#51A3FC
Closest named color: Cornflower Blue (#6495ED). oklch(70.5% 0.154 252.5), rgb(81, 163, 252).
Aa
Black text reads best on this color (7.99:1).
About this color
#51A3FC is a medium-light, vivid blue. In OKLCH its lightness is 70%, its chroma 0.154 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.040 away. Black text reads best on it, at 7.99:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.99:1 |
| White text | 2.62:1 |
Values
| HEX | #51A3FC |
| RGB | rgb(81, 163, 252) |
| HSL | hsl(211, 97%, 65%) |
| OKLCH | oklch(70.5% 0.154 252.5) |
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 #51A3FC | 2.62:1 | Fails | Lc -56.1 | Large or bold text, headings |
| Black text on #51A3FC | 7.99:1 | AAA | Lc 53.1 | Large or bold text, headings |
| #51A3FC text on white | 2.62:1 | Fails | Lc 50.9 | Large or bold text, headings |
| #51A3FC text on black | 7.99:1 | AAA | Lc -51.0 | Large or bold text, headings |
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 400.
-
Step 50
50
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DDECFD
oklch(93.7% 0.028 251.5)
-
Step 200
200
#C1DCFC
oklch(88.5% 0.053 252.8)
-
Step 300
300
#94C5FD
oklch(81% 0.095 252.3)
-
Step 400
400 (this color)
#51A3FC
oklch(70.5% 0.154 252.5)
-
Step 500
500
#008AF8
oklch(63.2% 0.191 252.4)
-
Step 600
600
#0074D2
oklch(55.7% 0.168 252.4)
-
Step 700
700
#0061B2
oklch(49.2% 0.149 252.5)
-
Step 800
800
#004F93
oklch(42.7% 0.13 252.6)
-
Step 900
900
#00427C
oklch(37.8% 0.114 252.4)
-
Step 950
950
#01274C
oklch(27.1% 0.08 252.1)
#51A3FC 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) | #7BA8FF | 0.044 |
| Deuteranopia (no green cones) | #6398FA | 0.030 |
| Tritanopia (no blue cones) | #00B8C4 | 0.119 |
| Achromatopsia (no color) | #A0A0A0 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51A3FC
#51A3FC
oklch(70.5% 0.154 252.5)
- #D88E00
#D88E00
oklch(70.5% 0.151 72.5)
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 #51A3FC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.040
- Chefchaouen Blue #4895EF ΔE 0.041
- Dodger Blue #1E90FF ΔE 0.064
- Dark Sky Blue #448EE4 ΔE 0.064
- Periwinkle Blue #8F99FB ΔE 0.067
- Soft Blue #6488EA ΔE 0.070
- Deep Sky Blue #00BFFF ΔE 0.075
- Perrywinkle #8F8CE7 ΔE 0.083
Use #51A3FC 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.