#657E9B
Closest named color: Grey Blue (#647D8E). oklch(58.4% 0.053 252.5), rgb(101, 126, 155).
Aa
Black text reads best on this color (5.01:1).
About this color
#657E9B is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.053 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.020 away. Black text reads best on it, at 5.01:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 5.01:1 |
| White text | 4.19:1 |
Values
| HEX | #657E9B |
| RGB | rgb(101, 126, 155) |
| HSL | hsl(212, 21%, 50%) |
| OKLCH | oklch(58.4% 0.053 252.5) |
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 #657E9B | 4.19:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #657E9B | 5.01:1 | AA | Lc 35.2 | Non-text elements, placeholder text |
| #657E9B text on white | 4.19:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #657E9B text on black | 5.01:1 | AA | Lc -32.8 | 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
#F4F6F8
oklch(97.2% 0.003 247.9)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D3DAE2
oklch(88.5% 0.013 251.6)
-
Step 300
300
#B6C2D0
oklch(80.9% 0.024 252.2)
-
Step 400
400
#90A3B9
oklch(70.8% 0.039 252.2)
-
Step 500
500
#748CA7
oklch(63.1% 0.049 251.6)
-
Step 600
600 (this color)
#657E9B
oklch(58.4% 0.053 252.5)
-
Step 700
700
#4C637D
oklch(49.2% 0.05 251.9)
-
Step 800
800
#3F5165
oklch(42.8% 0.04 251.4)
-
Step 900
900
#354352
oklch(37.7% 0.032 250.4)
-
Step 950
950
#1F2730
oklch(26.9% 0.02 251.6)
#657E9B 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) | #737F9C | 0.019 |
| Deuteranopia (no green cones) | #6D799A | 0.017 |
| Tritanopia (no blue cones) | #548488 | 0.045 |
| Achromatopsia (no color) | #7C7C7C | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #657E9B
#657E9B
oklch(58.4% 0.053 252.5)
- #907758
#907758
oklch(58.5% 0.054 72.4)
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 #657E9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.020
- Slate Gray #708090 ΔE 0.024
- Stormy Blue #507B9C ΔE 0.028
- Dusty Blue #5A86AD ΔE 0.031
- Off Blue #5684AE ΔE 0.032
- Steel #738595 ΔE 0.032
- Battleship Grey #6B7C85 ΔE 0.033
- Steel Grey #6F828A ΔE 0.034
Use #657E9B 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.