#1873E5
Closest named color: Cerulean Blue (#056EEE). oklch(57.1% 0.191 257.3), rgb(24, 115, 229).
Aa
Black text reads best on this color (4.62:1).
About this color
#1873E5 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.191 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.020 away. Black text reads best on it, at 4.62:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.191) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.62:1 |
| White text | 4.54:1 |
Values
| HEX | #1873E5 |
| RGB | rgb(24, 115, 229) |
| HSL | hsl(213, 81%, 50%) |
| OKLCH | oklch(57.1% 0.191 257.3) |
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 #1873E5 | 4.54:1 | AA | Lc -76.3 | Fine for body text |
| Black text on #1873E5 | 4.62:1 | AA | Lc 33.2 | Non-text elements, placeholder text |
| #1873E5 text on white | 4.54:1 | AA | Lc 70.9 | Content text, not long reading |
| #1873E5 text on black | 4.62:1 | AA | Lc -30.8 | Non-text elements, placeholder text |
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 600.
-
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
#9EC3F8
oklch(80.9% 0.085 257.3)
-
Step 400
400
#67A2F5
oklch(70.8% 0.137 257.1)
-
Step 500
500
#3A87F1
oklch(63% 0.176 257.3)
-
Step 600
600 (this color)
#1873E5
oklch(57.1% 0.191 257.3)
-
Step 700
700
#005BC2
oklch(49% 0.177 257.5)
-
Step 800
800
#074B9D
oklch(42.6% 0.147 257.3)
-
Step 900
900
#12407D
oklch(37.8% 0.115 257.2)
-
Step 950
950
#0C2649
oklch(27% 0.072 256.9)
#1873E5 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) | #287FE9 | 0.034 |
| Deuteranopia (no green cones) | #006EE3 | 0.016 |
| Tritanopia (no blue cones) | #008FA1 | 0.145 |
| Achromatopsia (no color) | #767676 | 0.191 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1873E5
#1873E5
oklch(57.1% 0.191 257.3)
- #9E6D00
#9E6D00
oklch(57.1% 0.119 77.6)
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 #1873E5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.020
- Royal Blue #4169E1 ΔE 0.032
- Clear Blue #247AFD ΔE 0.041
- Neon Blue #4361EE ΔE 0.050
- Bright Blue #0165FC ΔE 0.050
- Azul #1D5DEC ΔE 0.054
- Windows Blue #3778BF ΔE 0.064
- Water Blue #0E87CC ΔE 0.071
Use #1873E5 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.