#3F5EC9
Closest named color: Warm Blue (#4B57DB). oklch(51.9% 0.17 267.9), rgb(63, 94, 201).
Aa
White text reads best on this color (5.74:1).
About this color
#3F5EC9 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.170 and its hue 268°. 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 5.74:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.65:1 |
| White text | 5.74:1 |
Values
| HEX | #3F5EC9 |
| RGB | rgb(63, 94, 201) |
| HSL | hsl(227, 56%, 52%) |
| OKLCH | oklch(51.9% 0.17 267.9) |
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 #3F5EC9 | 5.74:1 | AA | Lc -83.6 | Fine for body text |
| Black text on #3F5EC9 | 3.65:1 | AA large text | Lc 25.7 | Dividers and decoration only |
| #3F5EC9 text on white | 5.74:1 | AA | Lc 78.3 | Fine for body text |
| #3F5EC9 text on black | 3.65:1 | AA large text | Lc -23.4 | 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
#CCD9F8
oklch(88.5% 0.045 267.4)
-
Step 300
300
#AABFF7
oklch(80.9% 0.083 268.6)
-
Step 400
400
#7D9CF3
oklch(70.6% 0.132 268.1)
-
Step 500
500
#5E81EE
oklch(63.1% 0.168 268)
-
Step 600
600
#4668DD
oklch(55.7% 0.183 267.8)
-
Step 700
700 (this color)
#3F5EC9
oklch(51.9% 0.17 267.9)
-
Step 800
800
#2E469B
oklch(42.6% 0.142 268)
-
Step 900
900
#293C7B
oklch(37.7% 0.11 268.2)
-
Step 950
950
#182448
oklch(27.1% 0.069 267.8)
#3F5EC9 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) | #116DCD | 0.044 |
| Deuteranopia (no green cones) | #0060C7 | 0.037 |
| Tritanopia (no blue cones) | #00788A | 0.140 |
| Achromatopsia (no color) | #666666 | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5EC9
#3F5EC9
oklch(51.9% 0.17 267.9)
- #826400
#826400
oklch(51.9% 0.106 88)
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 #3F5EC9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.035
- Royal Blue #4169E1 ΔE 0.045
- Iris #6258C4 ΔE 0.046
- Mid Blue #276AB3 ΔE 0.053
- Dark Periwinkle #665FD1 ΔE 0.053
- Neon Blue #4361EE ΔE 0.057
- Slate Blue #6A5ACD ΔE 0.058
- Azul #1D5DEC ΔE 0.059
Use #3F5EC9 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.