#3661A9
Closest named color: Mid Blue (#276AB3). oklch(49.9% 0.125 260.1), rgb(54, 97, 169).
Aa
White text reads best on this color (6.10:1).
About this color
#3661A9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.125 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.027 away. White text reads best on it, at 6.10:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.43:1 |
| White text | 6.10:1 |
Values
| HEX | #3661A9 |
| RGB | rgb(54, 97, 169) |
| HSL | hsl(218, 52%, 44%) |
| OKLCH | oklch(49.9% 0.125 260.1) |
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 #3661A9 | 6.10:1 | AA | Lc -85.4 | Fine for body text |
| Black text on #3661A9 | 3.43:1 | AA large text | Lc 23.8 | Dividers and decoration only |
| #3661A9 text on white | 6.10:1 | AA | Lc 80.2 | Fine for body text |
| #3661A9 text on black | 3.43:1 | AA large text | Lc -21.6 | 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
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CDDAF0
oklch(88.5% 0.033 261)
-
Step 300
300
#AAC2E8
oklch(80.9% 0.06 259.5)
-
Step 400
400
#7DA1DD
oklch(70.6% 0.097 260.4)
-
Step 500
500
#5C89D4
oklch(63.1% 0.124 260.1)
-
Step 600
600
#4271C1
oklch(55.5% 0.135 260.4)
-
Step 700
700 (this color)
#3661A9
oklch(49.9% 0.125 260.1)
-
Step 800
800
#2B4E87
oklch(42.8% 0.103 259.7)
-
Step 900
900
#27416C
oklch(37.7% 0.081 260)
-
Step 950
950
#17263F
oklch(26.9% 0.051 260.2)
#3661A9 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) | #3F68AC | 0.023 |
| Deuteranopia (no green cones) | #2D5DA8 | 0.015 |
| Tritanopia (no blue cones) | #00727D | 0.101 |
| Achromatopsia (no color) | #626262 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3661A9
#3661A9
oklch(49.9% 0.125 260.1)
- #815B00
#815B00
oklch(49.8% 0.103 80.3)
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 #3661A9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.027
- French Blue #436BAD ΔE 0.033
- Dusky Blue #475F94 ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.038
- Denim #3B638C ΔE 0.049
- Peacock Blue #016795 ΔE 0.049
- Muted Blue #3B719F ΔE 0.053
- Flat Blue #3C73A8 ΔE 0.053
Use #3661A9 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.