#647AB0
Closest named color: Off Blue (#5684AE). oklch(58.5% 0.087 266.8), rgb(100, 122, 176).
Aa
Black text reads best on this color (4.95:1).
About this color
#647AB0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.087 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.032 away. Black text reads best on it, at 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 4.95:1 |
| White text | 4.24:1 |
Values
| HEX | #647AB0 |
| RGB | rgb(100, 122, 176) |
| HSL | hsl(223, 32%, 54%) |
| OKLCH | oklch(58.5% 0.087 266.8) |
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 #647AB0 | 4.24:1 | AA large text | Lc -74.7 | Content text, not long reading |
| Black text on #647AB0 | 4.95:1 | AA | Lc 34.9 | Non-text elements, placeholder text |
| #647AB0 text on white | 4.24:1 | AA large text | Lc 69.2 | Content text, not long reading |
| #647AB0 text on black | 4.95:1 | AA | Lc -32.4 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E8
oklch(88.4% 0.022 265.8)
-
Step 300
300
#B5C1DB
oklch(81% 0.039 265.8)
-
Step 400
400
#8FA0C9
oklch(70.7% 0.063 267.2)
-
Step 500
500
#7388BB
oklch(63% 0.081 266.9)
-
Step 600
600 (this color)
#647AB0
oklch(58.5% 0.087 266.8)
-
Step 700
700
#4C5F8F
oklch(49.1% 0.081 267)
-
Step 800
800
#3E4E74
oklch(42.8% 0.067 266.2)
-
Step 900
900
#35415E
oklch(37.8% 0.052 266.7)
-
Step 950
950
#1F2637
oklch(27% 0.033 266.9)
#647AB0 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) | #677FB2 | 0.015 |
| Deuteranopia (no green cones) | #5F78AF | 0.009 |
| Tritanopia (no blue cones) | #49858D | 0.078 |
| Achromatopsia (no color) | #7B7B7B | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647AB0
#647AB0
oklch(58.5% 0.087 266.8)
- #92783A
#92783A
oklch(58.4% 0.087 86.7)
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 #647AB0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.032
- Steel Blue #4682B4 ΔE 0.036
- Dusty Blue #5A86AD ΔE 0.037
- Cool Blue #4984B8 ΔE 0.037
- Stormy Blue #507B9C ΔE 0.042
- Dull Blue #49759C ΔE 0.048
- Cerulean #457B9D ΔE 0.049
- Faded Blue #658CBB ΔE 0.050
Use #647AB0 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.