#1B3ABC
Closest named color: Blue Blue (#2242C7). oklch(42.5% 0.205 266.2), rgb(27, 58, 188).
Aa
White text reads best on this color (8.83:1).
About this color
#1B3ABC is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.205 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 8.83:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.205) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.37:1 |
| White text | 8.83:1 |
Values
| HEX | #1B3ABC |
| RGB | rgb(27, 58, 188) |
| HSL | hsl(228, 75%, 42%) |
| OKLCH | oklch(42.5% 0.205 266.2) |
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 #1B3ABC | 8.83:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #1B3ABC | 2.37:1 | Fails | Lc 14.8 | Not readable |
| #1B3ABC text on white | 8.83:1 | AAA | Lc 89.2 | Fine for body text |
| #1B3ABC 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
#A4C0FF
oklch(81% 0.095 265.8)
-
Step 400
400
#749CFF
oklch(70.8% 0.152 266)
-
Step 500
500
#517FFF
oklch(63.2% 0.197 266)
-
Step 600
600
#315DFF
oklch(55.6% 0.244 266.2)
-
Step 700
700
#2145EA
oklch(49.2% 0.248 266.2)
-
Step 800
800 (this color)
#1B3ABC
oklch(42.5% 0.205 266.2)
-
Step 900
900
#1A3595
oklch(37.7% 0.16 266.2)
-
Step 950
950
#0F2057
oklch(26.9% 0.102 266.4)
#1B3ABC 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) | #0052C0 | 0.053 |
| Deuteranopia (no green cones) | #0043BA | 0.020 |
| Tritanopia (no blue cones) | #005E76 | 0.157 |
| Achromatopsia (no color) | #4A4A4A | 0.206 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3ABC
#1B3ABC
oklch(42.5% 0.205 266.2)
- #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 #1B3ABC, closest first.
No curated palette has a color within ΔE 0.04 of #1B3ABC.
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 0.028
- Majorelle Blue #3F37C9 ΔE 0.045
- Indigo Blue #3A18B1 ΔE 0.063
- True Blue #010FCC ΔE 0.066
- Ultramarine Blue #1805DB ΔE 0.071
- Medium Blue #0000CD ΔE 0.074
- Blue With A Hint Of Purple #533CC6 ΔE 0.075
Use #1B3ABC 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.