#255C57
Closest named color: Dark Green Blue (#1F6357). oklch(43.7% 0.058 187.2), rgb(37, 92, 87).
Aa
White text reads best on this color (7.64:1).
About this color
#255C57 is a dark, muted teal or cyan. In OKLCH its lightness is 44%, its chroma 0.058 and its hue 187°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.023 away. White text reads best on it, at 7.64:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.74:1 |
| White text | 7.64:1 |
Values
| HEX | #255C57 |
| RGB | rgb(37, 92, 87) |
| HSL | hsl(175, 43%, 25%) |
| OKLCH | oklch(43.7% 0.058 187.2) |
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 #255C57 | 7.64:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #255C57 | 2.74:1 | Fails | Lc 17.6 | Dividers and decoration only |
| #255C57 text on white | 7.64:1 | AAA | Lc 86.4 | Fine for body text |
| #255C57 text on black | 2.74:1 | Fails | Lc -15.7 | 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 800.
-
Step 50
50
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E3ECEB
oklch(93.6% 0.01 189.1)
-
Step 200
200
#CCDDDB
oklch(88.4% 0.018 188.3)
-
Step 300
300
#A9C8C4
oklch(80.9% 0.034 187)
-
Step 400
400
#79ACA6
oklch(70.7% 0.055 186.9)
-
Step 500
500
#549791
oklch(63% 0.069 188.1)
-
Step 600
600
#35827B
oklch(55.7% 0.076 187.1)
-
Step 700
700
#276E67
oklch(49.2% 0.071 186.1)
-
Step 800
800 (this color)
#255C57
oklch(43.7% 0.058 187.2)
-
Step 900
900
#224946
oklch(37.6% 0.045 188.9)
-
Step 950
950
#152B29
oklch(27% 0.028 188.1)
#255C57 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) | #575757 | 0.062 |
| Deuteranopia (no green cones) | #4E5158 | 0.058 |
| Tritanopia (no blue cones) | #005E5A | 0.017 |
| Achromatopsia (no color) | #535353 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255C57
#255C57
oklch(43.7% 0.058 187.2)
- #6D444C
#6D444C
oklch(43.6% 0.058 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 #255C57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.023
- Petrol #005F6A ΔE 0.032
- Deep Teal #00555A ΔE 0.034
- Dark Slate Gray #2F4F4F ΔE 0.040
- Dark Aqua #05696B ΔE 0.044
- Dark Blue Green #005249 ΔE 0.045
- Pine #2B5D34 ΔE 0.055
- Dark Teal #014D4E ΔE 0.057
Use #255C57 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.