#1B51C3
Closest named color: Blue Blue (#2242C7). oklch(47.5% 0.187 262.6), rgb(27, 81, 195).
Aa
White text reads best on this color (6.97:1).
About this color
#1B51C3 is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.187 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.034 away. White text reads best on it, at 6.97:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.187) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 3.01:1 |
| White text | 6.97:1 |
Values
| HEX | #1B51C3 |
| RGB | rgb(27, 81, 195) |
| HSL | hsl(221, 76%, 44%) |
| OKLCH | oklch(47.5% 0.187 262.6) |
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 #1B51C3 | 6.97:1 | AA | Lc -88.4 | Fine for body text |
| Black text on #1B51C3 | 3.01:1 | AA large text | Lc 20.6 | Dividers and decoration only |
| #1B51C3 text on white | 6.97:1 | AA | Lc 83.4 | Fine for body text |
| #1B51C3 text on black | 3.01:1 | AA large text | Lc -18.5 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C8DAFB
oklch(88.5% 0.05 262.6)
-
Step 300
300
#A1C1FC
oklch(80.9% 0.091 262.4)
-
Step 400
400
#6F9EFA
oklch(70.6% 0.145 262.7)
-
Step 500
500
#4983F8
oklch(63.2% 0.185 262.5)
-
Step 600
600
#2C69E7
oklch(55.7% 0.202 262.4)
-
Step 700
700 (this color)
#1B51C3
oklch(47.5% 0.187 262.6)
-
Step 800
800
#1C47A2
oklch(42.6% 0.155 262.7)
-
Step 900
900
#1C3D81
oklch(37.7% 0.121 262.6)
-
Step 950
950
#11244B
oklch(26.9% 0.077 262.8)
#1B51C3 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) | #0061C7 | 0.039 |
| Deuteranopia (no green cones) | #0052C1 | 0.011 |
| Tritanopia (no blue cones) | #006E82 | 0.143 |
| Achromatopsia (no color) | #595959 | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B51C3
#1B51C3
oklch(47.5% 0.187 262.6)
- #775600
#775600
oklch(47.5% 0.098 82.7)
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 #1B51C3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.034
- Majorelle Blue #3F37C9 ΔE 0.059
- Warm Blue #4B57DB ΔE 0.065
- Sapphire #2138AB ΔE 0.070
- Azul #1D5DEC ΔE 0.070
- Blue With A Hint Of Purple #533CC6 ΔE 0.071
- Mid Blue #276AB3 ΔE 0.075
- Blurple #5539CC ΔE 0.077
Use #1B51C3 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.