Best Free Data Modeling Tools

Compare the Top Free Data Modeling Tools as of May 2025

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What are Free Data Modeling Tools?

Data modeling tools are software tools that help organizations design, visualize, and manage data structures, relationships, and flows within databases and data systems. These tools enable data architects and engineers to create conceptual, logical, and physical data models that ensure data is organized in a way that is efficient, scalable, and aligned with business needs. Data modeling tools also provide features for defining data attributes, establishing relationships between entities, and ensuring data integrity through constraints. By automating aspects of the design and validation process, these tools help prevent errors and inconsistencies in database structures. They are essential for businesses that need to manage complex datasets and maintain data consistency across multiple platforms. Compare and read user reviews of the best Free Data Modeling tools currently available using the table below. This list is updated regularly.

1

Kubit

Kubit

Your data, your insights—no third-party ownership or black-box analytics. Kubit is the leading Customer Journey Analytics platform for enterprises, enabling self-service insights, rapid decisions, and full transparency—without engineering dependencies or vendor lock-in. Unlike traditional tools, Kubit eliminates data silos, letting teams analyze customer behavior directly from Snowflake, BigQuery, or Databricks—no ETL or forced extraction needed. With built-in funnel, path, retention, and cohort analysis, Kubit empowers product teams with fast, exploratory analytics to detect anomalies, surface trends, and drive engagement—without compromise. Enterprises like Paramount, TelevisaUnivision, and Miro trust Kubit for its agility, reliability, and customer-first approach. Learn more at kubit.ai.

29 Ratings

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2

Lucidchart

Lucid Software

Lucidchart is an advanced diagramming tool designed to help businesses and teams optimize their processes, systems, and workflows with intelligent, data-driven diagrams. The platform combines powerful AI features, such as AI-generated diagrams, data linking, and real-time collaboration, to make visualizing complex systems and architectures faster and more efficient. Lucidchart supports multiple use cases, including process maps, flowcharts, technical diagrams, organizational charts, and systems planning. Its seamless integrations with popular apps like Jira, Confluence, Slack, and Teams allow for enhanced collaboration, enabling teams to align on priorities and act on insights quickly. Lucidchart is the perfect tool for anyone looking to create professional diagrams in less time, while fostering better decision-making and innovation.

8,889 Ratings

Starting Price: $7.95/month/user

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3

KS DB Merge Tools

KS DB Merge Tools

KS DB Merge Tools is an easy to use diff & merge tool for MySQL, MariaDB, Oracle Database, SQL Server, PostgreSQL, SQLite, MS Access and Cross-DBMS databases allowing to compare and sync both schema and data. Starting with a schema changes summary, results can be narrowed down to object lists of particular object type (table definitions, views, etc.), and then down to definition of particular object. Data changes can be retrieved as a high-level list of changes totals across all tables in the database, each total row count can be observed as a side-by-side list of rows for the given table, each changed row can be analyzed for changes in each column. Various diff results provide quick filters to show only new/changed/new+changed items (schema objects or table data rows), ability to select required changed items and generate scripts to apply these changes to the other side database. This script can be executed immediately or saved for future use.

5 Ratings

Starting Price: $65

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4

FactoryStudio

Tatsoft

Tatsoft’s FactoryStudio gives you the tools to rapidly design powerful and secure industrial applications! Features: real-time data modeling, data logging, MQTT broker/client/spB, audit trail, alarms & events, visual SQL query database gateway, high-performance smart displays, HTML5 dashboards, WPF drawing tools, iOS app, trends & annotations, reporting & more! You can program scripts in C#, VB.NET, JavaScript and Python. With ZERO install on the client side, and only 2 minutes install server side, you can be up and building performance improving applications in no time! Includes dozens of built-in native protocol drivers to PLCs, DCSs, and support for other industry standards, like OPC and MQTT. Need a driver we don’t have yet? We also have a toolkit for protocol driver development! FactoryStudio can act as your data hub for everything in your industrial ecosystem: your link between IT and OT, your real-time devices, and your SQL data sources with easy data-binding

