#657B9E
Closest named color: Stormy Blue (#507B9C). oklch(57.9% 0.06 259.6), rgb(101, 123, 158).
Aa
Black text reads best on this color (4.88:1).
About this color
#657B9E is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.060 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.026 away. Black text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.88:1 |
| White text | 4.30:1 |
Values
| HEX | #657B9E |
| RGB | rgb(101, 123, 158) |
| HSL | hsl(217, 23%, 51%) |
| OKLCH | oklch(57.9% 0.06 259.6) |
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 #657B9E | 4.30:1 | AA large text | Lc -75.2 | Fine for body text |
| Black text on #657B9E | 4.88:1 | AA | Lc 34.3 | Non-text elements, placeholder text |
| #657B9E text on white | 4.30:1 | AA large text | Lc 69.7 | Content text, not long reading |
| #657B9E text on black | 4.88:1 | AA | Lc -31.9 | 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 600.
-
Step 50
50
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D3DAE3
oklch(88.6% 0.015 254.6)
-
Step 300
300
#B6C1D3
oklch(80.8% 0.028 260.3)
-
Step 400
400
#91A2BC
oklch(70.8% 0.043 258.8)
-
Step 500
500
#768BAB
oklch(63.2% 0.054 258.7)
-
Step 600
600 (this color)
#657B9E
oklch(57.9% 0.06 259.6)
-
Step 700
700
#4E6181
oklch(49% 0.057 260.7)
-
Step 800
800
#405069
oklch(42.8% 0.046 259.2)
-
Step 900
900
#364255
oklch(37.7% 0.036 259.5)
-
Step 950
950
#202732
oklch(27.1% 0.023 259.3)
#657B9E 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) | #6F7DA0 | 0.015 |
| Deuteranopia (no green cones) | #69779D | 0.012 |
| Tritanopia (no blue cones) | #538287 | 0.052 |
| Achromatopsia (no color) | #7A7A7A | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #657B9E
#657B9E
oklch(57.9% 0.06 259.6)
- #8D7651
#8D7651
oklch(57.8% 0.06 79)
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 #657B9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.026
- Grey Blue #647D8E ΔE 0.028
- Off Blue #5684AE ΔE 0.032
- Slate Gray #708090 ΔE 0.033
- Dusty Blue #5A86AD ΔE 0.034
- Cerulean #457B9D ΔE 0.037
- Lavender Gray #7E7F9A ΔE 0.038
- Dull Blue #49759C ΔE 0.040
Use #657B9E 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.