#677F9F
Closest named color: Slate Gray (#708090). oklch(59% 0.057 255.7), rgb(103, 127, 159).
Aa
Black text reads best on this color (5.11:1).
About this color
#677F9F is a medium-dark, muted blue. In OKLCH its lightness is 59%, its chroma 0.057 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Slate Gray (#708090), ΔE 0.026 away. Black text reads best on it, at 5.11:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Slate Gray (#708090) |
| Black text | 5.11:1 |
| White text | 4.10:1 |
Values
| HEX | #677F9F |
| RGB | rgb(103, 127, 159) |
| HSL | hsl(214, 23%, 51%) |
| OKLCH | oklch(59% 0.057 255.7) |
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 #677F9F | 4.10:1 | AA large text | Lc -73.7 | Content text, not long reading |
| Black text on #677F9F | 5.11:1 | AA | Lc 35.9 | Non-text elements, placeholder text |
| #677F9F text on white | 4.10:1 | AA large text | Lc 68.2 | Content text, not long reading |
| #677F9F text on black | 5.11:1 | AA | Lc -33.5 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D3DAE3
oklch(88.6% 0.015 254.6)
-
Step 300
300
#B6C2D1
oklch(80.9% 0.025 254)
-
Step 400
400
#90A2BA
oklch(70.6% 0.041 255.7)
-
Step 500
500
#758BA9
oklch(63% 0.052 256.2)
-
Step 600
600 (this color)
#677F9F
oklch(59% 0.057 255.7)
-
Step 700
700
#4D627F
oklch(49.1% 0.053 256.6)
-
Step 800
800
#3F5067
oklch(42.7% 0.044 256.1)
-
Step 900
900
#364354
oklch(37.9% 0.034 255.3)
-
Step 950
950
#202731
oklch(27% 0.021 257.3)
#677F9F 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) | #7380A1 | 0.017 |
| Deuteranopia (no green cones) | #6D7B9E | 0.013 |
| Tritanopia (no blue cones) | #56868A | 0.049 |
| Achromatopsia (no color) | #7D7D7D | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #677F9F
#677F9F
oklch(59% 0.057 255.7)
- #917957
#917957
oklch(59% 0.057 75.9)
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 #677F9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate Gray #708090 ΔE 0.026
- Grey Blue #647D8E ΔE 0.027
- Dusty Blue #5A86AD ΔE 0.027
- Off Blue #5684AE ΔE 0.028
- Steel #738595 ΔE 0.031
- Stormy Blue #507B9C ΔE 0.032
- Lavender Gray #7E7F9A ΔE 0.032
- Steel Grey #6F828A ΔE 0.037
Use #677F9F 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.