Starting Price: $960 one-time fee

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5

DbSchema

Wise Coders

DbSchema is for visual designing the schema in a team, deploy and document the schema. Other integrated features like data explorer, visual query editor, data generator, etc., makes DbSchema an every-day tool for everybody who interacts with databases. DbSchema supports all relational and No-SQL databases, including MySQL, PostgreSQL, SQLite, Microsoft SQL Server, MongoDB, MariaDB, Redshift, Snowflake, Google and more. DbSchema is reverse-engineering the database schema from the database and visualize it as diagrams. You will interact with the database using diagrams and visual tools. DbSchema model is using its copy of schema structure, independent from the database. This allows the schema deployment on multiple databases, save the design model to file, store it in GIT and design the schema in a team, design the schema without database connectivity, compare different versions of the schema and generate SQL migration scripts.

1 Rating

Starting Price: $63 one time payment

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6

ERD Lab

ERD Lab

ERD Lab is an online ER Diagram Tool that allows you to design your database visually. Import existing SQL or develop new database without writing a single line of code. Visualize your schemas to share & collaborate with your team. Export SQL or PDF/Image when done. All for FREE!

1 Rating

Starting Price: $0

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7

Oracle Analytics Cloud

Oracle

Oracle Analytics is a complete platform for every analytics user role. AI and ML are embedded throughout the platform to accelerate productivity and power better business decisions. Choose either Oracle Analytics Cloud, our cloud native service, or our on-premises solution, Oracle Analytics Server, both of which help you avoid compromising security and governance. Oracle Analytic addresses all needs of business users from data to decision. Oracle Analytics can help you solve your business problems with built in data preparation and enrichment, no-code machine learning and industry leading data visualization.

Starting Price: $16 User Per Month - Oracle An

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8

Quary

Quary

Connect to your data warehouse, and SSO authenticates your team in seconds. Organize your business intelligence as SQL. Make changes with confidence, automated testing validates every update. Deploy models confidently and travel back in time when things go wrong. Quary connects to your sensitive data store. In order to protect it, Quary is built from the ground up with security in mind. By default, data does not leave your estate, data exchanges happen between your Quary client and your data store. Transform data together, model, test, and deploy as a team. SSO is not an extra, we include it in our base plan and even help set it up. No one should share credentials. Quary builds upon your data store's access management systems and helps you manage it. We are in the process of implementing SOC2 and have security credentials (CISSP) on the team to ensure your data stays secure.

Starting Price: Free

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9

Software Ideas Modeler

Software Ideas

Software Ideas Modeler is an essential tool in software engineering. It is a feature-rich CASE tool that can help you with software design using various diagram notations and modeling tools. Try our UML modeler, ERD designer, flowchart maker, wireframing tools, or BPMN editor for free. The diagramming modules are optimized for particular tasks in the specific domain. Tools for UML diagrams, Layer diagrams, Flowcharts, and Data Flow Diagrams and others help you design your software or its crucial parts properly. Documentation and glossary modules in our CASE tool allow you to communicate your design effectively. Professionally process the user requirements using Advanced Use Case analysis or User Stories depending on your preference. Turn code to diagrams using the code analytic tools for many popular programming languages. Generate source code scaffold and code parts using source code generators, also using custom code templates.

Starting Price: $68 one-time payment

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10

ERBuilder

Softbuilder

ERBuilder Data Modeler is a GUI data modeling tool that allows developers to visualize, design, and model databases by using entity relationship diagrams and automatically generates the most popular SQL databases. Generate and share the data Model documentation with your team. Optimize your data model by using advanced features such as test data generation, schema compare, and schema synchronization.

Starting Price: $49

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11

HeidiSQL

HeidiSQL

HeidiSQL is free software, and has the aim to be easy to learn. "Heidi" lets you see and edit data and structures from computers running one of the database systems MariaDB, MySQL, Microsoft SQL, PostgreSQL and SQLite. Invented in 2002 by Ansgar, HeidiSQL belongs to the most popular tools for MariaDB and MySQL worldwide. Free for everyone, OpenSource. Connect to multiple servers in one window. Supported database systems: MariaDB, MySQL, MS SQL, PostgreSQL and SQLite. Connect to servers via commandline. Connect via SSH tunnel, or pass SSL settings. Create and edit tables, views, stored routines, triggers and scheduled events. Generate nice SQL-exports, compress these afterwards, or put them on the clipboard. Export from one server/database directly to another server/database. Manage user-privileges, import text-files, export table rows as CSV, HTML, XML, SQL, LaTeX, Wiki Markup and PHP Array. Browse and edit table-data using a comfortable grid.

