#0F51AC
Closest named color: Cobalt (#1E488F). oklch(45.3% 0.159 258.6), rgb(15, 81, 172).
Aa
White text reads best on this color (7.51:1).
About this color
#0F51AC is a medium-dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.159 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.051 away. White text reads best on it, at 7.51:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.79:1 |
| White text | 7.51:1 |
Values
| HEX | #0F51AC |
| RGB | rgb(15, 81, 172) |
| HSL | hsl(215, 84%, 37%) |
| OKLCH | oklch(45.3% 0.159 258.6) |
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 #0F51AC | 7.51:1 | AAA | Lc -90.3 | Preferred for body text |
| Black text on #0F51AC | 2.79:1 | Fails | Lc 18.5 | Dividers and decoration only |
| #0F51AC text on white | 7.51:1 | AAA | Lc 85.5 | Fine for body text |
| #0F51AC text on black | 2.79:1 | Fails | Lc -16.6 | 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 800.
-
Step 50
50
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C5DBFC
oklch(88.6% 0.051 258.4)
-
Step 300
300
#9CC2FD
oklch(80.8% 0.094 259)
-
Step 400
400
#64A0FC
oklch(70.6% 0.149 258.7)
-
Step 500
500
#3785FA
oklch(63.1% 0.191 258.7)
-
Step 600
600
#086BE9
oklch(55.6% 0.207 258.6)
-
Step 700
700
#0059C7
oklch(49% 0.186 258.6)
-
Step 800
800 (this color)
#0F51AC
oklch(45.3% 0.159 258.6)
-
Step 900
900
#103E82
oklch(37.6% 0.125 258.9)
-
Step 950
950
#0B254C
oklch(27% 0.079 258.6)
#0F51AC 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) | #095CAF | 0.030 |
| Deuteranopia (no green cones) | #004EAA | 0.011 |
| Tritanopia (no blue cones) | #006876 | 0.122 |
| Achromatopsia (no color) | #545454 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0F51AC
#0F51AC
oklch(45.3% 0.159 258.6)
- #724E00
#724E00
oklch(45.2% 0.094 78.1)
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 #0F51AC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.051
- Dusk Blue #26538D ΔE 0.053
- Blue Blue #2242C7 ΔE 0.056
- Sapphire #2138AB ΔE 0.059
- Denim Blue #3B5B92 ΔE 0.065
- Light Navy #155084 ΔE 0.065
- Blueberry #464196 ΔE 0.068
- Light Navy Blue #2E5A88 ΔE 0.071
Use #0F51AC 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.