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 is a fully managed, multi-tenant TiDB offering. It delivers an instant, autoscaling MySQL-compatible database and offers a generous free quota and consumption based billing once free limits are exceeded. The free plan is ideal for those who are getting started with TiDB Cloud Starter. It provides developers and small teams with the following essential features: No cost: This plan is free when usage is within the free quota. No credit card is required to get started. Storage: Provides an initial 5 GiB of row-based storage and 5 GiB of columnar storage. Request Units: Includes 50 million Request Units (RUs) for database operations.

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