#25524B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.4% 0.051 182.2), rgb(37, 82, 75).
Aa
White text reads best on this color (8.79:1).
About this color
#25524B is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.051 and its hue 182°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.017 away. White text reads best on it, at 8.79:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.38:1 |
| White text | 8.79:1 |
Values
| HEX | #25524B |
| RGB | rgb(37, 82, 75) |
| HSL | hsl(171, 38%, 23%) |
| OKLCH | oklch(40.4% 0.051 182.2) |
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 #25524B | 8.79:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #25524B | 2.38:1 | Fails | Lc 14.0 | Not readable |
| #25524B text on white | 8.79:1 | AAA | Lc 90.0 | Fine for body text |
| #25524B text on black | 2.38:1 | Fails | Lc -12.3 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E4ECEA
oklch(93.6% 0.009 179.6)
-
Step 200
200
#CEDDDA
oklch(88.5% 0.017 182.7)
-
Step 300
300
#ACC7C2
oklch(80.8% 0.03 183.2)
-
Step 400
400
#80ABA3
oklch(70.8% 0.048 182.2)
-
Step 500
500
#5E968C
oklch(63.1% 0.061 181.7)
-
Step 600
600
#428076
oklch(55.5% 0.067 182.1)
-
Step 700
700
#336C63
oklch(49% 0.062 182)
-
Step 800
800 (this color)
#25524B
oklch(40.4% 0.051 182.2)
-
Step 900
900
#284943
oklch(37.8% 0.04 181.1)
-
Step 950
950
#182B27
oklch(27.1% 0.026 179.4)
#25524B 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) | #4F4E4B | 0.055 |
| Deuteranopia (no green cones) | #47484C | 0.052 |
| Tritanopia (no blue cones) | #0D5350 | 0.016 |
| Achromatopsia (no color) | #4A4A4A | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #25524B
#25524B
oklch(40.4% 0.051 182.2)
- #603D46
#603D46
oklch(40.4% 0.051 2.8)
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 #25524B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.017
- Dark Blue Green #005249 ΔE 0.022
- Deep Teal #00555A ΔE 0.028
- Dark Teal #014D4E ΔE 0.030
- Charcoal #264653 ΔE 0.047
- Dark Green Blue #1F6357 ΔE 0.053
- Petrol #005F6A ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.055
Use #25524B 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.