#657CC9
Closest named color: Cool Blue (#4984B8). oklch(60.3% 0.121 269.9), rgb(101, 124, 201).
Aa
Black text reads best on this color (5.27:1).
About this color
#657CC9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.121 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.048 away. Black text reads best on it, at 5.27:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.27:1 |
| White text | 3.97:1 |
Values
| HEX | #657CC9 |
| RGB | rgb(101, 124, 201) |
| HSL | hsl(226, 48%, 59%) |
| OKLCH | oklch(60.3% 0.121 269.9) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #657CC9 | 3.97:1 | AA large text | Lc -72.5 | Content text, not long reading |
| Black text on #657CC9 | 5.27:1 | AA | Lc 37.1 | Non-text elements, placeholder text |
| #657CC9 text on white | 3.97:1 | AA large text | Lc 67.0 | Content text, not long reading |
| #657CC9 text on black | 5.27:1 | AA | Lc -34.7 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 500.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D0D9F0
oklch(88.6% 0.033 268.7)
-
Step 300
300
#B1C0E8
oklch(81% 0.059 268.9)
-
Step 400
400
#899EDC
oklch(70.7% 0.094 269.5)
-
Step 500
500 (this color)
#657CC9
oklch(60.3% 0.121 269.9)
-
Step 600
600
#566DC0
oklch(55.7% 0.131 270)
-
Step 700
700
#465BA5
oklch(49.2% 0.121 269.6)
-
Step 800
800
#3A4A86
oklch(42.7% 0.101 270.4)
-
Step 900
900
#313E6B
oklch(37.5% 0.079 270.1)
-
Step 950
950
#1D253F
oklch(27.1% 0.05 269.9)
#657CC9 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #5E84CC | 0.022 |
| Deuteranopia (no green cones) | #547BC7 | 0.021 |
| Tritanopia (no blue cones) | #3B8C99 | 0.107 |
| Achromatopsia (no color) | #7F7F7F | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #657CC9
#657CC9
oklch(60.3% 0.121 269.9)
- #9D7D0B
#9D7D0B
oklch(60.3% 0.121 90.2)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #657CC9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.048
- Steel Blue #4682B4 ΔE 0.053
- Windows Blue #3778BF ΔE 0.054
- Soft Blue #6488EA ΔE 0.054
- Faded Blue #658CBB ΔE 0.054
- Off Blue #5684AE ΔE 0.055
- Dusty Blue #5A86AD ΔE 0.059
- Dark Sky Blue #448EE4 ΔE 0.060
Use #657CC9 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.