Which is cheaper, FusionAuth or Stack Auth?

FusionAuth is 1.3x cheaper than Stack Auth. FusionAuth starts at $0/mo, Stack Auth starts at $0/mo.

Does FusionAuth have a free tier?

Yes, FusionAuth offers a free tier with .

FusionAuth has moderate switching cost. Stack Auth has drop-in switching cost. Stack Auth is easier to switch away from.

Auth

FusionAuth

← More affordable

Full-featured auth platform with self-hosting option and MAU-based cloud pricing

Switching Cost: moderate

Stack Auth

Open-source Auth0/Clerk alternative with managed hosting or free self-hosting, built for Next.js

Switching Cost: drop-in

The pricing gap between FusionAuth and Stack Auth runs about 1.3x — significant consideration for scaling.

You'll notice different pricing structures: tiered for FusionAuth versus per-seat for Stack Auth.

Teams prioritizing vendor flexibility should choose {winner} — lower switching costs preserve your future options.

Teams prioritizing vendor flexibility should choose {winner} — lower switching costs preserve your future options.

Price Difference

1.3x

FusionAuth is cheaper by $12/mo

Pricing Model

Different

Tools charge using different pricing philosophies

Switching Costs

Stack Auth

Lower switching costs for easier migration