#21504A
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.7% 0.052 184.2), rgb(33, 80, 74).
Aa
White text reads best on this color (9.08:1).
About this color
#21504A is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.052 and its hue 184°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.018 away. White text reads best on it, at 9.08:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.052) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.31:1 |
| White text | 9.08:1 |
Values
| HEX | #21504A |
| RGB | rgb(33, 80, 74) |
| HSL | hsl(172, 42%, 22%) |
| OKLCH | oklch(39.7% 0.052 184.2) |
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 #21504A | 9.08:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #21504A | 2.31:1 | Fails | Lc 13.2 | Not readable |
| #21504A text on white | 9.08:1 | AAA | Lc 90.7 | Preferred for body text |
| #21504A text on black | 2.31:1 | Fails | Lc -11.6 | 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
#E2ECEB
oklch(93.5% 0.011 189.8)
-
Step 200
200
#CADEDB
oklch(88.5% 0.022 186)
-
Step 300
300
#A5C9C3
oklch(80.8% 0.039 184.1)
-
Step 400
400
#73AEA5
oklch(70.8% 0.063 183.9)
-
Step 500
500
#4A998F
oklch(63% 0.08 184.5)
-
Step 600
600
#258479
oklch(55.7% 0.088 183.8)
-
Step 700
700
#156F66
oklch(49% 0.081 184.6)
-
Step 800
800
#165B53
oklch(42.7% 0.068 183.7)
-
Step 900
900 (this color)
#21504A
oklch(39.7% 0.052 184.2)
-
Step 950
950
#112C28
oklch(27% 0.034 182.9)
#21504A 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) | #4C4C4A | 0.055 |
| Deuteranopia (no green cones) | #45464B | 0.053 |
| Tritanopia (no blue cones) | #02524E | 0.016 |
| Achromatopsia (no color) | #484848 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21504A
#21504A
oklch(39.7% 0.052 184.2)
- #5F3B43
#5F3B43
oklch(39.7% 0.052 5.2)
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 #21504A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.018
- Dark Blue Green #005249 ΔE 0.018
- Dark Teal #014D4E ΔE 0.023
- Deep Teal #00555A ΔE 0.028
- Charcoal #264653 ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.051
- Charcoal Grey #3C4142 ΔE 0.053
- Petrol #005F6A ΔE 0.060
Use #21504A 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.