#1A3971
Closest named color: Marine Blue (#01386A). oklch(35.5% 0.104 261.1), rgb(26, 57, 113).
Aa
White text reads best on this color (11.24:1).
About this color
#1A3971 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.104 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.022 away. White text reads best on it, at 11.24:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.86:1 |
| White text | 11.24:1 |
Values
| HEX | #1A3971 |
| RGB | rgb(26, 57, 113) |
| HSL | hsl(219, 63%, 27%) |
| OKLCH | oklch(35.5% 0.104 261.1) |
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 #1A3971 | 11.24:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #1A3971 | 1.86:1 | Fails | Lc 8.3 | Not readable |
| #1A3971 text on white | 11.24:1 | AAA | Lc 95.6 | Preferred for body text |
| #1A3971 text on black | 1.86:1 | Fails | Lc 0.0 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A5C2F4
oklch(81% 0.078 261.2)
-
Step 400
400
#74A0EE
oklch(70.7% 0.125 261.3)
-
Step 500
500
#4F86E8
oklch(63% 0.159 261)
-
Step 600
600
#336ED7
oklch(55.7% 0.173 260.9)
-
Step 700
700
#265BBA
oklch(49.1% 0.161 261)
-
Step 800
800
#214B96
oklch(42.7% 0.132 260.9)
-
Step 900
900 (this color)
#1A3971
oklch(35.5% 0.104 261.1)
-
Step 950
950
#132546
oklch(26.9% 0.066 261.5)
#1A3971 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) | #1B3F73 | 0.018 |
| Deuteranopia (no green cones) | #043770 | 0.017 |
| Tritanopia (no blue cones) | #00464F | 0.082 |
| Achromatopsia (no color) | #3B3B3B | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1A3971
#1A3971
oklch(35.5% 0.104 261.1)
- #4F3700
#4F3700
oklch(35.5% 0.073 81.3)
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 #1A3971, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.022
- Twilight Blue #0A437A ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.045
- Marine #042E60 ΔE 0.049
- Cobalt #1E488F ΔE 0.064
- Dark Grey Blue #29465B ΔE 0.065
- Dark Blue Grey #1F3B4D ΔE 0.065
- Midnight Green #073B4C ΔE 0.070
Use #1A3971 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.