#21499D
Closest named color: Cobalt (#1E488F). oklch(42.8% 0.144 262.7), rgb(33, 73, 157).
Aa
White text reads best on this color (8.38:1).
About this color
#21499D is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.144 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.023 away. White text reads best on it, at 8.38:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.50:1 |
| White text | 8.38:1 |
Values
| HEX | #21499D |
| RGB | rgb(33, 73, 157) |
| HSL | hsl(221, 65%, 37%) |
| OKLCH | oklch(42.8% 0.144 262.7) |
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 #21499D | 8.38:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #21499D | 2.50:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #21499D text on white | 8.38:1 | AAA | Lc 88.4 | Fine for body text |
| #21499D text on black | 2.50:1 | Fails | Lc -13.7 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C9DAF9
oklch(88.5% 0.047 262.5)
-
Step 300
300
#A4C1F8
oklch(80.9% 0.084 263)
-
Step 400
400
#739FF5
oklch(70.8% 0.135 262.8)
-
Step 500
500
#4F84F0
oklch(63.1% 0.172 262.8)
-
Step 600
600
#336BDF
oklch(55.7% 0.187 262.6)
-
Step 700
700
#2658C2
oklch(49.1% 0.175 262.7)
-
Step 800
800 (this color)
#21499D
oklch(42.8% 0.144 262.7)
-
Step 900
900
#1F3E7C
oklch(37.7% 0.112 262.4)
-
Step 950
950
#132549
oklch(27.1% 0.071 262.6)
#21499D 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) | #0B54A0 | 0.030 |
| Deuteranopia (no green cones) | #00489B | 0.019 |
| Tritanopia (no blue cones) | #005D6C | 0.111 |
| Achromatopsia (no color) | #4E4E4E | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21499D
#21499D
oklch(42.8% 0.144 262.7)
- #674A00
#674A00
oklch(42.9% 0.088 82.7)
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 #21499D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.023
- Dusk Blue #26538D ΔE 0.042
- Blueberry #464196 ΔE 0.047
- Sapphire #2138AB ΔE 0.047
- Light Navy #155084 ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.059
- Deep Sea Blue #015482 ΔE 0.060
- Twilight Blue #0A437A ΔE 0.063
Use #21499D 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.