#3F59BA
Closest named color: Mid Blue (#276AB3). oklch(49.8% 0.156 268.8), rgb(63, 89, 186).
Aa
White text reads best on this color (6.26:1).
About this color
#3F59BA is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.156 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.050 away. White text reads best on it, at 6.26:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.34:1 |
| White text | 6.26:1 |
Values
| HEX | #3F59BA |
| RGB | rgb(63, 89, 186) |
| HSL | hsl(227, 49%, 49%) |
| OKLCH | oklch(49.8% 0.156 268.8) |
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 #3F59BA | 6.26:1 | AA | Lc -86.0 | Fine for body text |
| Black text on #3F59BA | 3.34:1 | AA large text | Lc 23.2 | Dividers and decoration only |
| #3F59BA text on white | 6.26:1 | AA | Lc 80.9 | Fine for body text |
| #3F59BA text on black | 3.34:1 | AA large text | Lc -21.0 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CED9F6
oklch(88.6% 0.042 269)
-
Step 300
300
#ACBFF2
oklch(80.8% 0.075 268.8)
-
Step 400
400
#829DEC
oklch(70.8% 0.12 268.9)
-
Step 500
500
#6382E6
oklch(63.1% 0.154 268.7)
-
Step 600
600
#4C69D4
oklch(55.6% 0.168 269)
-
Step 700
700 (this color)
#3F59BA
oklch(49.8% 0.156 268.8)
-
Step 800
800
#324895
oklch(42.8% 0.129 268.5)
-
Step 900
900
#2C3D76
oklch(37.7% 0.099 268.8)
-
Step 950
950
#1A2445
oklch(27% 0.063 269.2)
#3F59BA 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) | #1D66BD | 0.039 |
| Deuteranopia (no green cones) | #005BB8 | 0.040 |
| Tritanopia (no blue cones) | #007081 | 0.129 |
| Achromatopsia (no color) | #606060 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F59BA
#3F59BA
oklch(49.8% 0.156 268.8)
- #7A5F00
#7A5F00
oklch(49.9% 0.102 89.3)
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 #3F59BA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.050
- Iris #6258C4 ΔE 0.050
- Warm Blue #4B57DB ΔE 0.054
- French Blue #436BAD ΔE 0.057
- Denim Blue #3B5B92 ΔE 0.066
- Dusky Blue #475F94 ΔE 0.066
- Dark Periwinkle #665FD1 ΔE 0.067
- Slate Blue #6A5ACD ΔE 0.068
Use #3F59BA 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.