#1F3876
Closest named color: Marine Blue (#01386A). oklch(35.9% 0.111 264.8), rgb(31, 56, 118).
Aa
White text reads best on this color (11.13:1).
About this color
#1F3876 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.111 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.031 away. White text reads best on it, at 11.13:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.88:1 |
| White text | 11.13:1 |
Values
| HEX | #1F3876 |
| RGB | rgb(31, 56, 118) |
| HSL | hsl(223, 58%, 29%) |
| OKLCH | oklch(35.9% 0.111 264.8) |
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 #1F3876 | 11.13:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #1F3876 | 1.88:1 | Fails | Lc 8.5 | Not readable |
| #1F3876 text on white | 11.13:1 | AAA | Lc 95.4 | Preferred for body text |
| #1F3876 text on black | 1.88:1 | 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
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CAD9F9
oklch(88.4% 0.047 265.5)
-
Step 300
300
#A6C0F7
oklch(80.8% 0.083 264.9)
-
Step 400
400
#779EF3
oklch(70.7% 0.132 264.6)
-
Step 500
500
#5583EF
oklch(63.1% 0.17 264.7)
-
Step 600
600
#3C69DE
oklch(55.5% 0.186 265)
-
Step 700
700
#2F57C0
oklch(49.1% 0.171 264.9)
-
Step 800
800
#27489C
oklch(42.8% 0.143 264.8)
-
Step 900
900 (this color)
#1F3876
oklch(35.9% 0.111 264.8)
-
Step 950
950
#152448
oklch(26.9% 0.07 265)
#1F3876 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) | #134078 | 0.023 |
| Deuteranopia (no green cones) | #003875 | 0.022 |
| Tritanopia (no blue cones) | #004751 | 0.090 |
| Achromatopsia (no color) | #3B3B3B | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3876
#1F3876
oklch(35.9% 0.111 264.8)
- #4E3900
#4E3900
oklch(35.8% 0.073 85.4)
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 #1F3876, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.031
- Twilight Blue #0A437A ΔE 0.032
- Prussian Blue #1D3557 ΔE 0.054
- Marine #042E60 ΔE 0.055
- Cobalt #1E488F ΔE 0.059
- Light Navy #155084 ΔE 0.070
- Dark Grey Blue #29465B ΔE 0.071
- Dark Slate Blue #483D8B ΔE 0.072
Use #1F3876 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.