#2F66EF
Closest named color: Neon Blue (#4361EE). oklch(55.8% 0.215 264), rgb(47, 102, 239).
Aa
White text reads best on this color (4.92:1).
About this color
#2F66EF is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.215 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.019 away. White text reads best on it, at 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.215) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.26:1 |
| White text | 4.92:1 |
Values
| HEX | #2F66EF |
| RGB | rgb(47, 102, 239) |
| HSL | hsl(223, 86%, 56%) |
| OKLCH | oklch(55.8% 0.215 264) |
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 #2F66EF | 4.92:1 | AA | Lc -78.8 | Fine for body text |
| Black text on #2F66EF | 4.26:1 | AA large text | Lc 30.7 | Non-text elements, placeholder text |
| #2F66EF text on white | 4.92:1 | AA | Lc 73.4 | Content text, not long reading |
| #2F66EF text on black | 4.26:1 | AA large text | Lc -28.3 | 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
#A1C0FF
oklch(80.8% 0.096 264.1)
-
Step 400
400
#6F9DFF
oklch(70.7% 0.152 263.9)
-
Step 500
500
#4A80FF
oklch(63.1% 0.198 264.2)
-
Step 600
600 (this color)
#2F66EF
oklch(55.8% 0.215 264)
-
Step 700
700
#2253CF
oklch(49.1% 0.199 264)
-
Step 800
800
#1D45A8
oklch(42.8% 0.166 264)
-
Step 900
900
#1D3B85
oklch(37.7% 0.13 264.4)
-
Step 950
950
#11244E
oklch(27.1% 0.081 263.6)
#2F66EF 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) | #007AF4 | 0.048 |
| Deuteranopia (no green cones) | #0068EC | 0.020 |
| Tritanopia (no blue cones) | #0089A1 | 0.166 |
| Achromatopsia (no color) | #707070 | 0.215 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F66EF
#2F66EF
oklch(55.8% 0.215 264)
- #936D00
#936D00
oklch(55.8% 0.114 84.3)
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 #2F66EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.019
- Cerulean Blue #056EEE ΔE 0.023
- Azul #1D5DEC ΔE 0.027
- Bright Blue #0165FC ΔE 0.027
- Royal Blue #4169E1 ΔE 0.028
- Warm Blue #4B57DB ΔE 0.049
- Clear Blue #247AFD ΔE 0.051
- Electric Blue #0652FF ΔE 0.056
Use #2F66EF 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.