogInfo, Text: "server listening on :8080"},
+		{Level: LogDebug, Text: "cache warm: 312 keys"},
+		{Level: LogWarn, Text: "slow query \x1b[33m412 ms\x1b[0m on guests"},
+		{Level: LogError, Text: "\x1b[31mpayment provider unreachable\x1b[0m"},
+		{Level: LogInfo, Text: "retry 1 of 3 succeeded"},
+	}
+	snapshot(t, "log_stream", 640, 260, func(c *ui.Context) {
+		var s LogStreamState
+		ui.Column(c).Padding(16).Children(func() { LogStream(c, lines, &s, LogStreamOptions{Height: 220}) })
+	})
+}
diff --git a/messages_devtools.go b/messages_devtools.go
index 8829dd6..c5c325c 100644
--- a/messages_devtools.go
+++ b/messages_devtools.go
@@ -66,6 +66,12 @@ func init() {
 		"dashboard_filter_bar.tags":          {"Tags", "标签"},
 		"dashboard_filter_bar.clear":         {"Clear filters", "清除过滤"},
 
+		"log_stream.pause":   {"Pause", "暂停"},
+		"log_stream.resume":  {"Resume", "继续"},
+		"log_stream.level":   {"Minimum level", "最低级别"},
+		"log_stream.waiting": {"%d new lines", "%d 条新日志"},
+		"log_stream.empty":   {"No log lines", "没有日志"},
+
 		"alert_list.empty": {"No alerts", "没有告警"},
 	})
 }
diff --git a/testdata/snapshots/darwin/log_stream-dark.png b/testdata/snapshots/darwin/log_stream-dark.png
new file mode 100644
index 0000000..64003df
Binary files /dev/null and b/testdata/snapshots/darwin/log_stream-dark.png differ
diff --git a/testdata/snapshots/darwin/log_stream-light.png b/testdata/snapshots/darwin/log_stream-light.png
new file mode 100644
index 0000000..68839db
Binary files /dev/null and b/testdata/snapshots/darwin/log_stream-light.png differ