#21436A
Closest named color: Twilight Blue (#0A437A). oklch(37.7% 0.078 253.3), rgb(33, 67, 106).
Aa
White text reads best on this color (10.11:1).
About this color
#21436A is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.078 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.031 away. White text reads best on it, at 10.11:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.07:1 |
| White text | 10.11:1 |
Values
| HEX | #21436A |
| RGB | rgb(33, 67, 106) |
| HSL | hsl(212, 53%, 27%) |
| OKLCH | oklch(37.7% 0.078 253.3) |
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 #21436A | 10.11:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #21436A | 2.07:1 | Fails | Lc 10.6 | Not readable |
| #21436A text on white | 10.11:1 | AAA | Lc 93.3 | Preferred for body text |
| #21436A text on black | 2.07:1 | Fails | Lc -9.2 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CBDBEF
oklch(88.6% 0.033 254)
-
Step 300
300
#A7C3E6
oklch(80.8% 0.058 254.2)
-
Step 400
400
#76A4DA
oklch(70.7% 0.094 253)
-
Step 500
500
#528CD0
oklch(63.1% 0.12 253.5)
-
Step 600
600
#3575BD
oklch(55.6% 0.13 253.4)
-
Step 700
700
#2762A3
oklch(49.1% 0.121 253.3)
-
Step 800
800
#225084
oklch(42.7% 0.1 253.5)
-
Step 900
900 (this color)
#21436A
oklch(37.7% 0.078 253.3)
-
Step 950
950
#14273E
oklch(26.9% 0.05 254.1)
#21436A 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) | #32456C | 0.022 |
| Deuteranopia (no green cones) | #283E69 | 0.016 |
| Tritanopia (no blue cones) | #004C51 | 0.063 |
| Achromatopsia (no color) | #424242 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21436A
#21436A
oklch(37.7% 0.078 253.3)
- #5A3A03
#5A3A03
oklch(37.7% 0.078 73.6)
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 #21436A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.031
- Dark Grey Blue #29465B ΔE 0.031
- Charcoal #264653 ΔE 0.044
- Marine Blue #01386A ΔE 0.045
- Prussian Blue #1D3557 ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.052
- Light Navy #155084 ΔE 0.053
- Deep Sea Blue #015482 ΔE 0.058
Use #21436A 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.