High Voltage

High Voltage is a science-based SEO agency founded in 2014 that positions free organic Google traffic as the cheapest and most consistent marketing channel for business growth. The agency's core claim is that since Google does not publish its ranking factors, SEOs must either run tests or guess, and High Voltage has conducted over 400 tests to learn how the algorithm works. High Voltage also holds a US Patent for a proprietary system used to isolate single factors in Google's algorithm.

The agency employs between 50 and 99 people and is headquartered at Harzer Str. 39, Berlin, Germany, with a second office at 97 White Oaks Drive, Springfield, Illinois, United States. Minimum budget and average hourly rate are listed as available on request.

High Voltage offers services in SEO, digital marketing, and conversion rate optimization. The agency's methodology emphasizes testing over guessing, and it encourages prospective clients to ask any SEO provider whether they test or guess when optimizing for Google.

Clients listed on the profile include MXC, Intersport, and Coinjar. One Google reviewer from a personnel service provider in nursing and medicine described the agency's work as geared toward the future of a project with clear objectives, and noted a huge increase in organic clicks after link building, with rankings improving every month.

Google reviews average 3.7 out of 5 across three reviews. Positive reviewers call the team professional, cutting edge, and highly recommended, while one negative review criticizes the agency's frequent follow-up email marketing.

Representative results include helping an e-commerce company increase sales by 15% despite a 10% drop in traffic, according to a follow-up email quoted in a negative review.