#677BB9
Closest named color: Off Blue (#5684AE). oklch(59.3% 0.098 269.6), rgb(103, 123, 185).
Aa
Black text reads best on this color (5.11:1).
About this color
#677BB9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.098 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.039 away. Black text reads best on it, at 5.11:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 5.11:1 |
| White text | 4.10:1 |
Values
| HEX | #677BB9 |
| RGB | rgb(103, 123, 185) |
| HSL | hsl(225, 37%, 56%) |
| OKLCH | oklch(59.3% 0.098 269.6) |
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 #677BB9 | 4.10:1 | AA large text | Lc -73.7 | Content text, not long reading |
| Black text on #677BB9 | 5.11:1 | AA | Lc 35.9 | Non-text elements, placeholder text |
| #677BB9 text on white | 4.10:1 | AA large text | Lc 68.2 | Content text, not long reading |
| #677BB9 text on black | 5.11:1 | AA | Lc -33.5 | 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 600.
-
Step 50
50
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D2D9EA
oklch(88.5% 0.025 267.9)
-
Step 300
300
#B5C0DE
oklch(80.9% 0.044 269.5)
-
Step 400
400
#8F9FCD
oklch(70.7% 0.07 269.7)
-
Step 500
500
#7487C1
oklch(63.2% 0.09 269.8)
-
Step 600
600 (this color)
#677BB9
oklch(59.3% 0.098 269.6)
-
Step 700
700
#4C5D95
oklch(49% 0.092 270)
-
Step 800
800
#3E4C79
oklch(42.6% 0.077 269.8)
-
Step 900
900
#354061
oklch(37.7% 0.059 269.4)
-
Step 950
950
#1F2639
oklch(27.1% 0.037 268.4)
#677BB9 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) | #6581BC | 0.016 |
| Deuteranopia (no green cones) | #5D7AB8 | 0.013 |
| Tritanopia (no blue cones) | #4A8891 | 0.089 |
| Achromatopsia (no color) | #7D7D7D | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #677BB9
#677BB9
oklch(59.3% 0.098 269.6)
- #957B31
#957B31
oklch(59.3% 0.098 89.6)
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 #677BB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.039
- Cool Blue #4984B8 ΔE 0.039
- Steel Blue #4682B4 ΔE 0.041
- Dusty Blue #5A86AD ΔE 0.042
- Faded Blue #658CBB ΔE 0.047
- Windows Blue #3778BF ΔE 0.053
- Stormy Blue #507B9C ΔE 0.056
- Lavender Gray #7E7F9A ΔE 0.060
Use #677BB9 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.