Quantum Fiber vs Xfinity
Quantum Fiber ranks higher on our formula, 80 to 67 on each provider's best plan. It is also cheaper over two years (from $50/mo all-in) and sells the faster top plan (8 Gbps).
Prices last checked September 2026.
Side by side
Quantum Fiber and Xfinity compared
Real cost is the two-year monthly average with the promo step-up, equipment rental and installation folded in.
| Measure | Quantum Fiber | Xfinity |
|---|---|---|
| Technology | Fiber | Cable, Fiber |
| Fastest plan | 8 Gbps | 2 Gbps |
| Upload on fastest plan | 8 Gbps | 300 Mbps |
| Lowest advertised price | $50/mo | $30/mo |
| Lowest real cost | $50/mo | $60/mo |
| Price steps up after promo | No | On some plans |
| Data caps | None | On some plans |
| Contracts | None required | None required |
| Equipment fee | Included | Up to $15/mo |
| States served | 19 | 40 |
| Our rating (best plan) | 80/100 | 67/100 |
Plans
Every plan from both
Quantum Fiber
FiberNot yet checked- 500 Mbps500 Mbps · $50/mo · real $50
- 940 Mbps940 Mbps · $75/mo · real $75
- 2 Gig2 Gbps · $95/mo · real $95
- 8 Gig8 Gbps · $165/mo · real $165
Xfinity
CableFiberOut of date — checked Sep 11, 2026- Connect150 Mbps · $30/mo · real $60
- Fast500 Mbps · $55/mo · real $85
- Superfast800 Mbps · $65/mo · real $80
- Gigabit1.1 Gbps · $75/mo · real $90
- Gigabit X22 Gbps · $95/mo · real $95
Honest assessment
Where each one wins
Quantum Fiber
- Symmetrical up to 8 Gig
- No annual contract
- Price does not step up
- Build is patchy inside its own metros
- Install lead times
- Support is shared with CenturyLink
Xfinity
- Available in 40 states
- Multi-gig tiers in most markets
- No contract on most plans
- Price rises after 12–24 months
- Slow upload on non-fiber tiers
- 1.2 TB data cap in many regions
Head to head
Cities where Quantum Fiber and Xfinity compete
Markets where we have both on record. Each page ranks every provider there.
Questions
Quantum Fiber vs Xfinity, answered
Is Quantum Fiber or Xfinity better?
Quantum Fiber ranks higher on our formula, 80 to 67 on each provider's best plan. It is also cheaper over two years (from $50/mo all-in) and sells the faster top plan (8 Gbps).
Which is cheaper, Quantum Fiber or Xfinity?
Quantum Fiber has the lower real cost: $50 a month averaged over two years with fees included, against $60 for Xfinity. The advertised entry prices are $50 for Quantum Fiber and $30 for Xfinity.
Which is faster, Quantum Fiber or Xfinity?
Quantum Fiber sells the faster top plan, at 8 Gbps down and 8 Gbps up. Xfinity tops out at 2 Gbps down and 300 Mbps up. For most households upload speed matters more than the headline download figure.
Where can I get both Quantum Fiber and Xfinity?
We have both on record in 18 markets, including Tucson, AZ; Seattle, WA; Spokane, WA; Tacoma, WA; Bellevue, WA. Availability still varies street by street.
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