#1D3A7B
Closest named color: Twilight Blue (#0A437A). oklch(36.6% 0.116 263.6), rgb(29, 58, 123).
Aa
White text reads best on this color (10.80:1).
About this color
#1D3A7B is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.116 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.027 away. White text reads best on it, at 10.80:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.80:1 |
Values
| HEX | #1D3A7B |
| RGB | rgb(29, 58, 123) |
| HSL | hsl(221, 62%, 30%) |
| OKLCH | oklch(36.6% 0.116 263.6) |
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 #1D3A7B | 10.80:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #1D3A7B | 1.94:1 | Fails | Lc 9.2 | Not readable |
| #1D3A7B text on white | 10.80:1 | AAA | Lc 94.7 | Preferred for body text |
| #1D3A7B text on black | 1.94:1 | Fails | Lc -7.9 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C9DAFA
oklch(88.6% 0.048 263.1)
-
Step 300
300
#A4C1FA
oklch(81% 0.087 263.6)
-
Step 400
400
#739EF7
oklch(70.7% 0.139 263.7)
-
Step 500
500
#4F83F4
oklch(63.1% 0.178 263.5)
-
Step 600
600
#3469E3
oklch(55.6% 0.194 263.6)
-
Step 700
700
#2757C5
oklch(49.2% 0.18 263.4)
-
Step 800
800
#21489F
oklch(42.8% 0.149 263.3)
-
Step 900
900 (this color)
#1D3A7B
oklch(36.6% 0.116 263.6)
-
Step 950
950
#13244A
oklch(26.9% 0.074 264)
#1D3A7B 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) | #12427D | 0.023 |
| Deuteranopia (no green cones) | #00397A | 0.020 |
| Tritanopia (no blue cones) | #004A54 | 0.094 |
| Achromatopsia (no color) | #3D3D3D | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3A7B
#1D3A7B
oklch(36.6% 0.116 263.6)
- #513A00
#513A00
oklch(36.5% 0.075 83.5)
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 #1D3A7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.027
- Marine Blue #01386A ΔE 0.037
- Cobalt #1E488F ΔE 0.050
- Prussian Blue #1D3557 ΔE 0.063
- Marine #042E60 ΔE 0.063
- Light Navy #155084 ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.068
- Dark Grey Blue #29465B ΔE 0.074
Use #1D3A7B 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.