#0A51BB
Closest named color: Blue Blue (#2242C7). oklch(46.5% 0.179 259.9), rgb(10, 81, 187).
Aa
White text reads best on this color (7.22:1).
About this color
#0A51BB is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.179 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.039 away. White text reads best on it, at 7.22:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.179) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.90:1 |
| White text | 7.22:1 |
Values
| HEX | #0A51BB |
| RGB | rgb(10, 81, 187) |
| HSL | hsl(216, 90%, 39%) |
| OKLCH | oklch(46.5% 0.179 259.9) |
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 #0A51BB | 7.22:1 | AAA | Lc -89.2 | Fine for body text |
| Black text on #0A51BB | 2.90:1 | Fails | Lc 19.7 | Dividers and decoration only |
| #0A51BB text on white | 7.22:1 | AAA | Lc 84.3 | Fine for body text |
| #0A51BB text on black | 2.90:1 | Fails | Lc -17.7 | Dividers and decoration only |
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 700.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAFA
oklch(88.4% 0.049 260.9)
-
Step 300
300
#A0C2F9
oklch(80.9% 0.087 259.9)
-
Step 400
400
#6CA0F6
oklch(70.7% 0.138 260)
-
Step 500
500
#4385F3
oklch(63% 0.178 260)
-
Step 600
600
#236CE2
oklch(55.6% 0.194 260)
-
Step 700
700 (this color)
#0A51BB
oklch(46.5% 0.179 259.9)
-
Step 800
800
#154A9E
oklch(42.8% 0.148 259.8)
-
Step 900
900
#183F7E
oklch(37.8% 0.116 259.7)
-
Step 950
950
#0F254A
oklch(27% 0.074 260.2)
#0A51BB 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) | #005FBF | 0.036 |
| Deuteranopia (no green cones) | #0050B9 | 0.006 |
| Tritanopia (no blue cones) | #006C7E | 0.136 |
| Achromatopsia (no color) | #575757 | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A51BB
#0A51BB
oklch(46.5% 0.179 259.9)
- #755200
#755200
oklch(46.4% 0.096 80.1)
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 #0A51BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.039
- Sapphire #2138AB ΔE 0.063
- Majorelle Blue #3F37C9 ΔE 0.067
- Cobalt #1E488F ΔE 0.073
- Mid Blue #276AB3 ΔE 0.074
- Dusk Blue #26538D ΔE 0.076
- Warm Blue #4B57DB ΔE 0.079
- Blue With A Hint Of Purple #533CC6 ΔE 0.080
Use #0A51BB 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.