#2973E4
Closest named color: Cerulean Blue (#056EEE). oklch(57.4% 0.187 259.2), rgb(41, 115, 228).
Aa
Black text reads best on this color (4.66:1).
About this color
#2973E4 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.187 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.025 away. Black text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.187) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.66:1 |
| White text | 4.49:1 |
Values
| HEX | #2973E4 |
| RGB | rgb(41, 115, 228) |
| HSL | hsl(216, 78%, 53%) |
| OKLCH | oklch(57.4% 0.187 259.2) |
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 #2973E4 | 4.49:1 | AA large text | Lc -76.2 | Fine for body text |
| Black text on #2973E4 | 4.66:1 | AA | Lc 33.4 | Non-text elements, placeholder text |
| #2973E4 text on white | 4.49:1 | AA large text | Lc 70.7 | Content text, not long reading |
| #2973E4 text on black | 4.66:1 | AA | Lc -31.0 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAF9
oklch(88.4% 0.048 260.2)
-
Step 300
300
#A0C2F7
oklch(80.8% 0.084 259.1)
-
Step 400
400
#6CA1F4
oklch(70.8% 0.135 259.1)
-
Step 500
500
#4486EF
oklch(63% 0.172 259.4)
-
Step 600
600 (this color)
#2973E4
oklch(57.4% 0.187 259.2)
-
Step 700
700
#155BC1
oklch(49.2% 0.174 259.1)
-
Step 800
800
#154B9C
oklch(42.8% 0.144 259.1)
-
Step 900
900
#183F7C
oklch(37.6% 0.113 259.2)
-
Step 950
950
#0F2648
oklch(27.1% 0.07 258.2)
#2973E4 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) | #2C80E8 | 0.034 |
| Deuteranopia (no green cones) | #006FE2 | 0.020 |
| Tritanopia (no blue cones) | #008EA1 | 0.142 |
| Achromatopsia (no color) | #777777 | 0.187 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2973E4
#2973E4
oklch(57.4% 0.187 259.2)
- #9E6F00
#9E6F00
oklch(57.5% 0.119 79.2)
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 #2973E4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.025
- Royal Blue #4169E1 ΔE 0.028
- Clear Blue #247AFD ΔE 0.040
- Neon Blue #4361EE ΔE 0.048
- Bright Blue #0165FC ΔE 0.054
- Azul #1D5DEC ΔE 0.057
- Windows Blue #3778BF ΔE 0.061
- Warm Blue #4B57DB ΔE 0.068
Use #2973E4 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.