#255357
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.2% 0.051 203), rgb(37, 83, 87).
Aa
White text reads best on this color (8.55:1).
About this color
#255357 is a dark, muted teal or cyan. In OKLCH its lightness is 41%, its chroma 0.051 and its hue 203°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.017 away. White text reads best on it, at 8.55:1.
| Hue family | Teals and cyans |
| Lightness | dark (41%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.45:1 |
| White text | 8.55:1 |
Values
| HEX | #255357 |
| RGB | rgb(37, 83, 87) |
| HSL | hsl(185, 40%, 24%) |
| OKLCH | oklch(41.2% 0.051 203) |
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 #255357 | 8.55:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #255357 | 2.45:1 | Fails | Lc 14.7 | Not readable |
| #255357 text on white | 8.55:1 | AAA | Lc 89.3 | Fine for body text |
| #255357 text on black | 2.45:1 | Fails | Lc -13.0 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E4ECEC
oklch(93.7% 0.009 197)
-
Step 200
200
#CDDDDE
oklch(88.6% 0.017 201.4)
-
Step 300
300
#ABC7C9
oklch(81% 0.03 201.9)
-
Step 400
400
#7EAAAE
oklch(70.8% 0.048 203.1)
-
Step 500
500
#5B959A
oklch(63.2% 0.061 202.8)
-
Step 600
600
#3F7F84
oklch(55.6% 0.066 202.2)
-
Step 700
700
#316B70
oklch(49.1% 0.061 202.9)
-
Step 800
800 (this color)
#255357
oklch(41.2% 0.051 203)
-
Step 900
900
#26484B
oklch(37.7% 0.04 203)
-
Step 950
950
#172A2C
oklch(27% 0.025 204.3)
#255357 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) | #4D5057 | 0.050 |
| Deuteranopia (no green cones) | #454A57 | 0.046 |
| Tritanopia (no blue cones) | #005654 | 0.023 |
| Achromatopsia (no color) | #4C4C4C | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255357
#255357
oklch(41.2% 0.051 203)
- #64403E
#64403E
oklch(41.3% 0.051 23)
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 #255357, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.017
- Deep Teal #00555A ΔE 0.019
- Dark Blue Green #005249 ΔE 0.034
- Dark Teal #014D4E ΔE 0.034
- Charcoal #264653 ΔE 0.042
- Petrol #005F6A ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.045
- Dark Green Blue #1F6357 ΔE 0.053
Use #255357 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.