#3670BF
Closest named color: Windows Blue (#3778BF). oklch(54.6% 0.138 256.9), rgb(54, 112, 191).
Aa
White text reads best on this color (4.96:1).
About this color
#3670BF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.138 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.023 away. White text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.22:1 |
| White text | 4.96:1 |
Values
| HEX | #3670BF |
| RGB | rgb(54, 112, 191) |
| HSL | hsl(215, 56%, 48%) |
| OKLCH | oklch(54.6% 0.138 256.9) |
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 #3670BF | 4.96:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #3670BF | 4.22:1 | AA large text | Lc 30.0 | Non-text elements, placeholder text |
| #3670BF text on white | 4.96:1 | AA | Lc 74.1 | Content text, not long reading |
| #3670BF text on black | 4.22:1 | AA large text | Lc -27.6 | Dividers and decoration only |
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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CBDBF0
oklch(88.6% 0.034 255.2)
-
Step 300
300
#A7C3E9
oklch(80.9% 0.062 256.1)
-
Step 400
400
#78A3DE
oklch(70.8% 0.099 256.5)
-
Step 500
500
#558AD5
oklch(63% 0.127 257.2)
-
Step 600
600 (this color)
#3670BF
oklch(54.6% 0.138 256.9)
-
Step 700
700
#2B60A8
oklch(49.1% 0.129 256.9)
-
Step 800
800
#254F88
oklch(42.8% 0.106 256.8)
-
Step 900
900
#23426D
oklch(37.8% 0.083 257)
-
Step 950
950
#152740
oklch(27.1% 0.053 256.9)
#3670BF 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) | #4B77C2 | 0.030 |
| Deuteranopia (no green cones) | #346ABD | 0.017 |
| Tritanopia (no blue cones) | #00828E | 0.107 |
| Achromatopsia (no color) | #707070 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3670BF
#3670BF
oklch(54.6% 0.138 256.9)
- #956600
#956600
oklch(54.6% 0.114 77.1)
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 #3670BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.023
- Mid Blue #276AB3 ΔE 0.028
- French Blue #436BAD ΔE 0.030
- Flat Blue #3C73A8 ΔE 0.039
- Nice Blue #107AB0 ΔE 0.044
- Muted Blue #3B719F ΔE 0.051
- Royal Blue #4169E1 ΔE 0.059
- Steel Blue #4682B4 ΔE 0.061
Use #3670BF 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.