#657B9B
Closest named color: Grey Blue (#647D8E). oklch(57.8% 0.056 257.7), rgb(101, 123, 155).
Aa
Black text reads best on this color (4.85:1).
About this color
#657B9B is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.056 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.023 away. Black text reads best on it, at 4.85:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.85:1 |
| White text | 4.32:1 |
Values
| HEX | #657B9B |
| RGB | rgb(101, 123, 155) |
| HSL | hsl(216, 21%, 50%) |
| OKLCH | oklch(57.8% 0.056 257.7) |
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 #657B9B | 4.32:1 | AA large text | Lc -75.4 | Fine for body text |
| Black text on #657B9B | 4.85:1 | AA | Lc 34.2 | Non-text elements, placeholder text |
| #657B9B text on white | 4.32:1 | AA large text | Lc 69.9 | Content text, not long reading |
| #657B9B text on black | 4.85:1 | AA | Lc -31.8 | 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
#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
#B7C1D1
oklch(80.8% 0.025 259.8)
-
Step 400
400
#91A2BA
oklch(70.7% 0.04 257)
-
Step 500
500
#768BA9
oklch(63.1% 0.051 257.3)
-
Step 600
600 (this color)
#657B9B
oklch(57.8% 0.056 257.7)
-
Step 700
700
#4E627E
oklch(49.1% 0.051 256.8)
-
Step 800
800
#405067
oklch(42.7% 0.043 257.4)
-
Step 900
900
#364254
oklch(37.6% 0.035 258.3)
-
Step 950
950
#202731
oklch(27% 0.021 257.3)
#657B9B 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) | #707C9C | 0.016 |
| Deuteranopia (no green cones) | #6A779A | 0.012 |
| Tritanopia (no blue cones) | #548286 | 0.049 |
| Achromatopsia (no color) | #7A7A7A | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #657B9B
#657B9B
oklch(57.8% 0.056 257.7)
- #8C7654
#8C7654
oklch(57.8% 0.056 78.2)
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 #657B9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.023
- Stormy Blue #507B9C ΔE 0.025
- Slate Gray #708090 ΔE 0.030
- Off Blue #5684AE ΔE 0.035
- Battleship Grey #6B7C85 ΔE 0.036
- Dusty Blue #5A86AD ΔE 0.036
- Cerulean #457B9D ΔE 0.036
- Lavender Gray #7E7F9A ΔE 0.038
Use #657B9B 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.