#1B5CB3
Closest named color: Mid Blue (#276AB3). oklch(48.5% 0.153 257.5), rgb(27, 92, 179).
Aa
White text reads best on this color (6.50:1).
About this color
#1B5CB3 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.153 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.041 away. White text reads best on it, at 6.50:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.22:1 |
| White text | 6.50:1 |
Values
| HEX | #1B5CB3 |
| RGB | rgb(27, 92, 179) |
| HSL | hsl(214, 74%, 40%) |
| OKLCH | oklch(48.5% 0.153 257.5) |
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 #1B5CB3 | 6.50:1 | AA | Lc -86.8 | Fine for body text |
| Black text on #1B5CB3 | 3.22:1 | AA large text | Lc 22.3 | Dividers and decoration only |
| #1B5CB3 text on white | 6.50:1 | AA | Lc 81.7 | Fine for body text |
| #1B5CB3 text on black | 3.22:1 | AA large text | Lc -20.2 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C9DBF5
oklch(88.6% 0.041 257.5)
-
Step 300
300
#A3C3F1
oklch(81% 0.074 257.4)
-
Step 400
400
#70A2EA
oklch(70.7% 0.119 257.5)
-
Step 500
500
#4A89E3
oklch(63.1% 0.151 257.6)
-
Step 600
600
#2B71D1
oklch(55.7% 0.164 257.5)
-
Step 700
700 (this color)
#1B5CB3
oklch(48.5% 0.153 257.5)
-
Step 800
800
#1A4D92
oklch(42.6% 0.126 257.3)
-
Step 900
900
#1C4175
oklch(37.8% 0.099 257.5)
-
Step 950
950
#112644
oklch(26.9% 0.062 257.5)
#1B5CB3 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) | #2965B6 | 0.028 |
| Deuteranopia (no green cones) | #0057B1 | 0.019 |
| Tritanopia (no blue cones) | #00717F | 0.115 |
| Achromatopsia (no color) | #5E5E5E | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B5CB3
#1B5CB3
oklch(48.5% 0.153 257.5)
- #7E5600
#7E5600
oklch(48.4% 0.101 77.5)
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 #1B5CB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.057
- French Blue #436BAD ΔE 0.060
- Dusk Blue #26538D ΔE 0.063
- Peacock Blue #016795 ΔE 0.063
- Dusky Blue #475F94 ΔE 0.064
- Light Navy Blue #2E5A88 ΔE 0.069
- Blue Blue #2242C7 ΔE 0.071
Use #1B5CB3 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.