#21474E
Closest named color: Charcoal (#264653). oklch(37.3% 0.045 211), rgb(33, 71, 78).
Aa
White text reads best on this color (10.11:1).
About this color
#21474E is a dark, muted teal or cyan. In OKLCH its lightness is 37%, its chroma 0.045 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Charcoal (#264653), ΔE 0.012 away. White text reads best on it, at 10.11:1.
| Hue family | Teals and cyans |
| Lightness | dark (37%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Charcoal (#264653) |
| Black text | 2.07:1 |
| White text | 10.11:1 |
Values
| HEX | #21474E |
| RGB | rgb(33, 71, 78) |
| HSL | hsl(189, 41%, 22%) |
| OKLCH | oklch(37.3% 0.045 211) |
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 #21474E | 10.11:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #21474E | 2.07:1 | Fails | Lc 10.6 | Not readable |
| #21474E text on white | 10.11:1 | AAA | Lc 93.4 | Preferred for body text |
| #21474E text on black | 2.07:1 | Fails | Lc -9.1 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECED
oklch(93.7% 0.01 204.9)
-
Step 200
200
#CCDDE0
oklch(88.6% 0.019 209.4)
-
Step 300
300
#A9C7CD
oklch(80.9% 0.033 211.1)
-
Step 400
400
#79AAB4
oklch(70.7% 0.054 211.7)
-
Step 500
500
#5495A1
oklch(63.1% 0.069 210.8)
-
Step 600
600
#367F8C
oklch(55.6% 0.074 211)
-
Step 700
700
#276B77
oklch(49% 0.07 211.2)
-
Step 800
800
#235761
oklch(42.6% 0.057 212.2)
-
Step 900
900 (this color)
#21474E
oklch(37.3% 0.045 211)
-
Step 950
950
#152A2E
oklch(26.9% 0.028 211.1)
#21474E 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) | #41454E | 0.042 |
| Deuteranopia (no green cones) | #3A3F4E | 0.039 |
| Tritanopia (no blue cones) | #024A49 | 0.024 |
| Achromatopsia (no color) | #424242 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21474E
#21474E
oklch(37.3% 0.045 211)
- #563832
#563832
oklch(37.4% 0.045 31.7)
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 #21474E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal #264653 ΔE 0.012
- Dark Teal #014D4E ΔE 0.025
- Dark Grey Blue #29465B ΔE 0.026
- Dark Slate Gray #2F4F4F ΔE 0.033
- Charcoal Grey #3C4142 ΔE 0.038
- Dark Blue Grey #1F3B4D ΔE 0.041
- Dark Blue Green #005249 ΔE 0.043
- Deep Teal #00555A ΔE 0.045
Use #21474E 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.