#21519B
Closest named color: Dusk Blue (#26538D). oklch(44.4% 0.132 259), rgb(33, 81, 155).
Aa
White text reads best on this color (7.73:1).
About this color
#21519B is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.132 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.025 away. White text reads best on it, at 7.73:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.71:1 |
| White text | 7.73:1 |
Values
| HEX | #21519B |
| RGB | rgb(33, 81, 155) |
| HSL | hsl(216, 65%, 37%) |
| OKLCH | oklch(44.4% 0.132 259) |
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 #21519B | 7.73:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #21519B | 2.71:1 | Fails | Lc 17.6 | Dividers and decoration only |
| #21519B text on white | 7.73:1 | AAA | Lc 86.5 | Fine for body text |
| #21519B text on black | 2.71:1 | Fails | Lc -15.6 | 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 800.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A3C2F3
oklch(80.9% 0.077 259.4)
-
Step 400
400
#71A1ED
oklch(70.7% 0.124 259.3)
-
Step 500
500
#4B88E7
oklch(63.2% 0.157 259)
-
Step 600
600
#2D6FD5
oklch(55.6% 0.171 259.1)
-
Step 700
700
#1F5CB9
oklch(49.1% 0.16 259.1)
-
Step 800
800 (this color)
#21519B
oklch(44.4% 0.132 259)
-
Step 900
900
#1D4077
oklch(37.7% 0.102 259.2)
-
Step 950
950
#122646
oklch(27.1% 0.065 259.4)
#21519B 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) | #29599E | 0.025 |
| Deuteranopia (no green cones) | #064D9A | 0.020 |
| Tritanopia (no blue cones) | #00636E | 0.103 |
| Achromatopsia (no color) | #535353 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21519B
#21519B
oklch(44.4% 0.132 259)
- #6F4C00
#6F4C00
oklch(44.4% 0.092 78.3)
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 #21519B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.025
- Cobalt #1E488F ΔE 0.031
- Light Navy #155084 ΔE 0.040
- Denim Blue #3B5B92 ΔE 0.045
- Light Navy Blue #2E5A88 ΔE 0.046
- Deep Sea Blue #015482 ΔE 0.047
- Blueberry #464196 ΔE 0.055
- Twilight #4E518B ΔE 0.057
Use #21519B 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.