#174E73
Closest named color: Deep Sea Blue (#015482). oklch(40.7% 0.084 242.7), rgb(23, 78, 115).
Aa
White text reads best on this color (8.84:1).
About this color
#174E73 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.084 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.028 away. White text reads best on it, at 8.84:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.37:1 |
| White text | 8.84:1 |
Values
| HEX | #174E73 |
| RGB | rgb(23, 78, 115) |
| HSL | hsl(204, 67%, 27%) |
| OKLCH | oklch(40.7% 0.084 242.7) |
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 #174E73 | 8.84:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #174E73 | 2.37:1 | Fails | Lc 14.0 | Not readable |
| #174E73 text on white | 8.84:1 | AAA | Lc 89.9 | Fine for body text |
| #174E73 text on black | 2.37:1 | Fails | Lc -12.3 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
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
#75A7CE
oklch(70.8% 0.078 242.6)
-
Step 500
500
#4E90C1
oklch(63% 0.1 242.7)
-
Step 600
600
#2F7AAD
oklch(55.7% 0.108 242.2)
-
Step 700
700
#206695
oklch(49% 0.101 242.8)
-
Step 800
800 (this color)
#174E73
oklch(40.7% 0.084 242.7)
-
Step 900
900
#1F4561
oklch(37.6% 0.065 243)
-
Step 950
950
#132939
oklch(27.1% 0.041 242)
#174E73 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) | #3D4F75 | 0.040 |
| Deuteranopia (no green cones) | #304672 | 0.031 |
| Tritanopia (no blue cones) | #00575B | 0.058 |
| Achromatopsia (no color) | #4A4A4A | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #174E73
#174E73
oklch(40.7% 0.084 242.7)
- #693E0F
#693E0F
oklch(40.7% 0.084 62.8)
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 #174E73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.028
- Light Navy #155084 ΔE 0.028
- Twilight Blue #0A437A ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.043
- Dusk Blue #26538D ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.053
- Cobalt #1E488F ΔE 0.054
- Charcoal #264653 ΔE 0.054
Use #174E73 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.