#51A4DD
Closest named color: Cornflower Blue (#6495ED). oklch(69.1% 0.117 241.3), rgb(81, 164, 221).
Aa
Black text reads best on this color (7.70:1).
About this color
#51A4DD is a medium-light, moderately saturated blue. In OKLCH its lightness is 69%, its chroma 0.117 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.054 away. Black text reads best on it, at 7.70:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.70:1 |
| White text | 2.72:1 |
Values
| HEX | #51A4DD |
| RGB | rgb(81, 164, 221) |
| HSL | hsl(204, 67%, 59%) |
| OKLCH | oklch(69.1% 0.117 241.3) |
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 #51A4DD | 2.72:1 | Fails | Lc -57.8 | Large or bold text, headings |
| Black text on #51A4DD | 7.70:1 | AAA | Lc 51.5 | Large or bold text, headings |
| #51A4DD text on white | 2.72:1 | Fails | Lc 52.5 | Large or bold text, headings |
| #51A4DD text on black | 7.70:1 | AAA | Lc -49.3 | 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
#DEECF7
oklch(93.6% 0.021 241.4)
-
Step 200
200
#C2DDF2
oklch(88.4% 0.041 241.4)
-
Step 300
300
#97C7EC
oklch(80.9% 0.073 241.9)
-
Step 400
400 (this color)
#51A4DD
oklch(69.1% 0.117 241.3)
-
Step 500
500
#0092DA
oklch(63.1% 0.148 241.4)
-
Step 600
600
#007BB8
oklch(55.7% 0.13 241.1)
-
Step 700
700
#00679B
oklch(49.1% 0.115 241)
-
Step 800
800
#005480
oklch(42.6% 0.1 241.3)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#012941
oklch(26.9% 0.062 241.1)
#51A4DD 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) | #8AA4E0 | 0.059 |
| Deuteranopia (no green cones) | #7796DC | 0.049 |
| Tritanopia (no blue cones) | #00B2B8 | 0.084 |
| Achromatopsia (no color) | #9D9D9D | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51A4DD
#51A4DD
oklch(69.1% 0.117 241.3)
- #CF8A4A
#CF8A4A
oklch(69.1% 0.116 61.7)
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 #51A4DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.054
- Chefchaouen Blue #4895EF ΔE 0.055
- Greyblue #77A1B5 ΔE 0.065
- Dark Sky Blue #448EE4 ΔE 0.067
- Turquoise Blue #06B1C4 ΔE 0.067
- Faded Blue #658CBB ΔE 0.072
- Deep Sky Blue #00BFFF ΔE 0.078
- Bluegrey #85A3B2 ΔE 0.078
Use #51A4DD 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.