Starting Price: $0

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12

Hackolade

Hackolade

Hackolade is the pioneer for data modeling of NoSQL and multi-model databases, providing a comprehensive suite of data modeling tools for various NoSQL databases and APIs. Hackolade is the only data modeling tool for MongoDB, Neo4j, Cassandra, ArangoDB, BigQuery, Couchbase, Cosmos DB, Databricks, DocumentDB, DynamoDB, Elasticsearch, EventBridge Schema Registry, Glue Data Catalog, HBase, Hive, Firebase/Firestore, JanusGraph, MariaDB, MarkLogic, MySQL, Oracle, PostgreSQL, Redshift, ScyllaDB, Snowflake, SQL Server, Synapse, TinkerPop, YugabyteDB, etc. It also applies its visual design to Avro, JSON Schema, Parquet, Protobuf, Swagger and OpenAPI, and is rapidly adding new targets for its physical data modeling engine.

Starting Price: €100 per month

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13

ERDPlus

ERDPlus

A database modeling tool for creating entity relationship diagrams, relational schemas, star schemas, and SQL DDL statements. ERDPlus is a web-based database modeling tool that lets you quickly and easily create Entity Relationship Diagrams (ERDs). Works with most contemporary RDBMS tools including Oracle, MySQL, Microsoft SQL Server, PostgreSQL, Teradata, IBM DB2, Microsoft Access, and others. The notation supports drawing regular and weak entities, various types of attributes (regular, unique, multi-valued, derived, composite, and optional), and all possible cardinality constraints of relationships (mandatory-many, optional-many, mandatory-one, and optional-one). The tool supports the quick creation of foreign keys and referential integrity lines by simple click-point-connect actions. This simplifies and quickens the process of creating relational schemas. The notation distinguishes fact tables from dimension tables by using a thicker frame around fact tables.

Starting Price: Free

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14

Zebra AI

Zebra BI

AI-powered Business Intelligence. Cut through the data modeling hassle. Create sales dashboards, get insights, & collaborate instantly. Build sales dashboards in less than 15 seconds. Whether you’re a business analyst, a BI consultant, or a CEO, anyone can work with Zebra AI: just upload your data and let our AI work the data & generate your dashboard instantly. We’ve made Zebra AI secure – because your business data should be yours alone, and not part of a massive machine learning project. You don’t need another chart maker. Zebra AI is your trusty consultant to help you spot trends, retrieve information, and make compelling presentations. Share your dashboards and AI chats. Enable your entire team to work with the same source of truth – and all of this, in just a couple of clicks. This is more than just a powerful chatbot: it’s a tool experienced data analysts can wield to be more effective – no matter how complex your question or analysis is.

Starting Price: $16/month

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15

5X

5X

5X is an all-in-one data platform that provides everything you need to centralize, clean, model, and analyze your data. Designed to simplify data management, 5X offers seamless integration with over 500 data sources, ensuring uninterrupted data movement across all your systems with pre-built and custom connectors. The platform encompasses ingestion, warehousing, modeling, orchestration, and business intelligence, all rendered in an easy-to-use interface. 5X supports various data movements, including SaaS apps, databases, ERPs, and files, automatically and securely transferring data to data warehouses and lakes. With enterprise-grade security, 5X encrypts data at the source, identifying personally identifiable information and encrypting data at a column level. The platform is designed to reduce the total cost of ownership by 30% compared to building your own platform, enhancing productivity with a single interface to build end-to-end data pipelines.

