#51FAE9
Closest named color: Bright Aqua (#0BF9EA). oklch(89.5% 0.139 185.3), rgb(81, 250, 233).
Aa
Black text reads best on this color (16.20:1).
About this color
#51FAE9 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 90%, its chroma 0.139 and its hue 185°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Aqua (#0BF9EA), ΔE 0.019 away. Black text reads best on it, at 16.20:1.
| Hue family | Teals and cyans |
| Lightness | light (90%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Bright Aqua (#0BF9EA) |
| Black text | 16.20:1 |
| White text | 1.29:1 |
Values
| HEX | #51FAE9 |
| RGB | rgb(81, 250, 233) |
| HSL | hsl(174, 94%, 65%) |
| OKLCH | oklch(89.5% 0.139 185.3) |
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 #51FAE9 | 1.29:1 | Fails | Lc -16.4 | Dividers and decoration only |
| Black text on #51FAE9 | 16.20:1 | AAA | Lc 89.3 | Fine for body text |
| #51FAE9 text on white | 1.29:1 | Fails | Lc 14.3 | Not readable |
| #51FAE9 text on black | 16.20:1 | AAA | Lc -89.5 | 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
#E5FBF8
oklch(97.1% 0.023 186.9)
-
Step 100
100
#C4F6EE
oklch(93.6% 0.052 184.4)
-
Step 200
200 (this color)
#51FAE9
oklch(89.5% 0.139 185.3)
-
Step 300
300
#00DECD
oklch(81% 0.143 185.1)
-
Step 400
400
#00B9AB
oklch(70.7% 0.124 185.3)
-
Step 500
500
#009F93
oklch(63.2% 0.111 185.4)
-
Step 600
600
#00857B
oklch(55.5% 0.097 185.6)
-
Step 700
700
#007067
oklch(49% 0.086 185.2)
-
Step 800
800
#005C55
oklch(42.7% 0.075 185.9)
-
Step 900
900
#004D46
oklch(37.8% 0.067 184.5)
-
Step 950
950
#002E2A
oklch(27.1% 0.048 185.8)
#51FAE9 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) | #EEECE9 | 0.148 |
| Deuteranopia (no green cones) | #D5DAEB | 0.140 |
| Tritanopia (no blue cones) | #00FFF5 | 0.022 |
| Achromatopsia (no color) | #E2E2E2 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51FAE9
#51FAE9
oklch(89.5% 0.139 185.3)
- #FFCED7
#FFCED7
oklch(89.6% 0.056 5.9)
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 #51FAE9, closest first.
No curated palette has a color within ΔE 0.04 of #51FAE9.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Aqua #0BF9EA ΔE 0.019
- Bright Turquoise #0FFEF9 ΔE 0.024
- Bright Cyan #41FDFE ΔE 0.027
- Cyan #00FFFF ΔE 0.031
- Bright Light Blue #26F7FD ΔE 0.034
- Light Turquoise #7EF4CC ΔE 0.041
- Aquamarine #7FFFD4 ΔE 0.044
- Light Aqua #8CFFDB ΔE 0.046
Use #51FAE9 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.