#678BC4
Closest named color: Faded Blue (#658CBB). oklch(63.3% 0.095 259.3), rgb(103, 139, 196).
Aa
Black text reads best on this color (6.06:1).
About this color
#678BC4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.095 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.015 away. Black text reads best on it, at 6.06:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.06:1 |
| White text | 3.46:1 |
Values
| HEX | #678BC4 |
| RGB | rgb(103, 139, 196) |
| HSL | hsl(217, 44%, 59%) |
| OKLCH | oklch(63.3% 0.095 259.3) |
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 #678BC4 | 3.46:1 | AA large text | Lc -67.5 | Content text, not long reading |
| Black text on #678BC4 | 6.06:1 | AA | Lc 42.0 | Non-text elements, placeholder text |
| #678BC4 text on white | 3.46:1 | AA large text | Lc 62.1 | Content text, not long reading |
| #678BC4 text on black | 6.06:1 | AA | Lc -39.6 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#CFDAEB
oklch(88.5% 0.026 259)
-
Step 300
300
#AFC2DF
oklch(80.9% 0.046 258.8)
-
Step 400
400
#85A2D0
oklch(70.7% 0.075 259.5)
-
Step 500
500 (this color)
#678BC4
oklch(63.3% 0.095 259.3)
-
Step 600
600
#4D73B0
oklch(55.5% 0.105 259.5)
-
Step 700
700
#3E6197
oklch(49.2% 0.096 258.8)
-
Step 800
800
#344F7A
oklch(42.7% 0.079 259.4)
-
Step 900
900
#2D4263
oklch(37.7% 0.063 259.2)
-
Step 950
950
#1B273A
oklch(27.1% 0.039 259.4)
#678BC4 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) | #758FC6 | 0.022 |
| Deuteranopia (no green cones) | #6B86C3 | 0.014 |
| Tritanopia (no blue cones) | #40979F | 0.085 |
| Achromatopsia (no color) | #8A8A8A | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #678BC4
#678BC4
oklch(63.3% 0.095 259.3)
- #A98342
#A98342
oklch(63.3% 0.095 79)
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 #678BC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.015
- Dusty Blue #5A86AD ΔE 0.040
- Off Blue #5684AE ΔE 0.043
- Cool Blue #4984B8 ΔE 0.043
- Silver Lake Blue #778DA9 ΔE 0.047
- Steel Blue #4682B4 ΔE 0.051
- Blue Grey #758DA3 ΔE 0.054
- Dark Sky Blue #448EE4 ΔE 0.055
Use #678BC4 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.