#3F59BF
Closest named color: Warm Blue (#4B57DB). oklch(50.2% 0.163 269), rgb(63, 89, 191).
Aa
White text reads best on this color (6.18:1).
About this color
#3F59BF is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.163 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.047 away. White text reads best on it, at 6.18:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.39:1 |
| White text | 6.18:1 |
Values
| HEX | #3F59BF |
| RGB | rgb(63, 89, 191) |
| HSL | hsl(228, 50%, 50%) |
| OKLCH | oklch(50.2% 0.163 269) |
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 #3F59BF | 6.18:1 | AA | Lc -85.7 | Fine for body text |
| Black text on #3F59BF | 3.39:1 | AA large text | Lc 23.6 | Dividers and decoration only |
| #3F59BF text on white | 6.18:1 | AA | Lc 80.5 | Fine for body text |
| #3F59BF text on black | 3.39:1 | AA large text | Lc -21.3 | 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
#E3EAFA
oklch(93.6% 0.023 266.9)
-
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
#819CEF
oklch(70.7% 0.126 269.3)
-
Step 500
500
#6281EA
oklch(63.1% 0.161 269)
-
Step 600
600
#4B68D8
oklch(55.6% 0.175 269.1)
-
Step 700
700 (this color)
#3F59BF
oklch(50.2% 0.163 269)
-
Step 800
800
#324798
oklch(42.8% 0.135 269.1)
-
Step 900
900
#2B3C79
oklch(37.7% 0.106 269.1)
-
Step 950
950
#192447
oklch(27.1% 0.067 268.5)
#3F59BF 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) | #1267C3 | 0.043 |
| Deuteranopia (no green cones) | #005BBD | 0.040 |
| Tritanopia (no blue cones) | #007183 | 0.134 |
| Achromatopsia (no color) | #616161 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F59BF
#3F59BF
oklch(50.2% 0.163 269)
- #7B6000
#7B6000
oklch(50.2% 0.103 89.4)
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 #3F59BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.047
- Iris #6258C4 ΔE 0.048
- Mid Blue #276AB3 ΔE 0.053
- French Blue #436BAD ΔE 0.060
- Dark Periwinkle #665FD1 ΔE 0.063
- Royal Blue #4169E1 ΔE 0.064
- Slate Blue #6A5ACD ΔE 0.064
- Blue With A Hint Of Purple #533CC6 ΔE 0.067
Use #3F59BF 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.