#255A55
Closest named color: Dark Green Blue (#1F6357). oklch(43% 0.057 187), rgb(37, 90, 85).
Aa
White text reads best on this color (7.85:1).
About this color
#255A55 is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.057 and its hue 187°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.028 away. White text reads best on it, at 7.85:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.67:1 |
| White text | 7.85:1 |
Values
| HEX | #255A55 |
| RGB | rgb(37, 90, 85) |
| HSL | hsl(174, 42%, 25%) |
| OKLCH | oklch(43% 0.057 187) |
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 #255A55 | 7.85:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #255A55 | 2.67:1 | Fails | Lc 16.9 | Dividers and decoration only |
| #255A55 text on white | 7.85:1 | AAA | Lc 87.1 | Fine for body text |
| #255A55 text on black | 2.67:1 | Fails | Lc -15.0 | 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
#7AACA6
oklch(70.7% 0.054 186.7)
-
Step 500
500
#569790
oklch(63.1% 0.068 186.7)
-
Step 600
600
#38817A
oklch(55.5% 0.073 186.8)
-
Step 700
700
#296D67
oklch(49% 0.069 187.2)
-
Step 800
800 (this color)
#255A55
oklch(43% 0.057 187)
-
Step 900
900
#234945
oklch(37.6% 0.044 186.6)
-
Step 950
950
#152B29
oklch(27% 0.028 188.1)
#255A55 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) | #555555 | 0.060 |
| Deuteranopia (no green cones) | #4D4F56 | 0.057 |
| Tritanopia (no blue cones) | #005C58 | 0.018 |
| Achromatopsia (no color) | #525252 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255A55
#255A55
oklch(43% 0.057 187)
- #6B434A
#6B434A
oklch(43.1% 0.056 8.3)
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 #255A55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.028
- Deep Teal #00555A ΔE 0.030
- Dark Slate Gray #2F4F4F ΔE 0.034
- Petrol #005F6A ΔE 0.034
- Dark Blue Green #005249 ΔE 0.039
- Dark Aqua #05696B ΔE 0.050
- Dark Teal #014D4E ΔE 0.051
- Pine #2B5D34 ΔE 0.055
Use #255A55 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.