Helvetica is a widely used sans-serif typeface developed in 1957 by Swiss typeface designer Max Miedinger with input from Eduard Hoffmann. It is a neo-grotesque or realist design, one influenced by the famous 19th century typeface Akzidenz-Grotesk and other German and Swiss designs.
Its use became a hallmark of the International Typographic Style that emerged from the work of Swiss designers in the 1950s and 60s, becoming one of the most popular typefaces of the 20th century. Over the years, a wide range of variants have been released in different weights, widths and sizes, as well as matching designs for a range of non-Latin alphabets.
Helvetica Neue Font
Helvetica Neue is a reworking of the typeface with a more structurally unified set of heights and widths. Other changes include improved legibility, heavier punctuation marks, and increased spacing in the numbers.
Neue Helvetica uses a numerical design classification scheme, like Univers. The font family is made up of 51 fonts including 9 weights in 3 widths (8, 9, 8 in normal, condensed, extended widths respectively), and an outline font based on Helvetica 75 Bold Outline (no Textbook or rounded fonts are available).
The following fonts are the most closer and similar to Helvetica Neue typeface and you can use these fonts for both personal and commercial purpose.