#51A4E8
Closest named color: Cornflower Blue (#6495ED). oklch(69.6% 0.129 245.9), rgb(81, 164, 232).
Aa
Black text reads best on this color (7.82:1).
About this color
#51A4E8 is a medium-light, moderately saturated blue. In OKLCH its lightness is 70%, its chroma 0.129 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.044 away. Black text reads best on it, at 7.82:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.82:1 |
| White text | 2.68:1 |
Values
| HEX | #51A4E8 |
| RGB | rgb(81, 164, 232) |
| HSL | hsl(207, 77%, 61%) |
| OKLCH | oklch(69.6% 0.129 245.9) |
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 #51A4E8 | 2.68:1 | Fails | Lc -57.1 | Large or bold text, headings |
| Black text on #51A4E8 | 7.82:1 | AAA | Lc 52.2 | Large or bold text, headings |
| #51A4E8 text on white | 2.68:1 | Fails | Lc 51.9 | Large or bold text, headings |
| #51A4E8 text on black | 7.82:1 | AAA | Lc -50.0 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DEECF9
oklch(93.6% 0.023 246)
-
Step 200
200
#C2DDF6
oklch(88.6% 0.045 246.3)
-
Step 300
300
#95C6F2
oklch(80.8% 0.081 246.1)
-
Step 400
400 (this color)
#51A4E8
oklch(69.6% 0.129 245.9)
-
Step 500
500
#008FE4
oklch(63% 0.162 246)
-
Step 600
600
#0078C1
oklch(55.5% 0.143 246.2)
-
Step 700
700
#0065A3
oklch(49.1% 0.126 245.9)
-
Step 800
800
#005387
oklch(42.8% 0.11 245.8)
-
Step 900
900
#004571
oklch(37.8% 0.096 245.5)
-
Step 950
950
#012845
oklch(26.9% 0.068 246.3)
#51A4E8 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) | #86A6EB | 0.055 |
| Deuteranopia (no green cones) | #7197E7 | 0.043 |
| Tritanopia (no blue cones) | #00B4BC | 0.096 |
| Achromatopsia (no color) | #9E9E9E | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51A4E8
#51A4E8
oklch(69.6% 0.129 245.9)
- #D38B3A
#D38B3A
oklch(69.6% 0.129 65.6)
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 #51A4E8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.044
- Chefchaouen Blue #4895EF ΔE 0.046
- Dark Sky Blue #448EE4 ΔE 0.062
- Deep Sky Blue #00BFFF ΔE 0.073
- Soft Blue #6488EA ΔE 0.075
- Dodger Blue #1E90FF ΔE 0.078
- Periwinkle Blue #8F99FB ΔE 0.078
- Greyblue #77A1B5 ΔE 0.079
Use #51A4E8 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.