#51A2FE
Closest named color: Cornflower Blue (#6495ED). oklch(70.3% 0.157 253.4), rgb(81, 162, 254).
Aa
Black text reads best on this color (7.94:1).
About this color
#51A2FE is a medium-light, vivid blue. In OKLCH its lightness is 70%, its chroma 0.157 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.039 away. Black text reads best on it, at 7.94:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.94:1 |
| White text | 2.64:1 |
Values
| HEX | #51A2FE |
| RGB | rgb(81, 162, 254) |
| HSL | hsl(212, 99%, 66%) |
| OKLCH | oklch(70.3% 0.157 253.4) |
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 #51A2FE | 2.64:1 | Fails | Lc -56.3 | Large or bold text, headings |
| Black text on #51A2FE | 7.94:1 | AAA | Lc 52.9 | Large or bold text, headings |
| #51A2FE text on white | 2.64:1 | Fails | Lc 51.1 | Large or bold text, headings |
| #51A2FE text on black | 7.94:1 | AAA | Lc -50.8 | 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
#EFF6FE
oklch(97% 0.013 251.6)
-
Step 100
100
#DDEBFD
oklch(93.5% 0.029 254.7)
-
Step 200
200
#C1DCFD
oklch(88.5% 0.054 253.6)
-
Step 300
300
#94C4FF
oklch(80.8% 0.098 254)
-
Step 400
400 (this color)
#51A2FE
oklch(70.3% 0.157 253.4)
-
Step 500
500
#0089FC
oklch(63.2% 0.197 253.3)
-
Step 600
600
#0073D5
oklch(55.7% 0.173 253.3)
-
Step 700
700
#0060B4
oklch(49.1% 0.153 253.4)
-
Step 800
800
#004E95
oklch(42.6% 0.134 253.6)
-
Step 900
900
#00417E
oklch(37.7% 0.118 253.6)
-
Step 950
950
#01264D
oklch(26.9% 0.083 253.5)
#51A2FE 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) | #79A8FF | 0.043 |
| Deuteranopia (no green cones) | #5F98FC | 0.027 |
| Tritanopia (no blue cones) | #00B7C4 | 0.121 |
| Achromatopsia (no color) | #9F9F9F | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51A2FE
#51A2FE
oklch(70.3% 0.157 253.4)
- #D68E00
#D68E00
oklch(70.2% 0.149 73.3)
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 #51A2FE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.039
- Chefchaouen Blue #4895EF ΔE 0.040
- Dodger Blue #1E90FF ΔE 0.061
- Dark Sky Blue #448EE4 ΔE 0.063
- Periwinkle Blue #8F99FB ΔE 0.066
- Soft Blue #6488EA ΔE 0.068
- Deep Sky Blue #00BFFF ΔE 0.078
- Perrywinkle #8F8CE7 ΔE 0.083
Use #51A2FE 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.