#688CDC
Closest named color: Soft Blue (#6488EA). oklch(64.9% 0.127 264.7), rgb(104, 140, 220).
Aa
Black text reads best on this color (6.37:1).
About this color
#688CDC is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.127 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.026 away. Black text reads best on it, at 6.37:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 6.37:1 |
| White text | 3.29:1 |
Values
| HEX | #688CDC |
| RGB | rgb(104, 140, 220) |
| HSL | hsl(221, 62%, 64%) |
| OKLCH | oklch(64.9% 0.127 264.7) |
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 #688CDC | 3.29:1 | AA large text | Lc -65.6 | Content text, not long reading |
| Black text on #688CDC | 6.37:1 | AA | Lc 43.9 | Non-text elements, placeholder text |
| #688CDC text on white | 3.29:1 | AA large text | Lc 60.2 | Content text, not long reading |
| #688CDC text on black | 6.37:1 | AA | Lc -41.5 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CED9F1
oklch(88.4% 0.035 266)
-
Step 300
300
#ADC1EA
oklch(81% 0.062 264.6)
-
Step 400
400
#82A0DF
oklch(70.8% 0.099 264.5)
-
Step 500
500 (this color)
#688CDC
oklch(64.9% 0.127 264.7)
-
Step 600
600
#4A6FC3
oklch(55.6% 0.137 264.5)
-
Step 700
700
#3C5CA9
oklch(49.1% 0.129 265)
-
Step 800
800
#314C89
oklch(42.8% 0.106 264.4)
-
Step 900
900
#2B406D
oklch(37.7% 0.082 264)
-
Step 950
950
#1A2640
oklch(27.2% 0.051 264.4)
#688CDC 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) | #6C93DF | 0.020 |
| Deuteranopia (no green cones) | #5F89DA | 0.014 |
| Tritanopia (no blue cones) | #2D9DAA | 0.113 |
| Achromatopsia (no color) | #8E8E8E | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #688CDC
#688CDC
oklch(64.9% 0.127 264.7)
- #B28718
#B28718
oklch(64.8% 0.127 84.6)
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 #688CDC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.026
- Cornflower Blue #6495ED ΔE 0.031
- Dark Sky Blue #448EE4 ΔE 0.035
- Chefchaouen Blue #4895EF ΔE 0.041
- Faded Blue #658CBB ΔE 0.051
- Perrywinkle #8F8CE7 ΔE 0.054
- Lavender Blue #8B88F8 ΔE 0.064
- Cool Blue #4984B8 ΔE 0.068
Use #688CDC 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.