#21438F
Closest named color: Cobalt (#1E488F). oklch(40.4% 0.132 263.5), rgb(33, 67, 143).
Aa
White text reads best on this color (9.27:1).
About this color
#21438F is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.132 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.014 away. White text reads best on it, at 9.27:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.26:1 |
| White text | 9.27:1 |
Values
| HEX | #21438F |
| RGB | rgb(33, 67, 143) |
| HSL | hsl(221, 63%, 35%) |
| OKLCH | oklch(40.4% 0.132 263.5) |
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 #21438F | 9.27:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #21438F | 2.26:1 | Fails | Lc 13.0 | Not readable |
| #21438F text on white | 9.27:1 | AAA | Lc 91.0 | Preferred for body text |
| #21438F text on black | 2.26:1 | Fails | Lc -11.3 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CBDAF6
oklch(88.6% 0.042 263)
-
Step 300
300
#A7C1F3
oklch(80.9% 0.077 263.3)
-
Step 400
400
#789FEE
oklch(70.7% 0.124 263.5)
-
Step 500
500
#5685E8
oklch(63.1% 0.158 263.4)
-
Step 600
600
#3C6CD6
oklch(55.6% 0.171 263.5)
-
Step 700
700
#2E5ABA
oklch(49.2% 0.16 263.2)
-
Step 800
800 (this color)
#21438F
oklch(40.4% 0.132 263.5)
-
Step 900
900
#243E78
oklch(37.6% 0.104 263.9)
-
Step 950
950
#152546
oklch(27% 0.065 263.2)
#21438F 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) | #104C92 | 0.025 |
| Deuteranopia (no green cones) | #00428D | 0.021 |
| Tritanopia (no blue cones) | #005562 | 0.104 |
| Achromatopsia (no color) | #474747 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21438F
#21438F
oklch(40.4% 0.132 263.5)
- #5E4400
#5E4400
oklch(40.4% 0.083 83.7)
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 #21438F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.014
- Twilight Blue #0A437A ΔE 0.040
- Light Navy #155084 ΔE 0.044
- Dusk Blue #26538D ΔE 0.047
- Blueberry #464196 ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.052
- Sapphire #2138AB ΔE 0.053
- Deep Sea Blue #015482 ΔE 0.057
Use #21438F 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.