#647D9D
Closest named color: Grey Blue (#647D8E). oklch(58.2% 0.057 254.8), rgb(100, 125, 157).
Aa
Black text reads best on this color (4.96:1).
About this color
#647D9D is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.057 and its hue 255°. 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 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.96:1 |
| White text | 4.23:1 |
Values
| HEX | #647D9D |
| RGB | rgb(100, 125, 157) |
| HSL | hsl(214, 23%, 50%) |
| OKLCH | oklch(58.2% 0.057 254.8) |
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 #647D9D | 4.23:1 | AA large text | Lc -74.7 | Content text, not long reading |
| Black text on #647D9D | 4.96:1 | AA | Lc 34.9 | Non-text elements, placeholder text |
| #647D9D text on white | 4.23:1 | AA large text | Lc 69.2 | Content text, not long reading |
| #647D9D text on black | 4.96:1 | AA | Lc -32.5 | 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
#F4F6F8
oklch(97.2% 0.003 247.9)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D3DAE3
oklch(88.6% 0.015 254.6)
-
Step 300
300
#B6C2D1
oklch(80.9% 0.025 254)
-
Step 400
400
#90A2BB
oklch(70.7% 0.042 256.6)
-
Step 500
500
#748BA9
oklch(63% 0.053 255.2)
-
Step 600
600 (this color)
#647D9D
oklch(58.2% 0.057 254.8)
-
Step 700
700
#4C627F
oklch(49% 0.054 255.5)
-
Step 800
800
#3E5067
oklch(42.6% 0.045 254.8)
-
Step 900
900
#354354
oklch(37.8% 0.034 253.6)
-
Step 950
950
#1F2731
oklch(27% 0.022 254.2)
#647D9D 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) | #717E9F | 0.018 |
| Deuteranopia (no green cones) | #6B799C | 0.014 |
| Tritanopia (no blue cones) | #528488 | 0.050 |
| Achromatopsia (no color) | #7B7B7B | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647D9D
#647D9D
oklch(58.2% 0.057 254.8)
- #8F7654
#8F7654
oklch(58.1% 0.058 74.8)
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 #647D9D, 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 0.025
- Slate Gray #708090 ΔE 0.029
- Off Blue #5684AE ΔE 0.030
- Dusty Blue #5A86AD ΔE 0.031
- Cerulean #457B9D ΔE 0.036
- Steel #738595 ΔE 0.037
- Lavender Gray #7E7F9A ΔE 0.037
Use #647D9D 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.