#0F438A
Closest named color: Cobalt (#1E488F). oklch(39.4% 0.13 258), rgb(15, 67, 138).
Aa
White text reads best on this color (9.58:1).
About this color
#0F438A is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.130 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.021 away. White text reads best on it, at 9.58:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.19:1 |
| White text | 9.58:1 |
Values
| HEX | #0F438A |
| RGB | rgb(15, 67, 138) |
| HSL | hsl(215, 80%, 30%) |
| OKLCH | oklch(39.4% 0.13 258) |
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 #0F438A | 9.58:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #0F438A | 2.19:1 | Fails | Lc 12.3 | Not readable |
| #0F438A text on white | 9.58:1 | AAA | Lc 91.7 | Preferred for body text |
| #0F438A text on black | 2.19:1 | Fails | Lc -10.7 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C3DBFD
oklch(88.5% 0.054 257.1)
-
Step 300
300
#9AC3FF
oklch(81% 0.096 257.8)
-
Step 400
400
#60A0FF
oklch(70.6% 0.155 258.1)
-
Step 500
500
#2D85FF
oklch(63.2% 0.199 257.9)
-
Step 600
600
#006CE8
oklch(55.6% 0.205 258)
-
Step 700
700
#005AC5
oklch(49.1% 0.183 258.1)
-
Step 800
800
#004AA3
oklch(42.8% 0.158 257.9)
-
Step 900
900 (this color)
#0F438A
oklch(39.4% 0.13 258)
-
Step 950
950
#08254E
oklch(27% 0.083 258)
#0F438A 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) | #154B8D | 0.024 |
| Deuteranopia (no green cones) | #004089 | 0.012 |
| Tritanopia (no blue cones) | #005460 | 0.097 |
| Achromatopsia (no color) | #454545 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0F438A
#0F438A
oklch(39.4% 0.13 258)
- #5E4000
#5E4000
oklch(39.5% 0.082 78.6)
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 #0F438A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.021
- Twilight Blue #0A437A ΔE 0.027
- Light Navy #155084 ΔE 0.042
- Dusk Blue #26538D ΔE 0.052
- Deep Sea Blue #015482 ΔE 0.054
- Sapphire #2138AB ΔE 0.062
- Marine Blue #01386A ΔE 0.063
- Blueberry #464196 ΔE 0.064
Use #0F438A 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.