#1B3FA0
Closest named color: Sapphire (#2138AB). oklch(40.8% 0.163 264.5), rgb(27, 63, 160).
Aa
White text reads best on this color (9.27:1).
About this color
#1B3FA0 is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.163 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.024 away. White text reads best on it, at 9.27:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.26:1 |
| White text | 9.27:1 |
Values
| HEX | #1B3FA0 |
| RGB | rgb(27, 63, 160) |
| HSL | hsl(224, 71%, 37%) |
| OKLCH | oklch(40.8% 0.163 264.5) |
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 #1B3FA0 | 9.27:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #1B3FA0 | 2.26:1 | Fails | Lc 13.2 | Not readable |
| #1B3FA0 text on white | 9.27:1 | AAA | Lc 90.7 | Preferred for body text |
| #1B3FA0 text on black | 2.26:1 | Fails | Lc -11.6 | 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 800.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C8D9FD
oklch(88.4% 0.053 265.3)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#709DFF
oklch(70.7% 0.152 264.2)
-
Step 500
500
#4C80FD
oklch(63% 0.195 264.5)
-
Step 600
600
#3265ED
oklch(55.6% 0.213 264.7)
-
Step 700
700
#2653CE
oklch(49.1% 0.197 264.6)
-
Step 800
800 (this color)
#1B3FA0
oklch(40.8% 0.163 264.5)
-
Step 900
900
#1E3B84
oklch(37.6% 0.128 264.6)
-
Step 950
950
#12234D
oklch(26.9% 0.081 264.9)
#1B3FA0 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) | #004EA3 | 0.038 |
| Deuteranopia (no green cones) | #00419E | 0.014 |
| Tritanopia (no blue cones) | #005869 | 0.126 |
| Achromatopsia (no color) | #474747 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3FA0
#1B3FA0
oklch(40.8% 0.163 264.5)
- #5F4500
#5F4500
oklch(40.8% 0.084 84)
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 #1B3FA0, closest first.
No curated palette has a color within ΔE 0.04 of #1B3FA0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.024
- Cobalt #1E488F ΔE 0.038
- Blueberry #464196 ΔE 0.056
- Blue Blue #2242C7 ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.066
- Twilight Blue #0A437A ΔE 0.066
- Dusk Blue #26538D ΔE 0.067
- Light Navy #155084 ΔE 0.069
Use #1B3FA0 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.