#617BBB
Closest named color: Cool Blue (#4984B8). oklch(59% 0.103 266.5), rgb(97, 123, 187).
Aa
Black text reads best on this color (5.05:1).
About this color
#617BBB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.103 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.035 away. Black text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.05:1 |
| White text | 4.15:1 |
Values
| HEX | #617BBB |
| RGB | rgb(97, 123, 187) |
| HSL | hsl(223, 40%, 56%) |
| OKLCH | oklch(59% 0.103 266.5) |
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 #617BBB | 4.15:1 | AA large text | Lc -74.0 | Content text, not long reading |
| Black text on #617BBB | 5.05:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #617BBB text on white | 4.15:1 | AA large text | Lc 68.5 | Content text, not long reading |
| #617BBB 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D1D9EB
oklch(88.5% 0.026 266.6)
-
Step 300
300
#B3C1E0
oklch(81% 0.046 266.1)
-
Step 400
400
#8BA0D0
oklch(70.7% 0.075 266.2)
-
Step 500
500
#6F88C3
oklch(63.2% 0.094 266.2)
-
Step 600
600 (this color)
#617BBB
oklch(59% 0.103 266.5)
-
Step 700
700
#475E97
oklch(49% 0.096 266.3)
-
Step 800
800
#3B4D7B
oklch(42.7% 0.08 266.8)
-
Step 900
900
#324063
oklch(37.6% 0.063 266.8)
-
Step 950
950
#1E263A
oklch(27.1% 0.039 267.1)
#617BBB 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) | #6381BE | 0.017 |
| Deuteranopia (no green cones) | #5A79BA | 0.011 |
| Tritanopia (no blue cones) | #3D8992 | 0.093 |
| Achromatopsia (no color) | #7C7C7C | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #617BBB
#617BBB
oklch(59% 0.103 266.5)
- #987929
#987929
oklch(59.1% 0.103 87)
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 #617BBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.035
- Steel Blue #4682B4 ΔE 0.037
- Off Blue #5684AE ΔE 0.038
- Dusty Blue #5A86AD ΔE 0.043
- Windows Blue #3778BF ΔE 0.045
- Faded Blue #658CBB ΔE 0.049
- Stormy Blue #507B9C ΔE 0.055
- Flat Blue #3C73A8 ΔE 0.057
Use #617BBB 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.