#1D3E9B
Closest named color: Sapphire (#2138AB). oklch(40.2% 0.157 265), rgb(29, 62, 155).
Aa
White text reads best on this color (9.48:1).
About this color
#1D3E9B is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.157 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.029 away. White text reads best on it, at 9.48:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.21:1 |
| White text | 9.48:1 |
Values
| HEX | #1D3E9B |
| RGB | rgb(29, 62, 155) |
| HSL | hsl(224, 68%, 36%) |
| OKLCH | oklch(40.2% 0.157 265) |
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 #1D3E9B | 9.48:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #1D3E9B | 2.21:1 | Fails | Lc 12.6 | Not readable |
| #1D3E9B text on white | 9.48:1 | AAA | Lc 91.3 | Preferred for body text |
| #1D3E9B text on black | 2.21:1 | Fails | Lc -11.0 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C7D9FF
oklch(88.4% 0.056 265.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#729CFF
oklch(70.6% 0.153 265.4)
-
Step 500
500
#4D7FFF
oklch(63% 0.198 265.1)
-
Step 600
600
#2A5EFF
oklch(55.6% 0.245 265.1)
-
Step 700
700
#1A48E7
oklch(49.2% 0.242 265)
-
Step 800
800
#163DBA
oklch(42.7% 0.2 264.9)
-
Step 900
900 (this color)
#1D3E9B
oklch(40.2% 0.157 265)
-
Step 950
950
#0E2156
oklch(27% 0.099 265.2)
#1D3E9B 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) | #004C9E | 0.036 |
| Deuteranopia (no green cones) | #004099 | 0.016 |
| Tritanopia (no blue cones) | #005666 | 0.123 |
| Achromatopsia (no color) | #464646 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3E9B
#1D3E9B
oklch(40.2% 0.157 265)
- #5C4400
#5C4400
oklch(40.2% 0.082 85.6)
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 #1D3E9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.029
- Cobalt #1E488F ΔE 0.034
- Blueberry #464196 ΔE 0.054
- Twilight Blue #0A437A ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.061
- Light Navy #155084 ΔE 0.066
- Dusk Blue #26538D ΔE 0.066
- Blue Blue #2242C7 ΔE 0.072
Use #1D3E9B 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.