#343FAA
Closest named color: Sapphire (#2138AB). oklch(42.8% 0.17 272.5), rgb(52, 63, 170).
Aa
White text reads best on this color (8.61:1).
About this color
#343FAA is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.170 and its hue 272°. 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 8.61:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.43:1 |
| White text | 8.61:1 |
Values
| HEX | #343FAA |
| RGB | rgb(52, 63, 170) |
| HSL | hsl(234, 53%, 44%) |
| OKLCH | oklch(42.8% 0.17 272.5) |
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 #343FAA | 8.61:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #343FAA | 2.43:1 | Fails | Lc 14.9 | Not readable |
| #343FAA text on white | 8.61:1 | AAA | Lc 89.0 | Fine for body text |
| #343FAA text on black | 2.43:1 | Fails | Lc -13.2 | 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
#E3E9FE
oklch(93.6% 0.029 273.1)
-
Step 200
200
#CCD8FE
oklch(88.5% 0.054 271.5)
-
Step 300
300
#ABBDFF
oklch(80.9% 0.096 272.3)
-
Step 400
400
#8198FF
oklch(70.7% 0.153 272.5)
-
Step 500
500
#647AFF
oklch(63.2% 0.198 272.4)
-
Step 600
600
#4D5DF1
oklch(55.6% 0.22 272.3)
-
Step 700
700
#3F4BD2
oklch(49.1% 0.205 272.3)
-
Step 800
800 (this color)
#343FAA
oklch(42.8% 0.17 272.5)
-
Step 900
900
#2C3786
oklch(37.7% 0.132 272.4)
-
Step 950
950
#19214F
oklch(27% 0.085 272.1)
#343FAA 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) | #0051AD | 0.050 |
| Deuteranopia (no green cones) | #0046A8 | 0.038 |
| Tritanopia (no blue cones) | #005A6E | 0.137 |
| Achromatopsia (no color) | #4C4C4C | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343FAA
#343FAA
oklch(42.8% 0.17 272.5)
- #604D00
#604D00
oklch(42.7% 0.087 92.5)
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 #343FAA, closest first.
No curated palette has a color within ΔE 0.04 of #343FAA.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.030
- Blueberry #464196 ΔE 0.042
- Blue Blue #2242C7 ΔE 0.050
- Majorelle Blue #3F37C9 ΔE 0.053
- Cobalt #1E488F ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.058
- Blue With A Hint Of Purple #533CC6 ΔE 0.064
- Indigo Blue #3A18B1 ΔE 0.066
Use #343FAA 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.