Best Free Vector Databases

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. Paid cloud from $45/mo (Flex)

• A free Weaviate Cloud cluster is suspended after 7 days of inactivity, with its data kept, until you reactivate it. (From docs.weaviate.io/cloud/manage-clusters/create, read 2026-10-07.)
• A free cluster that stays inactive is permanently deleted after 30 days of total inactivity. (From docs.weaviate.io/cloud/manage-clusters/create, read 2026-10-07.)

Listed in Databases, and on this page because we labelled it vector. We read that on 2026-08-31 from https://weaviate.io/pricing, where it says: “Compare pricing options for our different levels of vector database services and solutions.”. 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 vector. 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

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

Listed in Databases, and on this page because we labelled it vector. We read that on 2026-08-31 from https://upstash.com/, where it says: “Serverless Redis, Vector and Search databases with low latency and pay-as-you-go pricing.”. How we use this

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. Until then, Chroma Cloud's Starter plan is $0 a month plus usage, with $5 in free credits. Write per GiB written $2.50, Storage per GiB per month $0.33, Query per TiB queried $0.0075, Network per GiB returned $0.09. Starter plan includes 10 databases and 10 team members.

• On Chroma Cloud, reaching a usage limit, whether yours or Chroma's, pauses the service until the limit is changed. (From trychroma.com/pricing, read 2026-10-07.)
• Chroma Cloud is winding down: it becomes read-only on December 7, 2026, and stops serving reads on December 22, 2026, so data must be exported before then. Open-source ChromaDB stays available under the Apache 2.0 license. (From trychroma.com/cloud-wind-down, read 2026-11-12.)

Listed in Databases, and on this page because we labelled it vector. We read that on 2026-08-31 from https://www.trychroma.com/, where it says: “Fast, serverless, and scalable infrastructure supporting vector, full-text, regex, and metadata search.”. How we use this

Serverless Redis — 500K commands/month (250MB data). Vector: 200M vectors × dimensions and 10K queries a day free. QStash: 1,000 messages/day free

• Free Redis databases unused for at least 30 days are archived after warning emails. Their data is backed up and can be restored into a new database from the console. (From upstash.com/docs/redis/help/faq, read 2026-10-06.)
• Adding the first payment method moves every free resource on the account to its paid plan: all Redis databases, plus QStash, Vector, Search and Blob. An account with a payment method cannot have free databases. (From upstash.com/docs/redis/overall/billing, read 2026-10-29.)
• Paid databases do not get the Free plan's data and command allowance. (From upstash.com/pricing/redis, read 2026-10-29.)
• Pay as You Go costs $0.20 per 100K commands. Storage past each database's first 1 GB is $0.25 per GB. Bandwidth past 200 GB a month is $0.03 per GB. (From upstash.com/pricing/redis, read 2026-10-29.)
• A Pay as You Go database can have a monthly budget. When the budget is reached the database is rate-limited rather than continuing to bill. Budgets are set per database; there is no account-wide budget. (From upstash.com/docs/redis/overall/billing, read 2026-10-29.)
• A free Upstash Redis database returns "ReplyError: ERR max requests limit exceeded" once it passes the monthly command limit. (From upstash.com/docs/redis/troubleshooting/max_requests_limit, read 2026-10-29.)
• An agent can create an Upstash Redis database with no signup, card or API key by a POST request to upstash.com/start-redis. It is deleted after 3 days unless a person claims it from the console link in the response. (From upstash.com/pricing, read 2026-10-22.)

Listed in Databases, and on this page because we labelled it vector. We read that on 2026-08-31 from https://upstash.com/, where it says: “Serverless Redis, Vector and Search databases with low latency and pay-as-you-go pricing.”. 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 vector. 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

Vector database. The Qdrant Cloud Free Tier is a single-node cluster with 0.5 vCPU, 1 GB RAM and 4 GB disk, for testing and prototypes, with no credit card required; Qdrant says it serves about 1M vectors of 768 dimensions. It includes free Cloud Inference with selected models. An unused free cluster is suspended after 1 week and deleted after 4 weeks of inactivity if not reactivated. Paid clusters are billed on CPU, memory and disk usage.

• An unused Free Tier cluster is suspended after 1 week and deleted after 4 weeks of inactivity unless you reactivate it. (From qdrant.tech/documentation/cloud/create-cluster, read 2026-10-07.)

Listed in AI / ML, and on this page because we labelled it vector_store. We read that on 2026-09-01 from https://qdrant.tech/pricing/, where it says: “Scale to production with fully managed vector search”. How we use this

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). It allows 100 indexes. Workers Paid includes 50 million queried dimensions per month and 10 million stored dimensions. Overage is $0.01 per million queried dimensions and $0.05 per 100 million stored dimensions. CPU, memory and active index hours are not billed. Each vector can have up to 1536 dimensions. Each index can hold up to 20 million vectors.

• Cloudflare counts queried vector dimensions as stored vectors plus queries, multiplied by dimensions. For example, 10,000 vectors with 384 dimensions and 100 queries gives (10,000 + 100) × 384 = 3.878 million queried vector dimensions. (From developers.cloudflare.com/vectorize/platform/pricing, read 2026-11-03.)
• Cloudflare says the Workers Free plan will always include Vectorize for prototyping and experimenting. (From developers.cloudflare.com/vectorize/platform/pricing, read 2026-11-03.)
• Cloudflare Vectorize's free plan needs no credit card. (From cloudflare.com/developer-platform/products/vectorize, read 2026-11-03.)
• Vectorize usage past the Free allowances 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 2026-11-03.)

Listed in Databases, and on this page because we labelled it vector. We read that on 2026-11-03 from https://developers.cloudflare.com/vectorize/, where it says: “Vectorize is a globally distributed vector database that enables you to build full-stack, AI-powered applications with Cloudflare Workers.”. How we use this

Vector database. The Starter plan is free: up to 2 GB storage, 2M write units and 1M read units a month, 1 GB of egress a month (reads that return data stop at the cap until the next billing period), 5 indexes, 1 project and 2 users, on AWS us-east-1 only. Assistant includes 1 GB storage and 500k input, 300k output and 500k context tokens a month. Three embedding models include 5M tokens a month each; bge-reranker-v2-m3 includes 500 requests a month. Builder is $20/month flat.

Listed in AI / ML, and on this page because we labelled it vector_store. We read that on 2026-09-01 from https://www.pinecone.io/, where it says: “Pinecone is a fully managed vector database built for AI. Writes are instantly searchable, indexing is automatic, and queries stay fast at any scale.”. How we use this

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

Listed in Databases, and on this page because we labelled it vector. We read that on 2026-08-31 from https://zilliz.com/, where it says: “Zilliz offers a fully managed Vector Lakebase powered by Milvus, unifying real-time vector search, lake-scale discovery, and AI data operations.”. How we use this