#687D8A
Closest named color: Grey Blue (#647D8E). oklch(57.8% 0.032 235.3), rgb(104, 125, 138).
Aa
Black text reads best on this color (4.88:1).
About this color
#687D8A is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.032 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.008 away. Black text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.032) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.88:1 |
| White text | 4.29:1 |
Values
| HEX | #687D8A |
| RGB | rgb(104, 125, 138) |
| HSL | hsl(203, 14%, 47%) |
| OKLCH | oklch(57.8% 0.032 235.3) |
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 #687D8A | 4.29:1 | AA large text | Lc -75.2 | Fine for body text |
| Black text on #687D8A | 4.88:1 | AA | Lc 34.4 | Non-text elements, placeholder text |
| #687D8A text on white | 4.29:1 | AA large text | Lc 69.7 | Content text, not long reading |
| #687D8A text on black | 4.88:1 | AA | Lc -31.9 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E7EAEC
oklch(93.5% 0.004 236.5)
-
Step 200
200
#D4DADE
oklch(88.5% 0.009 236.6)
-
Step 300
300
#B8C2C9
oklch(80.8% 0.015 238.1)
-
Step 400
400
#94A3AD
oklch(70.7% 0.022 236.9)
-
Step 500
500
#798D99
oklch(63.2% 0.029 234.3)
-
Step 600
600 (this color)
#687D8A
oklch(57.8% 0.032 235.3)
-
Step 700
700
#51646F
oklch(49.2% 0.029 233.6)
-
Step 800
800
#42515B
oklch(42.6% 0.025 237.4)
-
Step 900
900
#38434A
oklch(37.6% 0.019 235.9)
-
Step 950
950
#21272C
oklch(26.9% 0.013 243.3)
#687D8A 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) | #777C8B | 0.021 |
| Deuteranopia (no green cones) | #72788A | 0.019 |
| Tritanopia (no blue cones) | #5E8081 | 0.023 |
| Achromatopsia (no color) | #7A7A7A | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #687D8A
#687D8A
oklch(57.8% 0.032 235.3)
- #897568
#897568
oklch(57.7% 0.032 55)
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 #687D8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.008
- Battleship Grey #6B7C85 ΔE 0.008
- Slate Gray #708090 ΔE 0.017
- Steel Grey #6F828A ΔE 0.018
- Battleship Gray #6C757D ΔE 0.025
- Steel #738595 ΔE 0.031
- Medium Grey #7D7F7C ΔE 0.037
- Gray #808080 ΔE 0.039
Use #687D8A 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.