#648FBB
Closest named color: Faded Blue (#658CBB). oklch(63.6% 0.082 249.8), rgb(100, 143, 187).
Aa
Black text reads best on this color (6.18:1).
About this color
#648FBB is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.082 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.008 away. Black text reads best on it, at 6.18:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.18:1 |
| White text | 3.39:1 |
Values
| HEX | #648FBB |
| RGB | rgb(100, 143, 187) |
| HSL | hsl(210, 39%, 56%) |
| OKLCH | oklch(63.6% 0.082 249.8) |
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 #648FBB | 3.39:1 | AA large text | Lc -66.8 | Content text, not long reading |
| Black text on #648FBB | 6.18:1 | AA | Lc 42.7 | Non-text elements, placeholder text |
| #648FBB text on white | 3.39:1 | AA large text | Lc 61.3 | Content text, not long reading |
| #648FBB text on black | 6.18:1 | AA | Lc -40.4 | 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 500.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CEDBE8
oklch(88.6% 0.023 248.1)
-
Step 300
300
#AEC3DA
oklch(80.9% 0.04 250.7)
-
Step 400
400
#82A4C7
oklch(70.6% 0.064 249.5)
-
Step 500
500 (this color)
#648FBB
oklch(63.6% 0.082 249.8)
-
Step 600
600
#4977A5
oklch(55.6% 0.088 249.7)
-
Step 700
700
#3A648E
oklch(49.2% 0.083 249.8)
-
Step 800
800
#305273
oklch(42.8% 0.068 249)
-
Step 900
900
#2B445D
oklch(37.8% 0.053 249.4)
-
Step 950
950
#192836
oklch(27% 0.033 247.4)
#648FBB 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) | #7D90BD | 0.031 |
| Deuteranopia (no green cones) | #7387BA | 0.027 |
| Tritanopia (no blue cones) | #3F999E | 0.070 |
| Achromatopsia (no color) | #8B8B8B | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #648FBB
#648FBB
oklch(63.6% 0.082 249.8)
- #AB8252
#AB8252
oklch(63.6% 0.082 69.8)
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 #648FBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.008
- Silver Lake Blue #778DA9 ΔE 0.033
- Dusty Blue #5A86AD ΔE 0.033
- Blue Grey #758DA3 ΔE 0.039
- Off Blue #5684AE ΔE 0.039
- Cool Blue #4984B8 ΔE 0.045
- Steel Blue #4682B4 ΔE 0.052
- Light Slate Gray #778899 ΔE 0.052
Use #648FBB 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.