#6581BC
Closest named color: Off Blue (#5684AE). oklch(60.6% 0.096 264.3), rgb(101, 129, 188).
Aa
Black text reads best on this color (5.41:1).
About this color
#6581BC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.096 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.031 away. Black text reads best on it, at 5.41:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 5.41:1 |
| White text | 3.87:1 |
Values
| HEX | #6581BC |
| RGB | rgb(101, 129, 188) |
| HSL | hsl(221, 39%, 57%) |
| OKLCH | oklch(60.6% 0.096 264.3) |
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 #6581BC | 3.87:1 | AA large text | Lc -71.6 | Content text, not long reading |
| Black text on #6581BC | 5.41:1 | AA | Lc 38.0 | Non-text elements, placeholder text |
| #6581BC text on white | 3.87:1 | AA large text | Lc 66.1 | Content text, not long reading |
| #6581BC text on black | 5.41:1 | AA | Lc -35.5 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D1D9EB
oklch(88.5% 0.026 266.6)
-
Step 300
300
#B2C1E0
oklch(81% 0.047 264.9)
-
Step 400
400
#89A0D0
oklch(70.6% 0.075 264.7)
-
Step 500
500 (this color)
#6581BC
oklch(60.6% 0.096 264.3)
-
Step 600
600
#5471B0
oklch(55.5% 0.104 264.5)
-
Step 700
700
#455F98
oklch(49.2% 0.097 264.5)
-
Step 800
800
#384E7B
oklch(42.8% 0.08 263.6)
-
Step 900
900
#314163
oklch(37.8% 0.062 264.4)
-
Step 950
950
#1D263A
oklch(27% 0.04 265.3)
#6581BC 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) | #6B86BF | 0.017 |
| Deuteranopia (no green cones) | #627EBB | 0.010 |
| Tritanopia (no blue cones) | #438D96 | 0.085 |
| Achromatopsia (no color) | #818181 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6581BC
#6581BC
oklch(60.6% 0.096 264.3)
- #9D7D38
#9D7D38
oklch(60.6% 0.096 84.2)
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 #6581BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.031
- Faded Blue #658CBB ΔE 0.032
- Cool Blue #4984B8 ΔE 0.032
- Dusty Blue #5A86AD ΔE 0.033
- Steel Blue #4682B4 ΔE 0.037
- Silver Lake Blue #778DA9 ΔE 0.057
- Windows Blue #3778BF ΔE 0.057
- Stormy Blue #507B9C ΔE 0.058
Use #6581BC 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.