#21407C
Closest named color: Twilight Blue (#0A437A). oklch(38.3% 0.108 262), rgb(33, 64, 124).
Aa
White text reads best on this color (10.05:1).
About this color
#21407C is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.108 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.018 away. White text reads best on it, at 10.05:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.08:1 |
| White text | 10.05:1 |
Values
| HEX | #21407C |
| RGB | rgb(33, 64, 124) |
| HSL | hsl(220, 58%, 31%) |
| OKLCH | oklch(38.3% 0.108 262) |
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 #21407C | 10.05:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #21407C | 2.08:1 | Fails | Lc 10.9 | Not readable |
| #21407C text on white | 10.05:1 | AAA | Lc 93.0 | Preferred for body text |
| #21407C text on black | 2.08:1 | Fails | Lc -9.4 | 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
#E1EAFA
oklch(93.5% 0.024 262.1)
-
Step 200
200
#C9DAF8
oklch(88.5% 0.045 261.9)
-
Step 300
300
#A4C1F6
oklch(80.8% 0.082 262.3)
-
Step 400
400
#739FF1
oklch(70.6% 0.13 262.1)
-
Step 500
500
#4F85ED
oklch(63.1% 0.167 262.1)
-
Step 600
600
#336CDB
oklch(55.6% 0.181 261.9)
-
Step 700
700
#2659BE
oklch(49% 0.168 262.1)
-
Step 800
800
#214A9A
oklch(42.8% 0.139 262)
-
Step 900
900 (this color)
#21407C
oklch(38.3% 0.108 262)
-
Step 950
950
#132548
oklch(27% 0.069 262.3)
#21407C 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) | #21467E | 0.018 |
| Deuteranopia (no green cones) | #0C3E7B | 0.018 |
| Tritanopia (no blue cones) | #004E58 | 0.086 |
| Achromatopsia (no color) | #424242 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21407C
#21407C
oklch(38.3% 0.108 262)
- #583E00
#583E00
oklch(38.3% 0.079 81.8)
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 #21407C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.018
- Cobalt #1E488F ΔE 0.037
- Light Navy #155084 ΔE 0.046
- Marine Blue #01386A ΔE 0.047
- Deep Sea Blue #015482 ΔE 0.058
- Dusk Blue #26538D ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.060
- Dark Grey Blue #29465B ΔE 0.064
Use #21407C 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.