#677C8D
Closest named color: Grey Blue (#647D8E). oklch(57.6% 0.036 242.8), rgb(103, 124, 141).
Aa
Black text reads best on this color (4.84:1).
About this color
#677C8D is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.036 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.004 away. Black text reads best on it, at 4.84:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.84:1 |
| White text | 4.33:1 |
Values
| HEX | #677C8D |
| RGB | rgb(103, 124, 141) |
| HSL | hsl(207, 16%, 48%) |
| OKLCH | oklch(57.6% 0.036 242.8) |
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 #677C8D | 4.33:1 | AA large text | Lc -75.5 | Fine for body text |
| Black text on #677C8D | 4.84:1 | AA | Lc 34.1 | Non-text elements, placeholder text |
| #677C8D text on white | 4.33:1 | AA large text | Lc 70.0 | Content text, not long reading |
| #677C8D text on black | 4.84:1 | AA | Lc -31.6 | 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 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
#B8C2CA
oklch(80.9% 0.016 241.8)
-
Step 400
400
#93A3B0
oklch(70.7% 0.026 242.5)
-
Step 500
500
#798C9C
oklch(63.1% 0.033 243.7)
-
Step 600
600 (this color)
#677C8D
oklch(57.6% 0.036 242.8)
-
Step 700
700
#506373
oklch(49% 0.035 244)
-
Step 800
800
#42515D
oklch(42.7% 0.028 242.5)
-
Step 900
900
#38434C
oklch(37.7% 0.021 243)
-
Step 950
950
#21272D
oklch(26.9% 0.014 248.4)
#677C8D 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) | #757C8E | 0.020 |
| Deuteranopia (no green cones) | #70788D | 0.016 |
| Tritanopia (no blue cones) | #5C8081 | 0.029 |
| Achromatopsia (no color) | #797979 | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #677C8D
#677C8D
oklch(57.6% 0.036 242.8)
- #897563
#897563
oklch(57.6% 0.037 64)
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 #677C8D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.004
- Battleship Grey #6B7C85 ΔE 0.013
- Slate Gray #708090 ΔE 0.018
- Steel Grey #6F828A ΔE 0.023
- Battleship Gray #6C757D ΔE 0.027
- Steel #738595 ΔE 0.032
- Stormy Blue #507B9C ΔE 0.036
- Lavender Gray #7E7F9A ΔE 0.040
Use #677C8D 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.