#21576D
Closest named color: Petrol (#005F6A). oklch(43.1% 0.067 228.3), rgb(33, 87, 109).
Aa
White text reads best on this color (7.92:1).
About this color
#21576D is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.067 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.030 away. White text reads best on it, at 7.92:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.64:1 |
| White text | 7.92:1 |
Values
| HEX | #21576D |
| RGB | rgb(33, 87, 109) |
| HSL | hsl(197, 54%, 28%) |
| OKLCH | oklch(43.1% 0.067 228.3) |
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 #21576D | 7.92:1 | AAA | Lc -92.0 | Preferred for body text |
| Black text on #21576D | 2.64:1 | Fails | Lc 16.7 | Dividers and decoration only |
| #21576D text on white | 7.92:1 | AAA | Lc 87.3 | Fine for body text |
| #21576D 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
#E3EBF0
oklch(93.5% 0.011 234.8)
-
Step 200
200
#CBDCE5
oklch(88.4% 0.022 230.6)
-
Step 300
300
#A7C6D5
oklch(80.9% 0.04 228.7)
-
Step 400
400
#77A9C0
oklch(70.8% 0.063 228.3)
-
Step 500
500
#5193B0
oklch(63.1% 0.08 228.5)
-
Step 600
600
#327D9B
oklch(55.6% 0.086 227.9)
-
Step 700
700
#246985
oklch(49.1% 0.081 228.9)
-
Step 800
800 (this color)
#21576D
oklch(43.1% 0.067 228.3)
-
Step 900
900
#204757
oklch(37.7% 0.052 227.4)
-
Step 950
950
#142A33
oklch(27.1% 0.033 226.5)
#21576D 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) | #4B556E | 0.048 |
| Deuteranopia (no green cones) | #414E6D | 0.042 |
| Tritanopia (no blue cones) | #005D5E | 0.040 |
| Achromatopsia (no color) | #515151 | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21576D
#21576D
oklch(43.1% 0.067 228.3)
- #6E442E
#6E442E
oklch(43% 0.067 48)
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 #21576D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.030
- Deep Teal #00555A ΔE 0.038
- YInMn Blue #415A77 ΔE 0.040
- Deep Sea Blue #015482 ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.047
- Dark Slate Gray #2F4F4F ΔE 0.049
- Light Navy #155084 ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.054
Use #21576D 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.