#1D3BB7
Closest named color: Sapphire (#2138AB). oklch(42.3% 0.197 266.4), rgb(29, 59, 183).
Aa
White text reads best on this color (8.89:1).
About this color
#1D3BB7 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.197 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.021 away. White text reads best on it, at 8.89:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.197) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.36:1 |
| White text | 8.89:1 |
Values
| HEX | #1D3BB7 |
| RGB | rgb(29, 59, 183) |
| HSL | hsl(228, 73%, 42%) |
| OKLCH | oklch(42.3% 0.197 266.4) |
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 #1D3BB7 | 8.89:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #1D3BB7 | 2.36:1 | Fails | Lc 14.5 | Not readable |
| #1D3BB7 text on white | 8.89:1 | AAA | Lc 89.5 | Fine for body text |
| #1D3BB7 text on black | 2.36:1 | Fails | Lc -12.8 | 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 800.
-
Step 50
50
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A4BFFF
oklch(80.8% 0.096 266.6)
-
Step 400
400
#759CFF
oklch(70.8% 0.151 266.4)
-
Step 500
500
#527EFF
oklch(63% 0.198 266.5)
-
Step 600
600
#325DFF
oklch(55.6% 0.244 266.4)
-
Step 700
700
#2447E5
oklch(49.1% 0.239 266.4)
-
Step 800
800 (this color)
#1D3BB7
oklch(42.3% 0.197 266.4)
-
Step 900
900
#1C3691
oklch(37.6% 0.153 266.5)
-
Step 950
950
#102155
oklch(27% 0.097 266.2)
#1D3BB7 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) | #0051BB | 0.050 |
| Deuteranopia (no green cones) | #0043B5 | 0.020 |
| Tritanopia (no blue cones) | #005D74 | 0.151 |
| Achromatopsia (no color) | #4A4A4A | 0.198 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3BB7
#1D3BB7
oklch(42.3% 0.197 266.4)
- #624A00
#624A00
oklch(42.3% 0.086 87.2)
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 #1D3BB7, closest first.
No curated palette has a color within ΔE 0.04 of #1D3BB7.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.021
- Blue Blue #2242C7 ΔE 0.032
- Majorelle Blue #3F37C9 ΔE 0.048
- Indigo Blue #3A18B1 ΔE 0.062
- True Blue #010FCC ΔE 0.071
- Cobalt #1E488F ΔE 0.073
- Blue With A Hint Of Purple #533CC6 ΔE 0.075
- Blueberry #464196 ΔE 0.076
Use #1D3BB7 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.