HarperDB Alternatives (September 2025)

Small, fast, reliable database management system Persistent and/or in-memory data storage for edge-cloud, powerful for professional developers

Manage all types of time series data in a single, purpose-built database. Optimized for speed in any environment in the cloud, on-premises, or at the edge.

Aerospike provides organizations with a real-time, multi-model database that fits their needs to scale, manage cloud services, and reduce cost.

The Oracle Berkeley DB family of open source, embeddable databases provides developers with fast, reliable, local persistence with zero administration. Often deployed as an 'edge' database, Oracle Berkeley DB provides very high performance, reliability, scalability, and availability for application use cases that do not require SQL

ScyllaDB is the distributed database for data-intensive apps that require high performance and low latency.

QuestDB is the world's fastest growing open-source time-series database. It offers massive ingestion throughput, millisecond queries, powerful time-series SQL extensions, and scales well with minimal and maximal hardware. Save costs with better performance and efficiency.

Build blazing fast search and AI applications in record time.

Real-time analytics database for instant aggregations and hybrid search. No more need for complex indexing strategies, everything is indexed automatically. Execute ad-hoc queries, perform hybrid search effortlessly, and boost developer productivity with native SQL.

MongoDB Atlas is the only multi-cloud developer data platform that accelerates and simplifies how you build with data. Get started for free today!

ArangoDB is the leading multi-model database for high-performance applications. Try it now for flexible data modeling and efficient querying.

Get your ideas to market faster with a developer data platform built on the leading modern database. MongoDB makes working with data easy.

NoSQL Database can be run in the cloud or on-premises for applications that require either flexible data models, workloads, demanding predictable, lighting fast access to data or easy to use APIs.

Build apps at lightning speed with a visual low-code app builder featuring UI, Codeless logic, real-time database, messaging, and more.

Aiven simplifies cloud data infrastructure management by deploying open-source technologies across multiple clouds, enabling fast and confident creation of next-generation applications.

Developers love Redis. Unlock the full potential of the Redis database with Redis Enterprise and start building blazing fast apps.

GigaSpaces modernizes enterprise architectures to drive digital transformation with unparalleled speed, performance and scale.

Aiven simplifies cloud data infrastructure management by deploying open-source technologies across multiple clouds, enabling fast and confident creation of next-generation applications.

Cloudera Operational Database is a cloud-native service that speeds up, automates, and simplifies the development and deployment of mission-critical applications.

InterSystems IRIS is a database management system (DBMS) that makes it easier to build machine learning-enabled applications that connect data and application silos.

BangDB is an AI database platform with Graph and time-series data analysis. It is designed for modern use cases for edge computing

TapData is a real-time data integration and data as a service platform that provides seamless connectivity with over 100+ databases, MongoDB,SaaS, and file systems.

Designed for applications, analytics and AI, SingleStore is the world's only real-time data platform to read, write and reason on petabyte-scale data in a few milliseconds.

Explore the world's fastest database and analytics platform. Data-driven organizations choose KX for faster, more confident decision making.

Couchbase is the NoSQL cloud database platform for business-critical and AI-powered applications. Uncompromised speed, versatility, affordability, and ease of use for building modern, AI-powered applications. ✓ Learn more.

Our NoSQL Object Database manages data without the need for mapping code to store & retrieve objects in Java & C++ applications.

MariaDB provides enterprise open source database and cloud managed database services to support scalability, mission-critical deployments, and more.

The only open source, AI-ready graph database that gives developers the tools to quickly build distributed applications at scale.

Take instant action on your streaming data by combining stream processing and an ultra-fast data store in one unified platform. Get started!

Solve your most complex data challenges and unlock more value with the MarkLogic data platform.

NCache is an extremely fast and scalable Open Source In-Memory Distributed Cache for .NET and Java that caches app data and stores Web Sessions in multi-server environments.

ScaleGrid makes it easy to deploy database hosting for MySQL™, PostgreSQL®, Redis®, MongoDB®, and, Greenplum Database® on every major cloud. Try it for free!

