#21409B
Closest named color: Cobalt (#1E488F). oklch(40.8% 0.153 265.6), rgb(33, 64, 155).
Aa
White text reads best on this color (9.24:1).
About this color
#21409B is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.153 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.030 away. White text reads best on it, at 9.24:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.27:1 |
| White text | 9.24:1 |
Values
| HEX | #21409B |
| RGB | rgb(33, 64, 155) |
| HSL | hsl(225, 65%, 37%) |
| OKLCH | oklch(40.8% 0.153 265.6) |
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 #21409B | 9.24:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #21409B | 2.27:1 | Fails | Lc 13.2 | Not readable |
| #21409B text on white | 9.24:1 | AAA | Lc 90.8 | Preferred for body text |
| #21409B text on black | 2.27:1 | Fails | Lc -11.5 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FB
oklch(88.5% 0.05 266.5)
-
Step 300
300
#A5C0FB
oklch(80.9% 0.089 265.4)
-
Step 400
400
#769DFA
oklch(70.8% 0.143 265.7)
-
Step 500
500
#5381F7
oklch(63.1% 0.183 265.4)
-
Step 600
600
#3A67E6
oklch(55.7% 0.199 265.5)
-
Step 700
700
#2D54C8
oklch(49.1% 0.186 265.6)
-
Step 800
800 (this color)
#21409B
oklch(40.8% 0.153 265.6)
-
Step 900
900
#233C80
oklch(37.7% 0.119 265.7)
-
Step 950
950
#14244B
oklch(27.1% 0.075 265)
#21409B 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) | #004D9E | 0.035 |
| Deuteranopia (no green cones) | #004299 | 0.019 |
| Tritanopia (no blue cones) | #005767 | 0.120 |
| Achromatopsia (no color) | #474747 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21409B
#21409B
oklch(40.8% 0.153 265.6)
- #5E4500
#5E4500
oklch(40.7% 0.083 84.9)
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 #21409B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.030
- Sapphire #2138AB ΔE 0.032
- Blueberry #464196 ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.057
- Twilight Blue #0A437A ΔE 0.059
- Dusk Blue #26538D ΔE 0.060
- Light Navy #155084 ΔE 0.062
- Blue Blue #2242C7 ΔE 0.071
Use #21409B 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.