#1B59BD
Closest named color: Mid Blue (#276AB3). oklch(48.6% 0.17 260), rgb(27, 89, 189).
Aa
White text reads best on this color (6.54:1).
About this color
#1B59BD is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.170 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.053 away. White text reads best on it, at 6.54:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.21:1 |
| White text | 6.54:1 |
Values
| HEX | #1B59BD |
| RGB | rgb(27, 89, 189) |
| HSL | hsl(217, 75%, 42%) |
| OKLCH | oklch(48.6% 0.17 260) |
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 #1B59BD | 6.54:1 | AA | Lc -86.9 | Fine for body text |
| Black text on #1B59BD | 3.21:1 | AA large text | Lc 22.2 | Dividers and decoration only |
| #1B59BD text on white | 6.54:1 | AA | Lc 81.8 | Fine for body text |
| #1B59BD text on black | 3.21:1 | AA large text | Lc -20.1 | Dividers and decoration only |
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 700.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DAF8
oklch(88.4% 0.046 260.7)
-
Step 300
300
#A2C2F6
oklch(80.9% 0.082 260)
-
Step 400
400
#6FA0F2
oklch(70.6% 0.132 260.2)
-
Step 500
500
#4886ED
oklch(63% 0.168 260)
-
Step 600
600
#2A6DDC
oklch(55.6% 0.183 260.1)
-
Step 700
700 (this color)
#1B59BD
oklch(48.6% 0.17 260)
-
Step 800
800
#1A4B9A
oklch(42.8% 0.14 259.8)
-
Step 900
900
#1B3F7B
oklch(37.7% 0.11 260)
-
Step 950
950
#112548
oklch(26.9% 0.07 260.7)
#1B59BD 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) | #0865C1 | 0.031 |
| Deuteranopia (no green cones) | #0057BB | 0.013 |
| Tritanopia (no blue cones) | #007282 | 0.131 |
| Achromatopsia (no color) | #5D5D5D | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B59BD
#1B59BD
oklch(48.6% 0.17 260)
- #7D5800
#7D5800
oklch(48.7% 0.101 80.2)
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 #1B59BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.053
- Blue Blue #2242C7 ΔE 0.056
- Warm Blue #4B57DB ΔE 0.066
- French Blue #436BAD ΔE 0.071
- Denim Blue #3B5B92 ΔE 0.074
- Azul #1D5DEC ΔE 0.074
- Dusk Blue #26538D ΔE 0.077
- Majorelle Blue #3F37C9 ΔE 0.078
Use #1B59BD 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.