#255D51
Closest named color: Dark Green Blue (#1F6357). oklch(43.7% 0.062 177), rgb(37, 93, 81).
Aa
White text reads best on this color (7.59:1).
About this color
#255D51 is a dark, muted teal or cyan. In OKLCH its lightness is 44%, its chroma 0.062 and its hue 177°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.019 away. White text reads best on it, at 7.59:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.76:1 |
| White text | 7.59:1 |
Values
| HEX | #255D51 |
| RGB | rgb(37, 93, 81) |
| HSL | hsl(167, 43%, 25%) |
| OKLCH | oklch(43.7% 0.062 177) |
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 #255D51 | 7.59:1 | AAA | Lc -91.0 | Preferred for body text |
| Black text on #255D51 | 2.76:1 | Fails | Lc 17.8 | Dividers and decoration only |
| #255D51 text on white | 7.59:1 | AAA | Lc 86.2 | Fine for body text |
| #255D51 text on black | 2.76:1 | 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
#F2F6F5
oklch(97% 0.004 179.7)
-
Step 100
100
#E3ECEA
oklch(93.6% 0.01 181.4)
-
Step 200
200
#CCDED9
oklch(88.6% 0.02 177.4)
-
Step 300
300
#A9C9C0
oklch(81% 0.037 176.5)
-
Step 400
400
#79ADA0
oklch(70.7% 0.058 177.2)
-
Step 500
500
#549888
oklch(63% 0.074 176.8)
-
Step 600
600
#358372
oklch(55.6% 0.081 176.5)
-
Step 700
700
#266F60
oklch(49.2% 0.076 176.8)
-
Step 800
800 (this color)
#255D51
oklch(43.7% 0.062 177)
-
Step 900
900
#224A41
oklch(37.7% 0.048 177)
-
Step 950
950
#152B26
oklch(26.9% 0.03 177.6)
#255D51 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) | #5A5750 | 0.066 |
| Deuteranopia (no green cones) | #515152 | 0.063 |
| Tritanopia (no blue cones) | #005E59 | 0.019 |
| Achromatopsia (no color) | #545454 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255D51
#255D51
oklch(43.7% 0.062 177)
- #6E4352
#6E4352
oklch(43.8% 0.063 357.6)
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 #255D51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.019
- Deep Teal #00555A ΔE 0.040
- Petrol #005F6A ΔE 0.041
- Pine #2B5D34 ΔE 0.044
- Dark Blue Green #005249 ΔE 0.045
- Dark Slate Gray #2F4F4F ΔE 0.045
- Dark Aqua #05696B ΔE 0.047
- Spruce #0A5F38 ΔE 0.047
Use #255D51 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.