#0F51A0
Closest named color: Cobalt (#1E488F). oklch(44.4% 0.143 256.5), rgb(15, 81, 160).
Aa
White text reads best on this color (7.76:1).
About this color
#0F51A0 is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.143 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.035 away. White text reads best on it, at 7.76:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.70:1 |
| White text | 7.76:1 |
Values
| HEX | #0F51A0 |
| RGB | rgb(15, 81, 160) |
| HSL | hsl(213, 83%, 34%) |
| OKLCH | oklch(44.4% 0.143 256.5) |
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 #0F51A0 | 7.76:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #0F51A0 | 2.70:1 | Fails | Lc 17.6 | Dividers and decoration only |
| #0F51A0 text on white | 7.76:1 | AAA | Lc 86.4 | Fine for body text |
| #0F51A0 text on black | 2.70:1 | Fails | Lc -15.7 | 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 800.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF8
oklch(88.5% 0.046 256.5)
-
Step 300
300
#9EC3F6
oklch(80.9% 0.083 256.5)
-
Step 400
400
#67A2F2
oklch(70.6% 0.133 256.4)
-
Step 500
500
#3B88EE
oklch(63% 0.171 256.7)
-
Step 600
600
#106FDC
oklch(55.5% 0.185 256.6)
-
Step 700
700
#005DBE
oklch(49.2% 0.17 256.3)
-
Step 800
800 (this color)
#0F51A0
oklch(44.4% 0.143 256.5)
-
Step 900
900
#12407B
oklch(37.6% 0.112 256.7)
-
Step 950
950
#0D2648
oklch(27% 0.07 257)
#0F51A0 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) | #2159A3 | 0.027 |
| Deuteranopia (no green cones) | #004D9E | 0.014 |
| Tritanopia (no blue cones) | #006471 | 0.106 |
| Achromatopsia (no color) | #525252 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0F51A0
#0F51A0
oklch(44.4% 0.143 256.5)
- #704B00
#704B00
oklch(44.3% 0.093 76.4)
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 #0F51A0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.035
- Dusk Blue #26538D ΔE 0.035
- Light Navy #155084 ΔE 0.046
- Deep Sea Blue #015482 ΔE 0.052
- Denim Blue #3B5B92 ΔE 0.055
- Light Navy Blue #2E5A88 ΔE 0.056
- Blueberry #464196 ΔE 0.063
- Sapphire #2138AB ΔE 0.064
Use #0F51A0 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.