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Redis vs MongoDB

Side-by-side comparison of features, pricing, ratings, and alternatives.

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Redis
RedisIn-memory data store for caching and real-time apps.
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MongoDB
MongoDBThe popular document (NoSQL) database.
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Overview
Description

Redis is an in-memory key-value data store used for caching, session storage, queues, and real-time features, prized for its speed. It supports rich data structures beyond simple key-value.

MongoDB is a document-oriented NoSQL database that stores data as flexible JSON-like documents, popular for its schema flexibility and developer ergonomics. MongoDB Atlas offers a fully managed cloud service.

Pricing
Contact for Pricing

Open source; Redis Cloud managed plans available.

Contact for Pricing

Free community edition and Atlas free tier; paid Atlas scales up.

Category
Databases
Databases
Best for
Backend developers
Developers building flexible apps
Specifications
Spec source
AI-estimated
AI-estimated
platforms
Windows, Mac, Linux
Windows, Mac, Linux, Web
deployment
Self-hosted
Cloud/SaaS
open source
Yes
Yes
api available
Yes
Yes
Pros & Cons
Pros
  • Extremely fast
  • Versatile data structures
  • Great for caching
  • Widely supported
  • Flexible schema
  • Good developer experience
  • Managed Atlas option
  • Scales horizontally
Cons
  • In-memory means RAM cost
  • Persistence needs configuration
  • Not a primary relational store
  • Not ideal for heavily relational data
  • Costs grow with Atlas usage
  • Consistency trade-offs to understand
Community & Metrics
Upvotes
7
5
User rating
4.7 (3)
4.0 (3)

What reviewers say

Redis Reviews

4.7 (3)
Anonymous

Great database

Redis has been part of our stack. Widely supported. Minor gripe: persistence needs configuration. Would recommend.

Anonymous

Solid choice

Been using Redis for a while. Versatile data structures. No real complaints. Would recommend.

Anonymous

Recommend Redis

Been using Redis for a while. Widely supported. No real complaints. Would recommend.

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MongoDB Reviews

4.0 (3)
Anonymous

Solid choice

Been using MongoDB for a while. Flexible schema. Minor gripe: consistency trade-offs to understand. Would recommend.

Anonymous

Great database

Been using MongoDB for a while. Good developer experience. Minor gripe: not ideal for heavily relational data. Would recommend.

Anonymous

Solid choice

MongoDB has been part of our stack. Good developer experience. Minor gripe: costs grow with atlas usage. Would recommend.

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More alternatives & similar tools

Alternatives to Redis

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MongoDB
MongoDB

The popular document (NoSQL) database.

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ClickHouse
ClickHouse

Column-store database management system

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redis
redis

In-memory data store for real-time web applications

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etcd
etcd

Distributed key-value store for shared configuration and service discovery

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Alternatives to MongoDB

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PostgreSQL
PostgreSQL

The advanced open-source relational database.

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Redis
Redis

In-memory data store for caching and real-time apps.

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Firebase
Firebase

Google’s app development platform with realtime backend.

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The Verdict

AI-generated from listing data

Redis is the safer default for ultra‑fast caching and real‑time workloads, while MongoDB excels when you need flexible document storage and horizontal scaling.

Key differences

  • •Data model: Redis uses in‑memory key/value with rich structures; MongoDB stores persistent JSON‑like documents.
  • •Persistence: Redis requires explicit configuration for durability; MongoDB persists data by default.
  • •Scaling model: Redis scales vertically (more RAM) and via clustering; MongoDB scales horizontally via sharding and managed Atlas.
  • •Typical use: Redis is optimized for caching, pub/sub, and session storage; MongoDB is built for flexible schema applications.
DimensionWinner

Pricing & value

MongoDB offers a free community edition and free Atlas tier; Redis pricing is contact‑based and may be higher for managed cloud.

MongoDB

Ease of use / learning curve

Redis has a simple key/value API and limited commands; MongoDB’s document model and aggregation can be more complex.

Redis

Features & depth

Both provide APIs and core features for their domains; Redis excels at sub‑ms ops, MongoDB at rich queries.

Tie

Integrations & ecosystem

MongoDB’s Atlas SaaS, drivers for many languages, and web platform give broader integration options than Redis.

MongoDB

Scalability

MongoDB supports horizontal sharding and managed scaling; Redis primarily scales by adding RAM or using clustering.

MongoDB

Support

Both are open source with commercial options; specific support levels not detailed in facts.

Tie

Security & privacy

Both are open source and can be secured; no specific security features listed in the provided facts.

Tie

Choose Redis if…

Backend teams needing sub‑millisecond caching, pub/sub, or session storage with full control over deployment.

Choose MongoDB if…

Developers building flexible, schema‑less apps that require persistent storage and horizontal scaling.

Common questions

Which tool is cheaper to start with?

MongoDB offers a free community edition and free Atlas tier; Redis requires contacting sales for pricing.

Can Redis be used as a primary database?

Redis is primarily an in‑memory cache; persistence is optional and not its main purpose.

Do both products support managed cloud services?

MongoDB has Atlas managed cloud; Redis offers managed Redis Cloud plans, but primary deployment is self‑hosted.