#647EA1
Closest named color: Off Blue (#5684AE). oklch(58.6% 0.062 256), rgb(100, 126, 161).
Aa
Black text reads best on this color (5.04:1).
About this color
#647EA1 is a medium-dark, muted blue. In OKLCH its lightness is 59%, its chroma 0.062 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.025 away. Black text reads best on it, at 5.04:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 5.04:1 |
| White text | 4.16:1 |
Values
| HEX | #647EA1 |
| RGB | rgb(100, 126, 161) |
| HSL | hsl(214, 24%, 51%) |
| OKLCH | oklch(58.6% 0.062 256) |
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 #647EA1 | 4.16:1 | AA large text | Lc -74.2 | Content text, not long reading |
| Black text on #647EA1 | 5.04:1 | AA | Lc 35.4 | Non-text elements, placeholder text |
| #647EA1 text on white | 4.16:1 | AA large text | Lc 68.7 | Content text, not long reading |
| #647EA1 text on black | 5.04:1 | AA | Lc -33.0 | 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
#B5C2D3
oklch(80.9% 0.028 255.1)
-
Step 400
400
#8FA2BD
oklch(70.7% 0.045 257.2)
-
Step 500
500
#738BAC
oklch(63% 0.057 256.4)
-
Step 600
600 (this color)
#647EA1
oklch(58.6% 0.062 256)
-
Step 700
700
#4B6281
oklch(49% 0.057 256)
-
Step 800
800
#3E5069
oklch(42.7% 0.048 256.7)
-
Step 900
900
#354355
oklch(37.8% 0.036 254.9)
-
Step 950
950
#1F2732
oklch(27% 0.024 256.4)
#647EA1 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) | #717FA3 | 0.018 |
| Deuteranopia (no green cones) | #6A79A0 | 0.015 |
| Tritanopia (no blue cones) | #50868A | 0.055 |
| Achromatopsia (no color) | #7C7C7C | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647EA1
#647EA1
oklch(58.6% 0.062 256)
- #927752
#927752
oklch(58.6% 0.062 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 #647EA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.025
- Dusty Blue #5A86AD ΔE 0.026
- Stormy Blue #507B9C ΔE 0.028
- Grey Blue #647D8E ΔE 0.029
- Slate Gray #708090 ΔE 0.032
- Lavender Gray #7E7F9A ΔE 0.037
- Steel #738595 ΔE 0.038
- Cerulean #457B9D ΔE 0.038
Use #647EA1 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.