#1F3686
Closest named color: Twilight Blue (#0A437A). oklch(36.8% 0.137 267.1), rgb(31, 54, 134).
Aa
White text reads best on this color (10.87:1).
About this color
#1F3686 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.137 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.044 away. White text reads best on it, at 10.87:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.93:1 |
| White text | 10.87:1 |
Values
| HEX | #1F3686 |
| RGB | rgb(31, 54, 134) |
| HSL | hsl(227, 62%, 32%) |
| OKLCH | oklch(36.8% 0.137 267.1) |
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 #1F3686 | 10.87:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #1F3686 | 1.93:1 | Fails | Lc 9.2 | Not readable |
| #1F3686 text on white | 10.87:1 | AAA | Lc 94.7 | Preferred for body text |
| #1F3686 text on black | 1.93:1 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A5BFFF
oklch(80.9% 0.095 267.2)
-
Step 400
400
#769BFF
oklch(70.7% 0.152 267.2)
-
Step 500
500
#547EFF
oklch(63.1% 0.197 267)
-
Step 600
600
#3960F6
oklch(55.6% 0.228 267.1)
-
Step 700
700
#2C4ED6
oklch(49.1% 0.211 266.9)
-
Step 800
800
#2541AD
oklch(42.7% 0.175 267.1)
-
Step 900
900 (this color)
#1F3686
oklch(36.8% 0.137 267.1)
-
Step 950
950
#132250
oklch(26.9% 0.087 266.8)
#1F3686 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) | #004289 | 0.034 |
| Deuteranopia (no green cones) | #003884 | 0.021 |
| Tritanopia (no blue cones) | #004A58 | 0.109 |
| Achromatopsia (no color) | #3D3D3D | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3686
#1F3686
oklch(36.8% 0.137 267.1)
- #503C00
#503C00
oklch(36.8% 0.075 87.4)
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 #1F3686, closest first.
No curated palette has a color within ΔE 0.04 of #1F3686.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.044
- Cobalt #1E488F ΔE 0.050
- Marine Blue #01386A ΔE 0.054
- Sapphire #2138AB ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.065
- Blueberry #464196 ΔE 0.070
- Royal #0C1793 ΔE 0.071
- Light Navy #155084 ΔE 0.073
Use #1F3686 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.