#1B5AAA
Closest named color: Denim Blue (#3B5B92). oklch(47.4% 0.143 256.6), rgb(27, 90, 170).
Aa
White text reads best on this color (6.79:1).
About this color
#1B5AAA is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.143 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.046 away. White text reads best on it, at 6.79:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.08:1 |
| White text | 6.79:1 |
Values
| HEX | #1B5AAA |
| RGB | rgb(27, 90, 170) |
| HSL | hsl(214, 73%, 39%) |
| OKLCH | oklch(47.4% 0.143 256.6) |
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 #1B5AAA | 6.79:1 | AA | Lc -88.0 | Fine for body text |
| Black text on #1B5AAA | 3.08:1 | AA large text | Lc 21.1 | Dividers and decoration only |
| #1B5AAA text on white | 6.79:1 | AA | Lc 83.0 | Fine for body text |
| #1B5AAA text on black | 3.08:1 | AA large text | Lc -19.0 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF8
oklch(93.7% 0.02 257.5)
-
Step 200
200
#C9DBF3
oklch(88.5% 0.038 255.6)
-
Step 300
300
#A4C3ED
oklch(80.9% 0.069 256.1)
-
Step 400
400
#73A3E5
oklch(70.8% 0.11 256.5)
-
Step 500
500
#4D8ADD
oklch(63.1% 0.141 256.6)
-
Step 600
600
#2E72CB
oklch(55.6% 0.154 256.6)
-
Step 700
700 (this color)
#1B5AAA
oklch(47.4% 0.143 256.6)
-
Step 800
800
#1D4E8E
oklch(42.7% 0.118 256.6)
-
Step 900
900
#1E4171
oklch(37.6% 0.092 256.9)
-
Step 950
950
#122742
oklch(27.1% 0.057 255.5)
#1B5AAA 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) | #2E62AD | 0.029 |
| Deuteranopia (no green cones) | #0155A8 | 0.019 |
| Tritanopia (no blue cones) | #006D79 | 0.109 |
| Achromatopsia (no color) | #5B5B5B | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B5AAA
#1B5AAA
oklch(47.4% 0.143 256.6)
- #7B5300
#7B5300
oklch(47.4% 0.099 76.6)
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 #1B5AAA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.046
- Mid Blue #276AB3 ΔE 0.048
- Dusk Blue #26538D ΔE 0.048
- Peacock Blue #016795 ΔE 0.055
- Light Navy Blue #2E5A88 ΔE 0.056
- Dusky Blue #475F94 ΔE 0.058
- Cobalt #1E488F ΔE 0.063
- French Blue #436BAD ΔE 0.064
Use #1B5AAA 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.