InfluxDB is an open source time-series database for metrics, events, and real-time analytics — a self-hostable alternative to Datadog and Amazon Timestream, built in Rust on Apache Arrow and Parquet with SQL and InfluxQL query support.

What is InfluxDB?

InfluxDB is an open source time-series database built to ingest and query timestamped data — server metrics, IoT sensor readings, application events, and financial ticks — at high throughput. The current major version, InfluxDB 3, is written in Rust and built on Apache Arrow, DataFusion, and Parquet, and you can self-host it for free or run it as a managed cloud service.

What is InfluxDB best for?

InfluxDB is best for teams collecting large volumes of timestamped measurements that need fast writes and quick time-window queries — monitoring dashboards, IoT and sensor pipelines, real-time application analytics, and network or infrastructure metrics. It fits any workload where data arrives continuously and questions are usually “what happened over this time range,” rather than transactional record-keeping that a relational database handles better.

What can InfluxDB do?

Store time-series at scale with high-throughput writes and columnar Parquet persistence to local disk or object storage (Amazon S3, Azure Blob, Google Cloud Storage).
Query in SQL, InfluxQL, or Flight SQL — InfluxDB 3 adds native SQL alongside the older InfluxQL dialect.
Return last-value queries in under 10ms, tuned for live dashboards and interactive systems.
Run embedded Python plugins via a built-in Python VM for in-database processing, transforms, and alerts.
Stay compatible with existing tooling — it accepts InfluxDB 1.x and 2.x write APIs, so most existing writers keep working.
Collect data with Telegraf, InfluxData’s open source agent with 300+ input plugins for metrics and events.
Feed dashboards through native integration with Grafana and other visualization layers.

Where does InfluxDB fall short?

The open source edition, InfluxDB 3 Core, is single-node only and limits query time ranges to roughly the last 72 hours — it has no compactor, so it isn’t built to query far back into historical data. Longer-range historical queries, multi-node clustering, and high availability require InfluxDB 3 Enterprise (free for at-home/non-commercial use, paid for production) or a Cloud plan.

InfluxDB has also churned through query languages across versions — v1 used InfluxQL, v2 pushed Flux, and v3 pivoted to SQL while deprecating Flux — so dashboards and scripts written for an earlier version often need rework when you upgrade. And as a purpose-built time-series store, it’s a poor fit for relational or transactional workloads; reach for Postgres or a general database there instead.

Is InfluxDB free?

Yes — InfluxDB 3 Core is open source (dual-licensed MIT or Apache 2.0) and free to self-host with no seat or usage limits. InfluxDB 3 Enterprise is also free for personal, at-home use but requires a paid license for commercial production. The managed options — InfluxDB Cloud Serverless (freemium, pay-as-you-go) and Cloud Dedicated — are commercial services billed by usage.

What does InfluxDB replace?

InfluxDB is a self-hosted stand-in for paid, usage-billed monitoring and time-series services. It’s an open source Datadog alternative for teams that want to store and query metrics on their own infrastructure instead of paying per-host, an Amazon Timestream alternative that isn’t locked to AWS, and can absorb metrics and event workloads teams would otherwise send to Splunk. For OLAP-style reporting over billions of rows, a column store like ClickHouse may fit better.

FAQ

Is InfluxDB open source? Yes. InfluxDB 3 Core is open source under a dual MIT / Apache 2.0 license, and the source lives on GitHub. InfluxDB 3 Enterprise and the Cloud editions are commercial products built on top of it.

Can I self-host InfluxDB for free? Yes. InfluxDB 3 Core is free to download and self-host on your own hardware or object storage. Just note Core is single-node and query ranges are capped around 72 hours; historical queries and clustering need Enterprise or Cloud.

Is InfluxDB a good Datadog alternative? For metrics and time-series storage, yes — you own the data and avoid per-host billing. But InfluxDB is a database, not a full observability suite: you’ll pair it with a collector like Telegraf and a dashboard tool like Grafana to match Datadog’s out-of-the-box experience.

What do I need to run InfluxDB? A single Linux, macOS, or Windows host (or a Docker container) plus storage — either local disk or an S3-compatible object store. Telegraf is optional but the common way to feed it metrics and events.