#677D91
Closest named color: Grey Blue (#647D8E). oklch(58% 0.04 246), rgb(103, 125, 145).
Aa
Black text reads best on this color (4.91:1).
About this color
#677D91 is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.040 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.006 away. Black text reads best on it, at 4.91:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.91:1 |
| White text | 4.26:1 |
Values
| HEX | #677D91 |
| RGB | rgb(103, 125, 145) |
| HSL | hsl(209, 17%, 49%) |
| OKLCH | oklch(58% 0.04 246) |
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 #677D91 | 4.26:1 | AA large text | Lc -75.0 | Content text, not long reading |
| Black text on #677D91 | 4.91:1 | AA | Lc 34.6 | Non-text elements, placeholder text |
| #677D91 text on white | 4.26:1 | AA large text | Lc 69.5 | Content text, not long reading |
| #677D91 text on black | 4.91:1 | AA | Lc -32.2 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D4DADF
oklch(88.5% 0.009 242.9)
-
Step 300
300
#B7C2CC
oklch(80.9% 0.019 245.4)
-
Step 400
400
#92A3B2
oklch(70.7% 0.029 244.8)
-
Step 500
500
#788C9F
oklch(63.1% 0.037 247)
-
Step 600
600 (this color)
#677D91
oklch(58% 0.04 246)
-
Step 700
700
#4F6375
oklch(49% 0.038 245.8)
-
Step 800
800
#41515F
oklch(42.7% 0.031 245)
-
Step 900
900
#37434E
oklch(37.7% 0.025 246.2)
-
Step 950
950
#20272E
oklch(26.9% 0.016 248.4)
#677D91 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) | #757D92 | 0.019 |
| Deuteranopia (no green cones) | #707891 | 0.018 |
| Tritanopia (no blue cones) | #5B8283 | 0.034 |
| Achromatopsia (no color) | #7A7A7A | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #677D91
#677D91
oklch(58% 0.04 246)
- #8B7661
#8B7661
oklch(58% 0.04 66.9)
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 #677D91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.006
- Slate Gray #708090 ΔE 0.016
- Battleship Grey #6B7C85 ΔE 0.018
- Steel Grey #6F828A ΔE 0.024
- Steel #738595 ΔE 0.029
- Battleship Gray #6C757D ΔE 0.032
- Stormy Blue #507B9C ΔE 0.033
- Lavender Gray #7E7F9A ΔE 0.037
Use #677D91 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.