#255457
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.5% 0.051 201), rgb(37, 84, 87).
Aa
White text reads best on this color (8.45:1).
About this color
#255457 is a dark, muted teal or cyan. In OKLCH its lightness is 41%, its chroma 0.051 and its hue 201°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.018 away. White text reads best on it, at 8.45:1.
| Hue family | Teals and cyans |
| Lightness | dark (41%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.48:1 |
| White text | 8.45:1 |
Values
| HEX | #255457 |
| RGB | rgb(37, 84, 87) |
| HSL | hsl(184, 40%, 24%) |
| OKLCH | oklch(41.5% 0.051 201) |
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 #255457 | 8.45:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #255457 | 2.48:1 | Fails | Lc 15.0 | Dividers and decoration only |
| #255457 text on white | 8.45:1 | AAA | Lc 89.0 | Fine for body text |
| #255457 text on black | 2.48:1 | Fails | Lc -13.2 | 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 800.
-
Step 50
50
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E4ECEC
oklch(93.7% 0.009 197)
-
Step 200
200
#CDDDDD
oklch(88.6% 0.017 196.8)
-
Step 300
300
#ABC7C8
oklch(80.9% 0.03 199.2)
-
Step 400
400
#7DAAAD
oklch(70.7% 0.048 201.3)
-
Step 500
500
#5B9599
oklch(63.2% 0.061 201.4)
-
Step 600
600
#3E7F83
oklch(55.6% 0.067 200.8)
-
Step 700
700
#306B6F
oklch(49% 0.061 201.3)
-
Step 800
800 (this color)
#255457
oklch(41.5% 0.051 201)
-
Step 900
900
#26484A
oklch(37.7% 0.04 200.5)
-
Step 950
950
#172A2B
oklch(26.9% 0.025 200)
#255457 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) | #4E5157 | 0.051 |
| Deuteranopia (no green cones) | #464A57 | 0.049 |
| Tritanopia (no blue cones) | #005755 | 0.022 |
| Achromatopsia (no color) | #4D4D4D | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255457
#255457
oklch(41.5% 0.051 201)
- #65403F
#65403F
oklch(41.4% 0.052 21.2)
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 #255457, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.018
- Deep Teal #00555A ΔE 0.019
- Dark Blue Green #005249 ΔE 0.034
- Dark Teal #014D4E ΔE 0.036
- Petrol #005F6A ΔE 0.040
- Charcoal #264653 ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.049
- Dark Green Blue #1F6357 ΔE 0.049
Use #255457 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.