#51F1E5
Closest named color: Bright Aqua (#0BF9EA). oklch(87.3% 0.132 187.8), rgb(81, 241, 229).
Aa
Black text reads best on this color (15.06:1).
About this color
#51F1E5 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 87%, its chroma 0.132 and its hue 188°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Aqua (#0BF9EA), ΔE 0.025 away. Black text reads best on it, at 15.06:1.
| Hue family | Teals and cyans |
| Lightness | light (87%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Bright Aqua (#0BF9EA) |
| Black text | 15.06:1 |
| White text | 1.39:1 |
Values
| HEX | #51F1E5 |
| RGB | rgb(81, 241, 229) |
| HSL | hsl(176, 85%, 63%) |
| OKLCH | oklch(87.3% 0.132 187.8) |
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 #51F1E5 | 1.39:1 | Fails | Lc -21.4 | Dividers and decoration only |
| Black text on #51F1E5 | 15.06:1 | AAA | Lc 84.9 | Fine for body text |
| #51F1E5 text on white | 1.39:1 | Fails | Lc 18.7 | Dividers and decoration only |
| #51F1E5 text on black | 15.06:1 | AAA | Lc -84.8 | 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
#C6F5F0
oklch(93.6% 0.049 188.4)
-
Step 200
200 (this color)
#51F1E5
oklch(87.3% 0.132 187.8)
-
Step 300
300
#00DDD1
oklch(80.9% 0.141 187.9)
-
Step 400
400
#00B9AE
oklch(70.8% 0.123 187.3)
-
Step 500
500
#009E96
oklch(63% 0.109 188.5)
-
Step 600
600
#00857E
oklch(55.6% 0.097 188.3)
-
Step 700
700
#007069
oklch(49.1% 0.086 187.3)
-
Step 800
800
#005C56
oklch(42.8% 0.075 187.1)
-
Step 900
900
#004D48
oklch(37.8% 0.066 187.3)
-
Step 950
950
#002E2B
oklch(27.1% 0.047 188)
#51F1E5 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) | #E4E4E5 | 0.140 |
| Deuteranopia (no green cones) | #CDD3E7 | 0.133 |
| Tritanopia (no blue cones) | #00F7ED | 0.022 |
| Achromatopsia (no color) | #DADADA | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51F1E5
#51F1E5
oklch(87.3% 0.132 187.8)
- #FFC3CC
#FFC3CC
oklch(87.3% 0.07 8.6)
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 #51F1E5, closest first.
No curated palette has a color within ΔE 0.04 of #51F1E5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Aqua #0BF9EA ΔE 0.025
- Bright Light Blue #26F7FD ΔE 0.032
- Bright Turquoise #0FFEF9 ΔE 0.037
- Bright Cyan #41FDFE ΔE 0.039
- Cyan #00FFFF ΔE 0.043
- Robin's Egg #6DEDFD ΔE 0.044
- Light Turquoise #7EF4CC ΔE 0.045
- Turquoise #40E0D0 ΔE 0.051
Use #51F1E5 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.