#21576B
Closest named color: Petrol (#005F6A). oklch(43% 0.065 225.9), rgb(33, 87, 107).
Aa
White text reads best on this color (7.95:1).
About this color
#21576B is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.065 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.028 away. White text reads best on it, at 7.95:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.64:1 |
| White text | 7.95:1 |
Values
| HEX | #21576B |
| RGB | rgb(33, 87, 107) |
| HSL | hsl(196, 53%, 27%) |
| OKLCH | oklch(43% 0.065 225.9) |
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 #21576B | 7.95:1 | AAA | Lc -92.1 | Preferred for body text |
| Black text on #21576B | 2.64:1 | Fails | Lc 16.6 | Dividers and decoration only |
| #21576B text on white | 7.95:1 | AAA | Lc 87.4 | Fine for body text |
| #21576B text on black | 2.64:1 | Fails | Lc -14.8 | 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 800.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3ECEF
oklch(93.7% 0.01 219.6)
-
Step 200
200
#CBDCE4
oklch(88.4% 0.021 227.6)
-
Step 300
300
#A8C6D4
oklch(80.9% 0.038 227.7)
-
Step 400
400
#77A9BE
oklch(70.7% 0.061 226)
-
Step 500
500
#5293AD
oklch(63% 0.077 226.1)
-
Step 600
600
#327D99
oklch(55.5% 0.085 226.2)
-
Step 700
700
#246A83
oklch(49.2% 0.079 225.7)
-
Step 800
800 (this color)
#21576B
oklch(43% 0.065 225.9)
-
Step 900
900
#204756
oklch(37.6% 0.051 225.8)
-
Step 950
950
#142A32
oklch(27.1% 0.032 223.6)
#21576B 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) | #4C556C | 0.049 |
| Deuteranopia (no green cones) | #424E6B | 0.043 |
| Tritanopia (no blue cones) | #005D5D | 0.038 |
| Achromatopsia (no color) | #515151 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21576B
#21576B
oklch(43% 0.065 225.9)
- #6D4430
#6D4430
oklch(42.9% 0.065 46.5)
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 #21576B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.028
- Deep Teal #00555A ΔE 0.035
- YInMn Blue #415A77 ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.044
- Dark Slate Gray #2F4F4F ΔE 0.046
- Light Navy Blue #2E5A88 ΔE 0.051
- Light Navy #155084 ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.054
Use #21576B 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.