#51BBBD
Closest named color: Topaz (#13BBAF). oklch(73.2% 0.097 197), rgb(81, 187, 189).
Aa
Black text reads best on this color (9.19:1).
About this color
#51BBBD is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.097 and its hue 197°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.037 away. Black text reads best on it, at 9.19:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.19:1 |
| White text | 2.28:1 |
Values
| HEX | #51BBBD |
| RGB | rgb(81, 187, 189) |
| HSL | hsl(181, 45%, 53%) |
| OKLCH | oklch(73.2% 0.097 197) |
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 #51BBBD | 2.28:1 | Fails | Lc -49.6 | Large or bold text, headings |
| Black text on #51BBBD | 9.19:1 | AAA | Lc 59.2 | Large or bold text, headings |
| #51BBBD text on white | 2.28:1 | Fails | Lc 44.8 | Non-text elements, placeholder text |
| #51BBBD text on black | 9.19:1 | AAA | Lc -57.3 | 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
#DDEEEE
oklch(93.7% 0.018 196.8)
-
Step 200
200
#C1E0E1
oklch(88.4% 0.033 199)
-
Step 300
300
#92CDCE
oklch(80.8% 0.06 197.3)
-
Step 400
400 (this color)
#51BBBD
oklch(73.2% 0.097 197)
-
Step 500
500
#009DA0
oklch(63.1% 0.107 197.2)
-
Step 600
600
#008486
oklch(55.6% 0.095 196.7)
-
Step 700
700
#006F71
oklch(49.1% 0.084 197)
-
Step 800
800
#005B5D
oklch(42.7% 0.073 197.4)
-
Step 900
900
#004C4D
oklch(37.8% 0.064 196.3)
-
Step 950
950
#002D2E
oklch(27% 0.046 197.1)
#51BBBD 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) | #AFB3BD | 0.100 |
| Deuteranopia (no green cones) | #9EA6BE | 0.094 |
| Tritanopia (no blue cones) | #00C1BB | 0.032 |
| Achromatopsia (no color) | #ABABAB | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BBBD
#51BBBD
oklch(73.2% 0.097 197)
- #DE8F92
#DE8F92
oklch(73.1% 0.096 17.2)
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 #51BBBD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.037
- Light Sea Green #20B2AA ΔE 0.046
- Turquoise Blue #06B1C4 ΔE 0.047
- Dark Turquoise #00CED1 ΔE 0.053
- Medium Turquoise #48D1CC ΔE 0.059
- Greeny Blue #42B395 ΔE 0.060
- Medium Aquamarine #66CDAA ΔE 0.069
- Pale Teal #82CBB2 ΔE 0.070
Use #51BBBD 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.