#255B57
Closest named color: Dark Green Blue (#1F6357). oklch(43.4% 0.057 188.7), rgb(37, 91, 87).
Aa
White text reads best on this color (7.74:1).
About this color
#255B57 is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.057 and its hue 189°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.026 away. White text reads best on it, at 7.74:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.71:1 |
| White text | 7.74:1 |
Values
| HEX | #255B57 |
| RGB | rgb(37, 91, 87) |
| HSL | hsl(176, 42%, 25%) |
| OKLCH | oklch(43.4% 0.057 188.7) |
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 #255B57 | 7.74:1 | AAA | Lc -91.5 | Preferred for body text |
| Black text on #255B57 | 2.71:1 | Fails | Lc 17.3 | Dividers and decoration only |
| #255B57 text on white | 7.74:1 | AAA | Lc 86.7 | Fine for body text |
| #255B57 text on black | 2.71:1 | Fails | Lc -15.4 | 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
#A9C8C5
oklch(80.9% 0.034 189.3)
-
Step 400
400
#7AACA7
oklch(70.8% 0.054 188.3)
-
Step 500
500
#559792
oklch(63.1% 0.068 189.3)
-
Step 600
600
#36817C
oklch(55.5% 0.074 189.3)
-
Step 700
700
#286D68
oklch(49% 0.069 188.5)
-
Step 800
800 (this color)
#255B57
oklch(43.4% 0.057 188.7)
-
Step 900
900
#224946
oklch(37.6% 0.045 188.9)
-
Step 950
950
#152B29
oklch(27% 0.028 188.1)
#255B57 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) | #565657 | 0.061 |
| Deuteranopia (no green cones) | #4D5058 | 0.057 |
| Tritanopia (no blue cones) | #005D5A | 0.017 |
| Achromatopsia (no color) | #535353 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255B57
#255B57
oklch(43.4% 0.057 188.7)
- #6C434A
#6C434A
oklch(43.3% 0.058 8.6)
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 #255B57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.026
- Deep Teal #00555A ΔE 0.031
- Petrol #005F6A ΔE 0.032
- Dark Slate Gray #2F4F4F ΔE 0.037
- Dark Blue Green #005249 ΔE 0.043
- Dark Aqua #05696B ΔE 0.046
- Dark Teal #014D4E ΔE 0.054
- Pine #2B5D34 ΔE 0.057
Use #255B57 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.