
SQL Fiddle
DB Fiddle
Online SQL Editor
Rextester
Online SQL playground for testing and sharing SQL snippets. SQLite, MySQL and PostgreSQL.

MarkLogic Server
Datomic
Valentina Server
Datahike
Matisse
Oracle TimesTen
SAP MaxDB
Easily develop rich applications using a fully managed, scalable, and serverless document database.

Which is more popular?
Based on our record, Firestore seems to be more popular. It has been mentioned 3 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | extendsclass.com | cloud.google.com |
| Company | 2022 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


It is a SQL playground which allows to test SQL online. Run SQL queries for SQLite, MySQL and PostgreSQL databases. Share snippets.
No description of Firestore yet.
What each product offers, as listed by its team.


No features have been listed yet.
Possible disadvantages
An editorial look at what each product does well and who it suits.


No analysis of ExtendsClass SQL Online yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
No ExtendsClass SQL Online videos yet. You could help us improve this page by suggesting one.
Firestore v10: Setup & Free Tier in 4 Mins (2026)
More videos
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using ExtendsClass SQL Online and Firestore. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


Tracking ExtendsClass SQL Online since Oct 2022.
Firestore for Inbox, Outbox, and Distributed Lock. - Source: dev.to / 12 months ago
Your app must be stateless. Don't use embedded databases. When your users hit your app again, they may be reaching another instance in a completely different state. Persist data in cloud-based storage like GCS, Cloud SQL, or Cloud... - Source: dev.to / almost 2 years ago
Google Firestore is a serverless document database providing direct web, IoT, and mobile app development access. It’s highly scalable with no maintenance window and zero downtime. - Source: dev.to / about 2 years ago
When comparing ExtendsClass SQL Online and Firestore, you can also consider the following products.

A tool for easy online testing and sharing of database problems and their solutions.
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MarkLogic Server is a multi-model database that has both NoSQL and trusted enterprise data management capabilities.
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An online tool for testing, sharing and collaborating on SQL snippets
Compare DB Fiddle to ExtendsClass SQL Online or Firestore:

The fully transactional, cloud-ready, distributed database
Compare Datomic to ExtendsClass SQL Online or Firestore:

Free Online SQL Editor
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Valentina Server is 3 in 1: Valentina DB Server / SQLite Server / Report Server
Compare Valentina Server to ExtendsClass SQL Online or Firestore: