#1E51BC
Closest named color: Blue Blue (#2242C7). oklch(46.9% 0.177 262.5), rgb(30, 81, 188).
Aa
White text reads best on this color (7.09:1).
About this color
#1E51BC is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.177 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.038 away. White text reads best on it, at 7.09:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.177) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.95:1 |
| White text | 7.09:1 |
Values
| HEX | #1E51BC |
| RGB | rgb(30, 81, 188) |
| HSL | hsl(221, 72%, 43%) |
| OKLCH | oklch(46.9% 0.177 262.5) |
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 #1E51BC | 7.09:1 | AAA | Lc -88.9 | Fine for body text |
| Black text on #1E51BC | 2.95:1 | Fails | Lc 20.1 | Dividers and decoration only |
| #1E51BC text on white | 7.09:1 | AAA | Lc 84.0 | Fine for body text |
| #1E51BC text on black | 2.95:1 | Fails | Lc -18.0 | 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 700.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAFA
oklch(88.5% 0.048 262)
-
Step 300
300
#A3C1F9
oklch(80.9% 0.086 262.7)
-
Step 400
400
#729FF6
oklch(70.8% 0.137 262.6)
-
Step 500
500
#4D84F2
oklch(63.1% 0.175 262.5)
-
Step 600
600
#316AE1
oklch(55.6% 0.191 262.6)
-
Step 700
700 (this color)
#1E51BC
oklch(46.9% 0.177 262.5)
-
Step 800
800
#1F489E
oklch(42.6% 0.148 262.7)
-
Step 900
900
#1E3E7D
oklch(37.7% 0.114 262.2)
-
Step 950
950
#122549
oklch(27% 0.071 261.9)
#1E51BC 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) | #0060C0 | 0.038 |
| Deuteranopia (no green cones) | #0051BA | 0.013 |
| Tritanopia (no blue cones) | #006C7E | 0.137 |
| Achromatopsia (no color) | #585858 | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1E51BC
#1E51BC
oklch(46.9% 0.177 262.5)
- #755400
#755400
oklch(46.9% 0.097 82.2)
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 #1E51BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.038
- Majorelle Blue #3F37C9 ΔE 0.062
- Sapphire #2138AB ΔE 0.065
- Warm Blue #4B57DB ΔE 0.071
- Mid Blue #276AB3 ΔE 0.072
- Blue With A Hint Of Purple #533CC6 ΔE 0.072
- Cobalt #1E488F ΔE 0.075
- Dusk Blue #26538D ΔE 0.077
Use #1E51BC 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.