#647B97
Closest named color: Grey Blue (#647D8E). oklch(57.5% 0.051 253.6), rgb(100, 123, 151).
Aa
Black text reads best on this color (4.82:1).
About this color
#647B97 is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.051 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.017 away. Black text reads best on it, at 4.82:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.82:1 |
| White text | 4.35:1 |
Values
| HEX | #647B97 |
| RGB | rgb(100, 123, 151) |
| HSL | hsl(213, 20%, 49%) |
| OKLCH | oklch(57.5% 0.051 253.6) |
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 #647B97 | 4.35:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #647B97 | 4.82:1 | AA | Lc 33.9 | Non-text elements, placeholder text |
| #647B97 text on white | 4.35:1 | AA large text | Lc 70.2 | Content text, not long reading |
| #647B97 text on black | 4.82:1 | AA | Lc -31.5 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D3DAE2
oklch(88.5% 0.013 251.6)
-
Step 300
300
#B7C2D0
oklch(81% 0.023 254.4)
-
Step 400
400
#91A2B8
oklch(70.6% 0.038 254.9)
-
Step 500
500
#768CA6
oklch(63.2% 0.047 252.8)
-
Step 600
600 (this color)
#647B97
oklch(57.5% 0.051 253.6)
-
Step 700
700
#4E627C
oklch(49% 0.049 255.2)
-
Step 800
800
#405064
oklch(42.6% 0.039 254.2)
-
Step 900
900
#364352
oklch(37.8% 0.031 252.3)
-
Step 950
950
#202730
oklch(27% 0.02 254.8)
#647B97 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) | #717C98 | 0.018 |
| Deuteranopia (no green cones) | #6B7796 | 0.014 |
| Tritanopia (no blue cones) | #548184 | 0.045 |
| Achromatopsia (no color) | #797979 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647B97
#647B97
oklch(57.5% 0.051 253.6)
- #8B7557
#8B7557
oklch(57.5% 0.051 75.1)
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 #647B97, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.017
- Stormy Blue #507B9C ΔE 0.024
- Slate Gray #708090 ΔE 0.027
- Battleship Grey #6B7C85 ΔE 0.030
- Cerulean #457B9D ΔE 0.036
- Steel Grey #6F828A ΔE 0.036
- Steel #738595 ΔE 0.038
- Off Blue #5684AE ΔE 0.039
Use #647B97 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.