#21819F
Closest named color: Teal Blue (#01889F). oklch(56.3% 0.096 224), rgb(33, 129, 159).
Aa
Black text reads best on this color (4.70:1).
About this color
#21819F is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 56%, its chroma 0.096 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Blue (#01889F), ΔE 0.021 away. Black text reads best on it, at 4.70:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 4.70:1 |
| White text | 4.46:1 |
Values
| HEX | #21819F |
| RGB | rgb(33, 129, 159) |
| HSL | hsl(194, 66%, 38%) |
| OKLCH | oklch(56.3% 0.096 224) |
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 #21819F | 4.46:1 | AA large text | Lc -76.1 | Fine for body text |
| Black text on #21819F | 4.70:1 | AA | Lc 33.5 | Non-text elements, placeholder text |
| #21819F text on white | 4.46:1 | AA large text | Lc 70.6 | Content text, not long reading |
| #21819F text on black | 4.70:1 | AA | Lc -31.1 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E1ECF0
oklch(93.6% 0.013 221.4)
-
Step 200
200
#C9DDE5
oklch(88.5% 0.024 223.7)
-
Step 300
300
#A3C7D5
oklch(80.8% 0.043 223.5)
-
Step 400
400
#70AAC1
oklch(70.7% 0.069 225)
-
Step 500
500
#4595B1
oklch(63.1% 0.088 223.9)
-
Step 600
600 (this color)
#21819F
oklch(56.3% 0.096 224)
-
Step 700
700
#0C6B86
oklch(49.1% 0.089 224)
-
Step 800
800
#11576D
oklch(42.6% 0.074 224.5)
-
Step 900
900
#184858
oklch(37.7% 0.058 223.7)
-
Step 950
950
#102A34
oklch(27% 0.037 225.8)
#21819F 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) | #707EA1 | 0.075 |
| Deuteranopia (no green cones) | #5F729F | 0.065 |
| Tritanopia (no blue cones) | #008A8B | 0.049 |
| Achromatopsia (no color) | #777777 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21819F
#21819F
oklch(56.3% 0.096 224)
- #A46245
#A46245
oklch(56.4% 0.096 44.1)
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 #21819F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Blue #01889F ΔE 0.021
- Cerulean #457B9D ΔE 0.028
- Ocean #017B92 ΔE 0.028
- Blue NCS #118AB2 ΔE 0.034
- Stormy Blue #507B9C ΔE 0.037
- Nice Blue #107AB0 ΔE 0.039
- Dull Blue #49759C ΔE 0.041
- Sea Blue #047495 ΔE 0.042
Use #21819F 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.