#607BCB
Closest named color: Windows Blue (#3778BF). oklch(59.9% 0.126 268.4), rgb(96, 123, 203).
Aa
Black text reads best on this color (5.19:1).
About this color
#607BCB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.126 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.048 away. Black text reads best on it, at 5.19:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.19:1 |
| White text | 4.04:1 |
Values
| HEX | #607BCB |
| RGB | rgb(96, 123, 203) |
| HSL | hsl(225, 51%, 59%) |
| OKLCH | oklch(59.9% 0.126 268.4) |
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 #607BCB | 4.04:1 | AA large text | Lc -73.0 | Content text, not long reading |
| Black text on #607BCB | 5.19:1 | AA | Lc 36.5 | Non-text elements, placeholder text |
| #607BCB text on white | 4.04:1 | AA large text | Lc 67.5 | Content text, not long reading |
| #607BCB text on black | 5.19:1 | AA | Lc -34.1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#CFD9F1
oklch(88.5% 0.035 267.6)
-
Step 300
300
#B0C0EA
oklch(81% 0.062 268.6)
-
Step 400
400
#869EDF
oklch(70.6% 0.099 268.3)
-
Step 500
500 (this color)
#607BCB
oklch(59.9% 0.126 268.4)
-
Step 600
600
#526DC3
oklch(55.6% 0.137 268.6)
-
Step 700
700
#425BA8
oklch(49.1% 0.127 268)
-
Step 800
800
#374A88
oklch(42.6% 0.105 268.8)
-
Step 900
900
#2F3F6D
oklch(37.8% 0.082 267.9)
-
Step 950
950
#1C2540
oklch(27.1% 0.052 268.8)
#607BCB 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) | #5B83CE | 0.021 |
| Deuteranopia (no green cones) | #4F7AC9 | 0.020 |
| Tritanopia (no blue cones) | #2C8C99 | 0.113 |
| Achromatopsia (no color) | #7E7E7E | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #607BCB
#607BCB
oklch(59.9% 0.126 268.4)
- #9E7A00
#9E7A00
oklch(59.8% 0.122 87.9)
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 #607BCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.048
- Cool Blue #4984B8 ΔE 0.049
- Steel Blue #4682B4 ΔE 0.053
- Soft Blue #6488EA ΔE 0.054
- Off Blue #5684AE ΔE 0.058
- Dark Sky Blue #448EE4 ΔE 0.059
- Faded Blue #658CBB ΔE 0.059
- Water Blue #0E87CC ΔE 0.061
Use #607BCB 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.