#677B9E
Closest named color: Grey Blue (#647D8E). oklch(58% 0.059 261.5), rgb(103, 123, 158).
Aa
Black text reads best on this color (4.90:1).
About this color
#677B9E is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.059 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.028 away. Black text reads best on it, at 4.90:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.90:1 |
| White text | 4.28:1 |
Values
| HEX | #677B9E |
| RGB | rgb(103, 123, 158) |
| HSL | hsl(218, 22%, 51%) |
| OKLCH | oklch(58% 0.059 261.5) |
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 #677B9E | 4.28:1 | AA large text | Lc -75.1 | Fine for body text |
| Black text on #677B9E | 4.90:1 | AA | Lc 34.5 | Non-text elements, placeholder text |
| #677B9E text on white | 4.28:1 | AA large text | Lc 69.6 | Content text, not long reading |
| #677B9E text on black | 4.90:1 | AA | Lc -32.1 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D4D9E3
oklch(88.4% 0.015 264.5)
-
Step 300
300
#B7C1D2
oklch(80.8% 0.026 261.1)
-
Step 400
400
#92A1BC
oklch(70.6% 0.043 262.2)
-
Step 500
500
#778AAB
oklch(63.1% 0.055 261.4)
-
Step 600
600 (this color)
#677B9E
oklch(58% 0.059 261.5)
-
Step 700
700
#4F6180
oklch(49% 0.055 261.1)
-
Step 800
800
#414F68
oklch(42.6% 0.045 261.8)
-
Step 900
900
#374255
oklch(37.7% 0.036 261.2)
-
Step 950
950
#202732
oklch(27.1% 0.023 259.3)
#677B9E 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) | #6F7DA0 | 0.013 |
| Deuteranopia (no green cones) | #69789D | 0.008 |
| Tritanopia (no blue cones) | #568287 | 0.052 |
| Achromatopsia (no color) | #7A7A7A | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #677B9E
#677B9E
oklch(58% 0.059 261.5)
- #8C7752
#8C7752
oklch(58% 0.058 81.3)
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 #677B9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.028
- Stormy Blue #507B9C ΔE 0.028
- Slate Gray #708090 ΔE 0.032
- Off Blue #5684AE ΔE 0.033
- Dusty Blue #5A86AD ΔE 0.034
- Lavender Gray #7E7F9A ΔE 0.036
- Cerulean #457B9D ΔE 0.039
- Battleship Grey #6B7C85 ΔE 0.040
Use #677B9E 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.