#1D55A3
Closest named color: Dusk Blue (#26538D). oklch(45.8% 0.139 257.8), rgb(29, 85, 163).
Aa
White text reads best on this color (7.29:1).
About this color
#1D55A3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.139 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.036 away. White text reads best on it, at 7.29:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.88:1 |
| White text | 7.29:1 |
Values
| HEX | #1D55A3 |
| RGB | rgb(29, 85, 163) |
| HSL | hsl(215, 70%, 38%) |
| OKLCH | oklch(45.8% 0.139 257.8) |
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 #1D55A3 | 7.29:1 | AAA | Lc -89.8 | Fine for body text |
| Black text on #1D55A3 | 2.88:1 | Fails | Lc 19.2 | Dividers and decoration only |
| #1D55A3 text on white | 7.29:1 | AAA | Lc 84.9 | Fine for body text |
| #1D55A3 text on black | 2.88:1 | Fails | Lc -17.1 | Dividers and decoration only |
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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DBF7
oklch(88.5% 0.044 256.8)
-
Step 300
300
#A0C3F5
oklch(80.9% 0.081 257.3)
-
Step 400
400
#6CA2F1
oklch(70.8% 0.13 257.8)
-
Step 500
500
#4288EC
oklch(63.2% 0.166 257.7)
-
Step 600
600
#206FDA
oklch(55.6% 0.18 257.8)
-
Step 700
700
#115CBD
oklch(49.1% 0.168 257.8)
-
Step 800
800 (this color)
#1D55A3
oklch(45.8% 0.139 257.8)
-
Step 900
900
#17407A
oklch(37.7% 0.109 257.8)
-
Step 950
950
#0F2647
oklch(27% 0.068 257.7)
#1D55A3 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) | #295DA6 | 0.026 |
| Deuteranopia (no green cones) | #0051A1 | 0.019 |
| Tritanopia (no blue cones) | #006874 | 0.107 |
| Achromatopsia (no color) | #565656 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D55A3
#1D55A3
oklch(45.8% 0.139 257.8)
- #744F00
#744F00
oklch(45.7% 0.095 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 #1D55A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.036
- Denim Blue #3B5B92 ΔE 0.045
- Cobalt #1E488F ΔE 0.046
- Light Navy Blue #2E5A88 ΔE 0.051
- Light Navy #155084 ΔE 0.052
- Deep Sea Blue #015482 ΔE 0.057
- Dusky Blue #475F94 ΔE 0.060
- Peacock Blue #016795 ΔE 0.060
Use #1D55A3 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.