Fidium vs. Underline

Whether you’re researching Fidium vs. Underline internet service at your current address, comparing internet options for potential locations, or just researching alternatives, this detailed comparison will help you understand which provider best suits you.

Fidium and Underline compete directly in approximately 0.00% of their service areas, with Fidium covering 5,181,125 people nationwide and Underline serving 131,401. Fidium primarily delivers internet through a DSL connection; Underline specializes in fiber connections. Jump directly to specific sections using the links below, or continue reading for our comprehensive comparison of Fidium and Underline's availability, speeds, pricing, and customer satisfaction.

Jump to: Availability | Speeds | Plans & Pricing | Customer Reviews | Fees

Fidium vs. Underline | Pros & Cons

Fidium vs. Underline | Availability

Fidium and Underline have distinct coverage footprints across the United States. Our interactive map shows exactly where each provider offers service and where they overlap, helping you understand your options.

Both Providers Available | Fidium Available | Underline Available | No Coverage

Fidium currently offers internet service in 2,397 cities and 200 counties across 21 states, reaching approximately 5,181,125 residents. Their service area includes major markets like Sacramento, CA; Portland, OR; and Houston, TX. By comparison, Underline serves 131,401 residents in 4 cities and 1 counties in 1 state, with a presence in population centers such as Colorado Springs, CO; Security-Widefield, CO; and Fountain, CO.

Internet availability can vary significantly even within specific cities and zip codes. For the most accurate information about Fidium and Underline at your location, use our address search tool:

Fidium vs. Underline | Speeds & Technology

Fidium and Underline utilize different network technologies to deliver internet service, resulting in varying speed capabilities across their service areas.

Across their service areas, Fidium primarily delivers internet through DSL, available to 68.1% of their customers. They also offer fiber to 61.6% of their coverage area. Underline relies on fiber technology, which comprises 100.0% of their network, this is the only connection type they offer.

In terms of potential speeds across the country, Fidium offers higher overall speeds, with speeds for most covered areas averaging 1,171 Mbps compared to Underline's average speed of 1,000 Mbps. When examining their overlapping service areas, Fidium delivers faster speeds in 0.00% of locations where both providers operate, similar speeds in 0.00%, and slower speeds in 0.00%.

The availability of each provider's fastest technology varies significantly by location. Fidium's premium Fiber service reaches 61.6% of their coverage area. Meanwhile, Underline's top-tier Fiber is available to 100.0% of their footprint. Even within the same technology type, speed offerings can vary based on local infrastructure investments.

Fidium vs. Underline | Plans & Pricing

Below are the current internet plans and pricing details for Fidium, sourced directly from FCC-mandated machine-readable broadband labels to ensure transparency and accuracy. Unfortunately, Underline has not complied with FCC requirements to provide their broadband label data, limiting transparency and the ability for consumers to make direct comparisons.

We've included the available Fidium plan details below to help you understand their offerings while we await Underline's compliance with federal transparency requirements.

Fidium Plans

Underline Plans

Most households with 3-5 users need download speeds of at least 100 Mbps for smooth streaming, video conferencing, and everyday internet usage. Larger households or those with heavy users (gamers, 4K streamers, or remote workers) should consider plans with speeds of 300 Mbps or more for optimal performance.

Any prices listed are the base service rates and may not include additional charges such as equipment fees, installation costs, or other service-related expenses. For a comprehensive view of all potential charges, refer to our Fees & Details section below.

Fidium vs. Underline | Customer Ratings & Reviews

Compare how real customers rate Fidium and Underline based on our comprehensive database of verified customer reviews across all service types.

When comparing customer satisfaction, Fidium earns an overall rating of 3.80 / 5 stars from 70 customer reviews, while Underline maintains a 0.00 / 5 rating from 0 reviews. Underline outperforms Fidium by 0.00 points in overall satisfaction. Fidium's best-rated service is their fiber offering at 4.10 / 5 stars, compared to Underline's highest-rated service, , at 0.00 / 5 stars.

When comparing internet providers, remember that advertised prices rarely tell the complete story. Equipment fees alone can add $10-15 per month to your bill, while installation charges, early termination fees, and data overage penalties can significantly increase your total cost of service. Consider these additional costs alongside monthly rates when determining which provider offers the better value for your specific needs.

Fidium vs. Underline | Top Cities

Fidium serves 2,397 cities while Underline is available in 4 cities nationwide. The tables below highlight their largest markets and areas where customers can choose between both providers.