#1B39BE
Closest named color: Blue Blue (#2242C7). oklch(42.6% 0.209 266.3), rgb(27, 57, 190).
Aa
White text reads best on this color (8.84:1).
About this color
#1B39BE is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.209 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.027 away. White text reads best on it, at 8.84:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.209) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.37:1 |
| White text | 8.84:1 |
Values
| HEX | #1B39BE |
| RGB | rgb(27, 57, 190) |
| HSL | hsl(229, 75%, 43%) |
| OKLCH | oklch(42.6% 0.209 266.3) |
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 #1B39BE | 8.84:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #1B39BE | 2.37:1 | Fails | Lc 14.8 | Not readable |
| #1B39BE text on white | 8.84:1 | AAA | Lc 89.2 | Fine for body text |
| #1B39BE text on black | 2.37:1 | Fails | Lc -13.0 | 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 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
#749CFF
oklch(70.8% 0.152 266)
-
Step 500
500
#517EFF
oklch(63% 0.198 266.3)
-
Step 600
600
#315DFF
oklch(55.6% 0.244 266.2)
-
Step 700
700
#2143EC
oklch(49.1% 0.252 266.3)
-
Step 800
800 (this color)
#1B39BE
oklch(42.6% 0.209 266.3)
-
Step 900
900
#1A3496
oklch(37.6% 0.163 266.5)
-
Step 950
950
#0F2058
oklch(27% 0.104 266.4)
#1B39BE 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) | #0052C2 | 0.055 |
| Deuteranopia (no green cones) | #0042BC | 0.020 |
| Tritanopia (no blue cones) | #005F77 | 0.161 |
| Achromatopsia (no color) | #4A4A4A | 0.209 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B39BE
#1B39BE
oklch(42.6% 0.209 266.3)
- #644A00
#644A00
oklch(42.5% 0.087 85.4)
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 #1B39BE, closest first.
No curated palette has a color within ΔE 0.04 of #1B39BE.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.027
- Sapphire #2138AB ΔE 0.031
- Majorelle Blue #3F37C9 ΔE 0.044
- Indigo Blue #3A18B1 ΔE 0.063
- True Blue #010FCC ΔE 0.063
- Ultramarine Blue #1805DB ΔE 0.067
- Medium Blue #0000CD ΔE 0.072
- Blue With A Hint Of Purple #533CC6 ΔE 0.075
Use #1B39BE 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.