#42657C
Closest named color: Slate (#516572). oklch(49% 0.055 238.2), rgb(66, 101, 124).
Aa
White text reads best on this color (6.20:1).
About this color
#42657C is a medium-dark, muted blue. In OKLCH its lightness is 49%, its chroma 0.055 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.024 away. White text reads best on it, at 6.20:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.38:1 |
| White text | 6.20:1 |
Values
| HEX | #42657C |
| RGB | rgb(66, 101, 124) |
| HSL | hsl(204, 31%, 37%) |
| OKLCH | oklch(49% 0.055 238.2) |
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 #42657C | 6.20:1 | AA | Lc -86.0 | Fine for body text |
| Black text on #42657C | 3.38:1 | AA large text | Lc 23.2 | Dividers and decoration only |
| #42657C text on white | 6.20:1 | AA | Lc 80.9 | Fine for body text |
| #42657C text on black | 3.38:1 | AA large text | Lc -21.0 | Dividers and decoration only |
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 700.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D1DBE2
oklch(88.6% 0.015 238)
-
Step 300
300
#B2C4D0
oklch(81% 0.026 236.9)
-
Step 400
400
#89A5B8
oklch(70.7% 0.042 237.9)
-
Step 500
500
#6B8FA7
oklch(63.2% 0.054 237.9)
-
Step 600
600
#527992
oklch(55.7% 0.059 237.4)
-
Step 700
700 (this color)
#42657C
oklch(49% 0.055 238.2)
-
Step 800
800
#375365
oklch(42.8% 0.045 237.4)
-
Step 900
900
#304452
oklch(37.6% 0.035 239.4)
-
Step 950
950
#1C2830
oklch(26.9% 0.022 237.9)
#42657C 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) | #5B647D | 0.033 |
| Deuteranopia (no green cones) | #535E7C | 0.029 |
| Tritanopia (no blue cones) | #296B6D | 0.043 |
| Achromatopsia (no color) | #616161 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42657C
#42657C
oklch(49% 0.055 238.2)
- #785941
#785941
oklch(49% 0.055 58.8)
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 #42657C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.024
- Denim #3B638C ΔE 0.029
- YInMn Blue #415A77 ΔE 0.033
- Dusty Grape #545775 ΔE 0.044
- Dusky Blue #475F94 ΔE 0.048
- Light Navy Blue #2E5A88 ΔE 0.050
- Metallic Blue #4F738E ΔE 0.050
- Peacock Blue #016795 ΔE 0.053
Use #42657C 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.