#647F97
Closest named color: Grey Blue (#647D8E). oklch(58.4% 0.048 245.6), rgb(100, 127, 151).
Aa
Black text reads best on this color (5.02:1).
About this color
#647F97 is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.048 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.014 away. Black text reads best on it, at 5.02:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 5.02:1 |
| White text | 4.17:1 |
Values
| HEX | #647F97 |
| RGB | rgb(100, 127, 151) |
| HSL | hsl(208, 20%, 49%) |
| OKLCH | oklch(58.4% 0.048 245.6) |
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 #647F97 | 4.17:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #647F97 | 5.02:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #647F97 text on white | 4.17:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #647F97 text on black | 5.02:1 | AA | Lc -32.9 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E6EAEE
oklch(93.5% 0.007 247.9)
-
Step 200
200
#D3DAE1
oklch(88.5% 0.012 248)
-
Step 300
300
#B6C2CE
oklch(80.8% 0.022 248.1)
-
Step 400
400
#8FA3B5
oklch(70.6% 0.035 245.5)
-
Step 500
500
#748DA3
oklch(63.2% 0.044 245.1)
-
Step 600
600 (this color)
#647F97
oklch(58.4% 0.048 245.6)
-
Step 700
700
#4B6479
oklch(49.2% 0.045 244.2)
-
Step 800
800
#3E5162
oklch(42.6% 0.037 245.8)
-
Step 900
900
#354350
oklch(37.6% 0.029 246.7)
-
Step 950
950
#1F272F
oklch(26.9% 0.019 248.5)
#647F97 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) | #757F98 | 0.023 |
| Deuteranopia (no green cones) | #6F7A97 | 0.019 |
| Tritanopia (no blue cones) | #548587 | 0.040 |
| Achromatopsia (no color) | #7C7C7C | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647F97
#647F97
oklch(58.4% 0.048 245.6)
- #90765D
#90765D
oklch(58.4% 0.049 65.5)
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 #647F97, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.014
- Slate Gray #708090 ΔE 0.019
- Battleship Grey #6B7C85 ΔE 0.027
- Steel Grey #6F828A ΔE 0.028
- Steel #738595 ΔE 0.028
- Stormy Blue #507B9C ΔE 0.029
- Dusty Blue #5A86AD ΔE 0.035
- Off Blue #5684AE ΔE 0.036
Use #647F97 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.