Best Free Relational Databases

Postgres for multi-tenant apps — 1 GB storage, 50M serverless query tokens, 500 max connections. Unlimited databases and tenant DBs. Always-on (no cold starts)

Listed in Databases, and on this page because we labelled it relational. We read that on 2026-08-31 from https://www.thenile.dev/, where it says: “Postgres re-engineered for multi-tenant apps.”. How we use this

filess.io is a platform where you can create two databases with up to 10 MB per database of the following DBMS for free: MySQL, MariaDB, MongoDB, and PostgreSQL.

Listed in Databases, and on this page because we labelled it relational. We read that on 2026-08-31 from https://filess.io, where it says: “Ship your full stack apps in seconds. Web Hosting, Managed Databases (MySQL, PostgreSQL, MongoDB, MariaDB & SQL Server) and Secure Tunnels.”. How we use this

Open-source backend with Postgres and Hasura GraphQL, plus Auth, Storage and Functions. The Starter plan is $0 a month: 1 GB database, 1 GB storage and 5 GB egress, with functions, realtime APIs and unlimited users. It is limited to 1 project, and the project is paused after 1 week of inactivity. Pro starts at $25 a month with $15 of compute credits, a 10 GB database, 50 GB storage and 50 GB egress.

Listed in Databases, and on this page because we labelled it relational. We read that on 2026-08-31 from https://nhost.io/, where it says: “Nhost is a managed backend platform with Postgres, GraphQL, Auth, Storage, and serverless Functions.”. How we use this

Edge SQLite — 100 databases, 5 GB storage, 500M rows read/month, 10M rows written/month free. On 2026-10-02 Turso announced that Supabase is acquiring it. Turso says the service keeps running and that databases, APIs and workflows continue as they do today.

• Turso's free plan needs no credit card. (From turso.tech/pricing, read 2026-10-22.)
• The Developer plan costs $5.99 per month, or $4.99 per month when billed yearly. It includes 9GB storage, 2.5 billion rows read, 25 million rows written and 10GB syncs per month. Overage rates are $0.75 per GB storage, $1 per billion rows read, $1 per million rows written and $0.35 per GB syncs. (From turso.tech/pricing.md, read 2026-10-29.)
• Overage billing on a paid plan is off by default. Enabling it lets you go over your plan's included limits and pay per usage. (From turso.tech/pricing.md, read 2026-10-29.)
• On the Free plan, or on a paid plan with Overages off, your databases are blocked once you exceed the limit on any single metric. (From turso.tech/pricing, read 2026-10-29.)
• Databases on the free plan are archived after 10 days of inactivity. The CLI command turso group unarchive <group-name> unarchives them. (From docs.turso.tech/cli/group/unarchive, read 2026-10-29.)

Listed in Databases, and on this page because we labelled it relational. We read that on 2026-08-31 from https://turso.tech/, where it says: “A full SQLite drop-in replacement, built for the agentic future.”. How we use this

Aurora PostgreSQL Serverless on AWS Free Tier — managed PostgreSQL-compatible database with automatic scaling. Free plan: up to 4 ACUs and 1 GiB of storage per cluster, paid from AWS credits ($100 at sign-up, up to $100 more). The Free plan closes after 6 months or when the credits run out

Listed in Databases, and on this page because we labelled it relational. We read that on 2026-08-31 from https://aws.amazon.com/rds/aurora/, where it says: “Amazon Aurora is a global-scale relational database service built for the cloud with full MySQL and PostgreSQL compatibility.”. How we use this

Serverless Postgres with branching — free tier includes 100 CU-hours/month per project, 1 GB of Postgres storage per project (20 GB total across all projects), 5 GB of public network transfer per project per month, up to 100 projects, 10 branches per project, Neon Auth (60K MAU), auto-scaling up to 2 CU, scale-to-zero, 5 GB of Object Storage, and Functions (10 active capacity-hours, 400 waiting capacity-hours, 1M invocations). No credit card is required. The AI Gateway (one Neon credential for models from OpenAI, Anthropic, Google and others) is available on every plan, including Free. It requires a card and a $5 minimum purchase of prepaid credits in the Neon Console. The Free plan otherwise remains unchanged. Model prices match each provider's list price with no markup.

