#1A3B78
Closest named color: Twilight Blue (#0A437A). oklch(36.5% 0.111 261.4), rgb(26, 59, 120).
Aa
White text reads best on this color (10.82:1).
About this color
#1A3B78 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.111 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.023 away. White text reads best on it, at 10.82:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.82:1 |
Values
| HEX | #1A3B78 |
| RGB | rgb(26, 59, 120) |
| HSL | hsl(219, 64%, 29%) |
| OKLCH | oklch(36.5% 0.111 261.4) |
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 #1A3B78 | 10.82:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #1A3B78 | 1.94:1 | Fails | Lc 9.2 | Not readable |
| #1A3B78 text on white | 10.82:1 | AAA | Lc 94.7 | Preferred for body text |
| #1A3B78 text on black | 1.94:1 | Fails | Lc -7.9 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAF9
oklch(88.5% 0.047 261.4)
-
Step 300
300
#A3C2F7
oklch(81% 0.083 261)
-
Step 400
400
#71A0F4
oklch(70.8% 0.134 261.4)
-
Step 500
500
#4B85EF
oklch(63.1% 0.171 261.3)
-
Step 600
600
#2E6CDE
oklch(55.6% 0.186 261.3)
-
Step 700
700
#2159C1
oklch(49.1% 0.174 261.4)
-
Step 800
800
#1D4A9C
oklch(42.8% 0.143 261.2)
-
Step 900
900 (this color)
#1A3B78
oklch(36.5% 0.111 261.4)
-
Step 950
950
#122548
oklch(27% 0.07 261.5)
#1A3B78 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) | #18427A | 0.020 |
| Deuteranopia (no green cones) | #003977 | 0.019 |
| Tritanopia (no blue cones) | #004A53 | 0.089 |
| Achromatopsia (no color) | #3D3D3D | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1A3B78
#1A3B78
oklch(36.5% 0.111 261.4)
- #523900
#523900
oklch(36.4% 0.075 81)
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 #1A3B78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.023
- Marine Blue #01386A ΔE 0.032
- Cobalt #1E488F ΔE 0.052
- Prussian Blue #1D3557 ΔE 0.058
- Marine #042E60 ΔE 0.060
- Light Navy #155084 ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.072
Use #1A3B78 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.