#2A51AD
Closest named color: Dusk Blue (#26538D). oklch(46.1% 0.154 264), rgb(42, 81, 173).
Aa
White text reads best on this color (7.29:1).
About this color
#2A51AD is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.154 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.054 away. White text reads best on it, at 7.29:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.87:1 |
| White text | 7.29:1 |
Values
| HEX | #2A51AD |
| RGB | rgb(42, 81, 173) |
| HSL | hsl(222, 61%, 42%) |
| OKLCH | oklch(46.1% 0.154 264) |
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 #2A51AD | 7.29:1 | AAA | Lc -89.8 | Fine for body text |
| Black text on #2A51AD | 2.87:1 | Fails | Lc 19.1 | Dividers and decoration only |
| #2A51AD text on white | 7.29:1 | AAA | Lc 84.9 | Fine for body text |
| #2A51AD 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CBDAF5
oklch(88.6% 0.041 262.3)
-
Step 300
300
#A8C1F2
oklch(80.9% 0.075 263.7)
-
Step 400
400
#7A9FEB
oklch(70.7% 0.119 263.8)
-
Step 500
500
#5985E5
oklch(63.1% 0.153 264)
-
Step 600
600
#406CD3
oklch(55.5% 0.166 264.3)
-
Step 700
700 (this color)
#2A51AD
oklch(46.1% 0.154 264)
-
Step 800
800
#2A4A94
oklch(42.7% 0.128 264.1)
-
Step 900
900
#263F76
oklch(37.8% 0.099 263.9)
-
Step 950
950
#162545
oklch(27% 0.063 263.8)
#2A51AD 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) | #0E5DB0 | 0.033 |
| Deuteranopia (no green cones) | #0051AB | 0.023 |
| Tritanopia (no blue cones) | #006777 | 0.121 |
| Achromatopsia (no color) | #565656 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A51AD
#2A51AD
oklch(46.1% 0.154 264)
- #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 #2A51AD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.054
- Cobalt #1E488F ΔE 0.055
- Blue Blue #2242C7 ΔE 0.056
- Denim Blue #3B5B92 ΔE 0.059
- Blueberry #464196 ΔE 0.059
- Sapphire #2138AB ΔE 0.063
- Mid Blue #276AB3 ΔE 0.068
- Twilight #4E518B ΔE 0.069
Use #2A51AD 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.