#21474A
Closest named color: Charcoal (#264653). oklch(37.1% 0.043 202.2), rgb(33, 71, 74).
Aa
White text reads best on this color (10.17:1).
About this color
#21474A is a dark, muted teal or cyan. In OKLCH its lightness is 37%, its chroma 0.043 and its hue 202°. Its hue sits on the cool side of the wheel. The nearest named color is Charcoal (#264653), ΔE 0.019 away. White text reads best on it, at 10.17:1.
| Hue family | Teals and cyans |
| Lightness | dark (37%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Charcoal (#264653) |
| Black text | 2.06:1 |
| White text | 10.17:1 |
Values
| HEX | #21474A |
| RGB | rgb(33, 71, 74) |
| HSL | hsl(184, 38%, 21%) |
| OKLCH | oklch(37.1% 0.043 202.2) |
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 #21474A | 10.17:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #21474A | 2.06:1 | Fails | Lc 10.4 | Not readable |
| #21474A text on white | 10.17:1 | AAA | Lc 93.5 | Preferred for body text |
| #21474A text on black | 2.06:1 | Fails | Lc -9.0 | 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
#E3ECEC
oklch(93.6% 0.01 197)
-
Step 200
200
#CCDDDE
oklch(88.5% 0.018 201.1)
-
Step 300
300
#A9C7CA
oklch(80.8% 0.033 203.9)
-
Step 400
400
#7AABAF
oklch(70.8% 0.052 202.4)
-
Step 500
500
#55969B
oklch(63.2% 0.067 202)
-
Step 600
600
#378086
oklch(55.6% 0.073 202.6)
-
Step 700
700
#286C71
oklch(49.1% 0.068 202)
-
Step 800
800
#23585C
oklch(42.7% 0.056 202.1)
-
Step 900
900 (this color)
#21474A
oklch(37.1% 0.043 202.2)
-
Step 950
950
#152A2C
oklch(26.8% 0.027 203.5)
#21474A 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) | #42444A | 0.044 |
| Deuteranopia (no green cones) | #3B3F4A | 0.040 |
| Tritanopia (no blue cones) | #074A48 | 0.020 |
| Achromatopsia (no color) | #414141 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21474A
#21474A
oklch(37.1% 0.043 202.2)
- #553736
#553736
oklch(37.2% 0.043 21.5)
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 #21474A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal #264653 ΔE 0.019
- Dark Teal #014D4E ΔE 0.024
- Dark Slate Gray #2F4F4F ΔE 0.032
- Dark Grey Blue #29465B ΔE 0.033
- Charcoal Grey #3C4142 ΔE 0.037
- Dark Blue Green #005249 ΔE 0.040
- Dark Blue Grey #1F3B4D ΔE 0.043
- Onyx #343A40 ΔE 0.044
Use #21474A 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.