#3F59C7
Closest named color: Warm Blue (#4B57DB). oklch(50.8% 0.174 269.3), rgb(63, 89, 199).
Aa
White text reads best on this color (6.06:1).
About this color
#3F59C7 is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.174 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.035 away. White text reads best on it, at 6.06:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.174) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.46:1 |
| White text | 6.06:1 |
Values
| HEX | #3F59C7 |
| RGB | rgb(63, 89, 199) |
| HSL | hsl(229, 55%, 51%) |
| OKLCH | oklch(50.8% 0.174 269.3) |
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 #3F59C7 | 6.06:1 | AA | Lc -85.1 | Fine for body text |
| Black text on #3F59C7 | 3.46:1 | AA large text | Lc 24.2 | Dividers and decoration only |
| #3F59C7 text on white | 6.06:1 | AA | Lc 79.9 | Fine for body text |
| #3F59C7 text on black | 3.46:1 | AA large text | Lc -22.0 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD9F9
oklch(88.6% 0.046 267.9)
-
Step 300
300
#ABBFF8
oklch(81% 0.084 269.5)
-
Step 400
400
#7F9BF4
oklch(70.6% 0.134 269.5)
-
Step 500
500
#6080F0
oklch(63.1% 0.171 269.1)
-
Step 600
600
#4966DF
oklch(55.6% 0.187 269.3)
-
Step 700
700 (this color)
#3F59C7
oklch(50.8% 0.174 269.3)
-
Step 800
800
#30459C
oklch(42.6% 0.144 269.2)
-
Step 900
900
#2A3B7C
oklch(37.6% 0.112 269.4)
-
Step 950
950
#192349
oklch(27% 0.072 270)
#3F59C7 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) | #0069CB | 0.048 |
| Deuteranopia (no green cones) | #005CC5 | 0.039 |
| Tritanopia (no blue cones) | #007487 | 0.143 |
| Achromatopsia (no color) | #626262 | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F59C7
#3F59C7
oklch(50.8% 0.174 269.3)
- #7D6100
#7D6100
oklch(50.7% 0.104 88.9)
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 #3F59C7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.035
- Iris #6258C4 ΔE 0.047
- Royal Blue #4169E1 ΔE 0.055
- Dark Periwinkle #665FD1 ΔE 0.059
- Mid Blue #276AB3 ΔE 0.059
- Slate Blue #6A5ACD ΔE 0.061
- Azul #1D5DEC ΔE 0.062
- Neon Blue #4361EE ΔE 0.063
Use #3F59C7 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.