#173EBB
Closest named color: Blue Blue (#2242C7). oklch(43% 0.2 264.9), rgb(23, 62, 187).
Aa
White text reads best on this color (8.59:1).
About this color
#173EBB is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.200 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.024 away. White text reads best on it, at 8.59:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.200) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.44:1 |
| White text | 8.59:1 |
Values
| HEX | #173EBB |
| RGB | rgb(23, 62, 187) |
| HSL | hsl(226, 78%, 41%) |
| OKLCH | oklch(43% 0.2 264.9) |
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 #173EBB | 8.59:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #173EBB | 2.44:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #173EBB text on white | 8.59:1 | AAA | Lc 88.6 | Fine for body text |
| #173EBB text on black | 2.44:1 | Fails | Lc -13.6 | Not readable |
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 800.
-
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
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#719CFF
oklch(70.6% 0.153 265)
-
Step 500
500
#4D80FF
oklch(63.2% 0.197 264.8)
-
Step 600
600
#295EFF
oklch(55.5% 0.245 264.9)
-
Step 700
700
#1A48E6
oklch(49.1% 0.241 265)
-
Step 800
800 (this color)
#173EBB
oklch(43% 0.2 264.9)
-
Step 900
900
#173793
oklch(37.8% 0.156 264.9)
-
Step 950
950
#0E2156
oklch(27% 0.099 265.2)
#173EBB 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) | #0054BF | 0.051 |
| Deuteranopia (no green cones) | #0044B9 | 0.014 |
| Tritanopia (no blue cones) | #006077 | 0.152 |
| Achromatopsia (no color) | #4C4C4C | 0.201 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173EBB
#173EBB
oklch(43% 0.2 264.9)
- #664B00
#664B00
oklch(43% 0.088 84.8)
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 #173EBB, closest first.
No curated palette has a color within ΔE 0.04 of #173EBB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.024
- Sapphire #2138AB ΔE 0.030
- Majorelle Blue #3F37C9 ΔE 0.047
- Indigo Blue #3A18B1 ΔE 0.070
- True Blue #010FCC ΔE 0.072
- Blue With A Hint Of Purple #533CC6 ΔE 0.075
- Cobalt #1E488F ΔE 0.076
- Ultramarine Blue #1805DB ΔE 0.077
Use #173EBB 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.