#366EC1
Closest named color: Mid Blue (#276AB3). oklch(54.3% 0.143 258.3), rgb(54, 110, 193).
Aa
White text reads best on this color (5.05:1).
About this color
#366EC1 is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.143 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.028 away. White text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.15:1 |
| White text | 5.05:1 |
Values
| HEX | #366EC1 |
| RGB | rgb(54, 110, 193) |
| HSL | hsl(216, 56%, 48%) |
| OKLCH | oklch(54.3% 0.143 258.3) |
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 #366EC1 | 5.05:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #366EC1 | 4.15:1 | AA large text | Lc 29.5 | Dividers and decoration only |
| #366EC1 text on white | 5.05:1 | AA | Lc 74.6 | Content text, not long reading |
| #366EC1 text on black | 4.15:1 | AA large text | Lc -27.2 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CBDAF1
oklch(88.4% 0.036 258.9)
-
Step 300
300
#A8C2EB
oklch(80.9% 0.065 259.4)
-
Step 400
400
#78A2E0
oklch(70.7% 0.102 258)
-
Step 500
500
#558AD8
oklch(63.2% 0.131 258)
-
Step 600
600 (this color)
#366EC1
oklch(54.3% 0.143 258.3)
-
Step 700
700
#2C5FAA
oklch(49.1% 0.132 258.2)
-
Step 800
800
#254E8A
oklch(42.7% 0.11 258.1)
-
Step 900
900
#23416E
oklch(37.6% 0.085 258.3)
-
Step 950
950
#152641
oklch(26.9% 0.056 259.3)
#366EC1 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) | #4676C4 | 0.029 |
| Deuteranopia (no green cones) | #2D69BF | 0.017 |
| Tritanopia (no blue cones) | #00818E | 0.111 |
| Achromatopsia (no color) | #6F6F6F | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #366EC1
#366EC1
oklch(54.3% 0.143 258.3)
- #936600
#936600
oklch(54.3% 0.113 78.4)
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 #366EC1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.028
- Windows Blue #3778BF ΔE 0.029
- French Blue #436BAD ΔE 0.032
- Flat Blue #3C73A8 ΔE 0.045
- Nice Blue #107AB0 ΔE 0.050
- Royal Blue #4169E1 ΔE 0.054
- Muted Blue #3B719F ΔE 0.056
- Water Blue #0E87CC ΔE 0.067
Use #366EC1 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.