#51BBB5
Closest named color: Topaz (#13BBAF). oklch(72.9% 0.098 190.1), rgb(81, 187, 181).
Aa
Black text reads best on this color (9.12:1).
About this color
#51BBB5 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.098 and its hue 190°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.030 away. Black text reads best on it, at 9.12:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.12:1 |
| White text | 2.30:1 |
Values
| HEX | #51BBB5 |
| RGB | rgb(81, 187, 181) |
| HSL | hsl(177, 44%, 53%) |
| OKLCH | oklch(72.9% 0.098 190.1) |
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 #51BBB5 | 2.30:1 | Fails | Lc -50.0 | Large or bold text, headings |
| Black text on #51BBB5 | 9.12:1 | AAA | Lc 58.8 | Large or bold text, headings |
| #51BBB5 text on white | 2.30:1 | Fails | Lc 45.1 | Large or bold text, headings |
| #51BBB5 text on black | 9.12:1 | AAA | Lc -57.0 | 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
#F0F7F7
oklch(97.1% 0.007 197)
-
Step 100
100
#DDEEEC
oklch(93.6% 0.018 188.4)
-
Step 200
200
#C1E1DE
oklch(88.6% 0.034 189.6)
-
Step 300
300
#93CEC9
oklch(81% 0.061 189.4)
-
Step 400
400 (this color)
#51BBB5
oklch(72.9% 0.098 190.1)
-
Step 500
500
#009E98
oklch(63.1% 0.109 190)
-
Step 600
600
#008580
oklch(55.7% 0.096 190.1)
-
Step 700
700
#00706B
oklch(49.2% 0.085 189.4)
-
Step 800
800
#005C58
oklch(42.8% 0.074 189.6)
-
Step 900
900
#004C49
oklch(37.6% 0.065 190.2)
-
Step 950
950
#002E2B
oklch(27.1% 0.047 188)
#51BBB5 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) | #B1B2B5 | 0.103 |
| Deuteranopia (no green cones) | #A0A6B6 | 0.096 |
| Tritanopia (no blue cones) | #00C0B9 | 0.028 |
| Achromatopsia (no color) | #ABABAB | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BBB5
#51BBB5
oklch(72.9% 0.098 190.1)
- #DD8D99
#DD8D99
oklch(72.8% 0.098 10)
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 #51BBB5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.030
- Light Sea Green #20B2AA ΔE 0.041
- Greeny Blue #42B395 ΔE 0.049
- Turquoise Blue #06B1C4 ΔE 0.052
- Dark Turquoise #00CED1 ΔE 0.056
- Medium Turquoise #48D1CC ΔE 0.061
- Medium Aquamarine #66CDAA ΔE 0.063
- Muted Teal #90B494 ΔE 0.067
Use #51BBB5 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.