#174B9F
Closest named color: Cobalt (#1E488F). oklch(43.1% 0.147 259.9), rgb(23, 75, 159).
Aa
White text reads best on this color (8.25:1).
About this color
#174B9F is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.147 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.027 away. White text reads best on it, at 8.25:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.54:1 |
| White text | 8.25:1 |
Values
| HEX | #174B9F |
| RGB | rgb(23, 75, 159) |
| HSL | hsl(217, 75%, 36%) |
| OKLCH | oklch(43.1% 0.147 259.9) |
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 #174B9F | 8.25:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #174B9F | 2.54:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #174B9F text on white | 8.25:1 | AAA | Lc 88.0 | Fine for body text |
| #174B9F text on black | 2.54:1 | Fails | Lc -14.2 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAF9
oklch(88.4% 0.048 260.2)
-
Step 300
300
#A0C2F9
oklch(80.9% 0.087 259.9)
-
Step 400
400
#6CA0F6
oklch(70.7% 0.138 260)
-
Step 500
500
#4486F2
oklch(63.2% 0.176 259.8)
-
Step 600
600
#246CE1
oklch(55.6% 0.192 260)
-
Step 700
700
#1759C3
oklch(49% 0.178 260.1)
-
Step 800
800 (this color)
#174B9F
oklch(43.1% 0.147 259.9)
-
Step 900
900
#193F7D
oklch(37.8% 0.114 259.8)
-
Step 950
950
#0F2549
oklch(26.9% 0.073 259.8)
#174B9F 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) | #0E55A2 | 0.027 |
| Deuteranopia (no green cones) | #00499D | 0.013 |
| Tritanopia (no blue cones) | #00606D | 0.114 |
| Achromatopsia (no color) | #4E4E4E | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #174B9F
#174B9F
oklch(43.1% 0.147 259.9)
- #694900
#694900
oklch(43% 0.089 79.8)
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 #174B9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.027
- Dusk Blue #26538D ΔE 0.042
- Light Navy #155084 ΔE 0.049
- Sapphire #2138AB ΔE 0.050
- Blueberry #464196 ΔE 0.055
- Deep Sea Blue #015482 ΔE 0.058
- Twilight Blue #0A437A ΔE 0.065
- Denim Blue #3B5B92 ΔE 0.066
Use #174B9F 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.