#0371BF
Closest named color: Mid Blue (#276AB3). oklch(53.8% 0.148 249.1), rgb(3, 113, 191).
Aa
White text reads best on this color (5.09:1).
About this color
#0371BF is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.148 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.025 away. White text reads best on it, at 5.09:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.11:1 |
| White text | 5.09:1 |
Values
| HEX | #0371BF |
| RGB | rgb(3, 113, 191) |
| HSL | hsl(205, 97%, 38%) |
| OKLCH | oklch(53.8% 0.148 249.1) |
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 #0371BF | 5.09:1 | AA | Lc -79.9 | Fine for body text |
| Black text on #0371BF | 4.11:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #0371BF text on white | 5.09:1 | AA | Lc 74.5 | Content text, not long reading |
| #0371BF text on black | 4.11:1 | AA large text | Lc -27.2 | 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 600.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C7DCF1
oklch(88.5% 0.037 248.2)
-
Step 300
300
#A0C5EA
oklch(80.9% 0.066 248.6)
-
Step 400
400
#6AA6E0
oklch(70.8% 0.106 248.7)
-
Step 500
500
#3D8ED8
oklch(63.1% 0.137 249.2)
-
Step 600
600 (this color)
#0371BF
oklch(53.8% 0.148 249.1)
-
Step 700
700
#0063A9
oklch(49% 0.136 249.1)
-
Step 800
800
#08518A
oklch(42.7% 0.114 249.4)
-
Step 900
900
#13446E
oklch(37.7% 0.088 248.7)
-
Step 950
950
#0D2841
oklch(27% 0.057 249.3)
#0371BF 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) | #4976C2 | 0.046 |
| Deuteranopia (no green cones) | #2B67BD | 0.028 |
| Tritanopia (no blue cones) | #00848E | 0.107 |
| Achromatopsia (no color) | #6E6E6E | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0371BF
#0371BF
oklch(53.8% 0.148 249.1)
- #995F00
#995F00
oklch(53.7% 0.117 68.9)
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 #0371BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.025
- Windows Blue #3778BF ΔE 0.034
- Nice Blue #107AB0 ΔE 0.039
- French Blue #436BAD ΔE 0.043
- Flat Blue #3C73A8 ΔE 0.046
- Muted Blue #3B719F ΔE 0.056
- Ocean Blue #03719C ΔE 0.056
- Water Blue #0E87CC ΔE 0.063
Use #0371BF 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.