#366BB5
Closest named color: Mid Blue (#276AB3). oklch(52.9% 0.13 257.2), rgb(54, 107, 181).
Aa
White text reads best on this color (5.34:1).
About this color
#366BB5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.130 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.013 away. White text reads best on it, at 5.34:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.92:1 |
| White text | 5.34:1 |
Values
| HEX | #366BB5 |
| RGB | rgb(54, 107, 181) |
| HSL | hsl(215, 54%, 46%) |
| OKLCH | oklch(52.9% 0.13 257.2) |
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 #366BB5 | 5.34:1 | AA | Lc -81.7 | Fine for body text |
| Black text on #366BB5 | 3.92:1 | AA large text | Lc 27.7 | Dividers and decoration only |
| #366BB5 text on white | 5.34:1 | AA | Lc 76.3 | Fine for body text |
| #366BB5 text on black | 3.92:1 | AA large text | Lc -25.4 | 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
#E3EBF5
oklch(93.7% 0.016 253.9)
-
Step 200
200
#CCDAEF
oklch(88.4% 0.033 258.4)
-
Step 300
300
#A9C3E7
oklch(81% 0.058 256.6)
-
Step 400
400
#7BA3DB
oklch(70.8% 0.094 256.9)
-
Step 500
500
#598AD1
oklch(63% 0.12 257.6)
-
Step 600
600 (this color)
#366BB5
oklch(52.9% 0.13 257.2)
-
Step 700
700
#3060A4
oklch(49.1% 0.121 257.5)
-
Step 800
800
#284F85
oklch(42.7% 0.1 257)
-
Step 900
900
#25426A
oklch(37.7% 0.077 256.8)
-
Step 950
950
#16273E
oklch(27% 0.049 256.3)
#366BB5 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) | #4971B8 | 0.027 |
| Deuteranopia (no green cones) | #3465B3 | 0.017 |
| Tritanopia (no blue cones) | #007C87 | 0.102 |
| Achromatopsia (no color) | #6B6B6B | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366BB5
#366BB5
oklch(52.9% 0.13 257.2)
- #8F6200
#8F6200
oklch(53% 0.111 77.4)
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 #366BB5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.013
- French Blue #436BAD ΔE 0.017
- Flat Blue #3C73A8 ΔE 0.035
- Windows Blue #3778BF ΔE 0.037
- Muted Blue #3B719F ΔE 0.043
- Nice Blue #107AB0 ΔE 0.047
- Ocean Blue #03719C ΔE 0.054
- Dusky Blue #475F94 ΔE 0.057
Use #366BB5 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.