#0A37C5
Closest named color: Blue Blue (#2242C7). oklch(42.6% 0.222 264.3), rgb(10, 55, 197).
Aa
White text reads best on this color (8.87:1).
About this color
#0A37C5 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.222 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.031 away. White text reads best on it, at 8.87:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.222) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.36:1 |
| White text | 8.87:1 |
Values
| HEX | #0A37C5 |
| RGB | rgb(10, 55, 197) |
| HSL | hsl(226, 90%, 41%) |
| OKLCH | oklch(42.6% 0.222 264.3) |
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 #0A37C5 | 8.87:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #0A37C5 | 2.36:1 | Fails | Lc 14.9 | Not readable |
| #0A37C5 text on white | 8.87:1 | AAA | Lc 89.0 | Fine for body text |
| #0A37C5 text on black | 2.36:1 | 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
#C7DAFF
oklch(88.6% 0.055 263.7)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#709DFF
oklch(70.7% 0.152 264.2)
-
Step 500
500
#4A80FF
oklch(63.1% 0.198 264.2)
-
Step 600
600
#255FFF
oklch(55.6% 0.244 264.3)
-
Step 700
700
#0A40F5
oklch(49.1% 0.268 264.3)
-
Step 800
800 (this color)
#0A37C5
oklch(42.6% 0.222 264.3)
-
Step 900
900
#0F349B
oklch(37.8% 0.172 264.2)
-
Step 950
950
#09205B
oklch(27.1% 0.11 264.1)
#0A37C5 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) | #0053C9 | 0.061 |
| Deuteranopia (no green cones) | #0041C2 | 0.020 |
| Tritanopia (no blue cones) | #00607A | 0.168 |
| Achromatopsia (no color) | #4A4A4A | 0.223 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A37C5
#0A37C5
oklch(42.6% 0.222 264.3)
- #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 #0A37C5, closest first.
No curated palette has a color within ΔE 0.04 of #0A37C5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.031
- Sapphire #2138AB ΔE 0.044
- Majorelle Blue #3F37C9 ΔE 0.051
- True Blue #010FCC ΔE 0.053
- Ultramarine Blue #1805DB ΔE 0.056
- Medium Blue #0000CD ΔE 0.061
- Pure Blue #0203E2 ΔE 0.064
- Indigo Blue #3A18B1 ΔE 0.071
Use #0A37C5 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.