#343CB0
Closest named color: Sapphire (#2138AB). oklch(42.9% 0.181 272.9), rgb(52, 60, 176).
Aa
White text reads best on this color (8.68:1).
About this color
#343CB0 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.181 and its hue 273°. 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 8.68:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.181) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.41:1 |
| White text | 8.68:1 |
Values
| HEX | #343CB0 |
| RGB | rgb(52, 60, 176) |
| HSL | hsl(236, 54%, 45%) |
| OKLCH | oklch(42.9% 0.181 272.9) |
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 #343CB0 | 8.68:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #343CB0 | 2.41:1 | Fails | Lc 14.9 | Not readable |
| #343CB0 text on white | 8.68:1 | AAA | Lc 89.1 | Fine for body text |
| #343CB0 text on black | 2.41:1 | Fails | Lc -13.1 | 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
#E3E9FF
oklch(93.6% 0.03 273.6)
-
Step 200
200
#CCD7FF
oklch(88.4% 0.057 273.1)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8298FF
oklch(70.8% 0.152 272.8)
-
Step 500
500
#6579FF
oklch(63.1% 0.198 273)
-
Step 600
600
#4D58F9
oklch(55.5% 0.236 272.8)
-
Step 700
700
#3F47D9
oklch(49.1% 0.218 272.7)
-
Step 800
800 (this color)
#343CB0
oklch(42.9% 0.181 272.9)
-
Step 900
900
#2C358B
oklch(37.7% 0.142 273)
-
Step 950
950
#192051
oklch(26.9% 0.089 272.8)
#343CB0 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) | #0051B4 | 0.054 |
| Deuteranopia (no green cones) | #0046AE | 0.040 |
| Tritanopia (no blue cones) | #005B70 | 0.147 |
| Achromatopsia (no color) | #4B4B4B | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343CB0
#343CB0
oklch(42.9% 0.181 272.9)
- #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 #343CB0, closest first.
No curated palette has a color within ΔE 0.04 of #343CB0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.027
- Blue Blue #2242C7 ΔE 0.042
- Majorelle Blue #3F37C9 ΔE 0.042
- Blueberry #464196 ΔE 0.052
- Indigo Blue #3A18B1 ΔE 0.058
- Blue With A Hint Of Purple #533CC6 ΔE 0.058
- Cobalt #1E488F ΔE 0.065
- Blurple #5539CC ΔE 0.066
Use #343CB0 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.