#1966EE
Closest named color: Cerulean Blue (#056EEE). oklch(55.2% 0.218 261.2), rgb(25, 102, 238).
Aa
White text reads best on this color (5.02:1).
About this color
#1966EE is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.218 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.019 away. White text reads best on it, at 5.02:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.218) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.17:1 |
| White text | 5.02:1 |
Values
| HEX | #1966EE |
| RGB | rgb(25, 102, 238) |
| HSL | hsl(218, 86%, 52%) |
| OKLCH | oklch(55.2% 0.218 261.2) |
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 #1966EE | 5.02:1 | AA | Lc -79.4 | Fine for body text |
| Black text on #1966EE | 4.17:1 | AA large text | Lc 30.1 | Non-text elements, placeholder text |
| #1966EE text on white | 5.02:1 | AA | Lc 73.9 | Content text, not long reading |
| #1966EE text on black | 4.17:1 | AA large text | Lc -27.8 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C5DAFE
oklch(88.4% 0.055 261.2)
-
Step 300
300
#9EC1FF
oklch(80.8% 0.096 261.6)
-
Step 400
400
#699FFF
oklch(70.8% 0.152 261.1)
-
Step 500
500
#3E82FF
oklch(63% 0.199 261.3)
-
Step 600
600 (this color)
#1966EE
oklch(55.2% 0.218 261.2)
-
Step 700
700
#0C55D0
oklch(49.1% 0.201 261)
-
Step 800
800
#0F46A8
oklch(42.6% 0.167 261.2)
-
Step 900
900
#143C85
oklch(37.5% 0.131 261.2)
-
Step 950
950
#0D244E
oklch(27% 0.083 261.2)
#1966EE 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 | 0.046 |
| Deuteranopia (no green cones) | #0066EB | 0.009 |
| Tritanopia (no blue cones) | #0089A0 | 0.167 |
| Achromatopsia (no color) | #6F6F6F | 0.218 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1966EE
#1966EE
oklch(55.2% 0.218 261.2)
- #946A00
#946A00
oklch(55.3% 0.114 81.2)
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 #1966EE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.019
- Azul #1D5DEC ΔE 0.021
- Bright Blue #0165FC ΔE 0.022
- Neon Blue #4361EE ΔE 0.030
- Royal Blue #4169E1 ΔE 0.036
- Electric Blue #0652FF ΔE 0.051
- Warm Blue #4B57DB ΔE 0.054
- Clear Blue #247AFD ΔE 0.054
Use #1966EE 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.