#3665A8
Closest named color: Mid Blue (#276AB3). oklch(50.7% 0.119 257.5), rgb(54, 101, 168).
Aa
White text reads best on this color (5.85:1).
About this color
#3665A8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.119 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.021 away. White text reads best on it, at 5.85:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.58:1 |
| White text | 5.85:1 |
Values
| HEX | #3665A8 |
| RGB | rgb(54, 101, 168) |
| HSL | hsl(215, 51%, 44%) |
| OKLCH | oklch(50.7% 0.119 257.5) |
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 #3665A8 | 5.85:1 | AA | Lc -84.3 | Fine for body text |
| Black text on #3665A8 | 3.58:1 | AA large text | Lc 25.0 | Dividers and decoration only |
| #3665A8 text on white | 5.85:1 | AA | Lc 79.1 | Fine for body text |
| #3665A8 text on black | 3.58:1 | AA large text | Lc -22.7 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CCDAEF
oklch(88.4% 0.033 258.4)
-
Step 300
300
#AAC2E6
oklch(80.8% 0.057 258.4)
-
Step 400
400
#7CA2DA
oklch(70.6% 0.093 257.9)
-
Step 500
500
#5A8AD0
oklch(63% 0.118 257.8)
-
Step 600
600
#4073BD
oklch(55.6% 0.128 257.8)
-
Step 700
700 (this color)
#3665A8
oklch(50.7% 0.119 257.5)
-
Step 800
800
#2A4F84
oklch(42.8% 0.098 257.6)
-
Step 900
900
#26426A
oklch(37.8% 0.077 257.4)
-
Step 950
950
#17273E
oklch(27.1% 0.048 257.5)
#3665A8 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) | #476AAB | 0.025 |
| Deuteranopia (no green cones) | #3660A7 | 0.014 |
| Tritanopia (no blue cones) | #00747E | 0.095 |
| Achromatopsia (no color) | #656565 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3665A8
#3665A8
oklch(50.7% 0.119 257.5)
- #865C00
#865C00
oklch(50.7% 0.106 77.8)
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 #3665A8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.021
- French Blue #436BAD ΔE 0.024
- Dusky Blue #475F94 ΔE 0.035
- Denim Blue #3B5B92 ΔE 0.041
- Muted Blue #3B719F ΔE 0.041
- Flat Blue #3C73A8 ΔE 0.042
- Denim #3B638C ΔE 0.044
- Peacock Blue #016795 ΔE 0.045
Use #3665A8 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.