#174F73
Closest named color: Deep Sea Blue (#015482). oklch(41% 0.083 241.6), rgb(23, 79, 115).
Aa
White text reads best on this color (8.74:1).
About this color
#174F73 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.083 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.026 away. White text reads best on it, at 8.74:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.40:1 |
| White text | 8.74:1 |
Values
| HEX | #174F73 |
| RGB | rgb(23, 79, 115) |
| HSL | hsl(203, 67%, 27%) |
| OKLCH | oklch(41% 0.083 241.6) |
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 #174F73 | 8.74:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #174F73 | 2.40:1 | Fails | Lc 14.3 | Not readable |
| #174F73 text on white | 8.74:1 | AAA | Lc 89.6 | Fine for body text |
| #174F73 text on black | 2.40:1 | Fails | Lc -12.6 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEA
oklch(88.5% 0.027 241.2)
-
Step 300
300
#A6C5DE
oklch(80.9% 0.049 242.6)
-
Step 400
400
#74A7CD
oklch(70.7% 0.078 241.4)
-
Step 500
500
#4E91C0
oklch(63.2% 0.099 241.3)
-
Step 600
600
#2E7AAC
oklch(55.6% 0.107 241.5)
-
Step 700
700
#1F6794
oklch(49.2% 0.1 241.1)
-
Step 800
800 (this color)
#174F73
oklch(41% 0.083 241.6)
-
Step 900
900
#1E4561
oklch(37.6% 0.065 242.5)
-
Step 950
950
#132939
oklch(27.1% 0.041 242)
#174F73 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) | #3E5075 | 0.040 |
| Deuteranopia (no green cones) | #324772 | 0.032 |
| Tritanopia (no blue cones) | #00585C | 0.056 |
| Achromatopsia (no color) | #4B4B4B | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #174F73
#174F73
oklch(41% 0.083 241.6)
- #6A3F12
#6A3F12
oklch(41.1% 0.083 62.3)
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 #174F73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.026
- Light Navy #155084 ΔE 0.028
- Twilight Blue #0A437A ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.044
- Dusk Blue #26538D ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.051
- Deep Teal #00555A ΔE 0.053
- Charcoal #264653 ΔE 0.055
Use #174F73 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.