#1D4173
Closest named color: Twilight Blue (#0A437A). oklch(37.7% 0.095 257.2), rgb(29, 65, 115).
Aa
White text reads best on this color (10.21:1).
About this color
#1D4173 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.095 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.016 away. White text reads best on it, at 10.21:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.05:1 |
| White text | 10.21:1 |
Values
| HEX | #1D4173 |
| RGB | rgb(29, 65, 115) |
| HSL | hsl(215, 60%, 28%) |
| OKLCH | oklch(37.7% 0.095 257.2) |
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 #1D4173 | 10.21:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #1D4173 | 2.05:1 | Fails | Lc 10.5 | Not readable |
| #1D4173 text on white | 10.21:1 | AAA | Lc 93.4 | Preferred for body text |
| #1D4173 text on black | 2.05:1 | Fails | Lc -9.1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C9DBF4
oklch(88.6% 0.04 256.6)
-
Step 300
300
#A4C3EF
oklch(81% 0.071 257.1)
-
Step 400
400
#72A2E7
oklch(70.6% 0.114 257.4)
-
Step 500
500
#4B89E0
oklch(63% 0.147 257.2)
-
Step 600
600
#2D71CE
oklch(55.5% 0.159 257.3)
-
Step 700
700
#1F5EB2
oklch(49% 0.148 257.2)
-
Step 800
800
#1C4D90
oklch(42.6% 0.123 257.4)
-
Step 900
900 (this color)
#1D4173
oklch(37.7% 0.095 257.2)
-
Step 950
950
#122643
oklch(26.9% 0.06 257.7)
#1D4173 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) | #294575 | 0.019 |
| Deuteranopia (no green cones) | #1B3D72 | 0.012 |
| Tritanopia (no blue cones) | #004D54 | 0.076 |
| Achromatopsia (no color) | #414141 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D4173
#1D4173
oklch(37.7% 0.095 257.2)
- #583B00
#583B00
oklch(37.6% 0.078 77.7)
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 #1D4173, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.016
- Marine Blue #01386A ΔE 0.039
- Light Navy #155084 ΔE 0.049
- Cobalt #1E488F ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.049
- Prussian Blue #1D3557 ΔE 0.056
- Deep Sea Blue #015482 ΔE 0.057
- Charcoal #264653 ΔE 0.062
Use #1D4173 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.