Amazon Timestream vs GreptimeDB

Amazon Timestream is a managed cloud service offering time-series database engines for low-latency queries and large-scale ingestion. Timestream for LiveAnalytics scales ingestion, storage and query capacity independently and can process millions of queries. Memory and magnetic tiers support retention rules that move data and delete older records. Timestream for InfluxDB 3 Enterprise supports clusters of up to 15 nodes assigned to ingestion, query or compaction work. Backups can run hourly, daily, weekly, monthly or on a custom cron schedule, with retention from one to 365 days; on-demand backups can remain for up to 3,650 days. AWS states that data is encrypted by default and documents IAM, KMS and AWS Backup integrations. Ingestion options include SDKs, CLI, WriteRecords API, Lambda, IoT Core, Kinesis, MSK, Managed Service for Apache Flink and Telegraf. SQL, Flux and InfluxQL are supported query languages.

GreptimeDB is an open-source observability database for storing and querying metrics, logs, and traces through a columnar engine and shared SQL layer. It targets append-heavy, time-indexed workloads such as observability and IoT data, rather than general-purpose transactional database work. Users can query signal tables with SQL and metrics with PromQL. Ingestion options include Prometheus Remote Write, OpenTelemetry OTLP/HTTP, Loki Push API, Elasticsearch Bulk API, InfluxDB Line Protocol, MySQL, PostgreSQL, gRPC, and HTTP. Documented integrations include Prometheus, Grafana, Kafka, Apache Flink, Apache Spark, Telegraf, EMQX, and Fluent Bit. It can run standalone or as a horizontally scalable cluster, with Helm charts, Docker images, and binaries for macOS, Linux, Windows, and Android ARM64. The open-source edition lists username/password authentication, user-level read/write access control, and TLS/SSL connections. Enterprise adds features including LDAP, fine-grained RBAC, audit logging, and encryption at rest. The fully managed Enterprise plan costs $290 a month. Open-source users receive community support through Slack and GitHub.