#004257
Closest named color: Midnight Green (#073B4C). oklch(35.4% 0.068 227.1), rgb(0, 66, 87).
Aa
White text reads best on this color (10.95:1).
About this color
#004257 is a dark, muted teal or cyan. In OKLCH its lightness is 35%, its chroma 0.068 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.026 away. White text reads best on it, at 10.95:1.
| Hue family | Teals and cyans |
| Lightness | dark (35%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.91:1 |
| White text | 10.95:1 |
Values
| HEX | #004257 |
| RGB | rgb(0, 66, 87) |
| HSL | hsl(194, 100%, 17%) |
| OKLCH | oklch(35.4% 0.068 227.1) |
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 #004257 | 10.95:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #004257 | 1.91:1 | Fails | Lc 9.0 | Not readable |
| #004257 text on white | 10.95:1 | AAA | Lc 94.9 | Preferred for body text |
| #004257 text on black | 1.91:1 | Fails | Lc -7.7 | Not readable |
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 900.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E0ECF2
oklch(93.6% 0.015 229)
-
Step 200
200
#C6DDE8
oklch(88.4% 0.029 228.1)
-
Step 300
300
#9EC8DB
oklch(80.9% 0.052 227.3)
-
Step 400
400
#66ABC8
oklch(70.7% 0.082 227)
-
Step 500
500
#3296BB
oklch(63.2% 0.105 227.1)
-
Step 600
600
#007FA4
oklch(55.6% 0.108 227.1)
-
Step 700
700
#006B8A
oklch(49.2% 0.095 226.5)
-
Step 800
800
#005772
oklch(42.6% 0.083 227.6)
-
Step 900
900 (this color)
#004257
oklch(35.4% 0.068 227.1)
-
Step 950
950
#0A2B37
oklch(27.2% 0.043 226.1)
#004257 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) | #374158 | 0.050 |
| Deuteranopia (no green cones) | #2C3957 | 0.043 |
| Tritanopia (no blue cones) | #004849 | 0.037 |
| Achromatopsia (no color) | #3C3C3C | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #004257
#004257
oklch(35.4% 0.068 227.1)
- #582F1A
#582F1A
oklch(35.3% 0.068 46.7)
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 #004257, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.029
- Charcoal #264653 ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.036
- Prussian Blue #1D3557 ΔE 0.044
- Dark Teal #014D4E ΔE 0.045
- Marine Blue #01386A ΔE 0.051
- Onyx #343A40 ΔE 0.057
Use #004257 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.