#3F57A7
Closest named color: Denim Blue (#3B5B92). oklch(48% 0.131 268.5), rgb(63, 87, 167).
Aa
White text reads best on this color (6.70:1).
About this color
#3F57A7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.131 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.038 away. White text reads best on it, at 6.70:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.13:1 |
| White text | 6.70:1 |
Values
| HEX | #3F57A7 |
| RGB | rgb(63, 87, 167) |
| HSL | hsl(226, 45%, 45%) |
| OKLCH | oklch(48% 0.131 268.5) |
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 #3F57A7 | 6.70:1 | AA | Lc -87.9 | Fine for body text |
| Black text on #3F57A7 | 3.13:1 | AA large text | Lc 21.2 | Dividers and decoration only |
| #3F57A7 text on white | 6.70:1 | AA | Lc 82.8 | Fine for body text |
| #3F57A7 text on black | 3.13:1 | AA large text | Lc -19.1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF7
oklch(93.7% 0.018 269.1)
-
Step 200
200
#CFD9F1
oklch(88.5% 0.035 267.6)
-
Step 300
300
#AFC0EB
oklch(80.9% 0.064 268.1)
-
Step 400
400
#869EE1
oklch(70.7% 0.102 268.6)
-
Step 500
500
#6984D8
oklch(63% 0.13 269)
-
Step 600
600
#516DC5
oklch(55.7% 0.14 268.3)
-
Step 700
700 (this color)
#3F57A7
oklch(48% 0.131 268.5)
-
Step 800
800
#364A8A
oklch(42.7% 0.109 268.5)
-
Step 900
900
#2F3E6E
oklch(37.6% 0.085 269)
-
Step 950
950
#1B2541
oklch(27% 0.054 267.8)
#3F57A7 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) | #2F61AA | 0.029 |
| Deuteranopia (no green cones) | #1D57A5 | 0.032 |
| Tritanopia (no blue cones) | #006977 | 0.112 |
| Achromatopsia (no color) | #5C5C5C | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F57A7
#3F57A7
oklch(48% 0.131 268.5)
- #745A00
#745A00
oklch(48.1% 0.098 89.1)
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 #3F57A7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.038
- Dusky Blue #475F94 ΔE 0.043
- Twilight #4E518B ΔE 0.048
- Dusk Blue #26538D ΔE 0.052
- Mid Blue #276AB3 ΔE 0.053
- French Blue #436BAD ΔE 0.056
- Light Navy Blue #2E5A88 ΔE 0.057
- Blueberry #464196 ΔE 0.060
Use #3F57A7 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.