{"slug":"postgresql","name":"PostgreSQL","domain":null,"verdict":"As of 2026-07-19, ChatGPT, Claude, Gemini, Grok collectively rank PostgreSQL first for database for multi-tenant saas (one of 2 leaderboards it appears on). Source: https://modelsagree.com/product/postgresql (modelsagree.com, CC BY 4.0).","best_rank":1,"categories":2,"brief":{"category":"best-database-for-multi-tenant-saas","title":"Best Database for multi-tenant SaaS","rank":1,"of":9,"top":null,"day":"2026-07-19","why":[{"t":"row-level security","m":["Claude","Gemini","ChatGPT"],"q":"database-enforced tenant isolation through row-level security"},{"t":"flexible isolation models","m":["Claude","Gemini","ChatGPT"],"q":"flexible isolation models (pooled schema, schema-per-tenant, or extension-based sharding via Citus)"},{"t":"unbeatable ecosystem","m":["Claude","Gemini","ChatGPT"],"q":"an unbeatable ecosystem"},{"t":"mature ACID transactions","m":["ChatGPT"],"q":"mature ACID transactions, rich SQL and extensions, excellent tooling, low cost"}],"gap":[],"fix":[{"t":"horizontal write scaling","m":["Claude","Gemini","ChatGPT"],"q":"Native horizontal write scaling and large database-per-tenant fleet management require extra infrastructure."},{"t":"complex manual sharding","m":["Claude","Gemini"],"q":"requiring complex manual sharding or third-party middleware once single-node hardware limits are exceeded."},{"t":"cross-tenant-leak footgun","m":["Claude"],"q":"RLS misconfiguration is a real cross-tenant-leak footgun"}]},"entries":[{"slug":"best-database-for-multi-tenant-saas","title":"Best Database for multi-tenant SaaS","rank":1,"of":9,"score":15,"appearances":3,"modelRanks":{"ChatGPT":1,"Claude":1,"Gemini":1},"reason":"Best default for typical SaaS: mature ACID transactions, rich SQL and extensions, excellent tooling, low cost, and database-enforced tenant isolation through row-level security; supports shared-table, schema, and database-per-tenant designs.","reasons":[{"model":"ChatGPT","reason":"Best default for typical SaaS: mature ACID transactions, rich SQL and extensions, excellent tooling, low cost, and database-enforced tenant isolation through row-level security; supports shared-table, schema, and database-per-tenant designs."},{"model":"Claude","reason":"Row-level security plus schema-per-tenant options make it the most battle-tested foundation for tenant isolation; the ecosystem (Citus, pgBouncer, every ORM's multi-tenancy tooling) and availability as managed offerings on every cloud mean the typical SaaS team gets isolation, compliance answers, and hiring pool in one choice; assumed the practitioner is a small-to-mid SaaS team without a dedicated database group"},{"model":"Gemini","reason":"Native Row-Level Security (RLS), flexible isolation models (pooled schema, schema-per-tenant, or extension-based sharding via Citus), and an unbeatable ecosystem make it the default high-value choice; assumes standard relational access patterns where single-node performance with connection pooling covers the vast majority of SaaS lifecycles."}],"fixes":[{"model":"ChatGPT","fix":"Native horizontal write scaling and large database-per-tenant fleet management require extra infrastructure."},{"model":"Claude","fix":"Vanilla Postgres does not shard horizontally by itself — past a few TB or tens of thousands of very active tenants you must bolt on Citus, partitioning discipline, or migrate, and RLS misconfiguration is a real cross-tenant-leak footgun"},{"model":"Gemini","fix":"Reaches a vertical scaling ceiling requiring complex manual sharding or third-party middleware once single-node hardware limits are exceeded."}],"updated":"2026-07-19","api":"https://modelsagree.com/api/v1/best/best-database-for-multi-tenant-saas.json"},{"slug":"best-document-database-for-modern-applications","title":"Best document database for modern applications","rank":6,"of":8,"score":4,"appearances":1,"modelRanks":{"Claude":2},"reason":"For most teams the pragmatic best value — JSONB with GIN indexing, SQL/JSON path queries, and full ACID gives 80–90% of a document store inside a true open-source database you likely already run, avoiding a second system; ecosystem (RDS, Supabase, Neon, extensions) is unmatched. Ranked #2 on the assumption the practitioner values operational consolidation over pure document-native ergonomics.","reasons":[{"model":"Claude","reason":"For most teams the pragmatic best value — JSONB with GIN indexing, SQL/JSON path queries, and full ACID gives 80–90% of a document store inside a true open-source database you likely already run, avoiding a second system; ecosystem (RDS, Supabase, Neon, extensions) is unmatched. Ranked #2 on the assumption the practitioner values operational consolidation over pure document-native ergonomics."}],"fixes":[{"model":"Claude","fix":"Not document-native — no schema-per-document ergonomics, clumsier partial updates of nested documents, and horizontal write scaling requires Citus or manual sharding."}],"updated":"2026-07-20","rank_history":{"days":["2026-07-19","2026-07-20"],"ranks":[5,null]},"api":"https://modelsagree.com/api/v1/best/best-document-database-for-modern-applications.json"}],"page":"https://modelsagree.com/product/postgresql","check":"https://modelsagree.com/check?q=PostgreSQL","updated":"2026-07-21T00:03:04.167Z","attribution":"modelsagree.com, CC BY 4.0"}