#375DB3
Closest named color: Mid Blue (#276AB3). oklch(49.7% 0.143 264), rgb(55, 93, 179).
Aa
White text reads best on this color (6.21:1).
About this color
#375DB3 is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.143 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.036 away. White text reads best on it, at 6.21:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.37:1 |
| White text | 6.21:1 |
Values
| HEX | #375DB3 |
| RGB | rgb(55, 93, 179) |
| HSL | hsl(222, 53%, 46%) |
| OKLCH | oklch(49.7% 0.143 264) |
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 #375DB3 | 6.21:1 | AA | Lc -85.8 | Fine for body text |
| Black text on #375DB3 | 3.37:1 | AA large text | Lc 23.4 | Dividers and decoration only |
| #375DB3 text on white | 6.21:1 | AA | Lc 80.7 | Fine for body text |
| #375DB3 text on black | 3.37:1 | AA large text | Lc -21.2 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#AAC1EE
oklch(80.9% 0.069 263.7)
-
Step 400
400
#7D9FE6
oklch(70.6% 0.111 264.2)
-
Step 500
500
#5D86DF
oklch(63.2% 0.142 264.1)
-
Step 600
600
#436ECC
oklch(55.6% 0.153 263.7)
-
Step 700
700 (this color)
#375DB3
oklch(49.7% 0.143 264)
-
Step 800
800
#2C4B8F
oklch(42.7% 0.118 263.7)
-
Step 900
900
#283F72
oklch(37.7% 0.092 264.2)
-
Step 950
950
#172543
oklch(26.9% 0.059 264)
#375DB3 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) | #2F67B6 | 0.027 |
| Deuteranopia (no green cones) | #115BB1 | 0.029 |
| Tritanopia (no blue cones) | #00717F | 0.117 |
| Achromatopsia (no color) | #616161 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #375DB3
#375DB3
oklch(49.7% 0.143 264)
- #7E5C00
#7E5C00
oklch(49.7% 0.102 83.4)
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 #375DB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.036
- French Blue #436BAD ΔE 0.045
- Denim Blue #3B5B92 ΔE 0.052
- Dusky Blue #475F94 ΔE 0.053
- Iris #6258C4 ΔE 0.063
- Peacock Blue #016795 ΔE 0.067
- Flat Blue #3C73A8 ΔE 0.068
- Dusk Blue #26538D ΔE 0.069
Use #375DB3 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.