#2B66C9
Closest named color: Mid Blue (#276AB3). oklch(52.8% 0.166 260.2), rgb(43, 102, 201).
Aa
White text reads best on this color (5.45:1).
About this color
#2B66C9 is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.166 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.038 away. White text reads best on it, at 5.45:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.84:1 |
| White text | 5.45:1 |
Values
| HEX | #2B66C9 |
| RGB | rgb(43, 102, 201) |
| HSL | hsl(218, 65%, 48%) |
| OKLCH | oklch(52.8% 0.166 260.2) |
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 #2B66C9 | 5.45:1 | AA | Lc -82.1 | Fine for body text |
| Black text on #2B66C9 | 3.84:1 | AA large text | Lc 27.3 | Dividers and decoration only |
| #2B66C9 text on white | 5.45:1 | AA | Lc 76.8 | Fine for body text |
| #2B66C9 text on black | 3.84:1 | AA large text | Lc -25.0 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A5C2F2
oklch(80.9% 0.075 260.4)
-
Step 400
400
#74A1EB
oklch(70.7% 0.12 260)
-
Step 500
500
#5087E5
oklch(63.1% 0.154 260.4)
-
Step 600
600 (this color)
#2B66C9
oklch(52.8% 0.166 260.2)
-
Step 700
700
#265CB6
oklch(49% 0.154 260.1)
-
Step 800
800
#214C94
oklch(42.8% 0.128 260.1)
-
Step 900
900
#204076
oklch(37.8% 0.1 260.2)
-
Step 950
950
#132645
oklch(27.1% 0.063 259.7)
#2B66C9 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) | #2B71CD | 0.029 |
| Deuteranopia (no green cones) | #0063C7 | 0.022 |
| Tritanopia (no blue cones) | #007E8E | 0.129 |
| Achromatopsia (no color) | #696969 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B66C9
#2B66C9
oklch(52.8% 0.166 260.2)
- #8C6300
#8C6300
oklch(52.9% 0.109 80.2)
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 #2B66C9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.038
- Royal Blue #4169E1 ΔE 0.044
- French Blue #436BAD ΔE 0.052
- Warm Blue #4B57DB ΔE 0.053
- Windows Blue #3778BF ΔE 0.056
- Cerulean Blue #056EEE ΔE 0.059
- Azul #1D5DEC ΔE 0.060
- Neon Blue #4361EE ΔE 0.063
Use #2B66C9 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.