#21438C
Closest named color: Cobalt (#1E488F). oklch(40.2% 0.128 263.1), rgb(33, 67, 140).
Aa
White text reads best on this color (9.34:1).
About this color
#21438C is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.128 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 9.34:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.24:1 |
| White text | 9.34:1 |
Values
| HEX | #21438C |
| RGB | rgb(33, 67, 140) |
| HSL | hsl(221, 62%, 34%) |
| OKLCH | oklch(40.2% 0.128 263.1) |
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 #21438C | 9.34:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #21438C | 2.24:1 | Fails | Lc 12.8 | Not readable |
| #21438C text on white | 9.34:1 | AAA | Lc 91.2 | Preferred for body text |
| #21438C text on black | 2.24:1 | Fails | Lc -11.1 | 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 900.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFD
oklch(93.5% 0.028 263.4)
-
Step 200
200
#C7DAFD
oklch(88.5% 0.053 262.7)
-
Step 300
300
#A0C1FF
oklch(80.9% 0.095 262.7)
-
Step 400
400
#6D9EFF
oklch(70.8% 0.152 262.8)
-
Step 500
500
#4781FE
oklch(63.1% 0.196 263.2)
-
Step 600
600
#2A66ED
oklch(55.5% 0.213 263.1)
-
Step 700
700
#1E54CF
oklch(49.2% 0.199 263.1)
-
Step 800
800
#1A46A7
oklch(42.8% 0.164 263)
-
Step 900
900 (this color)
#21438C
oklch(40.2% 0.128 263.1)
-
Step 950
950
#10244D
oklch(27% 0.08 262.7)
#21438C 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) | #154C8F | 0.025 |
| Deuteranopia (no green cones) | #00428B | 0.021 |
| Tritanopia (no blue cones) | #005561 | 0.102 |
| Achromatopsia (no color) | #474747 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21438C
#21438C
oklch(40.2% 0.128 263.1)
- #5D4300
#5D4300
oklch(40.1% 0.082 83.4)
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 #21438C, 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 0.035
- Light Navy #155084 ΔE 0.041
- Dusk Blue #26538D ΔE 0.047
- Blueberry #464196 ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.052
- Deep Sea Blue #015482 ΔE 0.055
- Sapphire #2138AB ΔE 0.058
Use #21438C 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.