#51BEDB
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75% 0.107 218.3), rgb(81, 190, 219).
Aa
Black text reads best on this color (9.73:1).
About this color
#51BEDB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.107 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.037 away. Black text reads best on it, at 9.73:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.73:1 |
| White text | 2.15:1 |
Values
| HEX | #51BEDB |
| RGB | rgb(81, 190, 219) |
| HSL | hsl(193, 66%, 59%) |
| OKLCH | oklch(75% 0.107 218.3) |
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 #51BEDB | 2.15:1 | Fails | Lc -46.8 | Large or bold text, headings |
| Black text on #51BEDB | 9.73:1 | AAA | Lc 61.9 | Content text, not long reading |
| #51BEDB text on white | 2.15:1 | Fails | Lc 42.1 | Non-text elements, placeholder text |
| #51BEDB text on black | 9.73:1 | AAA | Lc -60.1 | 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 400.
-
Step 50
50
#EFF7F9
oklch(97.1% 0.009 214.3)
-
Step 100
100
#DCEDF3
oklch(93.5% 0.02 220.9)
-
Step 200
200
#BFE0EA
oklch(88.6% 0.037 218)
-
Step 300
300
#8FCCDE
oklch(81% 0.067 218.2)
-
Step 400
400 (this color)
#51BEDB
oklch(75% 0.107 218.3)
-
Step 500
500
#0099B7
oklch(63.1% 0.114 218.3)
-
Step 600
600
#00819A
oklch(55.7% 0.1 217.7)
-
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)
#51BEDB 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) | #ABB9DD | 0.091 |
| Deuteranopia (no green cones) | #98AADB | 0.083 |
| Tritanopia (no blue cones) | #00C8C7 | 0.054 |
| Achromatopsia (no color) | #B1B1B1 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BEDB
#51BEDB
oklch(75% 0.107 218.3)
- #E8967C
#E8967C
oklch(75% 0.106 38.3)
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 #51BEDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.037
- Bright Sky Blue #02CCFE ΔE 0.055
- Dark Turquoise #00CED1 ΔE 0.056
- Deep Sky Blue #00BFFF ΔE 0.056
- Turquoise Blue #06B1C4 ΔE 0.059
- Lightblue #7BC8F6 ΔE 0.060
- Medium Turquoise #48D1CC ΔE 0.064
- Light Cornflower Blue #98C1D9 ΔE 0.068
Use #51BEDB 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.