#51BBB3
Closest named color: Topaz (#13BBAF). oklch(72.8% 0.098 188.5), rgb(81, 187, 179).
Aa
Black text reads best on this color (9.10:1).
About this color
#51BBB3 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.098 and its hue 188°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.028 away. Black text reads best on it, at 9.10:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.10:1 |
| White text | 2.30:1 |
Values
| HEX | #51BBB3 |
| RGB | rgb(81, 187, 179) |
| HSL | hsl(175, 44%, 53%) |
| OKLCH | oklch(72.8% 0.098 188.5) |
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 #51BBB3 | 2.30:1 | Fails | Lc -50.1 | Large or bold text, headings |
| Black text on #51BBB3 | 9.10:1 | AAA | Lc 58.8 | Large or bold text, headings |
| #51BBB3 text on white | 2.30:1 | Fails | Lc 45.2 | Large or bold text, headings |
| #51BBB3 text on black | 9.10:1 | AAA | Lc -56.9 | Large or bold text, headings |
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 400.
-
Step 50
50
#F0F7F6
oklch(97.1% 0.008 186.9)
-
Step 100
100
#DDEEEC
oklch(93.6% 0.018 188.4)
-
Step 200
200
#C1E1DD
oklch(88.5% 0.034 187.4)
-
Step 300
300
#93CEC8
oklch(80.9% 0.061 188.1)
-
Step 400
400 (this color)
#51BBB3
oklch(72.8% 0.098 188.5)
-
Step 500
500
#009E96
oklch(63% 0.109 188.5)
-
Step 600
600
#00857E
oklch(55.6% 0.097 188.3)
-
Step 700
700
#00706A
oklch(49.1% 0.085 188.3)
-
Step 800
800
#005C57
oklch(42.8% 0.074 188.4)
-
Step 900
900
#004C48
oklch(37.6% 0.065 188.7)
-
Step 950
950
#002E2B
oklch(27.1% 0.047 188)
#51BBB3 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) | #B2B2B3 | 0.105 |
| Deuteranopia (no green cones) | #A1A5B4 | 0.099 |
| Tritanopia (no blue cones) | #00BFB8 | 0.027 |
| Achromatopsia (no color) | #ABABAB | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BBB3
#51BBB3
oklch(72.8% 0.098 188.5)
- #DD8D9B
#DD8D9B
oklch(72.9% 0.099 8.4)
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 #51BBB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.028
- Light Sea Green #20B2AA ΔE 0.040
- Greeny Blue #42B395 ΔE 0.047
- Turquoise Blue #06B1C4 ΔE 0.054
- Dark Turquoise #00CED1 ΔE 0.057
- Medium Aquamarine #66CDAA ΔE 0.061
- Medium Turquoise #48D1CC ΔE 0.062
- Muted Teal #90B494 ΔE 0.066
Use #51BBB3 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.