#1B5EAC
Closest named color: Mid Blue (#276AB3). oklch(48.5% 0.141 255.3), rgb(27, 94, 172).
Aa
White text reads best on this color (6.47:1).
About this color
#1B5EAC is a medium-dark, vivid blue. In OKLCH its lightness is 48%, its chroma 0.141 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.037 away. White text reads best on it, at 6.47:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.24:1 |
| White text | 6.47:1 |
Values
| HEX | #1B5EAC |
| RGB | rgb(27, 94, 172) |
| HSL | hsl(212, 73%, 39%) |
| OKLCH | oklch(48.5% 0.141 255.3) |
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 #1B5EAC | 6.47:1 | AA | Lc -86.7 | Fine for body text |
| Black text on #1B5EAC | 3.24:1 | AA large text | Lc 22.4 | Dividers and decoration only |
| #1B5EAC text on white | 6.47:1 | AA | Lc 81.6 | Fine for body text |
| #1B5EAC text on black | 3.24:1 | 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
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C9DBF2
oklch(88.5% 0.037 254.6)
-
Step 300
300
#A4C3ED
oklch(80.9% 0.069 256.1)
-
Step 400
400
#71A3E4
oklch(70.7% 0.11 255.4)
-
Step 500
500
#4B8BDC
oklch(63.2% 0.139 255.3)
-
Step 600
600
#2B73C9
oklch(55.6% 0.151 255.2)
-
Step 700
700 (this color)
#1B5EAC
oklch(48.5% 0.141 255.3)
-
Step 800
800
#1B4F8D
oklch(42.8% 0.116 255.1)
-
Step 900
900
#1C4271
oklch(37.7% 0.092 255.2)
-
Step 950
950
#122742
oklch(27.1% 0.057 255.5)
#1B5EAC 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) | #3565AF | 0.030 |
| Deuteranopia (no green cones) | #1358AA | 0.018 |
| Tritanopia (no blue cones) | #00717C | 0.107 |
| Achromatopsia (no color) | #5E5E5E | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B5EAC
#1B5EAC
oklch(48.5% 0.141 255.3)
- #805500
#805500
oklch(48.5% 0.102 75.1)
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 #1B5EAC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.046
- Peacock Blue #016795 ΔE 0.050
- French Blue #436BAD ΔE 0.054
- Dusky Blue #475F94 ΔE 0.054
- Dusk Blue #26538D ΔE 0.054
- Light Navy Blue #2E5A88 ΔE 0.058
- Denim #3B638C ΔE 0.061
Use #1B5EAC 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.