Microsoft Azure vs Fly.io

• Fly-io pricing starts significantly lower at $1.94/mo for 0.256 GB of RAM, while Azure’s entry-level managed database instance commands $7.59/mo for 1 GB of RAM.
• Expanding storage on Azure costs $0.12/GB, which is slightly cheaper than the $0.15/GB charged by Fly-io for additional disk allocations.
• Egress costs show a stark difference, with Azure charging $0.09/GB compared to the highly competitive $0.02/GB rate at Fly-io.
• Both providers cap high-end standard instances at 16 GB of RAM and 4 vCPU cores, though Azure provides up to 250 GB of storage versus Fly-io’s 160 GB limit.

Azure operates on a traditional enterprise model typical of legacy cloud incumbents, favoring consistent, predictable workloads that align with their standard managed PostgreSQL and MySQL offerings. The pricing structure here is built for teams that require deep integration with existing virtual networks and established backup policies. While the monthly floor is higher, the inclusion of more substantial baseline storage helps stabilize costs for medium-sized datasets that do not require constant disk expansion.

Fly-io utilizes a more modern, distributed approach, often relying on Firecracker microVMs that feel lighter than Azure’s rigid instance tiers. Their aggressive egress pricing makes them a better fit for database-backed applications that transmit high volumes of data to end users. Azure remains the safer choice for organizations already committed to the Microsoft ecosystem or those requiring strict compliance frameworks that rely on specific regional data residency guarantees. Fly-io is more effective for developers who need to spin up and tear down instances frequently, provided the storage requirements remain within their 160 GB ceiling.

Choosing between these two depends on whether your architecture prioritizes lower egress overhead and rapid scaling on Fly-io or the higher baseline storage capacity and legacy enterprise reliability provided by Azure.