#51BBCC
Closest named color: Turquoise Blue (#06B1C4). oklch(73.7% 0.099 209.6), rgb(81, 187, 204).
Aa
Black text reads best on this color (9.32:1).
About this color
#51BBCC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.099 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.045 away. Black text reads best on it, at 9.32:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 9.32:1 |
| White text | 2.25:1 |
Values
| HEX | #51BBCC |
| RGB | rgb(81, 187, 204) |
| HSL | hsl(188, 55%, 56%) |
| OKLCH | oklch(73.7% 0.099 209.6) |
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 #51BBCC | 2.25:1 | Fails | Lc -48.9 | Large or bold text, headings |
| Black text on #51BBCC | 9.32:1 | AAA | Lc 59.9 | Large or bold text, headings |
| #51BBCC text on white | 2.25:1 | Fails | Lc 44.1 | Non-text elements, placeholder text |
| #51BBCC text on black | 9.32:1 | AAA | Lc -58.0 | 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
#EFF7F8
oklch(97% 0.009 205.9)
-
Step 100
100
#DDEDF0
oklch(93.5% 0.017 210.2)
-
Step 200
200
#C0E0E6
oklch(88.5% 0.035 210.2)
-
Step 300
300
#91CCD7
oklch(80.9% 0.062 210.4)
-
Step 400
400 (this color)
#51BBCC
oklch(73.7% 0.099 209.6)
-
Step 500
500
#009BAD
oklch(63.1% 0.109 209.2)
-
Step 600
600
#008292
oklch(55.6% 0.096 209.8)
-
Step 700
700
#006D7B
oklch(49% 0.085 210.2)
-
Step 800
800
#005A65
oklch(42.8% 0.074 209.1)
-
Step 900
900
#004B54
oklch(37.8% 0.065 208.5)
-
Step 950
950
#002C33
oklch(26.9% 0.047 211.1)
#51BBCC 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) | #ACB5CD | 0.094 |
| Deuteranopia (no green cones) | #99A7CC | 0.086 |
| Tritanopia (no blue cones) | #00C3C0 | 0.043 |
| Achromatopsia (no color) | #ADADAD | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BBCC
#51BBCC
oklch(73.7% 0.099 209.6)
- #E29285
#E29285
oklch(73.8% 0.1 29.7)
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 #51BBCC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.045
- Dark Turquoise #00CED1 ΔE 0.054
- Topaz #13BBAF ΔE 0.055
- Vivid Sky Blue #4CC9F0 ΔE 0.056
- Light Sea Green #20B2AA ΔE 0.061
- Medium Turquoise #48D1CC ΔE 0.062
- Greyblue #77A1B5 ΔE 0.073
- Deep Sky Blue #00BFFF ΔE 0.074
Use #51BBCC 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.