#1837C4
Closest named color: Blue Blue (#2242C7). oklch(42.8% 0.219 266), rgb(24, 55, 196).
Aa
White text reads best on this color (8.81:1).
About this color
#1837C4 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.219 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.027 away. White text reads best on it, at 8.81:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.219) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.38:1 |
| White text | 8.81:1 |
Values
| HEX | #1837C4 |
| RGB | rgb(24, 55, 196) |
| HSL | hsl(229, 78%, 43%) |
| OKLCH | oklch(42.8% 0.219 266) |
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 #1837C4 | 8.81:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #1837C4 | 2.38:1 | Fails | Lc 15.0 | Not readable |
| #1837C4 text on white | 8.81:1 | AAA | Lc 89.0 | Fine for body text |
| #1837C4 text on black | 2.38:1 | Fails | Lc -13.2 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A4C0FF
oklch(81% 0.095 265.8)
-
Step 400
400
#749CFF
oklch(70.8% 0.152 266)
-
Step 500
500
#507FFF
oklch(63.1% 0.197 265.8)
-
Step 600
600
#305DFF
oklch(55.6% 0.244 266.1)
-
Step 700
700
#1D3FF3
oklch(49.1% 0.265 266)
-
Step 800
800 (this color)
#1837C4
oklch(42.8% 0.219 266)
-
Step 900
900
#17339A
oklch(37.7% 0.17 266)
-
Step 950
950
#0D1F5A
oklch(26.9% 0.109 266)
#1837C4 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) | #0053C8 | 0.060 |
| Deuteranopia (no green cones) | #0042C1 | 0.022 |
| Tritanopia (no blue cones) | #00607A | 0.167 |
| Achromatopsia (no color) | #4A4A4A | 0.219 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1837C4
#1837C4
oklch(42.8% 0.219 266)
- #644B00
#644B00
oklch(42.8% 0.087 86.6)
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 #1837C4, closest first.
No curated palette has a color within ΔE 0.04 of #1837C4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.027
- Sapphire #2138AB ΔE 0.041
- Majorelle Blue #3F37C9 ΔE 0.044
- True Blue #010FCC ΔE 0.057
- Ultramarine Blue #1805DB ΔE 0.058
- Medium Blue #0000CD ΔE 0.065
- Indigo Blue #3A18B1 ΔE 0.066
- Pure Blue #0203E2 ΔE 0.068
Use #1837C4 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.