That’s correct. FerretDB and DocumentDB both pursue PostgreSQL-based document models.
EloqDoc follows a fundamentally different architectural path. Instead of executing in Postgres, we leverage the existing MongoDB parser and executor to ensure maximum compatibility. Our main contribution is to replace the single-writer WiredTiger storage engine entirely with Data Substrate.
The Data Substrate is an abstract layer built specifically to handle distributed database fundamentals: scalable buffer pooling, concurrency control, durability, elasticity, and fault tolerance. You can read more: https://www.eloqdata.com/blog/2025/07/14/technology
This architectural choice is what enables EloqDoc to deliver features that Postgres-based solutions cannot easily match, including: full compatibility, native Multi-Writer capability, Object Storage First and extremely low-latency distributed transactions.
