#647DA1
Closest named color: Off Blue (#5684AE). oklch(58.4% 0.063 257.5), rgb(100, 125, 161).
Aa
Black text reads best on this color (4.98:1).
About this color
#647DA1 is a medium-dark, muted blue. In OKLCH its lightness is 58%, its chroma 0.063 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.027 away. Black text reads best on it, at 4.98:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 4.98:1 |
| White text | 4.20:1 |
Values
| HEX | #647DA1 |
| RGB | rgb(100, 125, 161) |
| HSL | hsl(215, 24%, 51%) |
| OKLCH | oklch(58.4% 0.063 257.5) |
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 #647DA1 | 4.20:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #647DA1 | 4.98:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #647DA1 text on white | 4.20:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #647DA1 text on black | 4.98:1 | AA | Lc -32.7 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D3DAE4
oklch(88.6% 0.016 257.2)
-
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
#748BAD
oklch(63.1% 0.058 258)
-
Step 600
600 (this color)
#647DA1
oklch(58.4% 0.063 257.5)
-
Step 700
700
#4C6282
oklch(49.2% 0.058 257.7)
-
Step 800
800
#3E506A
oklch(42.7% 0.049 257.5)
-
Step 900
900
#354256
oklch(37.6% 0.038 258.9)
-
Step 950
950
#1F2732
oklch(27% 0.024 256.4)
#647DA1 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) | #707FA3 | 0.018 |
| Deuteranopia (no green cones) | #6979A0 | 0.012 |
| Tritanopia (no blue cones) | #508589 | 0.056 |
| Achromatopsia (no color) | #7B7B7B | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #647DA1
#647DA1
oklch(58.4% 0.063 257.5)
- #917750
#917750
oklch(58.5% 0.063 77.1)
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 #647DA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.027
- Stormy Blue #507B9C ΔE 0.027
- Dusty Blue #5A86AD ΔE 0.028
- Grey Blue #647D8E ΔE 0.030
- Slate Gray #708090 ΔE 0.034
- Cerulean #457B9D ΔE 0.037
- Lavender Gray #7E7F9A ΔE 0.038
- Steel #738595 ΔE 0.040
Use #647DA1 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.