#174F71
Closest named color: Deep Sea Blue (#015482). oklch(40.9% 0.08 240.1), rgb(23, 79, 113).
Aa
White text reads best on this color (8.77:1).
About this color
#174F71 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.080 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.029 away. White text reads best on it, at 8.77:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.39:1 |
| White text | 8.77:1 |
Values
| HEX | #174F71 |
| RGB | rgb(23, 79, 113) |
| HSL | hsl(203, 66%, 27%) |
| OKLCH | oklch(40.9% 0.08 240.1) |
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 #174F71 | 8.77:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #174F71 | 2.39:1 | Fails | Lc 14.2 | Not readable |
| #174F71 text on white | 8.77:1 | AAA | Lc 89.7 | Fine for body text |
| #174F71 text on black | 2.39:1 | Fails | Lc -12.5 | 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
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CADCE9
oklch(88.5% 0.026 239.1)
-
Step 300
300
#A6C5DC
oklch(80.8% 0.047 240.3)
-
Step 400
400
#75A7CB
oklch(70.6% 0.075 240.4)
-
Step 500
500
#4E91BE
oklch(63.1% 0.096 240.1)
-
Step 600
600
#2E7AAA
oklch(55.5% 0.105 240.4)
-
Step 700
700
#206792
oklch(49.1% 0.097 240.1)
-
Step 800
800 (this color)
#174F71
oklch(40.9% 0.08 240.1)
-
Step 900
900
#1E465F
oklch(37.7% 0.062 238.9)
-
Step 950
950
#132938
oklch(27% 0.04 240.2)
#174F71 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) | #3F4F73 | 0.042 |
| Deuteranopia (no green cones) | #334770 | 0.033 |
| Tritanopia (no blue cones) | #00585B | 0.055 |
| Achromatopsia (no color) | #4B4B4B | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #174F71
#174F71
oklch(40.9% 0.08 240.1)
- #693E16
#693E16
oklch(40.8% 0.08 59.9)
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 #174F71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.029
- Light Navy #155084 ΔE 0.032
- Dark Grey Blue #29465B ΔE 0.041
- Twilight Blue #0A437A ΔE 0.045
- Dusk Blue #26538D ΔE 0.050
- Deep Teal #00555A ΔE 0.050
- Charcoal #264653 ΔE 0.052
- Light Navy Blue #2E5A88 ΔE 0.053
Use #174F71 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.