Redis vs MongoDB Atlas
The real-time data platform — in-memory DB + cache + vector + search
vs. Managed MongoDB with search, vector, stream processing
Pricing tiers
Redis
Free
30 MB. Single DB. Community support. AWS + GCP only.
Free
Redis OSS
BSD-licensed Redis (or source-available RSALv2 for newer). Self-host free.
$0 base (usage-based)
Essentials
From $5/mo. 250 MB to 100 GB. SAML SSO, RBAC, 99.99% uptime.
$5/mo
Pro
From $200/mo. Dedicated. Active-Active multi-region. Auto-tiering. 99.999% uptime.
$200/mo
Enterprise
Custom annual. SOC2, HIPAA, private deployment.
Custom
MongoDB Atlas
M0 — Free
Shared cluster, 512 MB storage, 100 ops/sec, 32 MB sort memory. Learning/exploration.
Free
Flex — Serverless
Autoscales 0-500 ops/sec. 5 GB storage. Pay-as-you-go, up to ~$30/mo.
$8/mo
M2 — Shared
Shared, 2 GB storage. Staging / small apps.
$9/mo
M5 — Shared
Shared, 5 GB storage.
$25/mo
M10 — Dedicated
2 GB RAM, 2 vCPU, 10-128 GB storage. First dedicated tier.
$57/mo
M20 — Dedicated
4 GB RAM, 2 vCPU, 20-256 GB storage.
$144/mo
M30 — Dedicated
8 GB RAM, 2 vCPU, 40-512 GB storage.
$389/mo
M40 — Dedicated
16 GB RAM, 4 vCPU, 80 GB-1 TB storage.
$749/mo
M50 — Dedicated
32 GB RAM, 8 vCPU, 160 GB-4 TB storage.
$1440/mo
M60 — Dedicated
64 GB RAM, 16 vCPU.
$2844/mo
M80 — Dedicated
128 GB RAM, 32 vCPU, 750 GB-4 TB.
$5256/mo
M300 — Dedicated
384 GB RAM, 96 vCPU.
$15732/mo
Enterprise
Multi-region Advanced, private network, BYOK, dedicated support.
Custom
Free-tier quotas head-to-head
Comparing free on Redis vs m0 on MongoDB Atlas.
| Metric | Redis | MongoDB Atlas |
|---|---|---|
| backups | — | 0 backups |
| ops per sec | — | 100 ops/sec |
| sort memory mb | — | 32 MB |
| storage gb | — | 0.5 GB |
Features
Redis · 21 features
- Active-Active (CRDT) — Multi-region live-write replication.
- Auto-Tiering (Flex) — RAM + SSD tiered storage.
- Bitmaps + Bitfields — Compact boolean storage.
- Geo — Geospatial queries on lat/lon.
- Hashes — Field-value maps per key.
- HyperLogLog — Probabilistic cardinality.
- Lists — Linked list — push/pop/range.
- Lua Scripting — Server-side Lua + Functions.
- Pub/Sub — Channel-based messaging.
- RedisBloom — Bloom + Cuckoo + Count-Min Sketch + TopK.
- Redis Cluster — Horizontal sharding.
- RediSearch — Full-text + vector search engine.
- RedisInsight — Official GUI for Redis.
- RedisJSON — Native JSON document support.
- RedisTimeSeries — Time-series data type.
- Replication — Primary-replica async replication.
- Sets — Unique element sets.
- Sorted Sets (ZSet) — Score-ranked sets for leaderboards.
- Streams — Append-only log (Kafka-like).
- Strings — Primitive + binary-safe key-value.
- Transactions (MULTI/EXEC) — Atomic command batches.
MongoDB Atlas · 14 features
- Atlas App Services — Backend-as-a-service: Functions, HTTPS endpoints, users + auth, sync.
- Atlas Charts — Embedded dashboards + visualizations from Atlas data.
- Atlas Database — Core MongoDB with automated backups, monitoring, scaling on AWS/Azure/GCP.
- Atlas Data Federation — Query across Atlas, S3, and HTTP endpoints in one pipeline.
- Atlas Device Sync (Realm) — Offline-first mobile DB that syncs bidirectionally with Atlas.
- Atlas Search — Apache Lucene-based full-text search integrated into MongoDB aggregation pipelin…
- Atlas Stream Processing — Continuous processing of MongoDB change streams + Kafka. Pipeline aggregations o…
- Atlas Triggers — Database change triggers, scheduled triggers. Run Atlas Functions (Node.js).
- Atlas Vector Search — Vector similarity search via $vectorSearch operator. HNSW index. Up to 4096 dims…
- BYOK Encryption — Bring your own KMS key (AWS KMS, Azure Key Vault, GCP KMS).
- Data API — Read/write via REST. Alternative to drivers for edge/serverless.
- Multi-Region Clusters — Single cluster distributed across multiple regions for HA + low latency.
- Online Archive — Tiered storage: automatic cold data movement to cheaper S3-backed storage.
- Private Networking — VPC Peering, PrivateLink, CIDR allowlist.
Developer interfaces
| Kind | Redis | MongoDB Atlas |
|---|---|---|
| CLI | redis-cli | Atlas CLI, MongoDB Shell (mongosh) |
| SDK | go-redis, Jedis + Lettuce, node-redis, redis-py, redis-rs | Atlas Device SDK (Realm), MongoDB Go Driver, MongoDB Java Driver, MongoDB .NET/C# Driver, mongodb (Node driver), mongodb (Rust), pymongo |
| REST | Redis Cloud API | Atlas Admin API, Atlas Data API |
| MCP | — | MongoDB MCP Server |
| OTHER | RedisInsight GUI, RESP protocol | MongoDB Compass (GUI), MongoDB Wire Protocol |
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