#647C94
Closest named color: Grey Blue (#647D8E). oklch(57.6% 0.047 248.6), rgb(100, 124, 148).
Aa
Black text reads best on this color (4.85:1).
About this color
#647C94 is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.047 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.011 away. Black text reads best on it, at 4.85:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.85:1 |
| White text | 4.32:1 |
Values
| HEX | #647C94 |
| RGB | rgb(100, 124, 148) |
| HSL | hsl(210, 19%, 49%) |
| OKLCH | oklch(57.6% 0.047 248.6) |
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 #647C94 | 4.32:1 | AA large text | Lc -75.4 | Fine for body text |
| Black text on #647C94 | 4.85:1 | AA | Lc 34.1 | Non-text elements, placeholder text |
| #647C94 text on white | 4.32:1 | AA large text | Lc 69.9 | Content text, not long reading |
| #647C94 text on black | 4.85:1 | AA | Lc -31.7 | 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
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D3DAE1
oklch(88.5% 0.012 248)
-
Step 300
300
#B7C2CE
oklch(80.9% 0.021 250.4)
-
Step 400
400
#91A3B5
oklch(70.7% 0.033 248.3)
-
Step 500
500
#768CA3
oklch(63.1% 0.043 249.7)
-
Step 600
600 (this color)
#647C94
oklch(57.6% 0.047 248.6)
-
Step 700
700
#4E6379
oklch(49.1% 0.044 249.9)
-
Step 800
800
#405162
oklch(42.7% 0.035 248.7)
-
Step 900
900
#364350
oklch(37.7% 0.028 248.6)
-
Step 950
950
#20272F
oklch(26.9% 0.018 251.9)
#647C94 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) | #737C95 | 0.021 |
| Deuteranopia (no green cones) | #6D7794 | 0.018 |
| Tritanopia (no blue cones) | #558184 | 0.038 |
| Achromatopsia (no color) | #797979 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647C94
#647C94
oklch(57.6% 0.047 248.6)
- #8C755C
#8C755C
oklch(57.8% 0.046 69)
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 #647C94, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.011
- Slate Gray #708090 ΔE 0.022
- Battleship Grey #6B7C85 ΔE 0.024
- Stormy Blue #507B9C ΔE 0.027
- Steel Grey #6F828A ΔE 0.031
- Steel #738595 ΔE 0.035
- Battleship Gray #6C757D ΔE 0.035
- Cerulean #457B9D ΔE 0.037
Use #647C94 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.