#3973F8
Closest named color: Clear Blue (#247AFD). oklch(59.4% 0.208 263.6), rgb(57, 115, 248).
Aa
Black text reads best on this color (4.98:1).
About this color
#3973F8 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.208 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.020 away. Black text reads best on it, at 4.98:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.208) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 4.98:1 |
| White text | 4.21:1 |
Values
| HEX | #3973F8 |
| RGB | rgb(57, 115, 248) |
| HSL | hsl(222, 93%, 60%) |
| OKLCH | oklch(59.4% 0.208 263.6) |
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 #3973F8 | 4.21:1 | AA large text | Lc -74.0 | Content text, not long reading |
| Black text on #3973F8 | 4.98:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #3973F8 text on white | 4.21:1 | AA large text | Lc 68.5 | Content text, not long reading |
| #3973F8 text on black | 4.98:1 | AA | Lc -33.1 | 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 500.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFE
oklch(93.6% 0.029 264.4)
-
Step 200
200
#C6DAFF
oklch(88.5% 0.056 262.8)
-
Step 300
300
#A1C1FF
oklch(81% 0.095 263.3)
-
Step 400
400
#6E9DFF
oklch(70.6% 0.153 263.6)
-
Step 500
500 (this color)
#3973F8
oklch(59.4% 0.208 263.6)
-
Step 600
600
#2764F5
oklch(55.7% 0.226 263.5)
-
Step 700
700
#1B51D5
oklch(49% 0.21 263.5)
-
Step 800
800
#1844AC
oklch(42.8% 0.173 263.4)
-
Step 900
900
#193B88
oklch(37.7% 0.135 263.4)
-
Step 950
950
#0F2350
oklch(27% 0.087 263.6)
#3973F8 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) | #0084FD | 0.043 |
| Deuteranopia (no green cones) | #0073F5 | 0.025 |
| Tritanopia (no blue cones) | #0094AA | 0.164 |
| Achromatopsia (no color) | #7B7B7B | 0.209 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3973F8
#3973F8
oklch(59.4% 0.208 263.6)
- #A17600
#A17600
oklch(59.3% 0.122 83)
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 #3973F8, closest first.
No curated palette has a color within ΔE 0.04 of #3973F8.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.020
- Cerulean Blue #056EEE ΔE 0.034
- Royal Blue #4169E1 ΔE 0.041
- Neon Blue #4361EE ΔE 0.043
- Bright Blue #0165FC ΔE 0.047
- Cornflower #6A79F7 ΔE 0.056
- Azul #1D5DEC ΔE 0.062
- Dodger Blue #1E90FF ΔE 0.071
Use #3973F8 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.