#3660BF
Closest named color: Mid Blue (#276AB3). oklch(51.2% 0.157 263.8), rgb(54, 96, 191).
Aa
White text reads best on this color (5.86:1).
About this color
#3660BF is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.157 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.036 away. White text reads best on it, at 5.86:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.58:1 |
| White text | 5.86:1 |
Values
| HEX | #3660BF |
| RGB | rgb(54, 96, 191) |
| HSL | hsl(222, 56%, 48%) |
| OKLCH | oklch(51.2% 0.157 263.8) |
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 #3660BF | 5.86:1 | AA | Lc -84.2 | Fine for body text |
| Black text on #3660BF | 3.58:1 | AA large text | Lc 25.1 | Dividers and decoration only |
| #3660BF text on white | 5.86:1 | AA | Lc 78.9 | Fine for body text |
| #3660BF text on black | 3.58:1 | AA large text | Lc -22.9 | 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 700.
-
Step 50
50
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CBDAF6
oklch(88.6% 0.042 263)
-
Step 300
300
#A8C1F2
oklch(80.9% 0.075 263.7)
-
Step 400
400
#799FEC
oklch(70.7% 0.121 263.6)
-
Step 500
500
#5885E6
oklch(63.1% 0.154 263.8)
-
Step 600
600
#3E6CD4
oklch(55.5% 0.168 263.8)
-
Step 700
700 (this color)
#3660BF
oklch(51.2% 0.157 263.8)
-
Step 800
800
#294A95
oklch(42.8% 0.129 263.9)
-
Step 900
900
#253E77
oklch(37.6% 0.102 264.3)
-
Step 950
950
#162545
oklch(27% 0.063 263.8)
#3660BF 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) | #296BC2 | 0.029 |
| Deuteranopia (no green cones) | #005FBD | 0.030 |
| Tritanopia (no blue cones) | #007786 | 0.127 |
| Achromatopsia (no color) | #656565 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3660BF
#3660BF
oklch(51.2% 0.157 263.8)
- #836000
#836000
oklch(51.1% 0.105 83.6)
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 #3660BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.036
- French Blue #436BAD ΔE 0.047
- Warm Blue #4B57DB ΔE 0.054
- Iris #6258C4 ΔE 0.057
- Royal Blue #4169E1 ΔE 0.058
- Windows Blue #3778BF ΔE 0.066
- Dark Periwinkle #665FD1 ΔE 0.067
- Dusky Blue #475F94 ΔE 0.070
Use #3660BF 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.