#173FF5
Closest named color: Vibrant Blue (#0339F8). oklch(49.2% 0.268 265.3), rgb(23, 63, 245).
Aa
White text reads best on this color (6.84:1).
About this color
#173FF5 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.268 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Vibrant Blue (#0339F8), ΔE 0.014 away. White text reads best on it, at 6.84:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.268) |
| Temperature | cool |
| Nearest name | Vibrant Blue (#0339F8) |
| Black text | 3.06:1 |
| White text | 6.84:1 |
Values
| HEX | #173FF5 |
| RGB | rgb(23, 63, 245) |
| HSL | hsl(229, 92%, 53%) |
| OKLCH | oklch(49.2% 0.268 265.3) |
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 #173FF5 | 6.84:1 | AA | Lc -87.3 | Fine for body text |
| Black text on #173FF5 | 3.06:1 | AA large text | Lc 21.9 | Dividers and decoration only |
| #173FF5 text on white | 6.84:1 | AA | Lc 82.2 | Fine for body text |
| #173FF5 text on black | 3.06:1 | AA large text | Lc -19.7 | 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 700.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C7D9FF
oklch(88.4% 0.056 265.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#729CFF
oklch(70.6% 0.153 265.4)
-
Step 500
500
#4E7FFF
oklch(63% 0.198 265.3)
-
Step 600
600
#2C5EFF
oklch(55.6% 0.244 265.3)
-
Step 700
700 (this color)
#173FF5
oklch(49.2% 0.268 265.3)
-
Step 800
800
#1336C5
oklch(42.6% 0.222 265.3)
-
Step 900
900
#14339B
oklch(37.7% 0.172 265.3)
-
Step 950
950
#0C1F5B
oklch(26.9% 0.11 265.7)
#173FF5 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) | #0065FA | 0.075 |
| Deuteranopia (no green cones) | #004FF2 | 0.028 |
| Tritanopia (no blue cones) | #007698 | 0.202 |
| Achromatopsia (no color) | #5A5A5A | 0.269 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173FF5
#173FF5
oklch(49.2% 0.268 265.3)
- #7B5C00
#7B5C00
oklch(49.3% 0.101 85.6)
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 #173FF5, closest first.
No curated palette has a color within ΔE 0.04 of #173FF5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vibrant Blue #0339F8 ΔE 0.014
- Vivid Blue #152EFF ΔE 0.026
- Light Royal Blue #3A2EFE ΔE 0.034
- Electric Blue #0652FF ΔE 0.039
- Rich Blue #021BF9 ΔE 0.048
- Strong Blue #0C06F7 ΔE 0.059
- Primary Blue #0804F9 ΔE 0.059
- Azul #1D5DEC ΔE 0.061
Use #173FF5 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.