#51EFFB
Closest named color: Robin's Egg (#6DEDFD). oklch(87.6% 0.13 202.4), rgb(81, 239, 251).
Aa
Black text reads best on this color (15.08:1).
About this color
#51EFFB is a light, moderately saturated teal or cyan. In OKLCH its lightness is 88%, its chroma 0.130 and its hue 202°. Its hue sits on the cool side of the wheel. The nearest named color is Robin's Egg (#6DEDFD), ΔE 0.018 away. Black text reads best on it, at 15.08:1.
| Hue family | Teals and cyans |
| Lightness | light (88%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Robin's Egg (#6DEDFD) |
| Black text | 15.08:1 |
| White text | 1.39:1 |
Values
| HEX | #51EFFB |
| RGB | rgb(81, 239, 251) |
| HSL | hsl(184, 96%, 65%) |
| OKLCH | oklch(87.6% 0.13 202.4) |
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 #51EFFB | 1.39:1 | Fails | Lc -21.3 | Dividers and decoration only |
| Black text on #51EFFB | 15.08:1 | AAA | Lc 85.0 | Fine for body text |
| #51EFFB text on white | 1.39:1 | Fails | Lc 18.6 | Dividers and decoration only |
| #51EFFB text on black | 15.08:1 | AAA | Lc -84.9 | 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
#E5FAFC
oklch(97% 0.022 203.7)
-
Step 100
100
#C5F4F8
oklch(93.6% 0.048 202.8)
-
Step 200
200 (this color)
#51EFFB
oklch(87.6% 0.13 202.4)
-
Step 300
300
#00DAE7
oklch(80.9% 0.138 202.5)
-
Step 400
400
#00B6C1
oklch(70.7% 0.12 202.5)
-
Step 500
500
#009CA6
oklch(63.1% 0.107 202.8)
-
Step 600
600
#00838B
oklch(55.5% 0.095 202.3)
-
Step 700
700
#006E75
oklch(49% 0.083 202.5)
-
Step 800
800
#005A60
oklch(42.6% 0.073 202.7)
-
Step 900
900
#004B50
oklch(37.6% 0.064 202.5)
-
Step 950
950
#002D30
oklch(27% 0.046 201.8)
#51EFFB 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) | #DDE5FC | 0.130 |
| Deuteranopia (no green cones) | #C4D3FC | 0.120 |
| Tritanopia (no blue cones) | #00F8F2 | 0.036 |
| Achromatopsia (no color) | #DADADA | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51EFFB
#51EFFB
oklch(87.6% 0.13 202.4)
- #FFC6C2
#FFC6C2
oklch(87.6% 0.066 23.1)
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 #51EFFB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Robin's Egg #6DEDFD ΔE 0.018
- Bright Light Blue #26F7FD ΔE 0.023
- Bright Cyan #41FDFE ΔE 0.037
- Robin Egg Blue #8AF1FE ΔE 0.041
- Cyan #00FFFF ΔE 0.043
- Bright Turquoise #0FFEF9 ΔE 0.043
- Bright Aqua #0BF9EA ΔE 0.046
- Robin's Egg Blue #98EFF9 ΔE 0.051
Use #51EFFB 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.