• Neon's Free plan needs no credit card. (From neon.com/pricing, read 2026-10-22.)
• An agent can create a Neon Postgres project without a Neon account. Unclaimed projects expire in 72 hours and are limited to 100 MB storage and 1 GB transfer. A person claims the project to keep it. (From neon.com/docs/reference/claimable-neon, read 2026-10-22.)
• On the Free plan, scale to zero can't be disabled: computes suspend after 5 minutes of inactivity. (From neon.com/docs/introduction/plans, read 2026-10-04.)
• Neon doesn't pause Free projects for inactivity: an idle database starts again on the next query, with no restore step. (From neon.com/pricing, read 2026-11-01.)
• Running out of CU-hours or network transfer suspends the compute until the next billing period or an upgrade. (From neon.com/docs/introduction/plans, read 2026-10-04.)
• Neon's Free plan provides 100 CU-hours per project per month. One CU allocates about 4 GB of RAM, and 100 CU-hours is enough to run a 0.25 CU compute (about 1 GB of RAM) for 400 hours, about 17 days of continuous running. All computes in a project count toward usage, including those for each branch and any read replicas. (From neon.com/docs/introduction/plans, read 2026-11-03.)
• At the storage cap, inserts, updates and deletes fail until space is freed or the plan is upgraded. (From neon.com/docs/introduction/plans, read 2026-10-04.)
• Neon's Azure East US 2, West US 3, and Germany West Central regions no longer accept new projects as of April 7, 2026; Free-plan projects there inactive for 90+ days may be deleted after October 5, 2026. (From neon.com/docs/import/azure-regions-deprecation, read 2026-10-07.)
• Platforms that create databases for their users can apply for the Agent Plan. You must have a Neon Scale plan with a credit card on file and get Neon's approval. Neon sponsors the databases for your free-tier users. Paid usage gets up to $25,000 in credits and compute at $0.106 per compute-unit hour. (From neon.com/docs/introduction/agent-plan.md, read 2026-10-11.)
• Neon gives $20 in free credits to try paid features, claimed through a promo link in the Neon Console. (From neon.com/pricing.md, read 2026-10-11.)
• Neon's pricing page offers startups up to $100k in credits. The startup page describes the Databricks Startup Program, up to $200K in credits for Neon and Databricks for qualifying startups. (From neon.com/startups, read 2026-10-11.)
• Neon's open source programme: Neon reviews each application and decides per project whether to support it with a monthly cash sponsorship through GitHub Sponsors, Neon credits, or both, and how much. Cash sponsorships come from a pool of at least $200,000 a year and run for six-month terms that do not renew automatically. Supported projects can receive up to $5,000 in Neon credits and up to $5,000 in Neon AI Gateway credits. It requires an OSI-approved license and a GitHub Sponsors profile. (From neon.com/programs/open-source.md, read 2026-10-29.)
• After the free plan, Neon's paid plans bill only for usage, with no monthly minimum: Launch charges $0.106 per CU-hour of compute and Scale $0.222, both charge $0.35 per GB-month of storage, extra branches cost $1.50 per branch-month, and network transfer beyond 500 GB per project costs $0.10 per GB. (From neon.com/pricing.md, read 2026-10-15.)
• Neon Realtime has been in public beta since 2026-10-15. It provides live updates from SQL queries without polling and is free during the beta. Compute and egress are billed under the plan; beta runs in four AWS regions: us-east-1, us-east-2, eu-central-1 and ap-southeast-1. (From neon.com/docs/realtime/overview, read 2026-10-16.)
• Neon archives branches older than 14 days and not accessed for 24 hours. Unarchiving happens automatically when a branch is connected to or queried. Branches with large amounts of data may connect and query slower while unarchiving. (From neon.com/docs/guides/branch-archiving, read 2026-10-29.)

Listed in Databases, and on this page because we labelled it relational. We read that on 2026-08-31 from https://neon.com/, where it says: “The backend for apps and agents. Build with Lakebase Postgres, Auth, Functions, Storage, and an AI Gateway: instant, branchable, serverless.”. How we use this

SQLite at the edge — 5M rows read/day, 100K rows written/day, 5 GB total storage. Resets daily at midnight UTC

• On the Free plan, once the account reaches its daily read or write limit, D1 refuses queries and returns errors until the limits reset at 00:00 UTC; upgrading to Workers Paid removes the limits. (From developers.cloudflare.com/d1/platform/pricing, read 2026-10-20.)
• On the Free plan a single D1 database can hold at most 500 MB, and an account can have at most 10 databases, within the 5 GB account total. (From developers.cloudflare.com/d1/platform/limits, read 2026-10-20.)
• Cloudflare D1's free plan needs no credit card. (From cloudflare.com/developer-platform/products/d1, read 2026-10-22.)
• D1 usage past Free limits requires the Workers Paid plan. That plan has a minimum charge of $5 per month per account. (From developers.cloudflare.com/workers/platform/pricing, read 2026-10-29.)
• The Workers Paid plan includes 25 billion rows read, 50 million rows written, and 5 GB storage monthly. Rows read overage is $0.001 per million. Rows written overage is $1.00 per million. Storage overage is $0.75 per GB-mo. There are no egress charges. (From developers.cloudflare.com/d1/platform/pricing, read 2026-10-29.)
• Time Travel restores a database from up to 30 days ago on Workers Paid and 7 days on Free. The paid plan has a 10 GB maximum database size and 1 TB storage per account. (From developers.cloudflare.com/d1/platform/limits, read 2026-10-29.)

