#51CFBF
Closest named color: Medium Turquoise (#48D1CC). oklch(78% 0.113 183.6), rgb(81, 207, 191).
Aa
Black text reads best on this color (11.02:1).
About this color
#51CFBF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 78%, its chroma 0.113 and its hue 184°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Turquoise (#48D1CC), ΔE 0.017 away. Black text reads best on it, at 11.02:1.
| Hue family | Teals and cyans |
| Lightness | light (78%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Medium Turquoise (#48D1CC) |
| Black text | 11.02:1 |
| White text | 1.90:1 |
Values
| HEX | #51CFBF |
| RGB | rgb(81, 207, 191) |
| HSL | hsl(172, 57%, 56%) |
| OKLCH | oklch(78% 0.113 183.6) |
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 #51CFBF | 1.90:1 | Fails | Lc -40.2 | Non-text elements, placeholder text |
| Black text on #51CFBF | 11.02:1 | AAA | Lc 67.9 | Content text, not long reading |
| #51CFBF text on white | 1.90:1 | Fails | Lc 36.0 | Non-text elements, placeholder text |
| #51CFBF text on black | 11.02:1 | AAA | Lc -66.5 | 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 300.
-
Step 50
50
#EBF9F6
oklch(97.1% 0.015 181.8)
-
Step 100
100
#D3F1EC
oklch(93.5% 0.032 184.5)
-
Step 200
200
#ABE7DD
oklch(88.4% 0.062 183.5)
-
Step 300
300 (this color)
#51CFBF
oklch(78% 0.113 183.6)
-
Step 400
400
#00B9A9
oklch(70.6% 0.125 184)
-
Step 500
500
#009F91
oklch(63.1% 0.112 184)
-
Step 600
600
#008679
oklch(55.7% 0.099 183.1)
-
Step 700
700
#007066
oklch(49% 0.087 184.2)
-
Step 800
800
#005C53
oklch(42.6% 0.076 183.4)
-
Step 900
900
#004D45
oklch(37.7% 0.067 183.1)
-
Step 950
950
#002E29
oklch(27.1% 0.048 183.6)
#51CFBF 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) | #C6C4BE | 0.121 |
| Deuteranopia (no green cones) | #B3B6C1 | 0.115 |
| Tritanopia (no blue cones) | #00D3CA | 0.025 |
| Achromatopsia (no color) | #BCBCBC | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51CFBF
#51CFBF
oklch(78% 0.113 183.6)
- #F498B0
#F498B0
oklch(78% 0.113 3.1)
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 #51CFBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Turquoise #48D1CC ΔE 0.017
- Medium Aquamarine #66CDAA ΔE 0.029
- Seafoam Blue #78D1B6 ΔE 0.032
- Dark Turquoise #00CED1 ΔE 0.034
- Pale Teal #82CBB2 ΔE 0.039
- Turquoise #40E0D0 ΔE 0.046
- Aqua Blue #02D8E9 ΔE 0.058
- Tiffany Blue #94D2BD ΔE 0.059
Use #51CFBF 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.