#3759BB
Closest named color: Mid Blue (#276AB3). oklch(49.5% 0.159 266.2), rgb(55, 89, 187).
Aa
White text reads best on this color (6.34:1).
About this color
#3759BB is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.159 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.049 away. White text reads best on it, at 6.34:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.30:1 |
| White text | 6.34:1 |
Values
| HEX | #3759BB |
| RGB | rgb(55, 89, 187) |
| HSL | hsl(225, 55%, 47%) |
| OKLCH | oklch(49.5% 0.159 266.2) |
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 #3759BB | 6.34:1 | AA | Lc -86.3 | Fine for body text |
| Black text on #3759BB | 3.30:1 | AA large text | Lc 22.9 | Dividers and decoration only |
| #3759BB text on white | 6.34:1 | AA | Lc 81.2 | Fine for body text |
| #3759BB text on black | 3.30:1 | AA large text | Lc -20.7 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F6
oklch(88.5% 0.042 266.3)
-
Step 300
300
#A9C0F3
oklch(80.8% 0.077 265.8)
-
Step 400
400
#7D9EEE
oklch(70.8% 0.123 266.3)
-
Step 500
500
#5D83E8
oklch(63.1% 0.158 266.4)
-
Step 600
600
#446AD6
oklch(55.5% 0.171 266.3)
-
Step 700
700 (this color)
#3759BB
oklch(49.5% 0.159 266.2)
-
Step 800
800
#2D4896
oklch(42.6% 0.132 266.4)
-
Step 900
900
#283D78
oklch(37.6% 0.104 266.7)
-
Step 950
950
#172446
oklch(26.9% 0.066 266.3)
#3759BB 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) | #1866BE | 0.036 |
| Deuteranopia (no green cones) | #005AB9 | 0.032 |
| Tritanopia (no blue cones) | #007081 | 0.128 |
| Achromatopsia (no color) | #5F5F5F | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3759BB
#3759BB
oklch(49.5% 0.159 266.2)
- #7B5D00
#7B5D00
oklch(49.5% 0.101 86.6)
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 #3759BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.049
- Warm Blue #4B57DB ΔE 0.056
- Iris #6258C4 ΔE 0.058
- French Blue #436BAD ΔE 0.060
- Blue Blue #2242C7 ΔE 0.065
- Denim Blue #3B5B92 ΔE 0.067
- Dusky Blue #475F94 ΔE 0.069
- Royal Blue #4169E1 ΔE 0.071
Use #3759BB 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.