#21457F
Closest named color: Twilight Blue (#0A437A). oklch(39.6% 0.107 259.5), rgb(33, 69, 127).
Aa
White text reads best on this color (9.44:1).
About this color
#21457F is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.107 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.020 away. White text reads best on it, at 9.44:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.22:1 |
| White text | 9.44:1 |
Values
| HEX | #21457F |
| RGB | rgb(33, 69, 127) |
| HSL | hsl(217, 59%, 31%) |
| OKLCH | oklch(39.6% 0.107 259.5) |
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 #21457F | 9.44:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #21457F | 2.22:1 | Fails | Lc 12.4 | Not readable |
| #21457F text on white | 9.44:1 | AAA | Lc 91.6 | Preferred for body text |
| #21457F text on black | 2.22:1 | Fails | Lc -10.8 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DAF7
oklch(88.4% 0.045 259.9)
-
Step 300
300
#A2C2F5
oklch(80.9% 0.081 259.6)
-
Step 400
400
#70A1F0
oklch(70.8% 0.128 259.6)
-
Step 500
500
#4987EB
oklch(63.2% 0.164 259.5)
-
Step 600
600
#2B6ED9
oklch(55.6% 0.178 259.6)
-
Step 700
700
#1D5BBC
oklch(49% 0.165 259.5)
-
Step 800
800
#1B4B98
oklch(42.7% 0.137 259.7)
-
Step 900
900 (this color)
#21457F
oklch(39.6% 0.107 259.5)
-
Step 950
950
#112647
oklch(27.1% 0.067 259.1)
#21457F 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) | #284B81 | 0.020 |
| Deuteranopia (no green cones) | #17427E | 0.013 |
| Tritanopia (no blue cones) | #00535B | 0.086 |
| Achromatopsia (no color) | #464646 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21457F
#21457F
oklch(39.6% 0.107 259.5)
- #5E4100
#5E4100
oklch(39.8% 0.082 79.9)
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 #21457F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.020
- Cobalt #1E488F ΔE 0.027
- Light Navy #155084 ΔE 0.032
- Deep Sea Blue #015482 ΔE 0.044
- Dusk Blue #26538D ΔE 0.045
- Marine Blue #01386A ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.063
Use #21457F 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.