#21719E
Closest named color: Ocean Blue (#03719C). oklch(52.3% 0.103 238.6), rgb(33, 113, 158).
Aa
White text reads best on this color (5.35:1).
About this color
#21719E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.103 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.011 away. White text reads best on it, at 5.35:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 3.92:1 |
| White text | 5.35:1 |
Values
| HEX | #21719E |
| RGB | rgb(33, 113, 158) |
| HSL | hsl(202, 65%, 37%) |
| OKLCH | oklch(52.3% 0.103 238.6) |
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 #21719E | 5.35:1 | AA | Lc -81.7 | Fine for body text |
| Black text on #21719E | 3.92:1 | AA large text | Lc 27.8 | Dividers and decoration only |
| #21719E text on white | 5.35:1 | AA | Lc 76.3 | Fine for body text |
| #21719E text on black | 3.92:1 | AA large text | Lc -25.4 | Dividers and decoration only |
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 700.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEA
oklch(88.5% 0.028 239.7)
-
Step 300
300
#A4C6DE
oklch(81% 0.05 239)
-
Step 400
400
#71A8CD
oklch(70.7% 0.079 238.8)
-
Step 500
500
#4792C0
oklch(63.2% 0.102 238.2)
-
Step 600
600
#237BAC
oklch(55.5% 0.11 238.5)
-
Step 700
700 (this color)
#21719E
oklch(52.3% 0.103 238.6)
-
Step 800
800
#155578
oklch(42.8% 0.085 238.1)
-
Step 900
900
#1A4661
oklch(37.7% 0.067 239.1)
-
Step 950
950
#112939
oklch(27% 0.042 240.1)
#21719E 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) | #5C71A0 | 0.056 |
| Deuteranopia (no green cones) | #4B669D | 0.044 |
| Tritanopia (no blue cones) | #007C81 | 0.066 |
| Achromatopsia (no color) | #6B6B6B | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21719E
#21719E
oklch(52.3% 0.103 238.6)
- #955925
#955925
oklch(52.3% 0.103 58.2)
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 #21719E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.011
- Muted Blue #3B719F ΔE 0.019
- Sea Blue #047495 ΔE 0.022
- Flat Blue #3C73A8 ΔE 0.028
- Nice Blue #107AB0 ΔE 0.034
- Peacock Blue #016795 ΔE 0.035
- Dull Blue #49759C ΔE 0.037
- Ocean #017B92 ΔE 0.041
Use #21719E 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.