#10448B
Closest named color: Cobalt (#1E488F). oklch(39.8% 0.13 258), rgb(16, 68, 139).
Aa
White text reads best on this color (9.45:1).
About this color
#10448B is a dark, moderately saturated blue. In OKLCH its lightness is 40%, 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 0.018 away. White text reads best on it, at 9.45:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.22:1 |
| White text | 9.45:1 |
Values
| HEX | #10448B |
| RGB | rgb(16, 68, 139) |
| HSL | hsl(215, 79%, 30%) |
| OKLCH | oklch(39.8% 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 #10448B | 9.45:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #10448B | 2.22:1 | Fails | Lc 12.6 | Not readable |
| #10448B text on white | 9.45:1 | AAA | Lc 91.3 | Preferred for body text |
| #10448B text on black | 2.22:1 | Fails | Lc -11.0 | 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
#60A1FF
oklch(70.8% 0.154 257.7)
-
Step 500
500
#2D85FF
oklch(63.2% 0.199 257.9)
-
Step 600
600
#006CE8
oklch(55.6% 0.205 258)
-
Step 700
700
#005AC4
oklch(49% 0.181 258)
-
Step 800
800
#004AA3
oklch(42.8% 0.158 257.9)
-
Step 900
900 (this color)
#10448B
oklch(39.8% 0.13 258)
-
Step 950
950
#08254E
oklch(27% 0.083 258)
#10448B 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) | #174C8E | 0.024 |
| Deuteranopia (no green cones) | #00418A | 0.012 |
| Tritanopia (no blue cones) | #005561 | 0.097 |
| Achromatopsia (no color) | #464646 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10448B
#10448B
oklch(39.8% 0.13 258)
- #5F4000
#5F4000
oklch(39.7% 0.083 77.7)
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 #10448B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.018
- Twilight Blue #0A437A ΔE 0.029
- Light Navy #155084 ΔE 0.039
- Dusk Blue #26538D ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.051
- Sapphire #2138AB ΔE 0.061
- Blueberry #464196 ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.064
Use #10448B 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.