#1B58AD
Closest named color: Dusk Blue (#26538D). oklch(47.2% 0.149 258), rgb(27, 88, 173).
Aa
White text reads best on this color (6.89:1).
About this color
#1B58AD is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.149 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.052 away. White text reads best on it, at 6.89:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 3.04:1 |
| White text | 6.89:1 |
Values
| HEX | #1B58AD |
| RGB | rgb(27, 88, 173) |
| HSL | hsl(215, 73%, 39%) |
| OKLCH | oklch(47.2% 0.149 258) |
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 #1B58AD | 6.89:1 | AA | Lc -88.3 | Fine for body text |
| Black text on #1B58AD | 3.04:1 | AA large text | Lc 20.7 | Dividers and decoration only |
| #1B58AD text on white | 6.89:1 | AA | Lc 83.3 | Fine for body text |
| #1B58AD text on black | 3.04:1 | AA large text | Lc -18.6 | 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
#C9DBF4
oklch(88.6% 0.04 256.6)
-
Step 300
300
#A4C3F0
oklch(81% 0.072 257.6)
-
Step 400
400
#72A2E8
oklch(70.7% 0.116 257.7)
-
Step 500
500
#4D89E1
oklch(63.1% 0.147 258)
-
Step 600
600
#2F71CF
oklch(55.7% 0.16 257.9)
-
Step 700
700 (this color)
#1B58AD
oklch(47.2% 0.149 258)
-
Step 800
800
#1E4D91
oklch(42.7% 0.123 258.1)
-
Step 900
900
#1E4174
oklch(37.8% 0.096 258)
-
Step 950
950
#122644
oklch(26.9% 0.062 258.3)
#1B58AD 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) | #2561B0 | 0.027 |
| Deuteranopia (no green cones) | #0054AB | 0.017 |
| Tritanopia (no blue cones) | #006D7A | 0.115 |
| Achromatopsia (no color) | #5A5A5A | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B58AD
#1B58AD
oklch(47.2% 0.149 258)
- #795300
#795300
oklch(47.2% 0.098 78.1)
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 #1B58AD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.052
- Mid Blue #276AB3 ΔE 0.052
- Denim Blue #3B5B92 ΔE 0.053
- Cobalt #1E488F ΔE 0.062
- Light Navy Blue #2E5A88 ΔE 0.062
- Peacock Blue #016795 ΔE 0.063
- Dusky Blue #475F94 ΔE 0.064
- Blue Blue #2242C7 ΔE 0.067
Use #1B58AD 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.