Meltano
Meltano is an open-source ELT orchestrator that assembles pipelines from Singer taps and targets declaratively in version-controlled YAML, with a hub cataloguing over 600 community-maintained connectors.
LicenseOpen source (permissive)· MIT
DeploymentSelf-hostedManaged
PricingFreeSubscription
Operational complexityMedium
WorkloadBatch
LanguagePython
Use it when
- Pipelines should live in version control as YAML, reproducible on any machine, and reviewed like code.
- The Singer ecosystem covers your sources; MeltanoHub catalogs over 600 taps and targets, plus Airbyte connectors via an adapter.
- A niche source will need a custom connector; the Meltano SDK makes writing a tap tractable.
- dbt should run in the same pipeline as extract-and-load, as a transformer plugin.
Think twice when
- Connector quality matters more than coverage: Singer taps are mostly community-maintained and vary widely, where Fivetran maintains everything it ships.
- Nobody wants to operate pipelines; Meltano is CLI-first and self-hosted, with no web UI since 3.0.
- Sub-hourly or streaming freshness is needed; Singer replication is batch.
How it runs
A Meltano project is a YAML file plus the CLI, run wherever you deploy it: containers, CI, or a scheduler. Built-in schedules delegate execution to cron, Airflow, or Dagster via plugins. Incremental state follows Singer replication modes (INCREMENTAL, LOG_BASED, or FULL_TABLE per stream). The tool itself is MIT-licensed and free; managed offerings meter compute hours.
Details
CompareHow Meltano answers the questions Batch ELT turns on.
Batch ELT
| How it works | |
| Authoring model | Declarative YAML in version control; CLI-only since 3.0 |
| Incremental sync | Singer replication: INCREMENTAL, LOG_BASED or FULL_TABLE per stream |
| Sync frequency | Cron intervals via meltano schedule, executed by Airflow or Dagster |
| Schema drift | Carried in Singer SCHEMA messages; the target decides what happens |
| Running it | |
| Scheduling | Built-in schedules; Airflow and Dagster as plugins |
| Connections | |
| Source coverage | SaaS APIs, databases and files, from the Singer ecosystem |
| Destinations | Warehouses, databases and object storage, via Singer targets |
| Custom connectors | Meltano SDK; a Singer tap in any language |
| Transformations | dbt as a transformer plugin, run in the same pipeline |
| Cost | |
| Billing unit | Free self-hosted; managed tiers metered in compute hours |
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