#1A3978
Closest named color: Twilight Blue (#0A437A). oklch(36% 0.114 262.5), rgb(26, 57, 120).
Aa
White text reads best on this color (11.05:1).
About this color
#1A3978 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.114 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.029 away. White text reads best on it, at 11.05:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.90:1 |
| White text | 11.05:1 |
Values
| HEX | #1A3978 |
| RGB | rgb(26, 57, 120) |
| HSL | hsl(220, 64%, 29%) |
| OKLCH | oklch(36% 0.114 262.5) |
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 #1A3978 | 11.05:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #1A3978 | 1.90:1 | Fails | Lc 8.7 | Not readable |
| #1A3978 text on white | 11.05:1 | AAA | Lc 95.2 | Preferred for body text |
| #1A3978 text on black | 1.90:1 | Fails | Lc -7.5 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C9DAF9
oklch(88.5% 0.047 262.5)
-
Step 300
300
#A3C1F9
oklch(80.9% 0.086 262.7)
-
Step 400
400
#729FF6
oklch(70.8% 0.137 262.6)
-
Step 500
500
#4D84F2
oklch(63.1% 0.175 262.5)
-
Step 600
600
#316AE0
oklch(55.5% 0.19 262.5)
-
Step 700
700
#2458C3
oklch(49.1% 0.177 262.4)
-
Step 800
800
#1F499E
oklch(42.8% 0.146 262.3)
-
Step 900
900 (this color)
#1A3978
oklch(36% 0.114 262.5)
-
Step 950
950
#122549
oklch(27% 0.071 261.9)
#1A3978 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) | #12407A | 0.020 |
| Deuteranopia (no green cones) | #003877 | 0.018 |
| Tritanopia (no blue cones) | #004852 | 0.090 |
| Achromatopsia (no color) | #3C3C3C | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1A3978
#1A3978
oklch(36% 0.114 262.5)
- #503900
#503900
oklch(36.1% 0.074 83.2)
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 #1A3978, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.029
- Marine Blue #01386A ΔE 0.031
- Cobalt #1E488F ΔE 0.056
- Marine #042E60 ΔE 0.056
- Prussian Blue #1D3557 ΔE 0.057
- Light Navy #155084 ΔE 0.068
- Dark Grey Blue #29465B ΔE 0.073
- Dark Slate Blue #483D8B ΔE 0.074
Use #1A3978 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.