#1B52AB
Closest named color: Dusk Blue (#26538D). oklch(45.7% 0.154 259.9), rgb(27, 82, 171).
Aa
White text reads best on this color (7.39:1).
About this color
#1B52AB is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.154 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.050 away. White text reads best on it, at 7.39:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.84:1 |
| White text | 7.39:1 |
Values
| HEX | #1B52AB |
| RGB | rgb(27, 82, 171) |
| HSL | hsl(217, 73%, 39%) |
| OKLCH | oklch(45.7% 0.154 259.9) |
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 #1B52AB | 7.39:1 | AAA | Lc -90.0 | Preferred for body text |
| Black text on #1B52AB | 2.84:1 | Fails | Lc 18.9 | Dividers and decoration only |
| #1B52AB text on white | 7.39:1 | AAA | Lc 85.1 | Fine for body text |
| #1B52AB text on black | 2.84:1 | Fails | Lc -16.9 | Dividers and decoration only |
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
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DAFB
oklch(88.4% 0.051 260.4)
-
Step 300
300
#9FC2FB
oklch(80.9% 0.09 260)
-
Step 400
400
#69A0F9
oklch(70.7% 0.144 259.6)
-
Step 500
500
#4085F6
oklch(63.1% 0.183 259.8)
-
Step 600
600
#1E6BE5
oklch(55.6% 0.2 259.9)
-
Step 700
700
#1058C7
oklch(49% 0.186 260)
-
Step 800
800 (this color)
#1B52AB
oklch(45.7% 0.154 259.9)
-
Step 900
900
#163E80
oklch(37.7% 0.12 260)
-
Step 950
950
#0E254B
oklch(27% 0.076 259.9)
#1B52AB 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) | #145CAE | 0.027 |
| Deuteranopia (no green cones) | #004FA9 | 0.016 |
| Tritanopia (no blue cones) | #006876 | 0.119 |
| Achromatopsia (no color) | #565656 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B52AB
#1B52AB
oklch(45.7% 0.154 259.9)
- #735000
#735000
oklch(45.7% 0.095 79.5)
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 #1B52AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.050
- Cobalt #1E488F ΔE 0.051
- Blue Blue #2242C7 ΔE 0.058
- Denim Blue #3B5B92 ΔE 0.059
- Sapphire #2138AB ΔE 0.063
- Light Navy #155084 ΔE 0.064
- Blueberry #464196 ΔE 0.064
- Light Navy Blue #2E5A88 ΔE 0.066
Use #1B52AB 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.