#366CC8
Closest named color: Mid Blue (#276AB3). oklch(54.4% 0.154 260.3), rgb(54, 108, 200).
Aa
White text reads best on this color (5.07:1).
About this color
#366CC8 is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.154 and its hue 260°. 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 5.07:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.13:1 |
| White text | 5.07:1 |
Values
| HEX | #366CC8 |
| RGB | rgb(54, 108, 200) |
| HSL | hsl(218, 57%, 50%) |
| OKLCH | oklch(54.4% 0.154 260.3) |
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 #366CC8 | 5.07:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #366CC8 | 4.13:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #366CC8 text on white | 5.07:1 | AA | Lc 74.7 | Content text, not long reading |
| #366CC8 text on black | 4.13:1 | AA large text | Lc -27.0 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CBDAF3
oklch(88.5% 0.038 260.7)
-
Step 300
300
#A7C2EE
oklch(80.9% 0.069 260.1)
-
Step 400
400
#78A1E6
oklch(70.7% 0.111 260.5)
-
Step 500
500
#5588DE
oklch(63.1% 0.141 260.3)
-
Step 600
600 (this color)
#366CC8
oklch(54.4% 0.154 260.3)
-
Step 700
700
#2C5DB1
oklch(49.1% 0.144 260.4)
-
Step 800
800
#254C8F
oklch(42.6% 0.12 260.4)
-
Step 900
900
#234072
oklch(37.6% 0.093 260.6)
-
Step 950
950
#152643
oklch(27% 0.059 260.5)
#366CC8 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) | #3C75CB | 0.026 |
| Deuteranopia (no green cones) | #1B68C6 | 0.023 |
| Tritanopia (no blue cones) | #008290 | 0.123 |
| Achromatopsia (no color) | #6E6E6E | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366CC8
#366CC8
oklch(54.4% 0.154 260.3)
- #916700
#916700
oklch(54.3% 0.112 80.5)
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 #366CC8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.036
- Windows Blue #3778BF ΔE 0.038
- Royal Blue #4169E1 ΔE 0.042
- French Blue #436BAD ΔE 0.043
- Flat Blue #3C73A8 ΔE 0.058
- Cerulean Blue #056EEE ΔE 0.060
- Nice Blue #107AB0 ΔE 0.061
- Warm Blue #4B57DB ΔE 0.062
Use #366CC8 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.