#25504B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.9% 0.049 185.5), rgb(37, 80, 75).
Aa
White text reads best on this color (9.02:1).
About this color
#25504B is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.049 and its hue 186°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.014 away. White text reads best on it, at 9.02:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.32:1 |
| White text | 9.02:1 |
Values
| HEX | #25504B |
| RGB | rgb(37, 80, 75) |
| HSL | hsl(173, 37%, 23%) |
| OKLCH | oklch(39.9% 0.049 185.5) |
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 #25504B | 9.02:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #25504B | 2.32:1 | Fails | Lc 13.4 | Not readable |
| #25504B text on white | 9.02:1 | AAA | Lc 90.6 | Preferred for body text |
| #25504B text on black | 2.32:1 | Fails | Lc -11.7 | 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 900.
-
Step 50
50
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E3ECEB
oklch(93.6% 0.01 189.1)
-
Step 200
200
#CBDEDB
oklch(88.6% 0.021 185.4)
-
Step 300
300
#A7C9C4
oklch(81% 0.037 185.6)
-
Step 400
400
#76ADA6
oklch(70.7% 0.059 186)
-
Step 500
500
#4F9890
oklch(63% 0.074 186.2)
-
Step 600
600
#2E837A
oklch(55.7% 0.082 185.3)
-
Step 700
700
#1F6E67
oklch(49% 0.075 186.5)
-
Step 800
800
#1D5A54
oklch(42.7% 0.062 186)
-
Step 900
900 (this color)
#25504B
oklch(39.9% 0.049 185.5)
-
Step 950
950
#132B28
oklch(26.8% 0.031 185.1)
#25504B 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) | #4C4C4B | 0.052 |
| Deuteranopia (no green cones) | #45474C | 0.049 |
| Tritanopia (no blue cones) | #0E524E | 0.015 |
| Achromatopsia (no color) | #494949 | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #25504B
#25504B
oklch(39.9% 0.049 185.5)
- #5E3C43
#5E3C43
oklch(39.8% 0.049 6.1)
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 #25504B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.014
- Dark Blue Green #005249 ΔE 0.022
- Dark Teal #014D4E ΔE 0.026
- Deep Teal #00555A ΔE 0.028
- Charcoal #264653 ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.050
- Charcoal Grey #3C4142 ΔE 0.051
- Petrol #005F6A ΔE 0.058
Use #25504B 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.