#51D2F4
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(80.6% 0.121 218.7), rgb(81, 210, 244).
Aa
Black text reads best on this color (11.87:1).
About this color
#51D2F4 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 81%, its chroma 0.121 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.025 away. Black text reads best on it, at 11.87:1.
| Hue family | Teals and cyans |
| Lightness | light (81%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 11.87:1 |
| White text | 1.76:1 |
Values
| HEX | #51D2F4 |
| RGB | rgb(81, 210, 244) |
| HSL | hsl(193, 88%, 64%) |
| OKLCH | oklch(80.6% 0.121 218.7) |
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 #51D2F4 | 1.76:1 | Fails | Lc -36.1 | Non-text elements, placeholder text |
| Black text on #51D2F4 | 11.87:1 | AAA | Lc 71.7 | Content text, not long reading |
| #51D2F4 text on white | 1.76:1 | Fails | Lc 32.1 | Non-text elements, placeholder text |
| #51D2F4 text on black | 11.87:1 | AAA | Lc -70.5 | 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
#EAF8FD
oklch(97% 0.016 221.1)
-
Step 100
100
#D1F0FA
oklch(93.6% 0.035 219.2)
-
Step 200
200
#A7E4F7
oklch(88.4% 0.067 219.1)
-
Step 300
300 (this color)
#51D2F4
oklch(80.6% 0.121 218.7)
-
Step 400
400
#00B3D6
oklch(70.8% 0.128 218.5)
-
Step 500
500
#0099B8
oklch(63.1% 0.114 219)
-
Step 600
600
#00819B
oklch(55.7% 0.1 218.5)
-
Step 700
700
#006C82
oklch(49.1% 0.088 218.4)
-
Step 800
800
#00596B
oklch(42.8% 0.077 217.7)
-
Step 900
900
#004A5A
oklch(37.8% 0.068 218.5)
-
Step 950
950
#002C36
oklch(27% 0.048 217.4)
#51D2F4 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) | #BCCCF6 | 0.103 |
| Deuteranopia (no green cones) | #A5BBF4 | 0.093 |
| Tritanopia (no blue cones) | #00DEDD | 0.059 |
| Achromatopsia (no color) | #C3C3C3 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51D2F4
#51D2F4
oklch(80.6% 0.121 218.7)
- #FFA689
#FFA689
oklch(80.7% 0.113 38.8)
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 #51D2F4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.025
- Aqua Blue #02D8E9 ΔE 0.035
- Bright Sky Blue #02CCFE ΔE 0.036
- Lightblue #7BC8F6 ΔE 0.040
- Sky Blue #87CEEB ΔE 0.042
- Light Sky Blue #87CEFA ΔE 0.045
- Sky #82CAFC ΔE 0.046
- Medium Turquoise #48D1CC ΔE 0.059
Use #51D2F4 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.