#617CB5
Closest named color: Off Blue (#5684AE). oklch(59% 0.093 264.4), rgb(97, 124, 181).
Aa
Black text reads best on this color (5.05:1).
About this color
#617CB5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.093 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.030 away. Black text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 5.05:1 |
| White text | 4.15:1 |
Values
| HEX | #617CB5 |
| RGB | rgb(97, 124, 181) |
| HSL | hsl(221, 36%, 55%) |
| OKLCH | oklch(59% 0.093 264.4) |
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 #617CB5 | 4.15:1 | AA large text | Lc -74.0 | Content text, not long reading |
| Black text on #617CB5 | 5.05:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #617CB5 text on white | 4.15:1 | AA large text | Lc 68.5 | Content text, not long reading |
| #617CB5 text on black | 5.05:1 | AA | Lc -33.2 | 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 600.
-
Step 50
50
#F3F5F9
oklch(97% 0.006 264.5)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D1D9E9
oklch(88.4% 0.024 264.4)
-
Step 300
300
#B3C1DD
oklch(80.9% 0.043 264.3)
-
Step 400
400
#8CA1CB
oklch(70.8% 0.066 264)
-
Step 500
500
#6F89BE
oklch(63.1% 0.086 264)
-
Step 600
600 (this color)
#617CB5
oklch(59% 0.093 264.4)
-
Step 700
700
#485F92
oklch(49% 0.087 264.9)
-
Step 800
800
#3B4E77
oklch(42.7% 0.073 264.6)
-
Step 900
900
#324160
oklch(37.7% 0.057 264.1)
-
Step 950
950
#1E2638
oklch(27% 0.036 265.6)
#617CB5 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) | #6781B7 | 0.017 |
| Deuteranopia (no green cones) | #5E79B4 | 0.010 |
| Tritanopia (no blue cones) | #408890 | 0.084 |
| Achromatopsia (no color) | #7C7C7C | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #617CB5
#617CB5
oklch(59% 0.093 264.4)
- #977835
#977835
oklch(58.9% 0.093 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 #617CB5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.030
- Cool Blue #4984B8 ΔE 0.031
- Steel Blue #4682B4 ΔE 0.032
- Dusty Blue #5A86AD ΔE 0.034
- Faded Blue #658CBB ΔE 0.045
- Stormy Blue #507B9C ΔE 0.046
- Windows Blue #3778BF ΔE 0.048
- Cerulean #457B9D ΔE 0.051
Use #617CB5 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.