#688FEF
Closest named color: Cornflower Blue (#6495ED). oklch(66.5% 0.149 265.8), rgb(104, 143, 239).
Aa
Black text reads best on this color (6.76:1).
About this color
#688FEF is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.149 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.017 away. Black text reads best on it, at 6.76:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 6.76:1 |
| White text | 3.10:1 |
Values
| HEX | #688FEF |
| RGB | rgb(104, 143, 239) |
| HSL | hsl(223, 81%, 67%) |
| OKLCH | oklch(66.5% 0.149 265.8) |
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 #688FEF | 3.10:1 | AA large text | Lc -63.2 | Content text, not long reading |
| Black text on #688FEF | 6.76:1 | AA | Lc 46.2 | Large or bold text, headings |
| #688FEF text on white | 3.10:1 | AA large text | Lc 57.8 | Large or bold text, headings |
| #688FEF text on black | 6.76:1 | AA | Lc -43.9 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F5
oklch(88.4% 0.041 265.7)
-
Step 300
300
#AAC0F1
oklch(80.8% 0.074 265.9)
-
Step 400
400
#7E9EEA
oklch(70.7% 0.118 266.1)
-
Step 500
500 (this color)
#688FEF
oklch(66.5% 0.149 265.8)
-
Step 600
600
#456CD1
oklch(55.6% 0.162 265.5)
-
Step 700
700
#3759B5
oklch(49% 0.151 265.8)
-
Step 800
800
#2E4993
oklch(42.6% 0.126 266.1)
-
Step 900
900
#293E75
oklch(37.7% 0.098 266.1)
-
Step 950
950
#182544
oklch(27% 0.061 265.4)
#688FEF 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) | #6699F3 | 0.026 |
| Deuteranopia (no green cones) | #558DED | 0.022 |
| Tritanopia (no blue cones) | #00A4B3 | 0.134 |
| Achromatopsia (no color) | #929292 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #688FEF
#688FEF
oklch(66.5% 0.149 265.8)
- #B98C00
#B98C00
oklch(66.5% 0.136 85.7)
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 #688FEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.017
- Soft Blue #6488EA ΔE 0.020
- Chefchaouen Blue #4895EF ΔE 0.032
- Dark Sky Blue #448EE4 ΔE 0.040
- Lavender Blue #8B88F8 ΔE 0.049
- Perrywinkle #8F8CE7 ΔE 0.050
- Dodger Blue #1E90FF ΔE 0.057
- Cornflower #6A79F7 ΔE 0.058
Use #688FEF 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.