#2D51AB
Closest named color: Dusk Blue (#26538D). oklch(46.1% 0.15 264.7), rgb(45, 81, 171).
Aa
White text reads best on this color (7.30:1).
About this color
#2D51AB is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.150 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.051 away. White text reads best on it, at 7.30:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.87:1 |
| White text | 7.30:1 |
Values
| HEX | #2D51AB |
| RGB | rgb(45, 81, 171) |
| HSL | hsl(223, 58%, 42%) |
| OKLCH | oklch(46.1% 0.15 264.7) |
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 #2D51AB | 7.30:1 | AAA | Lc -89.8 | Fine for body text |
| Black text on #2D51AB | 2.87:1 | Fails | Lc 19.1 | Dividers and decoration only |
| #2D51AB text on white | 7.30:1 | AAA | Lc 84.9 | Fine for body text |
| #2D51AB text on black | 2.87:1 | Fails | Lc -17.1 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCD9F5
oklch(88.4% 0.041 265.7)
-
Step 300
300
#A9C1F1
oklch(81% 0.073 264)
-
Step 400
400
#7C9FE9
oklch(70.7% 0.116 264.3)
-
Step 500
500
#5C85E3
oklch(63.1% 0.149 264.7)
-
Step 600
600
#436CD1
oklch(55.5% 0.163 265)
-
Step 700
700 (this color)
#2D51AB
oklch(46.1% 0.15 264.7)
-
Step 800
800
#2C4A92
oklch(42.7% 0.124 264.7)
-
Step 900
900
#273F75
oklch(37.8% 0.097 264.3)
-
Step 950
950
#172544
oklch(27% 0.061 264.4)
#2D51AB 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) | #145CAE | 0.030 |
| Deuteranopia (no green cones) | #0051A9 | 0.026 |
| Tritanopia (no blue cones) | #006776 | 0.120 |
| Achromatopsia (no color) | #565656 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2D51AB
#2D51AB
oklch(46.1% 0.15 264.7)
- #715300
#715300
oklch(46.1% 0.095 84.3)
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 #2D51AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.051
- Cobalt #1E488F ΔE 0.054
- Denim Blue #3B5B92 ΔE 0.055
- Blueberry #464196 ΔE 0.056
- Blue Blue #2242C7 ΔE 0.059
- Sapphire #2138AB ΔE 0.064
- Twilight #4E518B ΔE 0.065
- Light Navy Blue #2E5A88 ΔE 0.066
Use #2D51AB 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.