Chroma vs sizeless: Features, Pricing & Which Is Better (2026)
A side-by-side comparison of Chroma and sizeless — features, pricing, and ideal use cases — to help you decide which AI tool fits your workflow.
Chroma
Chroma
Open-source vector search and retrieval database for building semantic search and retrieval-augmented AI applications.
Key features
- Vector Similarity Search: Fast nearest-neighbor retrieval over embeddings using configurable similarity metrics and HNSW parameters to return semantically relevant results for queries.
- Full-Text and Hybrid Retrieval: Support for full-text search and hybrid workflows (e.g., combining BM25 and vector retrieval) to improve relevance for retrieval-augmented generation and search applications.
- Flexible Storage Backends: Multiple client/storage modes including Ephemeral (in-memory) for testing, Persistent (file-based) for local storage, HTTP client for self-hosted server access, and Cloud client for managed Chroma Cloud integration.
- Collection Management: Create and manage named collections of documents and embeddings with metadata, enabling structured organization, per-collection settings, and scoped retrieval for applications.
- Metadata Filtering and Faceted Retrieval: Filter and refine retrieval results based on stored metadata fields to implement context-aware and multi-tenant retrieval scenarios.
- MCP Server Support: Provides a Model Context Protocol (MCP) server implementation to host Chroma as a service for remote clients, enabling API-key based access and integration with package-search and other MCP consumers.
- Cloud Integration & API Access: Cloud client automatically connects to api.trychroma.com, supports API key headers (e.g., x-chroma-token), and includes tooling to copy data to the cloud and configure remote MCP endpoints.
- Developer Tooling & Multi-language Clients: Official and community clients and examples for Python/JS and other languages, plus guidance for running Chroma in Docker and troubleshooting client/server version mismatches.
- Vector search using configurable HNSW parameters
- Full text search (including BM25 hybrid examples)
- Metadata filtering and collection management
- Flexible client types: Ephemeral (in-memory), Persistent (file-based), HTTP client, Cloud client
- MCP server implementation for self-hosting (chroma-mcp)
- Chroma Cloud integration (connects to api.trychroma.com via SSL)
- API key authentication via x-chroma-token or Authorization header
- Language client ecosystem (Python native client, Ruby gem, community C++ examples over HTTP)
- Docker deployment support and configuration options
- Support for retrieval-augmented generation (RAG) and hybrid retrieval workflows
Best for
- Retrieval-Augmented Generation (RAG): Store LLM-generated embeddings and documents in collections, then retrieve top-k semantically relevant passages to include as context for LLM prompts.
- Semantic Document Search: Power search interfaces for knowledge bases, help centers, or internal docs using vector similarity and metadata filters to return relevant documents by intent rather than keyword match.
- Hybrid Search Pipelines: Combine BM25 full-text retrievers with Chroma vector retrieval to surface both keyword- and semantic-relevant results in QA or assistant applications.
- Self-hosted Vector DB for Apps: Run Chroma locally or in private infrastructure (persistent or ephemeral) to keep embeddings and user data on-premises while enabling fast retrieval for production services.
- Managed Cloud Deployment: Use Chroma Cloud (api.trychroma.com) for a hosted database with API-key access for teams that prefer a managed service and multi-tenant access via MCP.
- Package and Code Search: Provide package-search or codebase retrieval by indexing artifacts and exposing a remote MCP server for search across registries and repos.
- Model Context Serving: Deploy an MCP server to supply contextual collections to models in production, enabling models to create, update, and retrieve context windows dynamically.
- Store and retrieve embeddings for retrieval-augmented generation (RAG) systems
- Semantic search over document collections with vector + BM25 hybrid methods
- Knowledge base and conversational agent memory storage
- Package/content search via remote MCP servers
- Rapid prototyping with ephemeral in-memory collections and production with file-based persistence or Chroma Cloud
sizeless
sizeless
Turns a smartphone video of an open trench into a centimetre-accurate 3D point cloud, CAD as-built plan and GIS-ready digital twin of buried utilities.
Key features
- Smartphone capture: Field crews record an open trench with a standard iPhone Pro — no specialist scanning hardware and no separate surveying appointment
- Centimetre-accurate point clouds: Reconstruction algorithms developed at ETH Zurich build a high-resolution 3D point cloud of the excavation from the video alone
- Standards-compliant CAD output: Generates as-built plans in DWG and DXF, with couplings and pipe runs identified and measurements simplified
- 3D digital twin and GIS export: Produces a model of the pipe route including building entries that drops into existing GIS systems
- Works without GPS: Captures basement sections and building entry points where GNSS-based surveying fails
- Immediate backfilling: Because capture takes minutes, trenches close right after filming instead of waiting on a survey crew
- Documentation in about 72 hours: Complete records arrive weeks earlier than conventional surveying, enabling prompt connection billing
- Third-party utility capture: Records crossing utilities and as-laid geometry as unbroken 3D evidence, replacing hand sketches
Best for
- A utility network operator documenting residential service connections without booking a surveyor for every site
- A contractor closing a trench the same day instead of leaving it open pending a survey appointment
- Capturing a building entry point in a basement where GPS-based surveying cannot get a fix
- A district heating project producing as-built DWG plans for regulatory sign-off
- Spotting a laying error in the 3D point cloud before backfilling, while the fix is still cheap
- Feeding as-built pipe geometry into a GIS system for long-term network maintenance planning