#2A78DC
Closest named color: Royal Blue (#4169E1). oklch(57.9% 0.17 256.6), rgb(42, 120, 220).
Aa
Black text reads best on this color (4.81:1).
About this color
#2A78DC is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.170 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.040 away. Black text reads best on it, at 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.81:1 |
| White text | 4.35:1 |
Values
| HEX | #2A78DC |
| RGB | rgb(42, 120, 220) |
| HSL | hsl(214, 72%, 51%) |
| OKLCH | oklch(57.9% 0.17 256.6) |
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 #2A78DC | 4.35:1 | AA large text | Lc -75.2 | Fine for body text |
| Black text on #2A78DC | 4.81:1 | AA | Lc 34.4 | Non-text elements, placeholder text |
| #2A78DC text on white | 4.35:1 | AA large text | Lc 69.7 | Content text, not long reading |
| #2A78DC text on black | 4.81:1 | AA | Lc -32.0 | Non-text elements, placeholder text |
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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF6
oklch(88.6% 0.043 257.1)
-
Step 300
300
#A1C3F2
oklch(80.9% 0.076 256.6)
-
Step 400
400
#6DA2EC
oklch(70.6% 0.123 256.9)
-
Step 500
500
#4489E6
oklch(63.1% 0.157 256.7)
-
Step 600
600 (this color)
#2A78DC
oklch(57.9% 0.17 256.6)
-
Step 700
700
#135EB8
oklch(49.2% 0.158 256.5)
-
Step 800
800
#144D95
oklch(42.7% 0.132 256.7)
-
Step 900
900
#184176
oklch(37.7% 0.101 256.3)
-
Step 950
950
#0F2645
oklch(26.9% 0.065 256.6)
#2A78DC 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) | #4281E0 | 0.033 |
| Deuteranopia (no green cones) | #1472DA | 0.021 |
| Tritanopia (no blue cones) | #00909F | 0.130 |
| Achromatopsia (no color) | #797979 | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A78DC
#2A78DC
oklch(57.9% 0.17 256.6)
- #A26F00
#A26F00
oklch(58% 0.121 76.9)
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 #2A78DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.040
- Cerulean Blue #056EEE ΔE 0.043
- Windows Blue #3778BF ΔE 0.045
- Clear Blue #247AFD ΔE 0.050
- Water Blue #0E87CC ΔE 0.051
- Neon Blue #4361EE ΔE 0.065
- Dark Sky Blue #448EE4 ΔE 0.065
- Mid Blue #276AB3 ΔE 0.070
Use #2A78DC 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.