#3F5AB0
Closest named color: Mid Blue (#276AB3). oklch(49.3% 0.14 267.9), rgb(63, 90, 176).
Aa
White text reads best on this color (6.36:1).
About this color
#3F5AB0 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.140 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.044 away. White text reads best on it, at 6.36:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.30:1 |
| White text | 6.36:1 |
Values
| HEX | #3F5AB0 |
| RGB | rgb(63, 90, 176) |
| HSL | hsl(226, 47%, 47%) |
| OKLCH | oklch(49.3% 0.14 267.9) |
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 #3F5AB0 | 6.36:1 | AA | Lc -86.5 | Fine for body text |
| Black text on #3F5AB0 | 3.30:1 | AA large text | Lc 22.7 | Dividers and decoration only |
| #3F5AB0 text on white | 6.36:1 | AA | Lc 81.4 | Fine for body text |
| #3F5AB0 text on black | 3.30:1 | 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
#CED9F3
oklch(88.5% 0.038 267.3)
-
Step 300
300
#AEC0ED
oklch(81% 0.067 267.8)
-
Step 400
400
#839EE5
oklch(70.7% 0.109 267.7)
-
Step 500
500
#6584DD
oklch(63.1% 0.139 267.8)
-
Step 600
600
#4D6CCB
oklch(55.6% 0.151 267.7)
-
Step 700
700 (this color)
#3F5AB0
oklch(49.3% 0.14 267.9)
-
Step 800
800
#344A8E
oklch(42.8% 0.115 267.8)
-
Step 900
900
#2D3E71
oklch(37.7% 0.09 268)
-
Step 950
950
#1A2542
oklch(27% 0.056 266.9)
#3F5AB0 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) | #2D65B3 | 0.031 |
| Deuteranopia (no green cones) | #155AAE | 0.035 |
| Tritanopia (no blue cones) | #006E7C | 0.119 |
| Achromatopsia (no color) | #5F5F5F | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5AB0
#3F5AB0
oklch(49.3% 0.14 267.9)
- #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 #3F5AB0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.044
- French Blue #436BAD ΔE 0.049
- Denim Blue #3B5B92 ΔE 0.050
- Dusky Blue #475F94 ΔE 0.050
- Iris #6258C4 ΔE 0.058
- Twilight #4E518B ΔE 0.062
- Dusk Blue #26538D ΔE 0.066
- Denim #3B638C ΔE 0.068
Use #3F5AB0 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.