#0173BD
Closest named color: Mid Blue (#276AB3). oklch(54.1% 0.143 247.4), rgb(1, 115, 189).
Aa
White text reads best on this color (5.01:1).
About this color
#0173BD is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.143 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.028 away. White text reads best on it, at 5.01:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.18:1 |
| White text | 5.01:1 |
Values
| HEX | #0173BD |
| RGB | rgb(1, 115, 189) |
| HSL | hsl(204, 99%, 37%) |
| OKLCH | oklch(54.1% 0.143 247.4) |
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 #0173BD | 5.01:1 | AA | Lc -79.4 | Fine for body text |
| Black text on #0173BD | 4.18:1 | AA large text | Lc 30.1 | Non-text elements, placeholder text |
| #0173BD text on white | 5.01:1 | AA | Lc 74.0 | Content text, not long reading |
| #0173BD text on black | 4.18:1 | AA large text | Lc -27.7 | 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 600.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0EBF6
oklch(93.5% 0.019 248)
-
Step 200
200
#C7DCF0
oklch(88.5% 0.036 246.9)
-
Step 300
300
#A0C5E9
oklch(80.9% 0.065 247.9)
-
Step 400
400
#6AA6DE
oklch(70.7% 0.104 247.9)
-
Step 500
500
#3C8FD5
oklch(63.2% 0.132 247.4)
-
Step 600
600 (this color)
#0173BD
oklch(54.1% 0.143 247.4)
-
Step 700
700
#0064A6
oklch(49.1% 0.131 247.6)
-
Step 800
800
#065288
oklch(42.7% 0.111 247.7)
-
Step 900
900
#13446C
oklch(37.6% 0.086 247.6)
-
Step 950
950
#0D2840
oklch(27% 0.056 248.3)
#0173BD 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) | #4E77C0 | 0.050 |
| Deuteranopia (no green cones) | #3268BC | 0.033 |
| Tritanopia (no blue cones) | #00858F | 0.101 |
| Achromatopsia (no color) | #6F6F6F | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0173BD
#0173BD
oklch(54.1% 0.143 247.4)
- #9C5F00
#9C5F00
oklch(54.1% 0.119 67.3)
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 #0173BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.028
- Windows Blue #3778BF ΔE 0.031
- Nice Blue #107AB0 ΔE 0.032
- Flat Blue #3C73A8 ΔE 0.042
- French Blue #436BAD ΔE 0.042
- Muted Blue #3B719F ΔE 0.052
- Ocean Blue #03719C ΔE 0.052
- Water Blue #0E87CC ΔE 0.059
Use #0173BD 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.