#1B45A5
Closest named color: Sapphire (#2138AB). oklch(42.4% 0.162 263.3), rgb(27, 69, 165).
Aa
White text reads best on this color (8.60:1).
About this color
#1B45A5 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.162 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.031 away. White text reads best on it, at 8.60:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.162) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.44:1 |
| White text | 8.60:1 |
Values
| HEX | #1B45A5 |
| RGB | rgb(27, 69, 165) |
| HSL | hsl(222, 72%, 38%) |
| OKLCH | oklch(42.4% 0.162 263.3) |
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 #1B45A5 | 8.60:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #1B45A5 | 2.44:1 | Fails | Lc 15.0 | Dividers and decoration only |
| #1B45A5 text on white | 8.60:1 | AAA | Lc 88.9 | Fine for body text |
| #1B45A5 text on black | 2.44:1 | Fails | Lc -13.3 | 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
#E0EAFD
oklch(93.5% 0.028 263.4)
-
Step 200
200
#C7DAFD
oklch(88.5% 0.053 262.7)
-
Step 300
300
#A1C1FF
oklch(81% 0.095 263.3)
-
Step 400
400
#6E9DFE
oklch(70.6% 0.151 263.5)
-
Step 500
500
#4881FD
oklch(63.1% 0.195 263.3)
-
Step 600
600
#2C67EC
oklch(55.7% 0.21 263.2)
-
Step 700
700
#2054CD
oklch(49% 0.196 263.3)
-
Step 800
800 (this color)
#1B45A5
oklch(42.4% 0.162 263.3)
-
Step 900
900
#1C3C83
oklch(37.7% 0.126 263.3)
-
Step 950
950
#11244D
oklch(27.1% 0.08 263.3)
#1B45A5 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) | #0052A8 | 0.033 |
| Deuteranopia (no green cones) | #0046A3 | 0.013 |
| Tritanopia (no blue cones) | #005D6E | 0.125 |
| Achromatopsia (no color) | #4C4C4C | 0.162 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B45A5
#1B45A5
oklch(42.4% 0.162 263.3)
- #654900
#654900
oklch(42.4% 0.087 83.3)
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 #1B45A5, closest first.
No curated palette has a color within ΔE 0.04 of #1B45A5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.031
- Cobalt #1E488F ΔE 0.038
- Blueberry #464196 ΔE 0.055
- Blue Blue #2242C7 ΔE 0.055
- Dusk Blue #26538D ΔE 0.059
- Light Navy #155084 ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.068
- Majorelle Blue #3F37C9 ΔE 0.072
Use #1B45A5 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.