Fauna combines the relational power, strong consistency, and schema capabilities of a relational database with the flexibility and scalability of documents, all delivered as a Cloud API with zero engineering operations.

High-speed & lightweight database solution which securly stores your data privatly on-device and syncs it seamless to millions of devices

The self-managed version of Hazelcast Platform allows you to deploy Hazelcast within your preferred environment. Get started instantly!

Redpanda is a powerful, simple, and cost-efficient streaming data platform that is compatible with Kafka® APIs while eliminating Kafka complexity.

VelocityDB is an easy to use, extremely high performance, scalable, embeddable and distributable object database system with indexes for C# .NET applications with a small footprint (~ 600KB).

An in-memory, distributed, NoSQL datastore solution that lets your applications access, process, and analyze data.

Materialize's Cloud Operational Data Store offers real-time data insights for effective business operations & decision-making.

Experience the fastest path to graph with Neo4j. The most trusted, native graph database offers no compromise performance, reliability, and data integrity.

Appwrite is an open-source platform for building applications at any scale, using your preferred programming languages and tools.

Develop enterprise applications faster with Visual LANSA, the leading low-code platform for building powerful, scalable solutions.

Discover the TIBCO® Platform––Messaging for seamless, real-time data distribution across your enterprise. Our platform offers diverse messaging components like TIBCO Enterprise Message Service™, TIBCO® Messaging Quasar, and more, ensuring high-performance, secure, and reliable data exchange for complex IT environments. Explore our solutions tailored for cloud integration, IoT, and event-driven architectures

Harness AI with Oracle Database 23ai to power app development and critical workloads, enhancing your data operations for free.

AppDrag is a serverless development platform made for enterprises. Produce 100% custom applications 10X faster, world class level performances and high availability, 24/7 professional support. Join hundreds of enterprises building the future with us in the cloud.

Firebolt is a complete redesign of the cloud data warehouse for the era of cloud and data lakes. Data warehousing with extreme speed & elasticity at scale.

The Unified Data Lakehouse Platform for Self-Service Analytics and AI. Dremio provides the fastest SQL engine with the best price-performance for Apache Iceberg

Simplify database design and exchange data seamlessly in distributed systems.

memcached

Build production-grade applications with a Postgres database, Authentication, instant APIs, Realtime, Functions, Storage and Vector embeddings. Start for free.

Platform teams use Rafay’s PaaS to help developers and data scientists deploy CPU-based and GPU-based workloads in data centers, public clouds, or at the edge.

Exasol is leading the way in data technology with our in-memory database built for analytics. Learn how your data team can do more with Exasol.

FHIR-based Healthcare Application Development. Advanced Interoperability. Unprecedented Speed. Massive Scale.

Quest Software Foglight For Cross Platform Databases

Rapidly design and deploy embedded database applications that run remotely on servers, laptops, handhelds, and smartphones with SAP SQL Anywhere relational database management system (RDBMS) solutions.

RocksDB is an embeddable persistent key-value store for fast storage.

Toshiba GridDBâ„¢ is a highly scalable, in-memory NoSQL time series database optimized for IoT and Big Data.

Go from app idea to production with 20% higher relevance and 74x faster response on the industry-leading vector database, Astra DB. Get started for free!

Retool is the fastest way to build internal software. Use Retool's building blocks to build apps and workflow automations that connect to your databases and APIs, instantly.

Vendia's data automation platform delivers trusted business insights and complete data oversight, empowering you to integrate any system, anywhere.

MonetDB - MonetDB

Heroku is a platform as a service (PaaS) that enables developers to build, run, and operate applications entirely in the cloud.

Heroku is a platform as a service (PaaS) that enables developers to build, run, and operate applications entirely in the cloud.

Engineered to handle demanding workloads, like time series, vector, events, and analytics data. Built on PostgreSQL, with expert support at no extra charge.

SashiDo.io is a serverless API development platform with scalable json rest and graphql apis, headless cms, built with nodejs, mongodb, parse server, kubernetes and docker.

