#255C59
Closest named color: Dark Green Blue (#1F6357). oklch(43.7% 0.058 190.4), rgb(37, 92, 89).
Aa
White text reads best on this color (7.62:1).
About this color
#255C59 is a dark, muted teal or cyan. In OKLCH its lightness is 44%, its chroma 0.058 and its hue 190°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.024 away. White text reads best on it, at 7.62:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.75:1 |
| White text | 7.62:1 |
Values
| HEX | #255C59 |
| RGB | rgb(37, 92, 89) |
| HSL | hsl(177, 43%, 25%) |
| OKLCH | oklch(43.7% 0.058 190.4) |
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 #255C59 | 7.62:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #255C59 | 2.75:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #255C59 text on white | 7.62:1 | AAA | Lc 86.3 | Fine for body text |
| #255C59 text on black | 2.75:1 | Fails | Lc -15.8 | 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
#CCDDDC
oklch(88.4% 0.018 192.6)
-
Step 300
300
#A9C8C5
oklch(80.9% 0.034 189.3)
-
Step 400
400
#79ACA8
oklch(70.7% 0.054 189.9)
-
Step 500
500
#549793
oklch(63.1% 0.069 190.6)
-
Step 600
600
#35817D
oklch(55.5% 0.075 190.5)
-
Step 700
700
#266D6A
oklch(49% 0.07 191.2)
-
Step 800
800 (this color)
#255C59
oklch(43.7% 0.058 190.4)
-
Step 900
900
#224947
oklch(37.6% 0.044 191)
-
Step 950
950
#152B2A
oklch(27% 0.028 191.9)
#255C59 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) | #575759 | 0.062 |
| Deuteranopia (no green cones) | #4E515A | 0.057 |
| Tritanopia (no blue cones) | #005E5B | 0.017 |
| Achromatopsia (no color) | #545454 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255C59
#255C59
oklch(43.7% 0.058 190.4)
- #6E444A
#6E444A
oklch(43.7% 0.059 10.5)
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 #255C59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.024
- Petrol #005F6A ΔE 0.029
- Deep Teal #00555A ΔE 0.033
- Dark Slate Gray #2F4F4F ΔE 0.040
- Dark Aqua #05696B ΔE 0.042
- Dark Blue Green #005249 ΔE 0.046
- Dark Teal #014D4E ΔE 0.057
- Pine #2B5D34 ΔE 0.059
Use #255C59 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.