#677999
Closest named color: Grey Blue (#647D8E). oklch(57.4% 0.054 261.8), rgb(103, 121, 153).
Aa
Black text reads best on this color (4.77:1).
About this color
#677999 is a medium-dark, muted blue. In OKLCH its lightness is 57%, its chroma 0.054 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.024 away. Black text reads best on it, at 4.77:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.77:1 |
| White text | 4.40:1 |
Values
| HEX | #677999 |
| RGB | rgb(103, 121, 153) |
| HSL | hsl(218, 20%, 50%) |
| OKLCH | oklch(57.4% 0.054 261.8) |
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 #677999 | 4.40:1 | AA large text | Lc -76.0 | Fine for body text |
| Black text on #677999 | 4.77:1 | AA | Lc 33.6 | Non-text elements, placeholder text |
| #677999 text on white | 4.40:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #677999 text on black | 4.77:1 | AA | Lc -31.2 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D4D9E2
oklch(88.4% 0.013 262.4)
-
Step 300
300
#B8C1D1
oklch(80.9% 0.025 262.1)
-
Step 400
400
#93A1BA
oklch(70.6% 0.04 262.1)
-
Step 500
500
#798AA8
oklch(63.1% 0.049 261.7)
-
Step 600
600 (this color)
#677999
oklch(57.4% 0.054 261.8)
-
Step 700
700
#51617E
oklch(49.1% 0.051 262.1)
-
Step 800
800
#424F66
oklch(42.6% 0.042 261.7)
-
Step 900
900
#384253
oklch(37.7% 0.032 261)
-
Step 950
950
#212731
oklch(27.1% 0.021 260.6)
#677999 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) | #6E7B9A | 0.012 |
| Deuteranopia (no green cones) | #697698 | 0.008 |
| Tritanopia (no blue cones) | #588084 | 0.049 |
| Achromatopsia (no color) | #787878 | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #677999
#677999
oklch(57.4% 0.054 261.8)
- #897654
#897654
oklch(57.5% 0.054 81.8)
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 #677999, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.024
- Stormy Blue #507B9C ΔE 0.028
- Slate Gray #708090 ΔE 0.031
- Battleship Grey #6B7C85 ΔE 0.035
- Lavender Gray #7E7F9A ΔE 0.038
- Cerulean #457B9D ΔE 0.039
- Dull Blue #49759C ΔE 0.040
- Metallic Blue #4F738E ΔE 0.040
Use #677999 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.