#1F3F85
Closest named color: Twilight Blue (#0A437A). oklch(38.6% 0.124 263.3), rgb(31, 63, 133).
Aa
White text reads best on this color (9.96:1).
About this color
#1F3F85 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.124 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.027 away. White text reads best on it, at 9.96:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.10:1 |
| White text | 9.96:1 |
Values
| HEX | #1F3F85 |
| RGB | rgb(31, 63, 133) |
| HSL | hsl(221, 62%, 32%) |
| OKLCH | oklch(38.6% 0.124 263.3) |
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 #1F3F85 | 9.96:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #1F3F85 | 2.10:1 | Fails | Lc 11.2 | Not readable |
| #1F3F85 text on white | 9.96:1 | AAA | Lc 92.7 | Preferred for body text |
| #1F3F85 text on black | 2.10:1 | Fails | Lc -9.7 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C8DAFC
oklch(88.6% 0.051 263.2)
-
Step 300
300
#A1C1FD
oklch(80.9% 0.092 262.7)
-
Step 400
400
#6F9EFD
oklch(70.8% 0.149 263.2)
-
Step 500
500
#4A82FA
oklch(63.1% 0.189 263.2)
-
Step 600
600
#2E67E9
oklch(55.5% 0.206 263.3)
-
Step 700
700
#2255CB
oklch(49.1% 0.191 263.4)
-
Step 800
800
#1D46A4
oklch(42.6% 0.159 263.4)
-
Step 900
900 (this color)
#1F3F85
oklch(38.6% 0.124 263.3)
-
Step 950
950
#11244C
oklch(27% 0.078 263.1)
#1F3F85 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) | #134888 | 0.025 |
| Deuteranopia (no green cones) | #003E84 | 0.020 |
| Tritanopia (no blue cones) | #00505B | 0.099 |
| Achromatopsia (no color) | #434343 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3F85
#1F3F85
oklch(38.6% 0.124 263.3)
- #583F00
#583F00
oklch(38.5% 0.079 83.1)
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 #1F3F85, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.027
- Cobalt #1E488F ΔE 0.029
- Light Navy #155084 ΔE 0.049
- Marine Blue #01386A ΔE 0.056
- Dark Slate Blue #483D8B ΔE 0.056
- Dusk Blue #26538D ΔE 0.059
- Blueberry #464196 ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.062
Use #1F3F85 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.