#64B1DA
Closest named color: Greyblue (#77A1B5). oklch(72.7% 0.097 233.5), rgb(100, 177, 218).
Aa
Black text reads best on this color (8.84:1).
About this color
#64B1DA is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.097 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.059 away. Black text reads best on it, at 8.84:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 8.84:1 |
| White text | 2.37:1 |
Values
| HEX | #64B1DA |
| RGB | rgb(100, 177, 218) |
| HSL | hsl(201, 61%, 62%) |
| OKLCH | oklch(72.7% 0.097 233.5) |
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 #64B1DA | 2.37:1 | Fails | Lc -51.6 | Large or bold text, headings |
| Black text on #64B1DA | 8.84:1 | AAA | Lc 57.3 | Large or bold text, headings |
| #64B1DA text on white | 2.37:1 | Fails | Lc 46.6 | Large or bold text, headings |
| #64B1DA text on black | 8.84:1 | AAA | Lc -55.4 | 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
#C4DDEC
oklch(88.4% 0.034 234.1)
-
Step 300
300
#9AC8E2
oklch(80.9% 0.061 233.3)
-
Step 400
400 (this color)
#64B1DA
oklch(72.7% 0.097 233.5)
-
Step 500
500
#1E95C8
oklch(63.2% 0.123 233.3)
-
Step 600
600
#007DAC
oklch(55.5% 0.116 233.8)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#004864
oklch(37.8% 0.078 232.8)
-
Step 950
950
#052A3B
oklch(26.9% 0.051 233.3)
#64B1DA 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) | #9DAFDC | 0.063 |
| Deuteranopia (no green cones) | #8DA3D9 | 0.054 |
| Tritanopia (no blue cones) | #03BCBE | 0.075 |
| Achromatopsia (no color) | #A8A8A8 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #64B1DA
#64B1DA
oklch(72.7% 0.097 233.5)
- #D7966C
#D7966C
oklch(72.7% 0.097 53.5)
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 #64B1DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.059
- Turquoise Blue #06B1C4 ΔE 0.060
- Deep Sky Blue #00BFFF ΔE 0.064
- Bluegrey #85A3B2 ΔE 0.064
- Vivid Sky Blue #4CC9F0 ΔE 0.064
- Carolina Blue #8AB8FE ΔE 0.069
- Bluey Grey #89A0B0 ΔE 0.070
- Cool Steel #97A7B3 ΔE 0.072
Use #64B1DA 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.