#343BA4
Closest named color: Sapphire (#2138AB). oklch(41.6% 0.166 273.7), rgb(52, 59, 164).
Aa
White text reads best on this color (9.10:1).
About this color
#343BA4 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.166 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.027 away. White text reads best on it, at 9.10:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.30:1 |
| White text | 9.10:1 |
Values
| HEX | #343BA4 |
| RGB | rgb(52, 59, 164) |
| HSL | hsl(236, 52%, 42%) |
| OKLCH | oklch(41.6% 0.166 273.7) |
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 #343BA4 | 9.10:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #343BA4 | 2.30:1 | Fails | Lc 13.6 | Not readable |
| #343BA4 text on white | 9.10:1 | AAA | Lc 90.4 | Preferred for body text |
| #343BA4 text on black | 2.30:1 | Fails | Lc -11.9 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CDD7FE
oklch(88.4% 0.055 273.9)
-
Step 300
300
#ADBDFF
oklch(81% 0.095 273.6)
-
Step 400
400
#8397FF
oklch(70.7% 0.153 273.6)
-
Step 500
500
#6778FF
oklch(63% 0.199 273.8)
-
Step 600
600
#515DEE
oklch(55.6% 0.215 273.5)
-
Step 700
700
#434BD0
oklch(49.2% 0.201 273.6)
-
Step 800
800 (this color)
#343BA4
oklch(41.6% 0.166 273.7)
-
Step 900
900
#2E3785
oklch(37.7% 0.13 273.5)
-
Step 950
950
#1B214E
oklch(27.1% 0.082 273.9)
#343BA4 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) | #004DA7 | 0.051 |
| Deuteranopia (no green cones) | #0043A2 | 0.041 |
| Tritanopia (no blue cones) | #00566A | 0.135 |
| Achromatopsia (no color) | #484848 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343BA4
#343BA4
oklch(41.6% 0.166 273.7)
- #5B4A00
#5B4A00
oklch(41.5% 0.085 93.8)
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 #343BA4, closest first.
No curated palette has a color within ΔE 0.04 of #343BA4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.027
- Blueberry #464196 ΔE 0.040
- Dark Slate Blue #483D8B ΔE 0.052
- Cobalt #1E488F ΔE 0.052
- Indigo Blue #3A18B1 ΔE 0.059
- Blue Blue #2242C7 ΔE 0.060
- Majorelle Blue #3F37C9 ΔE 0.061
- Blue With A Hint Of Purple #533CC6 ΔE 0.072
Use #343BA4 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.