Mysql

Railway is a cloud platform offering a variety of services including databases, with a focus on usage-based pricing to optimize costs. It provides flexible plans for developers and teams, allowing them to pay only for the resources they use.

PlanetScale offers serverless MySQL and Postgres databases with a free tier up to 10GB storage. It provides high-availability clusters, autoscaling storage, and unlimited IOPS. Ideal for developers and enterprises needing scalable database solutions.

TiDB Cloud is a unified distributed SQL database that combines HTAP (Hybrid Transactional/Analytical Processing), vector search, and ACID transactions. It is designed for production AI agents and multi-agent systems, offering horizontal scalability and strong multi-tenant isolation.

TiDB Cloud Starter offers a fully-managed, auto-scaling cloud service designed for dynamic workloads, compatible with MySQL and offering a free tier. It provides 25 GiB of row storage, 25 GiB of column storage, and 250M Request Units (RUs) for free per month for each organization.

Offers managed databases like PostgreSQL, MySQL, and Redis. Relatively affordable options.