#173D52
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.3% 0.056 236), rgb(23, 61, 82).
Aa
White text reads best on this color (11.50:1).
About this color
#173D52 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.056 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.011 away. White text reads best on it, at 11.50:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.82:1 |
| White text | 11.50:1 |
Values
| HEX | #173D52 |
| RGB | rgb(23, 61, 82) |
| HSL | hsl(201, 56%, 21%) |
| OKLCH | oklch(34.3% 0.056 236) |
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 #173D52 | 11.50:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #173D52 | 1.82:1 | Fails | Lc 7.6 | Not readable |
| #173D52 text on white | 11.50:1 | AAA | Lc 96.3 | Preferred for body text |
| #173D52 text on black | 1.82:1 | Fails | Lc 0.0 | 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 900.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CBDCE7
oklch(88.5% 0.024 236)
-
Step 300
300
#A7C6D9
oklch(81% 0.043 235)
-
Step 400
400
#77A8C5
oklch(70.7% 0.067 235)
-
Step 500
500
#5292B7
oklch(63.2% 0.086 235.7)
-
Step 600
600
#337BA3
oklch(55.5% 0.094 236.4)
-
Step 700
700
#25688B
oklch(49.1% 0.087 235.4)
-
Step 800
800
#205571
oklch(42.7% 0.072 235.2)
-
Step 900
900 (this color)
#173D52
oklch(34.3% 0.056 236)
-
Step 950
950
#142936
oklch(27% 0.036 237.4)
#173D52 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) | #333D53 | 0.034 |
| Deuteranopia (no green cones) | #2B3752 | 0.028 |
| Tritanopia (no blue cones) | #004244 | 0.037 |
| Achromatopsia (no color) | #393939 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #173D52
#173D52
oklch(34.3% 0.056 236)
- #4F311A
#4F311A
oklch(34.4% 0.056 57)
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 #173D52, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.011
- Midnight Green #073B4C ΔE 0.017
- Prussian Blue #1D3557 ΔE 0.030
- Charcoal #264653 ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.039
- Gunmetal #293241 ΔE 0.042
- Onyx #343A40 ΔE 0.044
- Marine Blue #01386A ΔE 0.050
Use #173D52 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.