#1A398E
Closest named color: Cobalt (#1E488F). oklch(37.9% 0.146 264.9), rgb(26, 57, 142).
Aa
White text reads best on this color (10.39:1).
About this color
#1A398E is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.146 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.041 away. White text reads best on it, at 10.39:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.01:1 |
| White text | 10.39:1 |
Values
| HEX | #1A398E |
| RGB | rgb(26, 57, 142) |
| HSL | hsl(224, 69%, 33%) |
| OKLCH | oklch(37.9% 0.146 264.9) |
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 #1A398E | 10.39:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #1A398E | 2.01:1 | Fails | Lc 10.4 | Not readable |
| #1A398E text on white | 10.39:1 | AAA | Lc 93.6 | Preferred for body text |
| #1A398E text on black | 2.01:1 | Fails | Lc -8.9 | 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
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C7D9FF
oklch(88.4% 0.056 265.2)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#719CFF
oklch(70.6% 0.153 265)
-
Step 500
500
#4D80FF
oklch(63.2% 0.197 264.8)
-
Step 600
600
#295FFE
oklch(55.6% 0.243 264.8)
-
Step 700
700
#1E4CDE
oklch(49.1% 0.227 264.9)
-
Step 800
800
#1A40B3
oklch(42.7% 0.187 264.9)
-
Step 900
900 (this color)
#1A398E
oklch(37.9% 0.146 264.9)
-
Step 950
950
#0F2253
oklch(27% 0.093 264.8)
#1A398E 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) | #004591 | 0.032 |
| Deuteranopia (no green cones) | #003B8C | 0.015 |
| Tritanopia (no blue cones) | #004F5D | 0.115 |
| Achromatopsia (no color) | #404040 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1A398E
#1A398E
oklch(37.9% 0.146 264.9)
- #553E00
#553E00
oklch(37.9% 0.078 84.8)
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 #1A398E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.041
- Twilight Blue #0A437A ΔE 0.046
- Sapphire #2138AB ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.064
- Marine Blue #01386A ΔE 0.065
- Blueberry #464196 ΔE 0.065
- Light Navy #155084 ΔE 0.068
- Royal #0C1793 ΔE 0.073
Use #1A398E 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.