#1D55B0
Closest named color: Dusk Blue (#26538D). oklch(46.8% 0.157 259.9), rgb(29, 85, 176).
Aa
White text reads best on this color (7.05:1).
About this color
#1D55B0 is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.157 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.056 away. White text reads best on it, at 7.05:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.97:1 |
| White text | 7.05:1 |
Values
| HEX | #1D55B0 |
| RGB | rgb(29, 85, 176) |
| HSL | hsl(217, 72%, 40%) |
| OKLCH | oklch(46.8% 0.157 259.9) |
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 #1D55B0 | 7.05:1 | AAA | Lc -88.9 | Fine for body text |
| Black text on #1D55B0 | 2.97:1 | Fails | Lc 20.1 | Dividers and decoration only |
| #1D55B0 text on white | 7.05:1 | AAA | Lc 83.9 | Fine for body text |
| #1D55B0 text on black | 2.97:1 | Fails | Lc -18.1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EAF9
oklch(93.5% 0.023 260.7)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A4C2F2
oklch(80.9% 0.076 259.7)
-
Step 400
400
#73A1EC
oklch(70.7% 0.121 259.8)
-
Step 500
500
#4E87E6
oklch(63.1% 0.156 260)
-
Step 600
600
#316FD4
oklch(55.6% 0.168 259.8)
-
Step 700
700 (this color)
#1D55B0
oklch(46.8% 0.157 259.9)
-
Step 800
800
#1F4C95
oklch(42.8% 0.13 259.7)
-
Step 900
900
#1F4076
oklch(37.7% 0.1 259.8)
-
Step 950
950
#132645
oklch(27.1% 0.063 259.7)
#1D55B0 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) | #1760B3 | 0.029 |
| Deuteranopia (no green cones) | #0052AE | 0.016 |
| Tritanopia (no blue cones) | #006B7A | 0.120 |
| Achromatopsia (no color) | #595959 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D55B0
#1D55B0
oklch(46.8% 0.157 259.9)
- #765300
#765300
oklch(46.8% 0.097 80.4)
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 #1D55B0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.056
- Blue Blue #2242C7 ΔE 0.058
- Mid Blue #276AB3 ΔE 0.059
- Denim Blue #3B5B92 ΔE 0.060
- Cobalt #1E488F ΔE 0.062
- Light Navy Blue #2E5A88 ΔE 0.070
- Sapphire #2138AB ΔE 0.071
- Dusky Blue #475F94 ΔE 0.071
Use #1D55B0 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.