PlanetScale vs RxDB
A detailed comparison to help you choose between PlanetScale and RxDB.
Quick Verdict
4.4/5
PlanetScale
357 reviews
3.9/5
RxDB
336 reviews
PlanetScale is rated higher (4.4 vs 3.9). PlanetScale is serverless MySQL-compatible database with git-like branching, non-blocking schema changes, and auto-scaling. Used by companies serving billions of queries. RxDB is a real-time, offline-first NoSQL database for JavaScript applications. Works in the browser, Node.js, React Native, and Electron. Syncs with CouchDB, Firestore, and others.
PlanetScale Serverless MySQL with database branching | RxDB Reactive database for JavaScript apps with real-time sync | |
|---|---|---|
| Overview | ||
| Rating | 4.4 (357 reviews)✓ | 3.9 (336 reviews) |
| Pricing model | freemium | free |
| Starting price | Free tier available | Free |
| Best for | Teams running MySQL at scale who need schema migrations without downtime | JavaScript/TypeScript developers building offline-capable apps requiring real-time data reactivity across multiple browser contexts. |
| Specifications (entry plan) | ||
| CPU cores | 0 vCPU | — |
| RAM | 0 GB | — |
| Storage | 0 GB | — |
| Bandwidth | 0 TB/mo | — |
| SLA uptime | 99.99% | — |
| Data-center count | 6 | — |
| Features | ||
| IPv6 | ||
| DDoS protection | ||
| Automated backups | ✓ | |
| Snapshots | ||
| Managed option | ||
| Bare metal | ||
| GPU available | ||
| S3-compatible | ||
| Hourly billing | ||
| Free tier | ✓ | |
| Data-center locations | ||
| Regions | United StatesEuropean Union | — |
| Tags | ||
| Tags | free tiermanaged optionbackups includedeu datacenterus datacenterapi access | free tieropen source |
| Visit PlanetScale → | Visit RxDB → | |
PlanetScale
Pros
- + Non-blocking schema changes — no downtime migrations
- + Database branching like git
- + Auto-scales to handle traffic spikes
Cons
- - No foreign keys (Vitess architecture limitation)
- - Read replicas only on higher plans
RxDB
Pros
- + Build reactive queries with RxJS observables for live data updates
- + Sync data across tabs, devices, and optional cloud backend
- + Work completely offline with automatic conflict resolution
- + Use multiple storage engines via plugins for different environments
Cons
- - Steeper learning curve for developers unfamiliar with RxJS reactive patterns
- - Self-hosted sync server setup required for cross-device features
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