#0371C5
Closest named color: Mid Blue (#276AB3). oklch(54.2% 0.155 250.7), rgb(3, 113, 197).
Aa
White text reads best on this color (5.03:1).
About this color
#0371C5 is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.155 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.032 away. White text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.17:1 |
| White text | 5.03:1 |
Values
| HEX | #0371C5 |
| RGB | rgb(3, 113, 197) |
| HSL | hsl(206, 97%, 39%) |
| OKLCH | oklch(54.2% 0.155 250.7) |
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 #0371C5 | 5.03:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #0371C5 | 4.17:1 | AA large text | Lc 30.0 | Dividers and decoration only |
| #0371C5 text on white | 5.03:1 | AA | Lc 74.1 | Content text, not long reading |
| #0371C5 text on black | 4.17:1 | AA large text | Lc -27.6 | 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 600.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C7DCF3
oklch(88.6% 0.039 250.7)
-
Step 300
300
#9FC5ED
oklch(81% 0.07 250)
-
Step 400
400
#69A5E4
oklch(70.7% 0.112 250.8)
-
Step 500
500
#3C8DDC
oklch(63.1% 0.143 250.7)
-
Step 600
600 (this color)
#0371C5
oklch(54.2% 0.155 250.7)
-
Step 700
700
#0062AD
oklch(49.1% 0.142 250.8)
-
Step 800
800
#06508D
oklch(42.6% 0.12 250.9)
-
Step 900
900
#134371
oklch(37.7% 0.094 251.1)
-
Step 950
950
#0D2842
oklch(27.1% 0.059 250.2)
#0371C5 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) | #4577C8 | 0.043 |
| Deuteranopia (no green cones) | #2168C3 | 0.024 |
| Tritanopia (no blue cones) | #008591 | 0.112 |
| Achromatopsia (no color) | #6F6F6F | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0371C5
#0371C5
oklch(54.2% 0.155 250.7)
- #996100
#996100
oklch(54.1% 0.117 70.6)
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 #0371C5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.032
- Windows Blue #3778BF ΔE 0.035
- Nice Blue #107AB0 ΔE 0.046
- French Blue #436BAD ΔE 0.048
- Flat Blue #3C73A8 ΔE 0.053
- Royal Blue #4169E1 ΔE 0.060
- Water Blue #0E87CC ΔE 0.062
- Muted Blue #3B719F ΔE 0.064
Use #0371C5 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.