local-first vector embedding and storage
Stores document embeddings and vector data directly on the client device using WebAssembly-based indexing, eliminating the need for cloud vector database infrastructure. Implements in-process vector storage with support for semantic search without external API calls, using a hybrid approach that combines dense vector indices with document metadata storage in a single local database instance.
Unique: Implements vector indexing entirely in WebAssembly with no external dependencies, enabling true offline vector search in browsers and React Native apps — most competitors require cloud backends or Node.js-only solutions
vs alternatives: Provides local vector search without Pinecone/Weaviate infrastructure costs or network latency, while maintaining compatibility with React Native unlike browser-only alternatives like Milvus.js
hybrid document-vector search with semantic ranking
Combines traditional full-text document search with vector similarity matching, using a two-stage ranking pipeline that first filters by keyword relevance then re-ranks by semantic similarity. Implements hybrid search by maintaining parallel indices — a text inverted index for keyword matching and a vector index for semantic queries — with configurable weighting between both signals.
Unique: Implements dual-index hybrid search (text + vector) entirely client-side with configurable fusion strategies, whereas most local search libraries support only one modality or require separate infrastructure for each
vs alternatives: Eliminates the need for separate Elasticsearch and vector database by unifying both search types in a single local index, reducing complexity and infrastructure costs compared to hybrid search stacks
typescript type-safe query builder with compile-time validation
Provides a fluent TypeScript query builder API with full type inference for document schemas, catching query errors at compile time rather than runtime. Implements generic type parameters to ensure filter predicates, sort fields, and projections match the document schema, with IDE autocomplete for all query operations.
Unique: Implements compile-time schema validation for database queries using TypeScript generics, whereas most query builders (including Prisma for local databases) rely on runtime validation or code generation
vs alternatives: Provides type safety without code generation overhead, catching schema mismatches immediately in the IDE rather than at runtime or build time
incremental vector index updates with delta synchronization
Supports adding, updating, and removing documents from the vector index without full re-indexing, using delta tracking to identify changed documents and update only affected index entries. Implements incremental index maintenance with optional background compaction to reclaim space from deleted documents.
Unique: Implements incremental vector index updates with delta tracking, whereas most vector databases require full re-indexing or provide no incremental update mechanism
vs alternatives: Reduces indexing latency for document updates by orders of magnitude compared to full re-indexing, while maintaining index consistency without external coordination
configurable embedding model integration with provider abstraction
Provides an abstraction layer for embedding models that supports multiple providers (OpenAI, Hugging Face, local ONNX models) with a unified API, allowing applications to switch embedding providers without changing database code. Implements caching of computed embeddings to avoid redundant API calls and supports batch embedding requests for efficiency.
Unique: Abstracts embedding model selection with a unified API supporting cloud and local models, whereas most databases hardcode a single embedding provider
vs alternatives: Enables switching between OpenAI, Hugging Face, and local ONNX embeddings without code changes, compared to databases that lock you into a single provider
cross-platform persistence with automatic schema migration
Provides unified storage API that abstracts over browser IndexedDB, React Native AsyncStorage, and Node.js file system, with automatic schema versioning and migration support. Implements a storage adapter pattern that detects the runtime environment and selects the appropriate backend, while maintaining a consistent query interface across all platforms and handling schema evolution through versioned migrations.
Unique: Single unified storage API with automatic platform detection and built-in schema migration, whereas competitors like WatermelonDB or Realm require platform-specific code or separate migration tooling
vs alternatives: Reduces boilerplate for isomorphic apps by eliminating platform-specific storage adapters, while providing schema versioning that most lightweight local databases (like PouchDB) lack
real-time document synchronization with conflict resolution
Implements operational transformation or CRDT-based synchronization to keep local document state in sync across multiple clients and tabs, with automatic conflict resolution using configurable merge strategies. Detects concurrent edits, applies transformations to maintain consistency, and provides hooks for custom conflict resolution logic when automatic merging fails.
Unique: Implements client-side conflict resolution with pluggable merge strategies, allowing applications to define domain-specific conflict handling without server involvement — most local databases lack built-in sync primitives
vs alternatives: Provides offline-first synchronization without requiring Firebase or similar backend services, while offering more control over conflict resolution than CRDTs-as-a-service platforms
semantic document filtering with embedding-based queries
Enables filtering and querying documents based on semantic similarity to a query embedding, supporting range queries on vector distance and multi-field filtering combined with vector similarity. Implements vector distance calculations (cosine, euclidean) with optional metadata filtering, allowing developers to find documents semantically similar to a query without full-text matching.
Unique: Combines vector similarity queries with metadata filtering in a single query interface, whereas most vector databases require separate API calls for filtering and similarity search
vs alternatives: Provides local semantic search without Pinecone or Weaviate, with simpler query syntax than SQL-based vector databases at the cost of brute-force performance
+5 more capabilities