#3957E0
Closest named color: Warm Blue (#4B57DB). oklch(52.1% 0.21 268.4), rgb(57, 87, 224).
Aa
White text reads best on this color (5.81:1).
About this color
#3957E0 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.210 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.022 away. White text reads best on it, at 5.81:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.210) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.61:1 |
| White text | 5.81:1 |
Values
| HEX | #3957E0 |
| RGB | rgb(57, 87, 224) |
| HSL | hsl(229, 73%, 55%) |
| OKLCH | oklch(52.1% 0.21 268.4) |
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 #3957E0 | 5.81:1 | AA | Lc -83.7 | Fine for body text |
| Black text on #3957E0 | 3.61:1 | AA large text | Lc 25.6 | Dividers and decoration only |
| #3957E0 text on white | 5.81:1 | AA | Lc 78.4 | Fine for body text |
| #3957E0 text on black | 3.61:1 | AA large text | Lc -23.4 | Dividers and decoration only |
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 700.
-
Step 50
50
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFE
oklch(93.6% 0.029 266.4)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A7BFFF
oklch(81% 0.095 268.4)
-
Step 400
400
#799AFF
oklch(70.6% 0.153 268.6)
-
Step 500
500
#587DFF
oklch(63.1% 0.197 268.3)
-
Step 600
600
#3F5FF5
oklch(55.6% 0.226 268.5)
-
Step 700
700 (this color)
#3957E0
oklch(52.1% 0.21 268.4)
-
Step 800
800
#2940AC
oklch(42.6% 0.174 268.5)
-
Step 900
900
#243888
oklch(37.6% 0.136 268.4)
-
Step 950
950
#152250
oklch(27.1% 0.086 268.3)
#3957E0 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) | #006DE4 | 0.053 |
| Deuteranopia (no green cones) | #005EDD | 0.032 |
| Tritanopia (no blue cones) | #007A93 | 0.166 |
| Achromatopsia (no color) | #656565 | 0.211 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3957E0
#3957E0
oklch(52.1% 0.21 268.4)
- #836500
#836500
oklch(52.2% 0.107 88.2)
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 #3957E0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.022
- Azul #1D5DEC ΔE 0.028
- Neon Blue #4361EE ΔE 0.035
- Royal Blue #4169E1 ΔE 0.045
- Bright Blue #0165FC ΔE 0.055
- Electric Blue #0652FF ΔE 0.057
- Cerulean Blue #056EEE ΔE 0.057
- Dark Periwinkle #665FD1 ΔE 0.068
Use #3957E0 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.