#0F28AC
Closest named color: Ultramarine (#2000B1). oklch(37.6% 0.206 265.8), rgb(15, 40, 172).
Aa
White text reads best on this color (10.94:1).
About this color
#0F28AC is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.206 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Ultramarine (#2000B1), ΔE 0.038 away. White text reads best on it, at 10.94:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.206) |
| Temperature | cool |
| Nearest name | Ultramarine (#2000B1) |
| Black text | 1.91:1 |
| White text | 10.94:1 |
Values
| HEX | #0F28AC |
| RGB | rgb(15, 40, 172) |
| HSL | hsl(230, 84%, 37%) |
| OKLCH | oklch(37.6% 0.206 265.8) |
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 #0F28AC | 10.94:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #0F28AC | 1.91:1 | Fails | Lc 9.9 | Not readable |
| #0F28AC text on white | 10.94:1 | AAA | Lc 94.0 | Preferred for body text |
| #0F28AC text on black | 1.91:1 | Fails | Lc -8.6 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#739CFF
oklch(70.7% 0.152 265.7)
-
Step 500
500
#507FFF
oklch(63.1% 0.197 265.8)
-
Step 600
600
#2E5DFF
oklch(55.5% 0.245 265.8)
-
Step 700
700
#1835FF
oklch(49.1% 0.287 265.7)
-
Step 800
800
#1221DC
oklch(42.7% 0.265 265.8)
-
Step 900
900 (this color)
#0F28AC
oklch(37.6% 0.206 265.8)
-
Step 950
950
#081B65
oklch(27.1% 0.131 265.7)
#0F28AC 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) | #0044B0 | 0.058 |
| Deuteranopia (no green cones) | #0035AA | 0.024 |
| Tritanopia (no blue cones) | #005069 | 0.155 |
| Achromatopsia (no color) | #3D3D3D | 0.207 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0F28AC
#0F28AC
oklch(37.6% 0.206 265.8)
- #543E00
#543E00
oklch(37.8% 0.077 85.9)
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 #0F28AC, closest first.
No curated palette has a color within ΔE 0.04 of #0F28AC.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ultramarine #2000B1 ΔE 0.038
- Sapphire #2138AB ΔE 0.039
- Cobalt Blue #030AA7 ΔE 0.044
- Indigo Blue #3A18B1 ΔE 0.053
- True Blue #010FCC ΔE 0.055
- Royal #0C1793 ΔE 0.056
- Medium Blue #0000CD ΔE 0.060
- Ultramarine Blue #1805DB ΔE 0.076
Use #0F28AC 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.