#255F51
Closest named color: Dark Green Blue (#1F6357). oklch(44.3% 0.065 174.8), rgb(37, 95, 81).
Aa
White text reads best on this color (7.40:1).
About this color
#255F51 is a dark, muted teal or cyan. In OKLCH its lightness is 44%, its chroma 0.065 and its hue 175°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.013 away. White text reads best on it, at 7.40:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.83:1 |
| White text | 7.40:1 |
Values
| HEX | #255F51 |
| RGB | rgb(37, 95, 81) |
| HSL | hsl(166, 44%, 26%) |
| OKLCH | oklch(44.3% 0.065 174.8) |
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 #255F51 | 7.40:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #255F51 | 2.83:1 | Fails | Lc 18.5 | Dividers and decoration only |
| #255F51 text on white | 7.40:1 | AAA | Lc 85.5 | Fine for body text |
| #255F51 text on black | 2.83:1 | Fails | Lc -16.5 | 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
#F2F7F5
oklch(97.2% 0.006 170.4)
-
Step 100
100
#E3ECE9
oklch(93.5% 0.01 174.3)
-
Step 200
200
#CCDED8
oklch(88.5% 0.021 173.9)
-
Step 300
300
#A8C9BF
oklch(80.9% 0.038 175)
-
Step 400
400
#78AD9E
oklch(70.6% 0.06 174.9)
-
Step 500
500
#529986
oklch(63.1% 0.078 174.3)
-
Step 600
600
#328370
oklch(55.5% 0.084 174.9)
-
Step 700
700
#246F5E
oklch(49.1% 0.078 174.9)
-
Step 800
800 (this color)
#255F51
oklch(44.3% 0.065 174.8)
-
Step 900
900
#214A40
oklch(37.6% 0.05 175.5)
-
Step 950
950
#142C25
oklch(27.1% 0.033 172.8)
#255F51 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) | #5C5950 | 0.068 |
| Deuteranopia (no green cones) | #535352 | 0.064 |
| Tritanopia (no blue cones) | #00605B | 0.021 |
| Achromatopsia (no color) | #555555 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255F51
#255F51
oklch(44.3% 0.065 174.8)
- #704455
#704455
oklch(44.3% 0.065 355.3)
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 #255F51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.013
- Pine #2B5D34 ΔE 0.042
- Petrol #005F6A ΔE 0.042
- Dark Aqua #05696B ΔE 0.043
- Spruce #0A5F38 ΔE 0.045
- Deep Teal #00555A ΔE 0.046
- Dark Blue Green #005249 ΔE 0.050
- Dark Slate Gray #2F4F4F ΔE 0.052
Use #255F51 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.