#3973EE
Closest named color: Clear Blue (#247AFD). oklch(58.6% 0.196 262.9), rgb(57, 115, 238).
Aa
Black text reads best on this color (4.86:1).
About this color
#3973EE is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.196 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.028 away. Black text reads best on it, at 4.86:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.196) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 4.86:1 |
| White text | 4.32:1 |
Values
| HEX | #3973EE |
| RGB | rgb(57, 115, 238) |
| HSL | hsl(221, 84%, 58%) |
| OKLCH | oklch(58.6% 0.196 262.9) |
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 #3973EE | 4.32:1 | AA large text | Lc -74.9 | Content text, not long reading |
| Black text on #3973EE | 4.86:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #3973EE text on white | 4.32:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #3973EE text on black | 4.86:1 | AA | Lc -32.3 | 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
#C8DAFA
oklch(88.5% 0.048 262)
-
Step 300
300
#A3C1FA
oklch(80.9% 0.087 263)
-
Step 400
400
#719EF8
oklch(70.6% 0.141 263.1)
-
Step 500
500
#4C83F5
oklch(63.1% 0.181 262.9)
-
Step 600
600 (this color)
#3973EE
oklch(58.6% 0.196 262.9)
-
Step 700
700
#2457C6
oklch(49.2% 0.182 262.9)
-
Step 800
800
#1F48A0
oklch(42.8% 0.15 262.9)
-
Step 900
900
#1E3D7F
oklch(37.7% 0.118 263)
-
Step 950
950
#12244A
oklch(26.9% 0.075 263.2)
#3973EE 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) | #1C82F2 | 0.038 |
| Deuteranopia (no green cones) | #0072EC | 0.026 |
| Tritanopia (no blue cones) | #0091A5 | 0.154 |
| Achromatopsia (no color) | #7A7A7A | 0.196 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3973EE
#3973EE
oklch(58.6% 0.196 262.9)
- #9F7400
#9F7400
oklch(58.7% 0.121 82.6)
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 #3973EE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.028
- Royal Blue #4169E1 ΔE 0.030
- Cerulean Blue #056EEE ΔE 0.030
- Neon Blue #4361EE ΔE 0.042
- Bright Blue #0165FC ΔE 0.051
- Cornflower #6A79F7 ΔE 0.058
- Azul #1D5DEC ΔE 0.060
- Warm Blue #4B57DB ΔE 0.070
Use #3973EE 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.