Listed in Databases, and on this page because we labelled it relational. We read that on 2026-08-31 from https://developers.cloudflare.com/d1/, where it says: “Build serverless SQL databases on Cloudflare”. How we use this

Open-source Postgres platform (Apache 2.0) with copy-on-write branching and scale-to-zero. Self-hosted on Kubernetes — free forever. The managed platform, Xata Cloud, is paid: from $0.012 an hour plus $0.28 per GB-month of storage, billed by the minute, with a 14-day free trial.

• Xata announced on November 9, 2026 that it is joining ClickHouse. Xata continues to accept new sign-ups and customers can use it as usual. Xata will eventually migrate customers to ClickHouse Managed Postgres after feature parity. Xata did not give a date for the migration. (From xata.io/blog/xata-is-joining-clickhouse, read 2026-11-10.)

Listed in Databases, and on this page because we labelled it relational. We read that on 2026-08-31 from https://xata.io/, where it says: “Postgres platform with instant branching and scale-to-zero compute.”. How we use this

Multi-model cloud database — The 'Start' plan offers 1GB of storage free, forever, and a free compute instance with 0.25 vCPU and 1 GB memory ($0.000/hr). Further instances are available from $0.021/hr.

Listed in Databases, and on this page because we labelled it relational. We read that on 2026-08-31 from https://surrealdb.com/, where it says: “SurrealDB is a database and an agent memory layer. Documents, graphs, vectors, and SQL in one engine - and context for your AI agents wherever your data lives.”. How we use this

Managed PostgreSQL, MySQL, Valkey (Redis-compatible), Apache Kafka, or OpenSearch — one free service of each type per organization. PostgreSQL and MySQL: 1 CPU, 1 GB RAM, 1 GB disk; PostgreSQL has 20 connections and no connection pooling. Valkey: 1 CPU, 1 GB RAM. Apache Kafka: 250 KiB/s ingress and 250 KiB/s egress, up to 5 topics with two partitions each. OpenSearch: 4 GB RAM, 20 GB storage. No credit card, no time limit. Developer plan for PostgreSQL is $5 a month with 8 GB storage.

• Aiven may power off a free service that has no usage in its first few hours, or that has no continuing activity. Aiven sends a notification before powering off an inactive service. The service can be powered back on. (From aiven.io/docs/platform/concepts/service-pricing, read 2026-10-18.)

Listed in Databases, and on this page because we labelled it relational. We read that on 2026-08-31 from https://aiven.io/postgresql, where it says: “Aiven for PostgreSQL - Managed Postgres database service with Postgres extensions, database forking, connection pooling.”. How we use this

Distributed SQL database for time-series and IoT — free cloud tier (CRFREE): 2 vCPUs, 2 GB RAM, 8 GB storage. One free cluster per org. No credit card required

Listed in Databases, and on this page because we labelled it relational. We read that on 2026-08-31 from https://cratedb.com/, where it says: “CrateDB is the operational analytics database for fast-moving data. Ingest millions of events per second and query billions of records in milliseconds. Standard SQL, no pre-aggregation, no schema redesign.”. How we use this

Postgres development platform: database, Auth, Storage, Realtime and Edge Functions. The Free plan is $0: unlimited API requests, 50,000 monthly active users, a 500 MB database on a shared CPU with 500 MB RAM, 5 GB egress plus 5 GB cached egress, 1 GB file storage, 500,000 Edge Function invocations, and Realtime with 200 concurrent connections and 2 million messages a month. Free projects are paused after 1 week of inactivity, with a limit of 2 active projects. Pro starts at $25 a month for the first project and includes $10 a month of compute credits, enough for one Micro instance.

• Supabase makes daily backups only for Pro, Team and Enterprise projects, so a free project has none, and Supabase recommends exporting it yourself with the CLI's db dump command. (From supabase.com/docs/guides/platform/backups, read 2026-10-05.)
• A paused project can be restored from the dashboard for 1 year. After that, only its backup file and Storage objects can be downloaded. (From supabase.com/docs/guides/platform/upgrading, read 2026-10-05.)
• Supabase notifies you when you exceed the Free Plan quota. Continued overuse brings restrictions that can include a read-only database, 402 responses to every API request, or paused projects. They lift when the quota refills next billing cycle or on upgrade to Pro. (From supabase.com/docs/guides/platform/billing-faq, read 2026-10-05.)
• Supabase's Free Plan needs no credit card; paid plans require one on file. (From supabase.com/docs/guides/platform/get-set-up-for-billing, read 2026-10-22.)

Listed in Databases, and on this page because we labelled it relational. We read that on 2026-08-31 from https://supabase.com/, where it says: “Build production-grade applications with a Postgres database, Authentication, instant APIs, Realtime, Functions, Storage and Vector embeddings.”. How we use this