#657D9F
Closest named color: Grey Blue (#647D8E). oklch(58.4% 0.06 257.1), rgb(101, 125, 159).
Aa
Black text reads best on this color (4.98:1).
About this color
#657D9F is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.060 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.027 away. Black text reads best on it, at 4.98:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.98:1 |
| White text | 4.21:1 |
Values
| HEX | #657D9F |
| RGB | rgb(101, 125, 159) |
| HSL | hsl(215, 23%, 51%) |
| OKLCH | oklch(58.4% 0.06 257.1) |
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 #657D9F | 4.21:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #657D9F | 4.98:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #657D9F text on white | 4.21:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #657D9F text on black | 4.98:1 | AA | Lc -32.6 | 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
#B6C2D2
oklch(81% 0.026 255.6)
-
Step 400
400
#90A2BC
oklch(70.7% 0.043 257.5)
-
Step 500
500
#758BAB
oklch(63.1% 0.055 257.7)
-
Step 600
600 (this color)
#657D9F
oklch(58.4% 0.06 257.1)
-
Step 700
700
#4D6280
oklch(49.1% 0.055 257.3)
-
Step 800
800
#3F5068
oklch(42.7% 0.045 257)
-
Step 900
900
#364255
oklch(37.7% 0.036 259.5)
-
Step 950
950
#1F2732
oklch(27% 0.024 256.4)
#657D9F 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) | #717FA1 | 0.018 |
| Deuteranopia (no green cones) | #6A799E | 0.012 |
| Tritanopia (no blue cones) | #538488 | 0.052 |
| Achromatopsia (no color) | #7B7B7B | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #657D9F
#657D9F
oklch(58.4% 0.06 257.1)
- #907753
#907753
oklch(58.4% 0.06 76.2)
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 #657D9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.027
- Stormy Blue #507B9C ΔE 0.027
- Off Blue #5684AE ΔE 0.029
- Dusty Blue #5A86AD ΔE 0.029
- Slate Gray #708090 ΔE 0.031
- Lavender Gray #7E7F9A ΔE 0.036
- Steel #738595 ΔE 0.037
- Cerulean #457B9D ΔE 0.038
Use #657D9F 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.