#51C2FC
Closest named color: Deep Sky Blue (#00BFFF). oklch(77.3% 0.131 234.5), rgb(81, 194, 252).
Aa
Black text reads best on this color (10.47:1).
About this color
#51C2FC is a medium-light, moderately saturated blue. In OKLCH its lightness is 77%, its chroma 0.131 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.030 away. Black text reads best on it, at 10.47:1.
| Hue family | Blues |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 10.47:1 |
| White text | 2.00:1 |
Values
| HEX | #51C2FC |
| RGB | rgb(81, 194, 252) |
| HSL | hsl(200, 97%, 65%) |
| OKLCH | oklch(77.3% 0.131 234.5) |
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 #51C2FC | 2.00:1 | Fails | Lc -43.0 | Non-text elements, placeholder text |
| Black text on #51C2FC | 10.47:1 | AAA | Lc 65.4 | Content text, not long reading |
| #51C2FC text on white | 2.00:1 | Fails | Lc 38.5 | Non-text elements, placeholder text |
| #51C2FC text on black | 10.47:1 | AAA | Lc -63.8 | Content text, not long reading |
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 300.
-
Step 50
50
#ECF8FF
oklch(97.2% 0.016 233)
-
Step 100
100
#D3EFFF
oklch(93.7% 0.037 232.8)
-
Step 200
200
#AFE1FF
oklch(88.5% 0.066 234.8)
-
Step 300
300 (this color)
#51C2FC
oklch(77.3% 0.131 234.5)
-
Step 400
400
#00AEEF
oklch(70.8% 0.149 234.4)
-
Step 500
500
#0095CD
oklch(63.1% 0.132 234.2)
-
Step 600
600
#007DAD
oklch(55.6% 0.117 234.3)
-
Step 700
700
#006992
oklch(49.1% 0.103 234.3)
-
Step 800
800
#005679
oklch(42.8% 0.09 234.7)
-
Step 900
900
#004765
oklch(37.6% 0.08 234.9)
-
Step 950
950
#002A3E
oklch(26.9% 0.057 235.2)
#51C2FC 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) | #A6C0FF | 0.082 |
| Deuteranopia (no green cones) | #8FB0FB | 0.068 |
| Tritanopia (no blue cones) | #00D1D6 | 0.083 |
| Achromatopsia (no color) | #B7B7B7 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51C2FC
#51C2FC
oklch(77.3% 0.131 234.5)
- #F59D5F
#F59D5F
oklch(77.3% 0.131 54.6)
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 #51C2FC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.030
- Vivid Sky Blue #4CC9F0 ΔE 0.030
- Bright Sky Blue #02CCFE ΔE 0.033
- Lightblue #7BC8F6 ΔE 0.041
- Sky #82CAFC ΔE 0.049
- Carolina Blue #8AB8FE ΔE 0.054
- Light Sky Blue #87CEFA ΔE 0.060
- Sky Blue #87CEEB ΔE 0.066
Use #51C2FC 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.