#2A51AC
Closest named color: Dusk Blue (#26538D). oklch(46.1% 0.153 263.9), rgb(42, 81, 172).
Aa
White text reads best on this color (7.31:1).
About this color
#2A51AC is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.153 and its hue 264°. 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 7.31:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.87:1 |
| White text | 7.31:1 |
Values
| HEX | #2A51AC |
| RGB | rgb(42, 81, 172) |
| HSL | hsl(222, 61%, 42%) |
| OKLCH | oklch(46.1% 0.153 263.9) |
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 #2A51AC | 7.31:1 | AAA | Lc -89.9 | Fine for body text |
| Black text on #2A51AC | 2.87:1 | Fails | Lc 19.1 | Dividers and decoration only |
| #2A51AC text on white | 7.31:1 | AAA | Lc 85.0 | Fine for body text |
| #2A51AC text on black | 2.87:1 | Fails | Lc -17.0 | 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
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CBDAF5
oklch(88.6% 0.041 262.3)
-
Step 300
300
#A8C1F1
oklch(80.9% 0.074 263.3)
-
Step 400
400
#7B9FEA
oklch(70.7% 0.118 264.1)
-
Step 500
500
#5985E4
oklch(63% 0.151 263.9)
-
Step 600
600
#406DD2
oklch(55.7% 0.164 263.8)
-
Step 700
700 (this color)
#2A51AC
oklch(46.1% 0.153 263.9)
-
Step 800
800
#2A4A93
oklch(42.7% 0.126 264)
-
Step 900
900
#263F75
oklch(37.8% 0.097 263.7)
-
Step 950
950
#162545
oklch(27% 0.063 263.8)
#2A51AC 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) | #115DAF | 0.032 |
| Deuteranopia (no green cones) | #0051AA | 0.023 |
| Tritanopia (no blue cones) | #006776 | 0.121 |
| Achromatopsia (no color) | #565656 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A51AC
#2A51AC
oklch(46.1% 0.153 263.9)
- #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 #2A51AC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.052
- Cobalt #1E488F ΔE 0.054
- Blue Blue #2242C7 ΔE 0.057
- Denim Blue #3B5B92 ΔE 0.057
- Blueberry #464196 ΔE 0.058
- Sapphire #2138AB ΔE 0.063
- Twilight #4E518B ΔE 0.068
- Mid Blue #276AB3 ΔE 0.068
Use #2A51AC 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.