#3973F0
Closest named color: Clear Blue (#247AFD). oklch(58.8% 0.198 263), rgb(57, 115, 240).
Aa
Black text reads best on this color (4.88:1).
About this color
#3973F0 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.198 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.026 away. Black text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.198) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 4.88:1 |
| White text | 4.29:1 |
Values
| HEX | #3973F0 |
| RGB | rgb(57, 115, 240) |
| HSL | hsl(221, 86%, 58%) |
| OKLCH | oklch(58.8% 0.198 263) |
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 #3973F0 | 4.29:1 | AA large text | Lc -74.7 | Content text, not long reading |
| Black text on #3973F0 | 4.88:1 | AA | Lc 34.9 | Non-text elements, placeholder text |
| #3973F0 text on white | 4.29:1 | AA large text | Lc 69.2 | Content text, not long reading |
| #3973F0 text on black | 4.88:1 | AA | Lc -32.4 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C8DAFB
oklch(88.5% 0.05 262.6)
-
Step 300
300
#A2C1FB
oklch(80.9% 0.089 262.7)
-
Step 400
400
#719EF9
oklch(70.7% 0.143 263.3)
-
Step 500
500
#4C83F6
oklch(63.1% 0.182 263)
-
Step 600
600 (this color)
#3973F0
oklch(58.8% 0.198 263)
-
Step 700
700
#2356C7
oklch(49% 0.185 263)
-
Step 800
800
#1E47A1
oklch(42.6% 0.153 263.1)
-
Step 900
900
#1E3D80
oklch(37.7% 0.119 263.2)
-
Step 950
950
#12244B
oklch(26.9% 0.076 263.5)
#3973F0 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) | #1683F4 | 0.040 |
| Deuteranopia (no green cones) | #0072EE | 0.026 |
| Tritanopia (no blue cones) | #0091A6 | 0.155 |
| Achromatopsia (no color) | #7A7A7A | 0.198 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3973F0
#3973F0
oklch(58.8% 0.198 263)
- #9F7500
#9F7500
oklch(58.9% 0.121 83.4)
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 #3973F0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.026
- Cerulean Blue #056EEE ΔE 0.030
- Royal Blue #4169E1 ΔE 0.032
- Neon Blue #4361EE ΔE 0.042
- Bright Blue #0165FC ΔE 0.050
- Cornflower #6A79F7 ΔE 0.058
- Azul #1D5DEC ΔE 0.060
- Warm Blue #4B57DB ΔE 0.071
Use #3973F0 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.