#677B91
Closest named color: Grey Blue (#647D8E). oklch(57.5% 0.041 251), rgb(103, 123, 145).
Aa
Black text reads best on this color (4.81:1).
About this color
#677B91 is a medium-dark, muted blue. In OKLCH its lightness is 57%, its chroma 0.041 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.009 away. Black text reads best on it, at 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.81:1 |
| White text | 4.35:1 |
Values
| HEX | #677B91 |
| RGB | rgb(103, 123, 145) |
| HSL | hsl(211, 17%, 49%) |
| OKLCH | oklch(57.5% 0.041 251) |
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 #677B91 | 4.35:1 | AA large text | Lc -75.7 | Fine for body text |
| Black text on #677B91 | 4.81:1 | AA | Lc 33.9 | Non-text elements, placeholder text |
| #677B91 text on white | 4.35:1 | AA large text | Lc 70.2 | Content text, not long reading |
| #677B91 text on black | 4.81:1 | AA | Lc -31.5 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D4DAE0
oklch(88.6% 0.011 247.9)
-
Step 300
300
#B8C2CD
oklch(81% 0.019 250.6)
-
Step 400
400
#93A2B3
oklch(70.6% 0.03 251.6)
-
Step 500
500
#798CA0
oklch(63.2% 0.037 249.8)
-
Step 600
600 (this color)
#677B91
oklch(57.5% 0.041 251)
-
Step 700
700
#516376
oklch(49.2% 0.038 250)
-
Step 800
800
#425060
oklch(42.6% 0.032 252)
-
Step 900
900
#38434F
oklch(37.8% 0.025 250.7)
-
Step 950
950
#21272E
oklch(27% 0.016 252.4)
#677B91 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) | #737B92 | 0.017 |
| Deuteranopia (no green cones) | #6E7791 | 0.014 |
| Tritanopia (no blue cones) | #5B8082 | 0.036 |
| Achromatopsia (no color) | #797979 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #677B91
#677B91
oklch(57.5% 0.041 251)
- #89755E
#89755E
oklch(57.5% 0.042 70.7)
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 #677B91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.009
- Battleship Grey #6B7C85 ΔE 0.020
- Slate Gray #708090 ΔE 0.021
- Steel Grey #6F828A ΔE 0.029
- Battleship Gray #6C757D ΔE 0.031
- Stormy Blue #507B9C ΔE 0.031
- Steel #738595 ΔE 0.034
- Lavender Gray #7E7F9A ΔE 0.038
Use #677B91 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.