#366BC1
Closest named color: Mid Blue (#276AB3). oklch(53.7% 0.146 259.6), rgb(54, 107, 193).
Aa
White text reads best on this color (5.21:1).
About this color
#366BC1 is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.146 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.026 away. White text reads best on it, at 5.21:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.02:1 |
| White text | 5.21:1 |
Values
| HEX | #366BC1 |
| RGB | rgb(54, 107, 193) |
| HSL | hsl(217, 56%, 48%) |
| OKLCH | oklch(53.7% 0.146 259.6) |
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 #366BC1 | 5.21:1 | AA | Lc -80.9 | Fine for body text |
| Black text on #366BC1 | 4.02:1 | AA large text | Lc 28.6 | Dividers and decoration only |
| #366BC1 text on white | 5.21:1 | AA | Lc 75.5 | Fine for body text |
| #366BC1 text on black | 4.02:1 | AA large text | Lc -26.2 | 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
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A8C2EC
oklch(80.9% 0.066 259.9)
-
Step 400
400
#79A1E2
oklch(70.6% 0.106 259.8)
-
Step 500
500
#5789DA
oklch(63.2% 0.134 259.6)
-
Step 600
600 (this color)
#366BC1
oklch(53.7% 0.146 259.6)
-
Step 700
700
#2E5EAC
oklch(49.1% 0.135 259.7)
-
Step 800
800
#274D8C
oklch(42.7% 0.113 259.9)
-
Step 900
900
#244170
oklch(37.8% 0.088 259.6)
-
Step 950
950
#152641
oklch(26.9% 0.056 259.3)
#366BC1 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) | #4073C4 | 0.025 |
| Deuteranopia (no green cones) | #2567BF | 0.019 |
| Tritanopia (no blue cones) | #007F8C | 0.116 |
| Achromatopsia (no color) | #6D6D6D | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366BC1
#366BC1
oklch(53.7% 0.146 259.6)
- #8F6500
#8F6500
oklch(53.7% 0.111 80)
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 #366BC1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.026
- French Blue #436BAD ΔE 0.033
- Windows Blue #3778BF ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.050
- Royal Blue #4169E1 ΔE 0.052
- Nice Blue #107AB0 ΔE 0.056
- Muted Blue #3B719F ΔE 0.060
- Iris #6258C4 ΔE 0.067
Use #366BC1 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.