Starting Price: $350 per month

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16

RapidMiner

Altair

RapidMiner is reinventing enterprise AI so that anyone has the power to positively shape the future. We’re doing this by enabling ‘data loving’ people of all skill levels, across the enterprise, to rapidly create and operate AI solutions to drive immediate business impact. We offer an end-to-end platform that unifies data prep, machine learning, and model operations with a user experience that provides depth for data scientists and simplifies complex tasks for everyone else. Our Center of Excellence methodology and the RapidMiner Academy ensures customers are successful, no matter their experience or resource levels. Simplify operations, no matter how complex models are, or how they were created. Deploy, evaluate, compare, monitor, manage and swap any model. Solve your business issues faster with sharper insights and predictive models, no one understands the business problem like you do.

Starting Price: Free

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17

Count

Count

Count is a fully collaborative and reactive data whiteboard. It brings together all the flexibility and creativity of a whiteboard, with the power of a SQL IDE, and the reactivity of BI notebooks. It makes it easy to break apart complex SQL queries and data models into interconnected cells to better understand the logic. Add sticky notes and visuals to help explain your work to stakeholders. Collaborate with other analysts or stakeholders as you build so you can get feedback faster. Turn any canvas into an interactive report or slideshow presentation.

Starting Price: $34 per editor per month

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18

Oracle SQL Developer Data Modeler

Oracle

Oracle SQL Developer Data Modeler is a free graphical tool that enhances productivity and simplifies data modeling tasks. Using Oracle SQL Developer Data Modeler users can create, browse and edit, logical, relational, physical, multi-dimensional, and data type models. The Data Modeler provides forward and reverse engineering capabilities and supports collaborative development through integrated source code control. The Data Modeler can be used in both traditional and in Cloud environments. Oracle SQL Developer Data Modeler is one of the database tools in the Oracle Database Tools group. It is an independent, standalone product with a full spectrum of data and database modeling tools and utilities. There is a general FAQ and other supporting collateral on the Data Modeler home page. This document is to provide some guidance to the pricing-related questions arising in the community.

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19

DTM Data Modeler

DTM Data Modeler

DTM Data Modeler is a CASE tool for database developers that supports both forward and reverse engineering. It is an easy-to-use tool allowing you to work both with logical and physical data models in the form of an entity-relationship diagram. The product is intended for database architects and developers and works with data sources via the ODBC interface, which means compatibility with all modern DBMS. Along with basic model properties (sets of entities and relationships between them), the program allows you to create indexes and triggers on the physical level corresponding to the tables of the database that is modeled. The foreign key migration feature makes schema development easier and more visual and also reduces the probability of errors in the integrity of the model. The program can create database schema objects directly in the database as well as create SQL scripts corresponding to the model and taking into account the settings specified by the user.

Starting Price: $75 per year

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20

RestApp

RestApp

RestApp is a No Code Data Activation platform that empowers anyone with an all-in-one solution to connect, model, and sync any data with his favorite tools. RestApp enables Data & Ops teams to activate data in minutes with No-Code by: - Connecting with your favorite databases and business apps - Modeling your data with drag-and-drop SQL, NoSQL and Python functions and then easily creating and sharing your queries with your teammates - Syncing automatically your data with your tools. With RestApp, you are notably able by using our templates to: - Computing your main financial KPIs: churn rate, MRR, ARR, ACV, ARPU, LVT - Computing your customers’ lead scoring - Generate automatic cohort analysis

Starting Price: Free

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21

GibsonAI

GibsonAI

GibsonAI is an innovative AI-powered database engineer that revolutionizes the entire database lifecycle by automating everything from design to deployment. With a simple conversation in plain English, users can instantly generate complete database solutions including entity-relationship diagrams, optimized schemas, fully deployed hosted databases, live CRUD APIs, and comprehensive documentation—all without writing SQL or managing DevOps. The platform enables effortless modifications through natural language commands, eliminating manual migrations and downtime, making it ideal for developers seeking to accelerate development, startups launching scalable applications, and enterprise teams streamlining database engineering and maintenance.

Starting Price: $20/month

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22

erwin Data Modeler

Quest Software

Make enterprise data more manageable and accessible with erwin Data Modeler. The most trusted data modeling software, erwin Data Modeler is used by the world's top brands to create a unified view of any data from anywhere to increase its use, understanding and trust across the organization. erwin Data Modeler is available in three editions: Standard, Workgroup, and Navigator.

