#51F9FB
Closest named color: Bright Cyan (#41FDFE). oklch(89.9% 0.135 196.2), rgb(81, 249, 251).
Aa
Black text reads best on this color (16.29:1).
About this color
#51F9FB is a light, moderately saturated teal or cyan. In OKLCH its lightness is 90%, its chroma 0.135 and its hue 196°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Cyan (#41FDFE), ΔE 0.011 away. Black text reads best on it, at 16.29:1.
| Hue family | Teals and cyans |
| Lightness | light (90%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Bright Cyan (#41FDFE) |
| Black text | 16.29:1 |
| White text | 1.28:1 |
Values
| HEX | #51F9FB |
| RGB | rgb(81, 249, 251) |
| HSL | hsl(181, 96%, 65%) |
| OKLCH | oklch(89.9% 0.135 196.2) |
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 #51F9FB | 1.28:1 | Fails | Lc -16.0 | Dividers and decoration only |
| Black text on #51F9FB | 16.29:1 | AAA | Lc 89.7 | Fine for body text |
| #51F9FB text on white | 1.28:1 | Fails | Lc 13.9 | Not readable |
| #51F9FB text on black | 16.29:1 | AAA | Lc -89.9 | Fine for body text |
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 200.
-
Step 50
50
#E5FBFB
oklch(97.2% 0.023 196.8)
-
Step 100
100
#C4F5F5
oklch(93.6% 0.05 196.3)
-
Step 200
200 (this color)
#51F9FB
oklch(89.9% 0.135 196.2)
-
Step 300
300
#00DBDE
oklch(80.8% 0.138 196.5)
-
Step 400
400
#00B7B9
oklch(70.6% 0.12 196.2)
-
Step 500
500
#009D9F
oklch(63.1% 0.107 196.4)
-
Step 600
600
#008486
oklch(55.6% 0.095 196.7)
-
Step 700
700
#006F70
oklch(49.1% 0.084 195.9)
-
Step 800
800
#005B5C
oklch(42.7% 0.073 196.1)
-
Step 900
900
#004C4D
oklch(37.8% 0.064 196.3)
-
Step 950
950
#002D2E
oklch(27% 0.046 197.1)
#51F9FB 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) | #E9EDFB | 0.140 |
| Deuteranopia (no green cones) | #CFDBFC | 0.130 |
| Tritanopia (no blue cones) | #00FFF9 | 0.024 |
| Achromatopsia (no color) | #E3E3E3 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51F9FB
#51F9FB
oklch(89.9% 0.135 196.2)
- #FFD0D2
#FFD0D2
oklch(89.9% 0.053 15.3)
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 #51F9FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Cyan #41FDFE ΔE 0.011
- Bright Light Blue #26F7FD ΔE 0.017
- Cyan #00FFFF ΔE 0.021
- Bright Turquoise #0FFEF9 ΔE 0.022
- Bright Aqua #0BF9EA ΔE 0.033
- Robin's Egg #6DEDFD ΔE 0.035
- Robin Egg Blue #8AF1FE ΔE 0.042
- Robin's Egg Blue #98EFF9 ΔE 0.053
Use #51F9FB 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.