#2F51A8
Closest named color: Dusk Blue (#26538D). oklch(46% 0.146 265.1), rgb(47, 81, 168).
Aa
White text reads best on this color (7.33:1).
About this color
#2F51A8 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.146 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.047 away. White text reads best on it, at 7.33:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.86:1 |
| White text | 7.33:1 |
Values
| HEX | #2F51A8 |
| RGB | rgb(47, 81, 168) |
| HSL | hsl(223, 56%, 42%) |
| OKLCH | oklch(46% 0.146 265.1) |
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 #2F51A8 | 7.33:1 | AAA | Lc -90.0 | Fine for body text |
| Black text on #2F51A8 | 2.86:1 | Fails | Lc 18.9 | Dividers and decoration only |
| #2F51A8 text on white | 7.33:1 | AAA | Lc 85.1 | Fine for body text |
| #2F51A8 text on black | 2.86:1 | Fails | Lc -16.9 | 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
#CDD9F4
oklch(88.5% 0.039 266.5)
-
Step 300
300
#ABC1EF
oklch(81% 0.07 264.9)
-
Step 400
400
#7E9FE7
oklch(70.7% 0.112 264.9)
-
Step 500
500
#5E85E0
oklch(63.1% 0.144 265.1)
-
Step 600
600
#456DCE
oklch(55.6% 0.157 264.9)
-
Step 700
700 (this color)
#2F51A8
oklch(46% 0.146 265.1)
-
Step 800
800
#2E4A90
oklch(42.6% 0.12 265.3)
-
Step 900
900
#293F73
oklch(37.8% 0.093 265)
-
Step 950
950
#182543
oklch(27% 0.059 265)
#2F51A8 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) | #1B5CAB | 0.030 |
| Deuteranopia (no green cones) | #0051A6 | 0.028 |
| Tritanopia (no blue cones) | #006674 | 0.118 |
| Achromatopsia (no color) | #565656 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F51A8
#2F51A8
oklch(46% 0.146 265.1)
- #705300
#705300
oklch(46% 0.094 85.1)
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 #2F51A8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.047
- Cobalt #1E488F ΔE 0.051
- Denim Blue #3B5B92 ΔE 0.051
- Blueberry #464196 ΔE 0.052
- Twilight #4E518B ΔE 0.060
- Light Navy Blue #2E5A88 ΔE 0.062
- Dusky Blue #475F94 ΔE 0.063
- Blue Blue #2242C7 ΔE 0.063
Use #2F51A8 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.