#21504E
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.8% 0.051 191.5), rgb(33, 80, 78).
Aa
White text reads best on this color (9.04:1).
About this color
#21504E is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.051 and its hue 192°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.015 away. White text reads best on it, at 9.04:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.32:1 |
| White text | 9.04:1 |
Values
| HEX | #21504E |
| RGB | rgb(33, 80, 78) |
| HSL | hsl(177, 42%, 22%) |
| OKLCH | oklch(39.8% 0.051 191.5) |
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 #21504E | 9.04:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #21504E | 2.32:1 | Fails | Lc 13.3 | Not readable |
| #21504E text on white | 9.04:1 | AAA | Lc 90.6 | Preferred for body text |
| #21504E 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
#F2F7F6
oklch(97.2% 0.005 183)
-
Step 100
100
#E2ECEC
oklch(93.6% 0.011 197)
-
Step 200
200
#CADEDC
oklch(88.5% 0.022 189.5)
-
Step 300
300
#A5C9C7
oklch(80.9% 0.038 192.3)
-
Step 400
400
#72ADAA
oklch(70.6% 0.061 191.8)
-
Step 500
500
#499995
oklch(63.2% 0.079 191)
-
Step 600
600
#248380
oklch(55.6% 0.085 191.9)
-
Step 700
700
#146F6C
oklch(49.2% 0.079 191.4)
-
Step 800
800
#165A58
oklch(42.6% 0.065 192.1)
-
Step 900
900 (this color)
#21504E
oklch(39.8% 0.051 191.5)
-
Step 950
950
#112C2A
oklch(27.1% 0.033 189)
#21504E 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) | #4B4C4E | 0.053 |
| Deuteranopia (no green cones) | #44464E | 0.051 |
| Tritanopia (no blue cones) | #00524F | 0.017 |
| Achromatopsia (no color) | #494949 | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21504E
#21504E
oklch(39.8% 0.051 191.5)
- #603C40
#603C40
oklch(40% 0.051 12.4)
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 #21504E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.015
- Dark Blue Green #005249 ΔE 0.022
- Dark Teal #014D4E ΔE 0.022
- Deep Teal #00555A ΔE 0.024
- Charcoal #264653 ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.046
- Charcoal Grey #3C4142 ΔE 0.052
- Petrol #005F6A ΔE 0.056
Use #21504E 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.