#1851A5
Closest named color: Dusk Blue (#26538D). oklch(44.9% 0.148 258.8), rgb(24, 81, 165).
Aa
White text reads best on this color (7.61:1).
About this color
#1851A5 is a dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.148 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.041 away. White text reads best on it, at 7.61:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.75:1 |
| White text | 7.61:1 |
Values
| HEX | #1851A5 |
| RGB | rgb(24, 81, 165) |
| HSL | hsl(216, 75%, 37%) |
| OKLCH | oklch(44.9% 0.148 258.8) |
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 #1851A5 | 7.61:1 | AAA | Lc -90.7 | Preferred for body text |
| Black text on #1851A5 | 2.75:1 | Fails | Lc 18.1 | Dividers and decoration only |
| #1851A5 text on white | 7.61:1 | AAA | Lc 85.9 | Fine for body text |
| #1851A5 text on black | 2.75:1 | Fails | Lc -16.1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBF9
oklch(88.5% 0.047 257.3)
-
Step 300
300
#9FC2F9
oklch(80.8% 0.087 259.3)
-
Step 400
400
#6AA1F6
oklch(70.8% 0.138 258.8)
-
Step 500
500
#4086F2
oklch(63% 0.177 259)
-
Step 600
600
#1C6DE1
oklch(55.6% 0.192 258.8)
-
Step 700
700
#0E5AC3
oklch(49.1% 0.178 258.9)
-
Step 800
800 (this color)
#1851A5
oklch(44.9% 0.148 258.8)
-
Step 900
900
#163F7D
oklch(37.7% 0.115 258.9)
-
Step 950
950
#0E2549
oklch(26.8% 0.073 259.1)
#1851A5 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) | #1B5AA8 | 0.025 |
| Deuteranopia (no green cones) | #004EA3 | 0.015 |
| Tritanopia (no blue cones) | #006573 | 0.112 |
| Achromatopsia (no color) | #545454 | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1851A5
#1851A5
oklch(44.9% 0.148 258.8)
- #714E00
#714E00
oklch(45.1% 0.094 78.9)
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 #1851A5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.041
- Cobalt #1E488F ΔE 0.041
- Light Navy #155084 ΔE 0.054
- Denim Blue #3B5B92 ΔE 0.056
- Light Navy Blue #2E5A88 ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.061
- Blueberry #464196 ΔE 0.061
- Sapphire #2138AB ΔE 0.062
Use #1851A5 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.