#0F509F
Closest named color: Cobalt (#1E488F). oklch(44.1% 0.143 256.7), rgb(15, 80, 159).
Aa
White text reads best on this color (7.86:1).
About this color
#0F509F is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.143 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.032 away. White text reads best on it, at 7.86:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.66:1 |
| White text | 7.86:1 |
Values
| HEX | #0F509F |
| RGB | rgb(15, 80, 159) |
| HSL | hsl(213, 83%, 34%) |
| OKLCH | oklch(44.1% 0.143 256.7) |
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 #0F509F | 7.86:1 | AAA | Lc -91.5 | Preferred for body text |
| Black text on #0F509F | 2.66:1 | Fails | Lc 17.3 | Dividers and decoration only |
| #0F509F text on white | 7.86:1 | AAA | Lc 86.7 | Fine for body text |
| #0F509F text on black | 2.66:1 | Fails | Lc -15.4 | 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
#68A2F2
oklch(70.7% 0.133 256.7)
-
Step 500
500
#3C88EE
oklch(63.1% 0.171 256.9)
-
Step 600
600
#126FDC
oklch(55.5% 0.185 256.7)
-
Step 700
700
#005CBF
oklch(49% 0.172 256.8)
-
Step 800
800 (this color)
#0F509F
oklch(44.1% 0.143 256.7)
-
Step 900
900
#13407B
oklch(37.6% 0.111 256.9)
-
Step 950
950
#0D2648
oklch(27% 0.07 257)
#0F509F 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) | #2058A2 | 0.026 |
| Deuteranopia (no green cones) | #004C9D | 0.014 |
| Tritanopia (no blue cones) | #006370 | 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°).
- #0F509F
#0F509F
oklch(44.1% 0.143 256.7)
- #6F4B00
#6F4B00
oklch(44.2% 0.092 77.2)
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 #0F509F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.032
- Dusk Blue #26538D ΔE 0.035
- Light Navy #155084 ΔE 0.045
- Deep Sea Blue #015482 ΔE 0.052
- Light Navy Blue #2E5A88 ΔE 0.057
- Denim Blue #3B5B92 ΔE 0.057
- Blueberry #464196 ΔE 0.062
- Sapphire #2138AB ΔE 0.062
Use #0F509F 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.