#3151A8
Closest named color: Dusk Blue (#26538D). oklch(46.1% 0.145 265.7), rgb(49, 81, 168).
Aa
White text reads best on this color (7.30:1).
About this color
#3151A8 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.145 and its hue 266°. 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 7.30:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.87:1 |
| White text | 7.30:1 |
Values
| HEX | #3151A8 |
| RGB | rgb(49, 81, 168) |
| HSL | hsl(224, 55%, 43%) |
| OKLCH | oklch(46.1% 0.145 265.7) |
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 #3151A8 | 7.30:1 | AAA | Lc -89.9 | Fine for body text |
| Black text on #3151A8 | 2.87:1 | Fails | Lc 19.0 | Dividers and decoration only |
| #3151A8 text on white | 7.30:1 | AAA | Lc 85.0 | Fine for body text |
| #3151A8 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
#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
#7F9FE7
oklch(70.8% 0.112 265.4)
-
Step 500
500
#6085E0
oklch(63.2% 0.143 265.8)
-
Step 600
600
#476CCE
oklch(55.5% 0.157 265.9)
-
Step 700
700 (this color)
#3151A8
oklch(46.1% 0.145 265.7)
-
Step 800
800
#2F4A90
oklch(42.7% 0.12 265.7)
-
Step 900
900
#2A3E73
oklch(37.6% 0.094 266.4)
-
Step 950
950
#182543
oklch(27% 0.059 265)
#3151A8 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 | 0.031 |
| Deuteranopia (no green cones) | #0051A6 | 0.030 |
| Tritanopia (no blue cones) | #006674 | 0.119 |
| Achromatopsia (no color) | #565656 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3151A8
#3151A8
oklch(46.1% 0.145 265.7)
- #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 #3151A8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.047
- Denim Blue #3B5B92 ΔE 0.051
- Blueberry #464196 ΔE 0.052
- Cobalt #1E488F ΔE 0.052
- Twilight #4E518B ΔE 0.059
- Light Navy Blue #2E5A88 ΔE 0.062
- Dusky Blue #475F94 ΔE 0.062
- Blue Blue #2242C7 ΔE 0.064
Use #3151A8 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.