#174D8F
Closest named color: Cobalt (#1E488F). oklch(42.3% 0.123 255.9), rgb(23, 77, 143).
Aa
White text reads best on this color (8.41:1).
About this color
#174D8F is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.123 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.014 away. White text reads best on it, at 8.41:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.49:1 |
| White text | 8.41:1 |
Values
| HEX | #174D8F |
| RGB | rgb(23, 77, 143) |
| HSL | hsl(213, 72%, 33%) |
| OKLCH | oklch(42.3% 0.123 255.9) |
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 #174D8F | 8.41:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #174D8F | 2.49:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #174D8F text on white | 8.41:1 | AAA | Lc 88.6 | Fine for body text |
| #174D8F text on black | 2.49:1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A3C3EF
oklch(80.9% 0.072 256.4)
-
Step 400
400
#70A3E7
oklch(70.8% 0.114 255.9)
-
Step 500
500
#488AE0
oklch(63.1% 0.147 256)
-
Step 600
600
#2772CE
oklch(55.6% 0.16 255.9)
-
Step 700
700
#1A5FB2
oklch(49.1% 0.148 256)
-
Step 800
800 (this color)
#174D8F
oklch(42.3% 0.123 255.9)
-
Step 900
900
#1B4273
oklch(37.8% 0.095 255.6)
-
Step 950
950
#112743
oklch(27.1% 0.059 255.4)
#174D8F 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) | #2A5392 | 0.025 |
| Deuteranopia (no green cones) | #0E488E | 0.016 |
| Tritanopia (no blue cones) | #005D67 | 0.093 |
| Achromatopsia (no color) | #4D4D4D | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #174D8F
#174D8F
oklch(42.3% 0.123 255.9)
- #694600
#694600
oklch(42.3% 0.089 76.3)
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 #174D8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.014
- Light Navy #155084 ΔE 0.022
- Dusk Blue #26538D ΔE 0.023
- Deep Sea Blue #015482 ΔE 0.033
- Twilight Blue #0A437A ΔE 0.045
- Light Navy Blue #2E5A88 ΔE 0.049
- Denim Blue #3B5B92 ΔE 0.057
- Blueberry #464196 ΔE 0.059
Use #174D8F 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.