#0A2CD4
Closest named color: Ultramarine Blue (#1805DB). oklch(42.7% 0.249 264.9), rgb(10, 44, 212).
Aa
White text reads best on this color (9.03:1).
About this color
#0A2CD4 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.249 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Ultramarine Blue (#1805DB), ΔE 0.031 away. White text reads best on it, at 9.03:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.249) |
| Temperature | cool |
| Nearest name | Ultramarine Blue (#1805DB) |
| Black text | 2.32:1 |
| White text | 9.03:1 |
Values
| HEX | #0A2CD4 |
| RGB | rgb(10, 44, 212) |
| HSL | hsl(230, 91%, 44%) |
| OKLCH | oklch(42.7% 0.249 264.9) |
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 #0A2CD4 | 9.03:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #0A2CD4 | 2.32:1 | Fails | Lc 15.0 | Not readable |
| #0A2CD4 text on white | 9.03:1 | AAA | Lc 89.0 | Fine for body text |
| #0A2CD4 text on black | 2.32:1 | Fails | Lc -13.2 | 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 800.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C7D9FF
oklch(88.4% 0.056 265.2)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#719CFF
oklch(70.6% 0.153 265)
-
Step 500
500
#4D80FF
oklch(63.2% 0.197 264.8)
-
Step 600
600
#295EFF
oklch(55.5% 0.245 264.9)
-
Step 700
700
#0E37FF
oklch(49.1% 0.287 264.8)
-
Step 800
800 (this color)
#0A2CD4
oklch(42.7% 0.249 264.9)
-
Step 900
900
#0C2DA6
oklch(37.6% 0.195 264.9)
-
Step 950
950
#071D61
oklch(27% 0.123 264.7)
#0A2CD4 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) | #0053D9 | 0.076 |
| Deuteranopia (no green cones) | #003FD1 | 0.032 |
| Tritanopia (no blue cones) | #006180 | 0.187 |
| Achromatopsia (no color) | #494949 | 0.250 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A2CD4
#0A2CD4
oklch(42.7% 0.249 264.9)
- #654A00
#654A00
oklch(42.7% 0.087 84.5)
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 #0A2CD4, closest first.
No curated palette has a color within ΔE 0.04 of #0A2CD4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ultramarine Blue #1805DB ΔE 0.031
- Pure Blue #0203E2 ΔE 0.038
- True Blue #010FCC ΔE 0.040
- Medium Blue #0000CD ΔE 0.047
- Blue Blue #2242C7 ΔE 0.048
- Strong Blue #0C06F7 ΔE 0.056
- Rich Blue #021BF9 ΔE 0.058
- Primary Blue #0804F9 ΔE 0.060
Use #0A2CD4 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.