#55ADD3
Closest named color: Turquoise Blue (#06B1C4). oklch(70.8% 0.101 228.9), rgb(85, 173, 211).
Aa
Black text reads best on this color (8.30:1).
About this color
#55ADD3 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 71%, its chroma 0.101 and its hue 229°. 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 8.30:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.30:1 |
| White text | 2.52:1 |
Values
| HEX | #55ADD3 |
| RGB | rgb(85, 173, 211) |
| HSL | hsl(198, 59%, 58%) |
| OKLCH | oklch(70.8% 0.101 228.9) |
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 #55ADD3 | 2.52:1 | Fails | Lc -54.4 | Large or bold text, headings |
| Black text on #55ADD3 | 8.30:1 | AAA | Lc 54.6 | Large or bold text, headings |
| #55ADD3 text on white | 2.52:1 | Fails | Lc 49.4 | Large or bold text, headings |
| #55ADD3 text on black | 8.30:1 | AAA | Lc -52.6 | 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
#F0F7FA
oklch(97.2% 0.008 225.1)
-
Step 100
100
#DEEDF4
oklch(93.7% 0.019 227.3)
-
Step 200
200
#C2DEEC
oklch(88.4% 0.035 229.3)
-
Step 300
300
#96C9E1
oklch(80.8% 0.063 228.6)
-
Step 400
400 (this color)
#55ADD3
oklch(70.8% 0.101 228.9)
-
Step 500
500
#0097C5
oklch(63.2% 0.124 228.7)
-
Step 600
600
#007EA6
oklch(55.5% 0.11 229.3)
-
Step 700
700
#006A8C
oklch(49% 0.097 229.1)
-
Step 800
800
#005773
oklch(42.7% 0.084 228.5)
-
Step 900
900
#004861
oklch(37.6% 0.075 229.8)
-
Step 950
950
#002B3B
oklch(27% 0.053 228.8)
#55ADD3 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) | #99AAD5 | 0.072 |
| Deuteranopia (no green cones) | #889DD3 | 0.064 |
| Tritanopia (no blue cones) | #00B8B9 | 0.067 |
| Achromatopsia (no color) | #A3A3A3 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #55ADD3
#55ADD3
oklch(70.8% 0.101 228.9)
- #D48E68
#D48E68
oklch(70.9% 0.1 49.1)
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 #55ADD3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.045
- Greyblue #77A1B5 ΔE 0.052
- Bluegrey #85A3B2 ΔE 0.062
- Bluey Grey #89A0B0 ΔE 0.068
- Deep Sky Blue #00BFFF ΔE 0.071
- Cadet Blue #5F9EA0 ΔE 0.075
- Light Sea Green #20B2AA ΔE 0.076
- Cool Steel #97A7B3 ΔE 0.077
Use #55ADD3 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.