#688FDC
Closest named color: Cornflower Blue (#6495ED). oklch(65.5% 0.124 263), rgb(104, 143, 220).
Aa
Black text reads best on this color (6.55:1).
About this color
#688FDC is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.124 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.027 away. Black text reads best on it, at 6.55:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 6.55:1 |
| White text | 3.20:1 |
Values
| HEX | #688FDC |
| RGB | rgb(104, 143, 220) |
| HSL | hsl(220, 62%, 64%) |
| OKLCH | oklch(65.5% 0.124 263) |
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 #688FDC | 3.20:1 | AA large text | Lc -64.5 | Content text, not long reading |
| Black text on #688FDC | 6.55:1 | AA | Lc 44.9 | Non-text elements, placeholder text |
| #688FDC text on white | 3.20:1 | AA large text | Lc 59.1 | Large or bold text, headings |
| #688FDC text on black | 6.55:1 | AA | Lc -42.6 | 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
#F3F6FB
oklch(97.2% 0.007 260.7)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CEDAF0
oklch(88.6% 0.033 262.7)
-
Step 300
300
#ACC1E9
oklch(80.9% 0.061 263.2)
-
Step 400
400
#81A0DD
oklch(70.6% 0.096 263.4)
-
Step 500
500 (this color)
#688FDC
oklch(65.5% 0.124 263)
-
Step 600
600
#4870C1
oklch(55.6% 0.134 263)
-
Step 700
700
#3A5DA7
oklch(49.1% 0.125 263.4)
-
Step 800
800
#304D87
oklch(42.8% 0.103 262.8)
-
Step 900
900
#2A406C
oklch(37.6% 0.081 263)
-
Step 950
950
#19263F
oklch(27% 0.05 262.6)
#688FDC 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) | #7196DF | 0.023 |
| Deuteranopia (no green cones) | #638BDA | 0.013 |
| Tritanopia (no blue cones) | #2CA0AB | 0.111 |
| Achromatopsia (no color) | #909090 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #688FDC
#688FDC
oklch(65.5% 0.124 263)
- #B58923
#B58923
oklch(65.6% 0.124 83.3)
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 #688FDC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.027
- Soft Blue #6488EA ΔE 0.031
- Dark Sky Blue #448EE4 ΔE 0.036
- Chefchaouen Blue #4895EF ΔE 0.039
- Faded Blue #658CBB ΔE 0.050
- Perrywinkle #8F8CE7 ΔE 0.054
- Lavender Blue #8B88F8 ΔE 0.066
- Cool Blue #4984B8 ΔE 0.070
Use #688FDC 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.