Store, manage, and simplify all your unstructured data and hybrid workflows in one platform, anywhere - at the edge, in the core, or in any cloud.

An open source Java EE 8-compliant application server that lets you build Java applications once and deploy them everywhere.

Bandwidth is an enterprise communications platform with voice, messaging, and emergency APIs for your communications stack.

Integrate in minutes and send transactional emails via our REST API or SMTP. Scale with our reliable global infrastructure and deliver emails to your customer's inbox instantly.

Knack makes it easy to build custom online databases without coding. Simple, powerful, backed by world class support. Build your own custom database today!

High Performance Database

Securing Every Machine and Digital Transaction with a Trusted Identity

Makers of NServiceBus, the most developer-friendly distributed systems platform for .NET…

Transform your business with the leading real-time analytics solution, trusted at scale, from the creators of Apache Pinot.

An ocean of simple, scalable cloud solutions.

With Ninox (SaaS), build business apps and databases as you want, including for CRM and ERP, without a single line of code (no-code/low-code).

IBM Informix is an embeddable, high-performance database for integrating SQL, NoSQL, JSON, time-series and spatial data. It is available as a managed service on IBM Cloud, as standalone software, and within IBM Cloud Pak for Data.

Hyperledger Foundation is the open source, global ecosystem for enterprise-grade blockchain technologies at the core of critical developments globally.

Develop and deploy highscale AI-powered mobile and IoT apps with fully managed backend services.

Airtable is a low‒code platform to build next‒gen apps. Move beyond rigid tools, operationalize your critical data, and reimagine workflows with AI.

Edgio develops and delivers online experiences faster, safer, and with more control. Put your online business on the leading edge with Edgio!

Simplify and accelerate your IT with HPE SimpliVity Hyperconverged, an intelligent, hyper-efficient HCI solution for edge, VDI, and general virtualization workloads.

SDO Helpline

Build invincible apps with Temporal's open-source durable execution platform to guarantee successful execution, even in the presence of failures.

The Warp 10 platform is built to simplify managing and processing Time Series data. It includes a Geo Time Series database and a companion analytics engine.

Load, distribute, and filter transactions within your enterprise in real-time and enable migrations between different databases with zero-downtime. Replicate data up to 6X faster than traditional data movement solutions.

StreamSets data integration platform is a single interface for creating, reusing and sharing data pipelines to unlock your data without ceding control.

Aiven for PostgreSQL – Managed Postgres database service with Postgres extensions, database forking, connection pooling.

Render is a unified cloud to build and run all your apps and websites with free TLS certificates, global CDN, private networks and auto deploys from Git.

Power your real-time app with PubNub—the world's largest pub/sub network. Scale to 3 trillion API calls/month, with <30ms global delivery. Start building now!

Create a REST API from any database. Hook up any SQL or NoSQL database and the CData API Server instantly generates flexible, comprehensive, & fully documented APIs.

Our Enterprise VDI platform delivers virtual desktops and apps across multiple clouds and on-prem data centers with industry-leading reliability.

Qdrant is an Open-Source Vector Database and Vector Search Engine written in Rust. It provides fast and scalable vector similarity search service with convenient API.

Zuplo is the API management platform for developers. Build, deploy, and scale APIs faster with Zuplo.

IBM Db2 is the database to run your mission-critical workloads. Power low-latency transactions and real-time analytics across any cloud, hybrid or on-prem.

Accelerate your eCommerce data and analytics journey with Saras Analytics. With our cloud data pipeline (Daton) and on-demand consulting services, get a 360° view of your customers!

Rapidly create and deploy models for complex applications with VMware Tanzu Greenplum. Learn more about how to scale your enterprise analytics here.

Adverity is the fully-integrated data platform for businesses to easily automate the connectivity, transformation, and governance of data at scale.

Realtime distributed OLAP datastore

A powerful CMS, BaaS, and more. Power any project with Directus – a composable data platform to easily create and deploy data-rich apps.