#688BE4
Closest named color: Soft Blue (#6488EA). oklch(65.1% 0.139 266.4), rgb(104, 139, 228).
Aa
Black text reads best on this color (6.40:1).
About this color
#688BE4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.139 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.014 away. Black text reads best on it, at 6.40:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 6.40:1 |
| White text | 3.28:1 |
Values
| HEX | #688BE4 |
| RGB | rgb(104, 139, 228) |
| HSL | hsl(223, 70%, 65%) |
| OKLCH | oklch(65.1% 0.139 266.4) |
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 #688BE4 | 3.28:1 | AA large text | Lc -65.4 | Content text, not long reading |
| Black text on #688BE4 | 6.40:1 | AA | Lc 44.1 | Non-text elements, placeholder text |
| #688BE4 text on white | 3.28:1 | AA large text | Lc 60.0 | Large or bold text, headings |
| #688BE4 text on black | 6.40:1 | AA | Lc -41.7 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CED9F3
oklch(88.5% 0.038 267.3)
-
Step 300
300
#ACC0EE
oklch(80.9% 0.069 266.5)
-
Step 400
400
#819EE5
oklch(70.6% 0.11 266.7)
-
Step 500
500 (this color)
#688BE4
oklch(65.1% 0.139 266.4)
-
Step 600
600
#4A6DCB
oklch(55.7% 0.151 266.3)
-
Step 700
700
#3B5AB0
oklch(49.1% 0.142 266.4)
-
Step 800
800
#314A8E
oklch(42.7% 0.116 266.4)
-
Step 900
900
#2B3F71
oklch(37.8% 0.089 265.9)
-
Step 950
950
#192542
oklch(27% 0.057 265.8)
#688BE4 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) | #6694E8 | 0.023 |
| Deuteranopia (no green cones) | #5789E2 | 0.020 |
| Tritanopia (no blue cones) | #219EAC | 0.125 |
| Achromatopsia (no color) | #8E8E8E | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #688BE4
#688BE4
oklch(65.1% 0.139 266.4)
- #B38800
#B38800
oklch(65% 0.133 86.1)
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 #688BE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.014
- Cornflower Blue #6495ED ΔE 0.027
- Dark Sky Blue #448EE4 ΔE 0.034
- Chefchaouen Blue #4895EF ΔE 0.037
- Perrywinkle #8F8CE7 ΔE 0.051
- Lavender Blue #8B88F8 ΔE 0.056
- Cornflower #6A79F7 ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.063
Use #688BE4 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.