#0369E3
Closest named color: Cerulean Blue (#056EEE). oklch(54.6% 0.202 258.2), rgb(3, 105, 227).
Aa
White text reads best on this color (5.08:1).
About this color
#0369E3 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.202 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.021 away. White text reads best on it, at 5.08:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.202) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.13:1 |
| White text | 5.08:1 |
Values
| HEX | #0369E3 |
| RGB | rgb(3, 105, 227) |
| HSL | hsl(213, 97%, 45%) |
| OKLCH | oklch(54.6% 0.202 258.2) |
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 #0369E3 | 5.08:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #0369E3 | 4.13:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #0369E3 text on white | 5.08:1 | AA | Lc 74.2 | Content text, not long reading |
| #0369E3 text on black | 4.13:1 | AA large text | Lc -27.5 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C5DBFB
oklch(88.5% 0.05 257.7)
-
Step 300
300
#9CC3FC
oklch(81% 0.091 257.8)
-
Step 400
400
#65A1FA
oklch(70.7% 0.145 258.1)
-
Step 500
500
#3886F7
oklch(63.1% 0.186 258.2)
-
Step 600
600 (this color)
#0369E3
oklch(54.6% 0.202 258.2)
-
Step 700
700
#005AC6
oklch(49.1% 0.184 258.2)
-
Step 800
800
#044AA2
oklch(42.8% 0.156 258.2)
-
Step 900
900
#103F80
oklch(37.7% 0.121 258)
-
Step 950
950
#0B254B
oklch(26.9% 0.077 258.3)
#0369E3 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) | #0078E7 | 0.038 |
| Deuteranopia (no green cones) | #0066E1 | 0.008 |
| Tritanopia (no blue cones) | #00889C | 0.153 |
| Achromatopsia (no color) | #6E6E6E | 0.203 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0369E3
#0369E3
oklch(54.6% 0.202 258.2)
- #946700
#946700
oklch(54.7% 0.114 78.6)
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 #0369E3, closest first.
No curated palette has a color within ΔE 0.04 of #0369E3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.021
- Azul #1D5DEC ΔE 0.031
- Royal Blue #4169E1 ΔE 0.034
- Bright Blue #0165FC ΔE 0.039
- Neon Blue #4361EE ΔE 0.042
- Warm Blue #4B57DB ΔE 0.057
- Clear Blue #247AFD ΔE 0.060
- Electric Blue #0652FF ΔE 0.065
Use #0369E3 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.