Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
BigQuery on Google Cloud¶
The free tier seems to be good enough for most personal use cases.
1TB of querying per month
10GB storage per month
Amazon Always Free Offers¶
Amazon DynamoDB
Free with the AWS Free Tier
25G storage
25 WCU
25 RCU
200M requests per month
DigitalOcean Managed Database¶
Fully managed MongoDB, MySQL, Redis, and PostgreSQL database engines to give your application the performance it needs without the operational overhead of managing your own database server.
Starts from $15/month.