
Mockaroo
DataConstruct
Data Creator
Datamade
Random Data
Generate and manage synthetic datasets easily with DUMMY DATABASE

Slack
Rocket.Chat
Discord
Telegram
Element.io
Zulip
Microsoft Teams
Mattermost is an open source alternative to Slack.

Which is more popular?
Based on our record, Mattermost seems to be more popular. It has been mentioned 76 times since March 2021.
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | dummydatabase.com | mattermost.com |
| Pricing | ||
| Platforms | — | |
| Company | Startup from Serbia · 1 - 9 employees · 2024 | Startup from the United States |
| Listed in |
In their own words, as submitted to SaaSHub.


Dummy Database is built to solve a simple, yet annoying problem — generating realistic test datasets quickly, without writing scripts or juggling Excel files. It’s designed for: - Developers needing dummy databases for prototyping & testing. - Analysts and BI specialists preparing demo...
No description of Mattermost yet.
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Mattermost is recommended for organizations that prioritize data privacy and security, need extensive customization options, or are looking to integrate a collaboration tool into existing systems. It is also suitable for teams in regulated industries requiring on-premises solutions.
Walkthroughs and reviews on video.
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Mattermost - An Open Source, Self Hosted, Slack Chat Alternative
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing DUMMY DATABASE and Mattermost.
DUMMY DATABASE's answer
A free, all-in-one data generation platform that builds everything from simple tables to full relational databases with advanced controls, unique event sequences, ERD visualization, built-in SQL querying, and multiple export formats — no limits, no paywalls.
DUMMY DATABASE's answer
Unlike other data generators, DUMMY DATABASE gives you full relational database creation, unique event simulations, advanced control over every field, built-in SQL querying, and generous free limits — so you can go from idea to test-ready data without restrictions, subscriptions, or hidden fees
DUMMY DATABASE's answer
DUMMY DATABASE's answer
Began as a project for myself to be able to have custom datasets for testing purpose I've decided that it could be useful for wider audience and finalized it as a full-stack web project
DUMMY DATABASE's answer
Python, Flask, HTML, CSS, Bootstrap, Redis, PostgreSQL, JavaScript
Share your experience with using DUMMY DATABASE and Mattermost. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


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Mattermost is an open-source platform that enables safe collaboration in self-hosted chat programs featuring file sharing, search, and integrations; groups and businesses can use it as an internal chat.
Mattermost uses monolithic architecture, which is tightly coupled and complex to understand. It restricts the scalability of the collaboration tool, which is a limitation for growing businesses. In that case,...
Below is a curated list of the 12 best self-hosted messaging apps like MirrorFly, Mattermost, Zulio, Nextcloud, and Rocket.chat that offer unique collaboration features and lets you take full control of your data.
Recommendations tracked on public social media and blogs since March 2021.


Tracking DUMMY DATABASE since Aug 2025.
Mattermost | Remote (US and Canada) | FT | Multiple roles Mattermost (https://mattermost.com) is an open-core collaboration and workflow automation platform for air-gapped, on-prem and private clouds. Our customers are in defense,... - Source: Hacker News / 11 days ago
The amazing thing is that there is almost always an open-source alternative that is 10x better in many ways, in the case of slack https://mattermost.com/ I'm looking forward for AI to make it very easy to deploy your own tools and walk... - Source: Hacker News / about 2 months ago
How does it compare to MatterMost [1]? [1] https://mattermost.com/. - Source: Hacker News / 5 months ago
When comparing DUMMY DATABASE and Mattermost, you can also consider the following products.
A realistic data generator to test your app
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Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.
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Data generator that can create a table filled with pseudo-random content.
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Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
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