#255651
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.8% 0.054 186.5), rgb(37, 86, 81).
Aa
White text reads best on this color (8.30:1).
About this color
#255651 is a dark, muted teal or cyan. In OKLCH its lightness is 42%, its chroma 0.054 and its hue 186°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.023 away. White text reads best on it, at 8.30:1.
| Hue family | Teals and cyans |
| Lightness | dark (42%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.52:1 |
| White text | 8.30:1 |
Values
| HEX | #255651 |
| RGB | rgb(37, 86, 81) |
| HSL | hsl(174, 40%, 24%) |
| OKLCH | oklch(41.8% 0.054 186.5) |
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 #255651 | 8.30:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #255651 | 2.52:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #255651 text on white | 8.30:1 | AAA | Lc 88.5 | Fine for body text |
| #255651 text on black | 2.52:1 | Fails | Lc -13.7 | Not readable |
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
#E4ECEB
oklch(93.7% 0.009 188.1)
-
Step 200
200
#CDDDDB
oklch(88.5% 0.017 187.8)
-
Step 300
300
#ABC8C4
oklch(81% 0.032 186.4)
-
Step 400
400
#7DABA5
oklch(70.6% 0.05 186.1)
-
Step 500
500
#5A968F
oklch(63% 0.064 186.2)
-
Step 600
600
#3D817A
oklch(55.7% 0.07 186.5)
-
Step 700
700
#2E6D66
oklch(49.2% 0.066 185.5)
-
Step 800
800 (this color)
#255651
oklch(41.8% 0.054 186.5)
-
Step 900
900
#254945
oklch(37.7% 0.042 186.3)
-
Step 950
950
#172B28
oklch(27.1% 0.027 183.8)
#255651 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) | #525251 | 0.057 |
| Deuteranopia (no green cones) | #4A4C52 | 0.054 |
| Tritanopia (no blue cones) | #055854 | 0.017 |
| Achromatopsia (no color) | #4E4E4E | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255651
#255651
oklch(41.8% 0.054 186.5)
- #664048
#664048
oklch(41.8% 0.054 5.9)
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 #255651, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.023
- Deep Teal #00555A ΔE 0.024
- Dark Blue Green #005249 ΔE 0.030
- Dark Teal #014D4E ΔE 0.040
- Dark Green Blue #1F6357 ΔE 0.040
- Petrol #005F6A ΔE 0.043
- Charcoal #264653 ΔE 0.055
- Pine #2B5D34 ΔE 0.057
Use #255651 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.