#63ACE0
Closest named color: Greyblue (#77A1B5). oklch(71.8% 0.106 241.3), rgb(99, 172, 224).
Aa
Black text reads best on this color (8.50:1).
About this color
#63ACE0 is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.106 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.063 away. Black text reads best on it, at 8.50:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 8.50:1 |
| White text | 2.46:1 |
Values
| HEX | #63ACE0 |
| RGB | rgb(99, 172, 224) |
| HSL | hsl(205, 67%, 63%) |
| OKLCH | oklch(71.8% 0.106 241.3) |
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 #63ACE0 | 2.46:1 | Fails | Lc -53.4 | Large or bold text, headings |
| Black text on #63ACE0 | 8.50:1 | AAA | Lc 55.6 | Large or bold text, headings |
| #63ACE0 text on white | 2.46:1 | Fails | Lc 48.4 | Large or bold text, headings |
| #63ACE0 text on black | 8.50:1 | AAA | Lc -53.6 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C5DDF0
oklch(88.6% 0.037 241.8)
-
Step 300
300
#9BC7E8
oklch(81% 0.066 241)
-
Step 400
400 (this color)
#63ACE0
oklch(71.8% 0.106 241.3)
-
Step 500
500
#2592D3
oklch(63.2% 0.135 241.1)
-
Step 600
600
#007BB8
oklch(55.7% 0.13 241.1)
-
Step 700
700
#00679B
oklch(49.1% 0.115 241)
-
Step 800
800
#005480
oklch(42.6% 0.1 241.3)
-
Step 900
900
#01466C
oklch(37.7% 0.088 241.7)
-
Step 950
950
#07293F
oklch(26.9% 0.056 241.9)
#63ACE0 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) | #95ACE2 | 0.055 |
| Deuteranopia (no green cones) | #849FDF | 0.046 |
| Tritanopia (no blue cones) | #00B9BE | 0.085 |
| Achromatopsia (no color) | #A5A5A5 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63ACE0
#63ACE0
oklch(71.8% 0.106 241.3)
- #D4945C
#D4945C
oklch(71.8% 0.106 61.1)
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 #63ACE0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.063
- Deep Sky Blue #00BFFF ΔE 0.065
- Carolina Blue #8AB8FE ΔE 0.068
- Turquoise Blue #06B1C4 ΔE 0.069
- Bluegrey #85A3B2 ΔE 0.070
- Cornflower Blue #6495ED ΔE 0.070
- Bluey Grey #89A0B0 ΔE 0.075
- Vivid Sky Blue #4CC9F0 ΔE 0.076
Use #63ACE0 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.