#617BBE
Closest named color: Cool Blue (#4984B8). oklch(59.2% 0.107 267), rgb(97, 123, 190).
Aa
Black text reads best on this color (5.08:1).
About this color
#617BBE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.107 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.037 away. Black text reads best on it, at 5.08:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.08:1 |
| White text | 4.12:1 |
Values
| HEX | #617BBE |
| RGB | rgb(97, 123, 190) |
| HSL | hsl(223, 42%, 56%) |
| OKLCH | oklch(59.2% 0.107 267) |
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 #617BBE | 4.12:1 | AA large text | Lc -73.8 | Content text, not long reading |
| Black text on #617BBE | 5.08:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #617BBE text on white | 4.12:1 | AA large text | Lc 68.3 | Content text, not long reading |
| #617BBE text on black | 5.08:1 | AA | Lc -33.4 | 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 600.
-
Step 50
50
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D1D9EC
oklch(88.5% 0.028 267.5)
-
Step 300
300
#B3C0E1
oklch(80.9% 0.049 268.3)
-
Step 400
400
#8BA0D2
oklch(70.8% 0.077 266.8)
-
Step 500
500
#6E87C6
oklch(63% 0.1 267)
-
Step 600
600 (this color)
#617BBE
oklch(59.2% 0.107 267)
-
Step 700
700
#475E99
oklch(49.1% 0.099 266.7)
-
Step 800
800
#3A4D7C
oklch(42.7% 0.082 266.3)
-
Step 900
900
#324064
oklch(37.7% 0.065 267.1)
-
Step 950
950
#1D263B
oklch(27.1% 0.041 266)
#617BBE 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) | #6281C1 | 0.017 |
| Deuteranopia (no green cones) | #5879BD | 0.013 |
| Tritanopia (no blue cones) | #3A8994 | 0.095 |
| Achromatopsia (no color) | #7D7D7D | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #617BBE
#617BBE
oklch(59.2% 0.107 267)
- #997924
#997924
oklch(59.2% 0.107 87.2)
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 #617BBE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.037
- Steel Blue #4682B4 ΔE 0.039
- Off Blue #5684AE ΔE 0.042
- Windows Blue #3778BF ΔE 0.045
- Dusty Blue #5A86AD ΔE 0.046
- Faded Blue #658CBB ΔE 0.050
- Stormy Blue #507B9C ΔE 0.059
- Flat Blue #3C73A8 ΔE 0.059
Use #617BBE 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.