diff --git a/pkg/cli/compile_schedule_calendar.go b/pkg/cli/compile_schedule_calendar.go
index b7a4d805ffd..ee2b9b9d44c 100644
--- a/pkg/cli/compile_schedule_calendar.go
+++ b/pkg/cli/compile_schedule_calendar.go
@@ -11,7 +11,7 @@ import (
 	"strconv"
 	"strings"
 
-	lipgloss "charm.land/lipgloss/v2"
+	"github.com/github/gh-aw/pkg/colorwriter"
 	"github.com/github/gh-aw/pkg/console"
 	"github.com/github/gh-aw/pkg/styles"
 	"github.com/github/gh-aw/pkg/tty"
@@ -195,14 +195,17 @@ func intensityChar(count int) string {
 	}
 }
 
-// intensityStyle returns a lipgloss style appropriate for the given trigger
-// count. Styling is TTY-gated so non-interactive output does not emit ANSI.
-func intensityStyle(count int, isTerminal bool) lipgloss.Style {
-	if !isTerminal {
-		// Keep glyph rendering unchanged while preventing ANSI escapes in piped output.
-		return lipgloss.NewStyle()
-	}
+// scheduleCalendarRenderer abstracts the shared Render method implemented by
+// both lipgloss.Style (normal builds) and styles.WasmStyle (js/wasm builds).
+// Using this interface keeps intensityStyle free of a concrete lipgloss.Style
+// return type that would fail to compile for wasm style tokens.
+type scheduleCalendarRenderer interface {
+	Render(...string) string
+}
 
+// intensityStyle returns a centralized style appropriate for the given trigger
+// count.
+func intensityStyle(count int) scheduleCalendarRenderer {
 	switch {
 	case count == 0:
 		return styles.ScheduleCalendarEmpty
@@ -217,6 +220,13 @@ func intensityStyle(count int, isTerminal bool) lipgloss.Style {
 	}
 }
 
+func renderScheduleCalendarCell(count int, text string, isTerminal bool, environ []string) string {
+	if !isTerminal || console.IsAccessibleMode() {
+		return text
+	}
+	return colorwriter.Degrade(intensityStyle(count).Render(text), environ)
+}
+
 // displayScheduleCalendar renders a text heatmap of scheduled workflow times to
 // stderr. The grid shows days of the week (Mon–Sun) against hours of the day
 // (00–23, UTC). Each cell intensity indicates how many workflows fire at that
@@ -231,6 +241,7 @@ func displayScheduleCalendar(statsList []*WorkflowStats) {
 	}
 
 	isTerminal := tty.IsStderrTerminal()
+	environ := os.Environ()
 
 	// Title
 	fmt.Fprintln(os.Stderr)
@@ -263,7 +274,7 @@ func displayScheduleCalendar(statsList []*WorkflowStats) {
 			ch := intensityChar(count)
 			// Pad each cell to cellWidth with a trailing space.
 			cell := ch + strings.Repeat(" ", cellWidth-len([]rune(ch)))
-			row.WriteString(intensityStyle(count, isTerminal).Render(cell))
+			row.WriteString(renderScheduleCalendarCell(count, cell, isTerminal, environ))
 		}
 
 		fmt.Fprintln(os.Stderr, row.String())
@@ -281,7 +292,7 @@ func displayScheduleCalendar(statsList []*WorkflowStats) {
 	legend.WriteString("Legend: ")
 	for _, e := range entries {
 		ch := intensityChar(e.count)
-		legend.WriteString(intensityStyle(e.count, isTerminal).Render(ch))
+		legend.WriteString(renderScheduleCalendarCell(e.count, ch, isTerminal, environ))
 		legend.WriteString(" = " + e.label + "   ")
 	}
 	fmt.Fprintln(os.Stderr, legend.String())
diff --git a/pkg/cli/compile_schedule_calendar_test.go b/pkg/cli/compile_schedule_calendar_test.go
index fb399b7c833..ba9a3e0ffe4 100644
--- a/pkg/cli/compile_schedule_calendar_test.go
+++ b/pkg/cli/compile_schedule_calendar_test.go
@@ -9,7 +9,9 @@ import (
 	"strings"
 	"testing"
 
+	lipgloss "charm.land/lipgloss/v2"
 	"github.com/github/gh-aw/pkg/parser"
+	"github.com/github/gh-aw/pkg/styles"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -205,13 +207,39 @@ func TestIntensityChar(t *testing.T) {
 	}
 }
 
-func TestIntensityStyle_NoANSIWhenNotTerminal(t *testing.T) {
+func TestRenderScheduleCalendarCell_NoANSIWhenNotTerminal(t *testing.T) {
 	for _, count := range []int{0, 1, 2, 5, 8} {
-		got := intensityStyle(count, false).Render(intensityChar(count))
-		assert.NotContains(t, got, "\x1b[", "non-TTY output should not contain ANSI escapes")
+		text := intensityChar(count)
+		got := renderScheduleCalendarCell(count, text, false, []string{"TERM=xterm-256color"})
+		assert.Equal(t, text, got, "non-TTY output should return plain text")
 	}
 }
 
+func TestRenderScheduleCalendarCell_NoANSIWhenNoColor(t *testing.T) {
+	for _, count := range []int{0, 1, 2, 5, 8} {
+		text := intensityChar(count)
+		got := renderScheduleCalendarCell(count, text, true, []string{"NO_COLOR=1", "TERM=xterm-256color"})
+		assert.Equal(t, text, got, "NO_COLOR output should return plain text")
+	}
+}
+
+func TestRenderScheduleCalendarCell_UsesANSIInColorTerminal(t *testing.T) {
+	// This test intentionally avoids t.Parallel because it temporarily overrides
+	// a shared style token; running in parallel could race with other tests that
+	// read styles.ScheduleCalendarCritical.
+	prevCritical := styles.ScheduleCalendarCritical
+	styles.ScheduleCalendarCritical = lipgloss.NewStyle().Transform(func(s string) string {
+		return "\x1b[31m" + s + "\x1b[0m"
+	})
+	t.Cleanup(func() {
+		styles.ScheduleCalendarCritical = prevCritical
+	})
+
+	got := renderScheduleCalendarCell(8, intensityChar(8), true, []string{"CLICOLOR_FORCE=1", "TERM=xterm-256color"})
+	assert.Contains(t, got, "\x1b[", "TTY with color support should contain ANSI escapes")
+	assert.Contains(t, got, "\x1b[31m", "TTY path should apply the mocked critical style")
+}
+
 // ---------------------------------------------------------------------------
 // displayScheduleCalendar (integration-style: captures stderr)
 // ---------------------------------------------------------------------------