#2F42A1
Closest named color: Sapphire (#2138AB). oklch(42.3% 0.155 269.9), rgb(47, 66, 161).
Aa
White text reads best on this color (8.69:1).
About this color
#2F42A1 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.155 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.034 away. White text reads best on it, at 8.69:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.41:1 |
| White text | 8.69:1 |
Values
| HEX | #2F42A1 |
| RGB | rgb(47, 66, 161) |
| HSL | hsl(230, 55%, 41%) |
| OKLCH | oklch(42.3% 0.155 269.9) |
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 #2F42A1 | 8.69:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #2F42A1 | 2.41:1 | Fails | Lc 14.6 | Not readable |
| #2F42A1 text on white | 8.69:1 | AAA | Lc 89.4 | Fine for body text |
| #2F42A1 text on black | 2.41:1 | Fails | Lc -12.9 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3EAFC
oklch(93.7% 0.025 268.8)
-
Step 200
200
#CCD8FB
oklch(88.4% 0.05 270.4)
-
Step 300
300
#AABEFC
oklch(80.9% 0.091 270.5)
-
Step 400
400
#7E9AFB
oklch(70.7% 0.146 270.2)
-
Step 500
500
#5F7DF8
oklch(63% 0.186 270)
-
Step 600
600
#4863E7
oklch(55.6% 0.201 269.8)
-
Step 700
700
#3A51C9
oklch(49.2% 0.187 269.8)
-
Step 800
800 (this color)
#2F42A1
oklch(42.3% 0.155 269.9)
-
Step 900
900
#2A3A81
oklch(37.8% 0.121 270.1)
-
Step 950
950
#18234B
oklch(27.1% 0.075 269.3)
#2F42A1 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) | #0051A4 | 0.043 |
| Deuteranopia (no green cones) | #00469F | 0.032 |
| Tritanopia (no blue cones) | #005A6B | 0.126 |
| Achromatopsia (no color) | #4B4B4B | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F42A1
#2F42A1
oklch(42.3% 0.155 269.9)
- #604B00
#604B00
oklch(42.3% 0.086 90.2)
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 #2F42A1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.034
- Blueberry #464196 ΔE 0.036
- Cobalt #1E488F ΔE 0.038
- Dark Slate Blue #483D8B ΔE 0.050
- Dusk Blue #26538D ΔE 0.059
- Blue Blue #2242C7 ΔE 0.062
- Light Navy #155084 ΔE 0.067
- Majorelle Blue #3F37C9 ΔE 0.069
Use #2F42A1 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.