#657E8B
Closest named color: Grey Blue (#647D8E). oklch(57.8% 0.035 230.8), rgb(101, 126, 139).
Aa
Black text reads best on this color (4.91:1).
About this color
#657E8B is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.035 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.006 away. Black text reads best on it, at 4.91:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.91:1 |
| White text | 4.27:1 |
Values
| HEX | #657E8B |
| RGB | rgb(101, 126, 139) |
| HSL | hsl(201, 16%, 47%) |
| OKLCH | oklch(57.8% 0.035 230.8) |
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 #657E8B | 4.27:1 | AA large text | Lc -75.1 | Fine for body text |
| Black text on #657E8B | 4.91:1 | AA | Lc 34.5 | Non-text elements, placeholder text |
| #657E8B text on white | 4.27:1 | AA large text | Lc 69.6 | Content text, not long reading |
| #657E8B text on black | 4.91:1 | AA | Lc -32.1 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E7EAEC
oklch(93.5% 0.004 236.5)
-
Step 200
200
#D4DADE
oklch(88.5% 0.009 236.6)
-
Step 300
300
#B7C3C9
oklch(81% 0.016 229)
-
Step 400
400
#91A4AE
oklch(70.7% 0.026 230.6)
-
Step 500
500
#768D9A
oklch(63% 0.033 232.8)
-
Step 600
600 (this color)
#657E8B
oklch(57.8% 0.035 230.8)
-
Step 700
700
#4E6470
oklch(49% 0.033 232.1)
-
Step 800
800
#40525B
oklch(42.7% 0.027 229.8)
-
Step 900
900
#36444B
oklch(37.7% 0.022 229.7)
-
Step 950
950
#20282C
oklch(27.1% 0.014 229.5)
#657E8B 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) | #787D8C | 0.026 |
| Deuteranopia (no green cones) | #72788B | 0.024 |
| Tritanopia (no blue cones) | #5A8282 | 0.025 |
| Achromatopsia (no color) | #7A7A7A | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #657E8B
#657E8B
oklch(57.8% 0.035 230.8)
- #8C7467
#8C7467
oklch(57.8% 0.036 50.1)
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 #657E8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.006
- Battleship Grey #6B7C85 ΔE 0.011
- Slate Gray #708090 ΔE 0.018
- Steel Grey #6F828A ΔE 0.019
- Battleship Gray #6C757D ΔE 0.028
- Steel #738595 ΔE 0.031
- Stormy Blue #507B9C ΔE 0.039
- Medium Grey #7D7F7C ΔE 0.039
Use #657E8B 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.