AWS

Amazon Quantum Ledger Database (QLDB)

Amazon Quantum Ledger Database is a fully managed ledger database provided by AWS. It is designed to track every change to data, ensuring an immutable and tamper-evident history. This service is primarily used for applications requiring a transparent and verifiable record of transactions, such as financial systems or supply chain management, where data integrity and auditability are critical requirements for the business logic.

You should choose QLDB when you need a reliable, centralized ledger without managing underlying infrastructure. However, be aware that this service operates on a pay-as-you-go pricing model and offers no free tier. This means there are no complimentary usage allowances to test the service, so costs will accrue immediately upon creation, making it essential to monitor usage closely from the start to avoid unexpected charges.