#1A3CB8
Closest named color: Sapphire (#2138AB). oklch(42.5% 0.198 265.7), rgb(26, 60, 184).
Aa
White text reads best on this color (8.81:1).
About this color
#1A3CB8 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.198 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.023 away. White text reads best on it, at 8.81:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.198) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.38:1 |
| White text | 8.81:1 |
Values
| HEX | #1A3CB8 |
| RGB | rgb(26, 60, 184) |
| HSL | hsl(227, 75%, 41%) |
| OKLCH | oklch(42.5% 0.198 265.7) |
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 #1A3CB8 | 8.81:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #1A3CB8 | 2.38:1 | Fails | Lc 14.7 | Not readable |
| #1A3CB8 text on white | 8.81:1 | AAA | Lc 89.2 | Fine for body text |
| #1A3CB8 text on black | 2.38:1 | Fails | Lc -13.0 | 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 800.
-
Step 50
50
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#739CFF
oklch(70.7% 0.152 265.7)
-
Step 500
500
#4F7FFF
oklch(63.1% 0.197 265.6)
-
Step 600
600
#2E5EFF
oklch(55.7% 0.244 265.6)
-
Step 700
700
#2048E5
oklch(49.1% 0.239 265.7)
-
Step 800
800 (this color)
#1A3CB8
oklch(42.5% 0.198 265.7)
-
Step 900
900
#1A3692
oklch(37.6% 0.155 265.9)
-
Step 950
950
#0F2155
oklch(26.9% 0.098 265.6)
#1A3CB8 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) | #0052BC | 0.050 |
| Deuteranopia (no green cones) | #0043B6 | 0.017 |
| Tritanopia (no blue cones) | #005E75 | 0.151 |
| Achromatopsia (no color) | #4A4A4A | 0.199 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1A3CB8
#1A3CB8
oklch(42.5% 0.198 265.7)
- #644A00
#644A00
oklch(42.5% 0.087 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 #1A3CB8, closest first.
No curated palette has a color within ΔE 0.04 of #1A3CB8.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.023
- Blue Blue #2242C7 ΔE 0.030
- Majorelle Blue #3F37C9 ΔE 0.049
- Indigo Blue #3A18B1 ΔE 0.065
- True Blue #010FCC ΔE 0.071
- Cobalt #1E488F ΔE 0.074
- Blue With A Hint Of Purple #533CC6 ΔE 0.076
- Ultramarine Blue #1805DB ΔE 0.078
Use #1A3CB8 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.