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23

Valentina Studio

Paradigma Software

Create, administer, query and explore Valentina DB, MySQL, MariaDB, PostgreSQL and SQLite databases for FREE. Design business reports running in Valentina Studio Pro, on Valentina Server or in an application with an Application Developer Kit. Backward Engineering in Standard with forwarding Engineering in Valentina Studio Pro. Reverse engineering and create diagrams for existing databases. Add new objects to diagrams. Write SQL queries with auto-completion, color syntax. Define, manage, save favorite queries; access recent queries. Function browser dictionary of each function. Consoles for errors, warnings, and performance. Search, Export result records into CSV, JSON, Excel. Edit properties of multiple objects at the same time. Drill down to tables and fields; incredible fast searching. Reverse engineering and create diagrams for existing databases. Add new objects to diagrams. Add/drop users, and groups, and manage privileges.

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24

Databricks Data Intelligence Platform

Databricks

The Databricks Data Intelligence Platform allows your entire organization to use data and AI. It’s built on a lakehouse to provide an open, unified foundation for all data and governance, and is powered by a Data Intelligence Engine that understands the uniqueness of your data. The winners in every industry will be data and AI companies. From ETL to data warehousing to generative AI, Databricks helps you simplify and accelerate your data and AI goals. Databricks combines generative AI with the unification benefits of a lakehouse to power a Data Intelligence Engine that understands the unique semantics of your data. This allows the Databricks Platform to automatically optimize performance and manage infrastructure in ways unique to your business. The Data Intelligence Engine understands your organization’s language, so search and discovery of new data is as easy as asking a question like you would to a coworker.

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25

Apache Spark

Apache Software Foundation

Apache Spark™ is a unified analytics engine for large-scale data processing. Apache Spark achieves high performance for both batch and streaming data, using a state-of-the-art DAG scheduler, a query optimizer, and a physical execution engine. Spark offers over 80 high-level operators that make it easy to build parallel apps. And you can use it interactively from the Scala, Python, R, and SQL shells. Spark powers a stack of libraries including SQL and DataFrames, MLlib for machine learning, GraphX, and Spark Streaming. You can combine these libraries seamlessly in the same application. Spark runs on Hadoop, Apache Mesos, Kubernetes, standalone, or in the cloud. It can access diverse data sources. You can run Spark using its standalone cluster mode, on EC2, on Hadoop YARN, on Mesos, or on Kubernetes. Access data in HDFS, Alluxio, Apache Cassandra, Apache HBase, Apache Hive, and hundreds of other data sources.

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26

Montara

Montara

Montara enables BI teams and data analysts, using SQL only, to model and transform their data easily and seamlessly and enjoy benefits such as modular code, CI/CD, versioning and automated testing and documentation. With Montara, analysts can quickly understand how changes to models impact analysis, reports and dashboards with report-level lineage and support for 3rd party visualization tools such as Tableau and Looker. Furthermore, BI teams can perform ad-hoc analysis and create reports and dashboards on Montara directly.

Starting Price: $100/user/month

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27

ExoCoding

ExoCoding

ExoCoding is a code generation online platform that empowers software developers to build better software faster. It uses model-based AI-powered assistants to generate boilerplate code and streamline repetitive tasks. Developers can create apps containing modules with Database Management, Logic Building, and Interface Design. There are also more features like sharing prototypes, task planning, and a marketplace with pre-built templates that enhance the developer’s experience. After generating code (backend and frontend), everything is business as usual with the same IDE and other dev tools, but with much work already accomplished.

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28

ZinkML

ZinkML Technologies

ZinkML is a zero-code data science platform designed to address the challenges faced by organizations in leveraging data effectively. By providing a visual and intuitive interface, it eliminates the need for extensive coding expertise, making data science accessible to a broader range of users. ZinkML streamlines the entire data science lifecycle, from data ingestion and preparation to model building, deployment, and monitoring. Users can drag-and-drop components to create complex data pipelines, explore data visually, and build predictive models without writing a single line of code. The platform also offers automated feature engineering, model selection, and hyperparameter tuning, accelerating the model development process. Moreover, ZinkML provides robust collaboration features, enabling teams to work together seamlessly on data science projects. By democratizing data science, we empower companies to extract maximum value from their data and drive better decision-making.

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