#3971EF
Closest named color: Cerulean Blue (#056EEE). oklch(58.3% 0.199 263.4), rgb(57, 113, 239).
Aa
Black text reads best on this color (4.78:1).
About this color
#3971EF is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.199 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.027 away. Black text reads best on it, at 4.78:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.199) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.78:1 |
| White text | 4.39:1 |
Values
| HEX | #3971EF |
| RGB | rgb(57, 113, 239) |
| HSL | hsl(222, 85%, 58%) |
| OKLCH | oklch(58.3% 0.199 263.4) |
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 #3971EF | 4.39:1 | AA large text | Lc -75.4 | Fine for body text |
| Black text on #3971EF | 4.78:1 | AA | Lc 34.2 | Non-text elements, placeholder text |
| #3971EF text on white | 4.39:1 | AA large text | Lc 69.9 | Content text, not long reading |
| #3971EF text on black | 4.78:1 | AA | Lc -31.7 | 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
#A3C1FB
oklch(81% 0.089 263.3)
-
Step 400
400
#719EFA
oklch(70.7% 0.144 263.4)
-
Step 500
500
#4D82F7
oklch(63.1% 0.184 263.7)
-
Step 600
600 (this color)
#3971EF
oklch(58.3% 0.199 263.4)
-
Step 700
700
#2556C8
oklch(49.2% 0.186 263.5)
-
Step 800
800
#1F47A1
oklch(42.6% 0.153 263.3)
-
Step 900
900
#1E3D80
oklch(37.7% 0.119 263.2)
-
Step 950
950
#12244B
oklch(26.9% 0.076 263.5)
#3971EF 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) | #0B81F3 | 0.041 |
| Deuteranopia (no green cones) | #0070ED | 0.026 |
| Tritanopia (no blue cones) | #0090A5 | 0.157 |
| Achromatopsia (no color) | #787878 | 0.200 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3971EF
#3971EF
oklch(58.3% 0.199 263.4)
- #9D7300
#9D7300
oklch(58.2% 0.12 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 #3971EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.027
- Royal Blue #4169E1 ΔE 0.027
- Clear Blue #247AFD ΔE 0.029
- Neon Blue #4361EE ΔE 0.037
- Bright Blue #0165FC ΔE 0.047
- Azul #1D5DEC ΔE 0.055
- Cornflower #6A79F7 ΔE 0.060
- Warm Blue #4B57DB ΔE 0.066
Use #3971EF 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.