#376BCB
Closest named color: Royal Blue (#4169E1). oklch(54.4% 0.159 261.4), rgb(55, 107, 203).
Aa
White text reads best on this color (5.08:1).
About this color
#376BCB is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.159 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.036 away. White text reads best on it, at 5.08:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.12:1 |
| White text | 5.08:1 |
Values
| HEX | #376BCB |
| RGB | rgb(55, 107, 203) |
| HSL | hsl(219, 59%, 51%) |
| OKLCH | oklch(54.4% 0.159 261.4) |
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 #376BCB | 5.08:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #376BCB | 4.12:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #376BCB text on white | 5.08:1 | AA | Lc 74.7 | Content text, not long reading |
| #376BCB text on black | 4.12:1 | AA large text | Lc -27.0 | 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 600.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CBDAF4
oklch(88.5% 0.039 261.5)
-
Step 300
300
#A7C2F0
oklch(81% 0.072 261)
-
Step 400
400
#78A0E8
oklch(70.6% 0.115 261.6)
-
Step 500
500
#5587E1
oklch(63.1% 0.146 261.3)
-
Step 600
600 (this color)
#376BCB
oklch(54.4% 0.159 261.4)
-
Step 700
700
#2D5CB3
oklch(49.1% 0.148 261.4)
-
Step 800
800
#264C91
oklch(42.8% 0.122 261.2)
-
Step 900
900
#234074
oklch(37.8% 0.096 261.1)
-
Step 950
950
#152644
oklch(27.1% 0.061 261)
#376BCB 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) | #3775CF | 0.027 |
| Deuteranopia (no green cones) | #0E68C9 | 0.027 |
| Tritanopia (no blue cones) | #008291 | 0.127 |
| Achromatopsia (no color) | #6E6E6E | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #376BCB
#376BCB
oklch(54.4% 0.159 261.4)
- #916800
#916800
oklch(54.5% 0.113 81.4)
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 #376BCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.036
- Mid Blue #276AB3 ΔE 0.041
- Windows Blue #3778BF ΔE 0.043
- French Blue #436BAD ΔE 0.048
- Cerulean Blue #056EEE ΔE 0.056
- Warm Blue #4B57DB ΔE 0.057
- Dark Periwinkle #665FD1 ΔE 0.061
- Neon Blue #4361EE ΔE 0.061
Use #376BCB 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.