#51BFBB
Closest named color: Topaz (#13BBAF). oklch(74% 0.1 191.9), rgb(81, 191, 187).
Aa
Black text reads best on this color (9.51:1).
About this color
#51BFBB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.100 and its hue 192°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.036 away. Black text reads best on it, at 9.51:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.51:1 |
| White text | 2.20:1 |
Values
| HEX | #51BFBB |
| RGB | rgb(81, 191, 187) |
| HSL | hsl(178, 46%, 53%) |
| OKLCH | oklch(74% 0.1 191.9) |
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 #51BFBB | 2.20:1 | Fails | Lc -47.9 | Large or bold text, headings |
| Black text on #51BFBB | 9.51:1 | AAA | Lc 60.8 | Content text, not long reading |
| #51BFBB text on white | 2.20:1 | Fails | Lc 43.2 | Non-text elements, placeholder text |
| #51BFBB text on black | 9.51:1 | AAA | Lc -59.0 | 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
#EFF7F7
oklch(97% 0.008 197)
-
Step 100
100
#DDEEED
oklch(93.6% 0.018 192.6)
-
Step 200
200
#C0E1DF
oklch(88.5% 0.035 192)
-
Step 300
300
#91CECB
oklch(80.9% 0.062 192.1)
-
Step 400
400 (this color)
#51BFBB
oklch(74% 0.1 191.9)
-
Step 500
500
#009E9A
oklch(63.2% 0.109 191.6)
-
Step 600
600
#008582
oklch(55.7% 0.096 192)
-
Step 700
700
#006F6D
oklch(49% 0.084 192.6)
-
Step 800
800
#005B59
oklch(42.6% 0.073 192.2)
-
Step 900
900
#004C4A
oklch(37.6% 0.065 191.7)
-
Step 950
950
#002D2C
oklch(26.9% 0.046 192.5)
#51BFBB 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) | #B4B6BB | 0.105 |
| Deuteranopia (no green cones) | #A3A9BC | 0.099 |
| Tritanopia (no blue cones) | #00C4BD | 0.028 |
| Achromatopsia (no color) | #AFAFAF | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BFBB
#51BFBB
oklch(74% 0.1 191.9)
- #E2909A
#E2909A
oklch(74% 0.1 11.9)
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 #51BFBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.036
- Dark Turquoise #00CED1 ΔE 0.045
- Medium Turquoise #48D1CC ΔE 0.049
- Light Sea Green #20B2AA ΔE 0.052
- Medium Aquamarine #66CDAA ΔE 0.056
- Turquoise Blue #06B1C4 ΔE 0.058
- Greeny Blue #42B395 ΔE 0.060
- Pale Teal #82CBB2 ΔE 0.060
Use #51BFBB 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.