#3F59B3
Closest named color: Mid Blue (#276AB3). oklch(49.3% 0.146 268.5), rgb(63, 89, 179).
Aa
White text reads best on this color (6.38:1).
About this color
#3F59B3 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.146 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.047 away. White text reads best on it, at 6.38:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.29:1 |
| White text | 6.38:1 |
Values
| HEX | #3F59B3 |
| RGB | rgb(63, 89, 179) |
| HSL | hsl(227, 48%, 47%) |
| OKLCH | oklch(49.3% 0.146 268.5) |
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 #3F59B3 | 6.38:1 | AA | Lc -86.5 | Fine for body text |
| Black text on #3F59B3 | 3.29:1 | AA large text | Lc 22.6 | Dividers and decoration only |
| #3F59B3 text on white | 6.38:1 | AA | Lc 81.4 | Fine for body text |
| #3F59B3 text on black | 3.29:1 | AA large text | Lc -20.5 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CED9F4
oklch(88.5% 0.039 267.9)
-
Step 300
300
#ADC0EF
oklch(81% 0.07 267.6)
-
Step 400
400
#839DE7
oklch(70.6% 0.113 268.7)
-
Step 500
500
#6583E0
oklch(63% 0.144 268.6)
-
Step 600
600
#4D6BCE
oklch(55.6% 0.156 268.3)
-
Step 700
700 (this color)
#3F59B3
oklch(49.3% 0.146 268.5)
-
Step 800
800
#344990
oklch(42.8% 0.12 268.6)
-
Step 900
900
#2D3E73
oklch(37.8% 0.093 268.3)
-
Step 950
950
#1A2443
oklch(26.9% 0.06 268.7)
#3F59B3 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) | #2765B6 | 0.035 |
| Deuteranopia (no green cones) | #055AB1 | 0.040 |
| Tritanopia (no blue cones) | #006E7D | 0.123 |
| Achromatopsia (no color) | #5F5F5F | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F59B3
#3F59B3
oklch(49.3% 0.146 268.5)
- #795D00
#795D00
oklch(49.3% 0.101 88.1)
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 #3F59B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.047
- French Blue #436BAD ΔE 0.053
- Denim Blue #3B5B92 ΔE 0.055
- Iris #6258C4 ΔE 0.055
- Dusky Blue #475F94 ΔE 0.056
- Warm Blue #4B57DB ΔE 0.065
- Twilight #4E518B ΔE 0.066
- Dusk Blue #26538D ΔE 0.070
Use #3F59B3 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.