#2F42A9
Closest named color: Sapphire (#2138AB). oklch(43% 0.166 269.9), rgb(47, 66, 169).
Aa
White text reads best on this color (8.49:1).
About this color
#2F42A9 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.166 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.030 away. White text reads best on it, at 8.49:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.47:1 |
| White text | 8.49:1 |
Values
| HEX | #2F42A9 |
| RGB | rgb(47, 66, 169) |
| HSL | hsl(231, 56%, 42%) |
| OKLCH | oklch(43% 0.166 269.9) |
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 #2F42A9 | 8.49:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #2F42A9 | 2.47:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #2F42A9 text on white | 8.49:1 | AAA | Lc 88.7 | Fine for body text |
| #2F42A9 text on black | 2.47:1 | Fails | Lc -13.5 | Not readable |
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 800.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FD
oklch(93.5% 0.028 270.4)
-
Step 200
200
#CBD8FE
oklch(88.5% 0.054 270.4)
-
Step 300
300
#A8BEFF
oklch(80.9% 0.096 269.8)
-
Step 400
400
#7C99FF
oklch(70.6% 0.153 270.2)
-
Step 500
500
#5D7CFF
oklch(63.2% 0.197 269.9)
-
Step 600
600
#4660EF
oklch(55.6% 0.216 269.9)
-
Step 700
700
#384ED0
oklch(49.1% 0.201 269.8)
-
Step 800
800 (this color)
#2F42A9
oklch(43% 0.166 269.9)
-
Step 900
900
#283985
oklch(37.8% 0.129 269.7)
-
Step 950
950
#17224E
oklch(27% 0.082 269.6)
#2F42A9 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) | #0053AC | 0.046 |
| Deuteranopia (no green cones) | #0047A7 | 0.031 |
| Tritanopia (no blue cones) | #005C6F | 0.133 |
| Achromatopsia (no color) | #4D4D4D | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F42A9
#2F42A9
oklch(43% 0.166 269.9)
- #634D00
#634D00
oklch(43.1% 0.088 89.7)
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 #2F42A9, closest first.
No curated palette has a color within ΔE 0.04 of #2F42A9.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.030
- Blueberry #464196 ΔE 0.044
- Cobalt #1E488F ΔE 0.049
- Blue Blue #2242C7 ΔE 0.049
- Majorelle Blue #3F37C9 ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.060
- Dusk Blue #26538D ΔE 0.067
- Blue With A Hint Of Purple #533CC6 ΔE 0.069
Use #2F42A9 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.