#648DD5
Closest named color: Dark Sky Blue (#448EE4). oklch(64.5% 0.118 261.1), rgb(100, 141, 213).
Aa
Black text reads best on this color (6.31:1).
About this color
#648DD5 is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.118 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.036 away. Black text reads best on it, at 6.31:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.31:1 |
| White text | 3.32:1 |
Values
| HEX | #648DD5 |
| RGB | rgb(100, 141, 213) |
| HSL | hsl(218, 57%, 61%) |
| OKLCH | oklch(64.5% 0.118 261.1) |
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 #648DD5 | 3.32:1 | AA large text | Lc -66.0 | Content text, not long reading |
| Black text on #648DD5 | 6.31:1 | AA | Lc 43.5 | Non-text elements, placeholder text |
| #648DD5 text on white | 3.32:1 | AA large text | Lc 60.5 | Content text, not long reading |
| #648DD5 text on black | 6.31:1 | AA | Lc -41.2 | 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 500.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CDDAEF
oklch(88.5% 0.032 260)
-
Step 300
300
#ACC2E7
oklch(81% 0.058 260.8)
-
Step 400
400
#80A1DA
oklch(70.6% 0.092 261.1)
-
Step 500
500 (this color)
#648DD5
oklch(64.5% 0.118 261.1)
-
Step 600
600
#4771BE
oklch(55.6% 0.129 261.5)
-
Step 700
700
#385FA3
oklch(49.1% 0.118 260.7)
-
Step 800
800
#2F4E84
oklch(42.8% 0.097 260.8)
-
Step 900
900
#2A416A
oklch(37.7% 0.076 261.3)
-
Step 950
950
#19263E
oklch(27% 0.049 262)
#648DD5 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) | #7093D8 | 0.023 |
| Deuteranopia (no green cones) | #6388D3 | 0.014 |
| Tritanopia (no blue cones) | #279DA7 | 0.106 |
| Achromatopsia (no color) | #8D8D8D | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #648DD5
#648DD5
oklch(64.5% 0.118 261.1)
- #B28529
#B28529
oklch(64.5% 0.118 81)
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 #648DD5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.036
- Soft Blue #6488EA ΔE 0.037
- Cornflower Blue #6495ED ΔE 0.038
- Faded Blue #658CBB ΔE 0.039
- Chefchaouen Blue #4895EF ΔE 0.044
- Cool Blue #4984B8 ΔE 0.058
- Dusty Blue #5A86AD ΔE 0.063
- Perrywinkle #8F8CE7 ΔE 0.063
Use #648DD5 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.