#2B66EE
Closest named color: Cerulean Blue (#056EEE). oklch(55.6% 0.214 263.3), rgb(43, 102, 238).
Aa
White text reads best on this color (4.95:1).
About this color
#2B66EE is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.214 and its hue 263°. 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 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.214) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.23:1 |
| White text | 4.95:1 |
Values
| HEX | #2B66EE |
| RGB | rgb(43, 102, 238) |
| HSL | hsl(222, 85%, 55%) |
| OKLCH | oklch(55.6% 0.214 263.3) |
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 #2B66EE | 4.95:1 | AA | Lc -79.0 | Fine for body text |
| Black text on #2B66EE | 4.23:1 | AA large text | Lc 30.5 | Non-text elements, placeholder text |
| #2B66EE text on white | 4.95:1 | AA | Lc 73.6 | Content text, not long reading |
| #2B66EE text on black | 4.23:1 | AA large text | Lc -28.1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFD
oklch(93.5% 0.028 263.4)
-
Step 200
200
#C7DAFE
oklch(88.6% 0.054 263.2)
-
Step 300
300
#A1C1FF
oklch(81% 0.095 263.3)
-
Step 400
400
#6E9DFF
oklch(70.6% 0.153 263.6)
-
Step 500
500
#4781FF
oklch(63.2% 0.197 263.3)
-
Step 600
600 (this color)
#2B66EE
oklch(55.6% 0.214 263.3)
-
Step 700
700
#1F54CF
oklch(49.2% 0.198 263.3)
-
Step 800
800
#1B45A7
oklch(42.6% 0.165 263.4)
-
Step 900
900
#1B3C85
oklch(37.8% 0.129 263.3)
-
Step 950
950
#10244E
oklch(27.1% 0.082 263)
#2B66EE 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) | #0079F3 | 0.045 |
| Deuteranopia (no green cones) | #0067EB | 0.017 |
| Tritanopia (no blue cones) | #0088A0 | 0.165 |
| Achromatopsia (no color) | #707070 | 0.215 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B66EE
#2B66EE
oklch(55.6% 0.214 263.3)
- #936C00
#936C00
oklch(55.6% 0.114 83.5)
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 #2B66EE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.021
- Neon Blue #4361EE ΔE 0.021
- Azul #1D5DEC ΔE 0.025
- Bright Blue #0165FC ΔE 0.026
- Royal Blue #4169E1 ΔE 0.028
- Warm Blue #4B57DB ΔE 0.049
- Clear Blue #247AFD ΔE 0.052
- Electric Blue #0652FF ΔE 0.055
Use #2B66EE 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.