Tkrzw

At a glance

• Editor score
  Not yet scored
• Pricing
  Open source
• Best for
  C++ key-value systems needing bindings
• Paid from
  None
• Data synchronization
  Yes
• Facts checked
  20 Sep 2026

• Where it wins

  • Multiple hash-table, B+ tree, skip-list, cache, and memory databases
  • Thread-safe access, asynchronous adapter, secondary indexes, and replication adapters
  • Python, Ruby, Java, and Go bindings complement the C++ library

• Where it doesn't

  • The interface is API-based key-value access rather than a SQL query layer
  • Its primary implementation is a C++ library, with bindings for other languages
  • It is a local library, not a hosted database service with subscription tiers

Our verdict on Tkrzw

Tkrzw is an open-source, embeddable C++ library for storing associative key-value records in persistent files or memory. It is aimed at developers adding local storage, indexing, caching, or other database-backed functionality directly to applications. The library presents hash-table, B+ tree, skip-list, cache, and standard-container implementations through a common DBM interface, with common Set, Get, Remove, and iterator operations. Python, Ruby, Java, and Go bindings extend its reach beyond C++ projects.

Its main strength is structural choice within a focused key-value model. Developers can select hash-table file databases, B+ tree file databases, skip-list file databases, in-memory implementations, or other listed database forms while retaining the common DBM interface. Thread-safe concurrent access supports multi-threaded applications, and the asynchronous database adapter addresses workflows that should not depend on purely synchronous access. Secondary indexes add another option for lookup design, while AES and RC4 encryption compressors, database update logging, and replication adapters cover additional storage and synchronization needs.

Tkrzw also fits projects that need an embeddable component rather than a separate database service. The published project details describe a C++ library distributed as open source, with language bindings and documentation for several languages. That makes it a practical candidate for application-local persistence and custom storage layers, especially when direct API access and multiple file-database structures matter. It is less suitable for teams seeking a hosted subscription product or a SQL-oriented interface, since its stated model is key-value and its query interface is an API. Choose Tkrzw for embedded, adaptable DBM storage; consider an alternative when managed hosting or relational querying is central.

Tkrzw pricing

Tkrzw fact sheet

Alternatives to Tkrzw

• SQLiteA capable, zero-configuration SQL engine for applications that need local embedded storage.—
• HDH2 Database EngineA flexible embedded SQL engine for Java applications, with self-hosted server options.—
• FirebirdA self-hosted SQL database with replication, backups, and multiple deployment architectures.—

See all Tkrzw alternatives →

Featured on iTechGuides

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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

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