#3F57BD
Closest named color: Warm Blue (#4B57DB). oklch(49.6% 0.162 269.6), rgb(63, 87, 189).
Aa
White text reads best on this color (6.34:1).
About this color
#3F57BD is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.162 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.049 away. White text reads best on it, at 6.34:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.162) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.30:1 |
| White text | 6.34:1 |
Values
| HEX | #3F57BD |
| RGB | rgb(63, 87, 189) |
| HSL | hsl(229, 50%, 49%) |
| OKLCH | oklch(49.6% 0.162 269.6) |
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 #3F57BD | 6.34:1 | AA | Lc -86.3 | Fine for body text |
| Black text on #3F57BD | 3.30:1 | AA large text | Lc 22.9 | Dividers and decoration only |
| #3F57BD text on white | 6.34:1 | AA | Lc 81.2 | Fine for body text |
| #3F57BD text on black | 3.30:1 | AA large text | Lc -20.7 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E4EAFA
oklch(93.7% 0.023 269.4)
-
Step 200
200
#CDD9F7
oklch(88.6% 0.043 268.2)
-
Step 300
300
#ACBFF4
oklch(80.9% 0.078 269.3)
-
Step 400
400
#829CEF
oklch(70.7% 0.125 269.8)
-
Step 500
500
#6481EA
oklch(63.2% 0.161 269.7)
-
Step 600
600
#4C68D8
oklch(55.7% 0.174 269.4)
-
Step 700
700 (this color)
#3F57BD
oklch(49.6% 0.162 269.6)
-
Step 800
800
#334697
oklch(42.6% 0.134 269.9)
-
Step 900
900
#2C3C79
oklch(37.7% 0.105 269.7)
-
Step 950
950
#1A2447
oklch(27.1% 0.066 269.6)
#3F57BD 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) | #0C65C1 | 0.045 |
| Deuteranopia (no green cones) | #005ABB | 0.040 |
| Tritanopia (no blue cones) | #006F81 | 0.134 |
| Achromatopsia (no color) | #5F5F5F | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F57BD
#3F57BD
oklch(49.6% 0.162 269.6)
- #795E00
#795E00
oklch(49.5% 0.101 89.1)
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 #3F57BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.049
- Iris #6258C4 ΔE 0.050
- Mid Blue #276AB3 ΔE 0.056
- French Blue #436BAD ΔE 0.064
- Blue With A Hint Of Purple #533CC6 ΔE 0.064
- Blue Blue #2242C7 ΔE 0.064
- Slate Blue #6A5ACD ΔE 0.067
- Dark Periwinkle #665FD1 ΔE 0.067
Use #3F57BD 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.