#51AFCC
Closest named color: Turquoise Blue (#06B1C4). oklch(70.9% 0.098 221.1), rgb(81, 175, 204).
Aa
Black text reads best on this color (8.35:1).
About this color
#51AFCC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 71%, its chroma 0.098 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.034 away. Black text reads best on it, at 8.35:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.35:1 |
| White text | 2.51:1 |
Values
| HEX | #51AFCC |
| RGB | rgb(81, 175, 204) |
| HSL | hsl(194, 55%, 56%) |
| OKLCH | oklch(70.9% 0.098 221.1) |
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 #51AFCC | 2.51:1 | Fails | Lc -54.2 | Large or bold text, headings |
| Black text on #51AFCC | 8.35:1 | AAA | Lc 54.9 | Large or bold text, headings |
| #51AFCC text on white | 2.51:1 | Fails | Lc 49.1 | Large or bold text, headings |
| #51AFCC text on black | 8.35:1 | AAA | Lc -52.9 | 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
#F0F7F9
oklch(97.1% 0.008 216.6)
-
Step 100
100
#DEEDF2
oklch(93.6% 0.017 219.7)
-
Step 200
200
#C2DFE9
oklch(88.6% 0.034 220.6)
-
Step 300
300
#95CADD
oklch(80.9% 0.061 222.1)
-
Step 400
400 (this color)
#51AFCC
oklch(70.9% 0.098 221.1)
-
Step 500
500
#0099BA
oklch(63.2% 0.115 220.3)
-
Step 600
600
#00809D
oklch(55.6% 0.102 221.1)
-
Step 700
700
#006C85
oklch(49.2% 0.09 221.2)
-
Step 800
800
#00586D
oklch(42.6% 0.078 221.3)
-
Step 900
900
#00495B
oklch(37.6% 0.069 221.4)
-
Step 950
950
#002C37
oklch(27.1% 0.049 219.4)
#51AFCC 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) | #9EABCE | 0.081 |
| Deuteranopia (no green cones) | #8C9ECC | 0.072 |
| Tritanopia (no blue cones) | #00B8B8 | 0.055 |
| Achromatopsia (no color) | #A3A3A3 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51AFCC
#51AFCC
oklch(70.9% 0.098 221.1)
- #D58C71
#D58C71
oklch(70.8% 0.098 41.1)
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 #51AFCC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.034
- Greyblue #77A1B5 ΔE 0.050
- Bluegrey #85A3B2 ΔE 0.060
- Light Sea Green #20B2AA ΔE 0.063
- Bluey Grey #89A0B0 ΔE 0.067
- Cadet Blue #5F9EA0 ΔE 0.068
- Topaz #13BBAF ΔE 0.070
- Cool Steel #97A7B3 ΔE 0.075
Use #51AFCC 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.