#3151A9
Closest named color: Dusk Blue (#26538D). oklch(46.2% 0.146 265.8), rgb(49, 81, 169).
Aa
White text reads best on this color (7.29:1).
About this color
#3151A9 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.146 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.049 away. White text reads best on it, at 7.29:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.88:1 |
| White text | 7.29:1 |
Values
| HEX | #3151A9 |
| RGB | rgb(49, 81, 169) |
| HSL | hsl(224, 55%, 43%) |
| OKLCH | oklch(46.2% 0.146 265.8) |
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 #3151A9 | 7.29:1 | AAA | Lc -89.8 | Fine for body text |
| Black text on #3151A9 | 2.88:1 | Fails | Lc 19.1 | Dividers and decoration only |
| #3151A9 text on white | 7.29:1 | AAA | Lc 84.9 | Fine for body text |
| #3151A9 text on black | 2.88:1 | 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
#CDD9F4
oklch(88.5% 0.039 266.5)
-
Step 300
300
#ABC0EF
oklch(80.8% 0.071 266)
-
Step 400
400
#7F9EE8
oklch(70.6% 0.114 266.2)
-
Step 500
500
#6085E1
oklch(63.2% 0.145 265.9)
-
Step 600
600
#476CCE
oklch(55.5% 0.157 265.9)
-
Step 700
700 (this color)
#3151A9
oklch(46.2% 0.146 265.8)
-
Step 800
800
#2F4A91
oklch(42.8% 0.122 265.8)
-
Step 900
900
#293E73
oklch(37.6% 0.095 265.8)
-
Step 950
950
#182544
oklch(27% 0.061 265.4)
#3151A9 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) | #195CAC | 0.031 |
| Deuteranopia (no green cones) | #0051A7 | 0.030 |
| Tritanopia (no blue cones) | #006675 | 0.118 |
| Achromatopsia (no color) | #565656 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3151A9
#3151A9
oklch(46.2% 0.146 265.8)
- #705400
#705400
oklch(46.2% 0.095 86.2)
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 #3151A9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.049
- Denim Blue #3B5B92 ΔE 0.052
- Blueberry #464196 ΔE 0.052
- Cobalt #1E488F ΔE 0.053
- Twilight #4E518B ΔE 0.060
- Blue Blue #2242C7 ΔE 0.063
- Dusky Blue #475F94 ΔE 0.063
- Light Navy Blue #2E5A88 ΔE 0.063
Use #3151A9 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.