#1B339A
Closest named color: Sapphire (#2138AB). oklch(37.9% 0.169 267), rgb(27, 51, 154).
Aa
White text reads best on this color (10.57:1).
About this color
#1B339A is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.169 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.032 away. White text reads best on it, at 10.57:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 1.98:1 |
| White text | 10.57:1 |
Values
| HEX | #1B339A |
| RGB | rgb(27, 51, 154) |
| HSL | hsl(229, 70%, 35%) |
| OKLCH | oklch(37.9% 0.169 267) |
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 #1B339A | 10.57:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #1B339A | 1.98:1 | Fails | Lc 10.2 | Not readable |
| #1B339A text on white | 10.57:1 | AAA | Lc 93.8 | Preferred for body text |
| #1B339A text on black | 1.98:1 | Fails | Lc -8.8 | 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 900.
-
Step 50
50
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A5BFFF
oklch(80.9% 0.095 267.2)
-
Step 400
400
#769BFF
oklch(70.7% 0.152 267.2)
-
Step 500
500
#547EFF
oklch(63.1% 0.197 267)
-
Step 600
600
#355CFF
oklch(55.6% 0.244 267)
-
Step 700
700
#243EF2
oklch(49.1% 0.263 267)
-
Step 800
800
#1D36C3
oklch(42.7% 0.217 267)
-
Step 900
900 (this color)
#1B339A
oklch(37.9% 0.169 267)
-
Step 950
950
#0F1F5A
oklch(27% 0.108 267)
#1B339A 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) | #00459D | 0.043 |
| Deuteranopia (no green cones) | #003998 | 0.019 |
| Tritanopia (no blue cones) | #004F62 | 0.131 |
| Achromatopsia (no color) | #3F3F3F | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B339A
#1B339A
oklch(37.9% 0.169 267)
- #543F00
#543F00
oklch(38% 0.078 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 #1B339A, closest first.
No curated palette has a color within ΔE 0.04 of #1B339A.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.032
- Cobalt #1E488F ΔE 0.058
- Royal #0C1793 ΔE 0.061
- Indigo Blue #3A18B1 ΔE 0.062
- Ultramarine #2000B1 ΔE 0.067
- Cobalt Blue #030AA7 ΔE 0.069
- Twilight Blue #0A437A ΔE 0.070
- Blueberry #464196 ΔE 0.072
Use #1B339A 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.