#63B0DB
Closest named color: Greyblue (#77A1B5). oklch(72.4% 0.099 234.8), rgb(99, 176, 219).
Aa
Black text reads best on this color (8.76:1).
About this color
#63B0DB is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.099 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.060 away. Black text reads best on it, at 8.76:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 8.76:1 |
| White text | 2.39:1 |
Values
| HEX | #63B0DB |
| RGB | rgb(99, 176, 219) |
| HSL | hsl(202, 62%, 62%) |
| OKLCH | oklch(72.4% 0.099 234.8) |
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 #63B0DB | 2.39:1 | Fails | Lc -52.0 | Large or bold text, headings |
| Black text on #63B0DB | 8.76:1 | AAA | Lc 56.9 | Large or bold text, headings |
| #63B0DB text on white | 2.39:1 | Fails | Lc 47.0 | Large or bold text, headings |
| #63B0DB text on black | 8.76:1 | AAA | Lc -55.0 | 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
#F0F6FA
oklch(97% 0.008 236.6)
-
Step 100
100
#DFECF4
oklch(93.6% 0.018 234.5)
-
Step 200
200
#C4DDED
oklch(88.4% 0.035 235.9)
-
Step 300
300
#9AC8E3
oklch(80.9% 0.062 234.3)
-
Step 400
400 (this color)
#63B0DB
oklch(72.4% 0.099 234.8)
-
Step 500
500
#1D94CA
oklch(63% 0.126 234.9)
-
Step 600
600
#007DAE
oklch(55.7% 0.118 234.9)
-
Step 700
700
#006993
oklch(49.2% 0.104 234.9)
-
Step 800
800
#005679
oklch(42.8% 0.09 234.7)
-
Step 900
900
#004765
oklch(37.6% 0.08 234.9)
-
Step 950
950
#052A3C
oklch(27% 0.052 234.9)
#63B0DB 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) | #9CAEDD | 0.063 |
| Deuteranopia (no green cones) | #8BA2DA | 0.053 |
| Tritanopia (no blue cones) | #00BBBE | 0.076 |
| Achromatopsia (no color) | #A7A7A7 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B0DB
#63B0DB
oklch(72.4% 0.099 234.8)
- #D69569
#D69569
oklch(72.4% 0.098 54.6)
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 #63B0DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.060
- Turquoise Blue #06B1C4 ΔE 0.061
- Deep Sky Blue #00BFFF ΔE 0.063
- Bluegrey #85A3B2 ΔE 0.065
- Vivid Sky Blue #4CC9F0 ΔE 0.067
- Carolina Blue #8AB8FE ΔE 0.070
- Bluey Grey #89A0B0 ΔE 0.071
- Cool Steel #97A7B3 ΔE 0.074
Use #63B0DB 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.