#0F388E
Closest named color: Cobalt (#1E488F). oklch(37.3% 0.15 262.5), rgb(15, 56, 142).
Aa
White text reads best on this color (10.62:1).
About this color
#0F388E is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.150 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.047 away. White text reads best on it, at 10.62:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 1.97:1 |
| White text | 10.62:1 |
Values
| HEX | #0F388E |
| RGB | rgb(15, 56, 142) |
| HSL | hsl(221, 81%, 31%) |
| OKLCH | oklch(37.3% 0.15 262.5) |
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 #0F388E | 10.62:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #0F388E | 1.97:1 | Fails | Lc 10.0 | Not readable |
| #0F388E text on white | 10.62:1 | AAA | Lc 94.0 | Preferred for body text |
| #0F388E text on black | 1.97:1 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#DFEAFF
oklch(93.5% 0.031 263.5)
-
Step 200
200
#C6DAFF
oklch(88.5% 0.056 262.8)
-
Step 300
300
#A0C1FF
oklch(80.9% 0.095 262.7)
-
Step 400
400
#6C9EFF
oklch(70.7% 0.152 262.5)
-
Step 500
500
#4481FF
oklch(63% 0.198 262.7)
-
Step 600
600
#1561FF
oklch(55.6% 0.245 262.5)
-
Step 700
700
#034DE1
oklch(49.1% 0.233 262.5)
-
Step 800
800
#0841B5
oklch(42.7% 0.191 262.4)
-
Step 900
900 (this color)
#0F388E
oklch(37.3% 0.15 262.5)
-
Step 950
950
#0B2354
oklch(27.2% 0.094 262.4)
#0F388E 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) | #004491 | 0.031 |
| Deuteranopia (no green cones) | #00398C | 0.008 |
| Tritanopia (no blue cones) | #004E5D | 0.115 |
| Achromatopsia (no color) | #3E3E3E | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0F388E
#0F388E
oklch(37.3% 0.15 262.5)
- #543C00
#543C00
oklch(37.3% 0.077 83.1)
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 #0F388E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.047
- Twilight Blue #0A437A ΔE 0.047
- Sapphire #2138AB ΔE 0.051
- Marine Blue #01386A ΔE 0.063
- Royal #0C1793 ΔE 0.067
- Light Navy #155084 ΔE 0.072
- Dark Slate Blue #483D8B ΔE 0.074
- Blueberry #464196 ΔE 0.074
Use #0F388E 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.