#21498E
Closest named color: Cobalt (#1E488F). oklch(41.7% 0.123 260.5), rgb(33, 73, 142).
Aa
White text reads best on this color (8.71:1).
About this color
#21498E is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.123 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.005 away. White text reads best on it, at 8.71:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.40:1 |
| White text | 8.71:1 |
Values
| HEX | #21498E |
| RGB | rgb(33, 73, 142) |
| HSL | hsl(218, 62%, 34%) |
| OKLCH | oklch(41.7% 0.123 260.5) |
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 #21498E | 8.71:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #21498E | 2.40:1 | Fails | Lc 14.5 | Not readable |
| #21498E text on white | 8.71:1 | AAA | Lc 89.5 | Fine for body text |
| #21498E text on black | 2.40:1 | Fails | Lc -12.7 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CADAF4
oklch(88.4% 0.04 260.1)
-
Step 300
300
#A6C2F0
oklch(80.9% 0.072 260.3)
-
Step 400
400
#76A1E8
oklch(70.7% 0.115 260.1)
-
Step 500
500
#5387E1
oklch(63% 0.147 260.6)
-
Step 600
600
#386FCF
oklch(55.6% 0.16 260.7)
-
Step 700
700
#2A5CB3
oklch(49% 0.149 260.6)
-
Step 800
800 (this color)
#21498E
oklch(41.7% 0.123 260.5)
-
Step 900
900
#224074
oklch(37.7% 0.096 260.6)
-
Step 950
950
#142644
oklch(27% 0.061 260.1)
#21498E 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) | #235091 | 0.020 |
| Deuteranopia (no green cones) | #04468D | 0.021 |
| Tritanopia (no blue cones) | #005964 | 0.096 |
| Achromatopsia (no color) | #4B4B4B | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21498E
#21498E
oklch(41.7% 0.123 260.5)
- #644600
#644600
oklch(41.6% 0.086 80.6)
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 #21498E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.005
- Light Navy #155084 ΔE 0.029
- Dusk Blue #26538D ΔE 0.030
- Twilight Blue #0A437A ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.042
- Blueberry #464196 ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.055
- Light Navy Blue #2E5A88 ΔE 0.056
Use #21498E 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.