#1871D9
Closest named color: Cerulean Blue (#056EEE). oklch(55.8% 0.178 256.2), rgb(24, 113, 217).
Aa
White text reads best on this color (4.76:1).
About this color
#1871D9 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.178 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.034 away. White text reads best on it, at 4.76:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.178) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.40:1 |
| White text | 4.76:1 |
Values
| HEX | #1871D9 |
| RGB | rgb(24, 113, 217) |
| HSL | hsl(212, 80%, 47%) |
| OKLCH | oklch(55.8% 0.178 256.2) |
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 #1871D9 | 4.76:1 | AA | Lc -77.9 | Fine for body text |
| Black text on #1871D9 | 4.40:1 | AA large text | Lc 31.6 | Non-text elements, placeholder text |
| #1871D9 text on white | 4.76:1 | AA | Lc 72.5 | Content text, not long reading |
| #1871D9 text on black | 4.40:1 | AA large text | Lc -29.2 | 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 600.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9FC3F4
oklch(80.8% 0.08 256.2)
-
Step 400
400
#69A2EF
oklch(70.6% 0.129 256.3)
-
Step 500
500
#3E89EA
oklch(63.1% 0.164 256.2)
-
Step 600
600 (this color)
#1871D9
oklch(55.8% 0.178 256.2)
-
Step 700
700
#055DBC
oklch(49.1% 0.167 256.3)
-
Step 800
800
#0C4D98
oklch(42.8% 0.137 256.1)
-
Step 900
900
#144179
oklch(37.8% 0.107 256)
-
Step 950
950
#0E2647
oklch(27% 0.068 257.1)
#1871D9 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) | #337BDD | 0.033 |
| Deuteranopia (no green cones) | #006BD7 | 0.019 |
| Tritanopia (no blue cones) | #008A9A | 0.134 |
| Achromatopsia (no color) | #737373 | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1871D9
#1871D9
oklch(55.8% 0.178 256.2)
- #9A6900
#9A6900
oklch(55.8% 0.117 76.7)
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 #1871D9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.034
- Royal Blue #4169E1 ΔE 0.034
- Windows Blue #3778BF ΔE 0.051
- Neon Blue #4361EE ΔE 0.057
- Azul #1D5DEC ΔE 0.058
- Clear Blue #247AFD ΔE 0.059
- Mid Blue #276AB3 ΔE 0.059
- Bright Blue #0165FC ΔE 0.062
Use #1871D9 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.