20 of these carry no recorded demerit and are indistinguishable under every signal we hold; their order rotates daily. 3 are demoted with the reason named, and 1 are listed last because they are not generally available or are not a free offer. How we rank.
Free
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…
Databases
Read and confirmed 2026-11-02
Open Source
Open-source AI-native embedding database (Apache 2.0). Chroma Cloud, its hosted service, is winding down: read-only from December 7, 2026, no reads from December 22, 2026.
Databases
Read and confirmed 2026-11-07
Free
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.)
Databases
Read and confirmed 2026-10-26
Free
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.
Databases
Read and confirmed 2026-11-03
Free Tier
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).
Databases
Read and confirmed 2026-10-30
Spark
Spark plan, no payment method needed: Auth (50K MAU), Firestore Standard edition (1 GiB stored, 50K reads/day, 20K writes/day, 20K deletes/day), Realtime Database (100 simultaneous connections, 1 GB stored, 10 GB/month downloaded), Hosting (10 GB storage, 360 MB/day transfer), and no-cost…
Databases
Read 2026-10-26 · confirmed 2026-10-03
Free
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.
Databases
Read 2026-10-30 · confirmed 2026-09-13
Free
Managed Milvus vector database — free tier: 5 GB storage, 2.5M vector compute units/month, up to 5 collections. Milvus open-source also free to self-host with no limits
Databases
Read and confirmed 2026-11-07
Free
Vectorize is Cloudflare's vector database for Workers. Workers Free includes 30 million queried vector dimensions per month and 5 million stored vector dimensions (about 6,500 vectors of 768 dimensions, or about 3,250 vectors of 1,536 dimensions).
Databases
Read 2026-11-03
Free
Serverless vector database by Upstash. Free: 200M vectors × dimensions (about 130,000 vectors at the maximum 1,536 dimensions), 100 namespaces, 10K queries and updates a day, 1 GB of data
Databases
Read and confirmed 2026-10-28
Open Source
Open-source vector database — self-hosted free. Cloud: permanent free tier with 1 cluster, 100,000 objects, 1 GB memory, 10 GB disk, 1 collection, up to 3 tenants, 2,000 embedding requests/day and 1,000 Query Agent requests/month.
Databases
Read and confirmed 2026-10-26
Free
Serverless Redis — 500K commands/month (250MB data). Vector: 200M vectors × dimensions and 10K queries a day free.
Databases
Read 2026-10-28 · confirmed 2026-10-04
Free
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.
Databases
Read and confirmed 2026-10-29
Free
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…
Databases
Read and confirmed 2026-10-28
Free
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.
Databases
Read and confirmed 2026-10-30
Free
a fast and straightforward NoSQL cloud database service. With restdb.io you get schema, relations, automatic REST API (with MongoDB-like queries), and an efficient multi-user admin UI for working with data.
Databases
Read and confirmed 2026-11-03
M0 Free
Free 512 MB shared cluster (M0), always free, available on AWS/Azure/GCP. Includes Atlas Vector Search for AI/RAG applications
- Atlas automatically pauses Free (M0) clusters after 30 days of inactivity where there are zero connections to the cluster. (From mongodb.com/docs/atlas/reference/free-shared-limitations, read 2026-10-18.)
- A Free cluster allows at most 500 connections and 100 read and write operations per second; operations over that limit are queued. (From mongodb.com/docs/atlas/reference/free-shared-limitations, read 2026-10-18.)
- MongoDB Atlas's free M0 cluster needs no credit card. (From mongodb.com/resources/basics/databases/cloud-databases/free-cloud-database, read 2026-10-22.)
- An agent can create a MongoDB Atlas M0 cluster via the API without an account. A person must sign in to claim the cluster, which then becomes a standard Free cluster with no expiration. Unclaimed clusters pause after 2 days and delete after 7. (From mongodb.com/docs/atlas/tutorial/create-ephemeral-cluster, read 2026-10-22.)
- The Flex tier has a monthly base price of $8.00, which includes 5GB storage, 100 operations per second and unlimited data transfer. More operations per second cost extra by tier, and Flex clusters are capped at $30 per month. (From mongodb.com/docs/atlas/billing/atlas-flex-costs, read 2026-10-29.)
- Flex clusters limit total data storage to 5 GB and the number of read and write operations to 500 operations per second. (From mongodb.com/docs/atlas/reference/flex-limitations, read 2026-10-29.)
- Upgrading a Free cluster asks for payment information and starts billing. Changing from a Free cluster to a Flex cluster requires downtime. (From mongodb.com/docs/atlas/scale-cluster, read 2026-10-29.)
Databases
Read and confirmed 2026-11-06
Free
Open-source Postgres platform (Apache 2.0) with copy-on-write branching and scale-to-zero. Self-hosted on Kubernetes — free forever.
Databases
Read and confirmed 2026-11-02
Free (CRFREE)
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.
Databases
Read and confirmed 2026-11-12
Free
Postgres for multi-tenant apps — 1 GB storage, 50M serverless query tokens, 500 max connections. Unlimited databases and tenant DBs.
Databases
Read and confirmed 2026-11-05
Free
deploy a forever free tier fully managed database cluster with 1 node and 8GB storage, built for developers to create the next generation of applications across IoT to AI
Databases
Read 2026-10-12 · catalogue date 2026-07-15
−1 stale_verification Our last read of the vendor's pricing page, on 2026-10-12, could read no amount, tier or rate on the page. This is our confidence in the record, not a change by the vendor.
Free
Graph database cloud service — free tier: single database, up to 200,000 nodes and 400,000 relationships. Full Cypher query language support.
Databases
Read 2026-10-31 · catalogue date 2026-08-15
−1 stale_verification Our last read of the vendor's pricing page, on 2026-10-31, found the page different from the terms we hold. This is our confidence in the record, not a change by the vendor.
Trial
Distributed SQL database. No free plan for new deployments since 2026-09-15, when CockroachDB moved new clusters to Cockroach Continuum pricing.
Databases
Read 2026-10-24 · confirmed 2026-09-02
−3 free_tier_withdrawn Recorded free tier removal on 2026-09-15: CockroachDB stopped offering its free Basic plan (50 million RUs and 10 GiB of storage free per month) to new deployments on 2026-09-15, when it moved new clusters to Cockroach Continuum pricing. New Cloud organizations now get a 30-day free trial with $400 in credit. Clusters created before 2026-09-15 stay on their existing plans during their current term. Source: https://www.cockroachlabs.com/cockroachdb/pricing/
−2 time_limited_offer Tier "Trial" is a trial that expires, not an ongoing free tier.
Pay-as-you-go
Serverless vector database. No free tier: every plan has a monthly minimum, $16 on Launch and $256 on Scale, and usage above the minimum is billed.
Databases
Read 2026-10-25 · catalogue date 2026-08-19
not_a_free_offer Tier "Pay-as-you-go" is usage-billed from the first request.