#51CBBA
Closest named color: Medium Turquoise (#48D1CC). oklch(76.9% 0.111 182.6), rgb(81, 203, 186).
Aa
Black text reads best on this color (10.60:1).
About this color
#51CBBA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 77%, its chroma 0.111 and its hue 183°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Turquoise (#48D1CC), ΔE 0.026 away. Black text reads best on it, at 10.60:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Medium Turquoise (#48D1CC) |
| Black text | 10.60:1 |
| White text | 1.98:1 |
Values
| HEX | #51CBBA |
| RGB | rgb(81, 203, 186) |
| HSL | hsl(172, 54%, 56%) |
| OKLCH | oklch(76.9% 0.111 182.6) |
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 #51CBBA | 1.98:1 | Fails | Lc -42.4 | Non-text elements, placeholder text |
| Black text on #51CBBA | 10.60:1 | AAA | Lc 65.9 | Content text, not long reading |
| #51CBBA text on white | 1.98:1 | Fails | Lc 38.0 | Non-text elements, placeholder text |
| #51CBBA text on black | 10.60:1 | AAA | Lc -64.4 | 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
#ACE7DC
oklch(88.5% 0.062 182.1)
-
Step 300
300 (this color)
#51CBBA
oklch(76.9% 0.111 182.6)
-
Step 400
400
#00BAA7
oklch(70.8% 0.127 182.2)
-
Step 500
500
#009F8F
oklch(63.1% 0.113 182.5)
-
Step 600
600
#008678
oklch(55.6% 0.1 182.2)
-
Step 700
700
#007165
oklch(49.2% 0.088 182.2)
-
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
#002E28
oklch(27% 0.049 181.5)
#51CBBA 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) | #C2C0B9 | 0.118 |
| Deuteranopia (no green cones) | #B0B2BC | 0.113 |
| Tritanopia (no blue cones) | #00CFC6 | 0.026 |
| Achromatopsia (no color) | #B8B8B8 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51CBBA
#51CBBA
oklch(76.9% 0.111 182.6)
- #EF95AD
#EF95AD
oklch(76.8% 0.112 2.8)
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 #51CBBA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Turquoise #48D1CC ΔE 0.026
- Medium Aquamarine #66CDAA ΔE 0.028
- Dark Turquoise #00CED1 ΔE 0.036
- Seafoam Blue #78D1B6 ΔE 0.037
- Pale Teal #82CBB2 ΔE 0.040
- Topaz #13BBAF ΔE 0.057
- Turquoise #40E0D0 ΔE 0.057
- Emerald #06D6A0 ΔE 0.062
Use #51CBBA 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.