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Apple CloudKit vs Supabase

Apple CloudKit: Apple's iCloud record store for apps: private per-user data, a public database and built-in sync. Supabase: Open-source Postgres backend platform: database, auth, storage, realtime and edge functions in one project.

key differences

  • Apple CloudKit is primarily a document database; Supabase is relational.
  • Licensing: Apple CloudKit is proprietary (Proprietary Apple service); Supabase is open source (permissive) (Apache License 2.0).
  • Apple CloudKit is built for larger datasets (≤ 1 PB) than Supabase (≤ 10 TB).
  • Horizontal scaling is native in Apple CloudKit and none in Supabase.
  • Transactions: Apple CloudKit offers limited ACID; Supabase offers full.
  • Only Apple CloudKit has online schema changes, offline sync.
  • Only Supabase has joins, full-text search, vector search, json, triggers.
  • Apple CloudKit has a serverless option; Supabase does not.

choose apple-cloudkit for

  • +Syncing app data across a user's iPhone, iPad and Mac
  • +Indie and Apple-only apps that want a backend without servers
  • +Collaborative documents and lists shared between iCloud users
  • +Core Data or SwiftData apps that need cloud backup and sync

best at · Mobile/offline, OLTP, Content

choose supabase for

  • +MVPs and startups needing a complete backend quickly
  • +AI-generated apps from Lovable, Bolt and similar builders
  • +Mobile and web apps with auth and file uploads
  • +Realtime collaborative features via Postgres changes

best at · OLTP, Vector search, RAG

Apple CloudKitApple's iCloud record store for apps: private per-user data, a public database and built-in sync.
SupabaseOpen-source Postgres backend platform: database, auth, storage, realtime and edge functions in one project.
overview
Primary model
Document
Relational
Also supports
Key-Value
Document, Vector, Spatial
Type
Managed service
Backend platform
Status
Active
Active
Developer
Apple
Supabase, Inc.
First release
2014
2020
Latest version
–
v1.26.08 (self-hosted) (Aug 7, 2026)
License
ProprietaryProprietary Apple service
Open source (permissive)Apache License 2.0
Free tier
✓
✓
popularity
WhichDB Score
25.8
54.3
Rank
#116
#23
GitHub stars
–
114.1K
Stack Overflow questions
2.4K
2.1K
scale & guarantees
Comfortable data size
Large (≤ 1 PB)
Medium (≤ 10 TB)
Horizontal scaling
Native
None
Multi-region
None
Read replicas
ACID
Limited
Full
Consistency
Eventual, Strong
Strong
Schema
Flexible
Strict
Architecture
Serverless, Distributed
Primary replica, Client server
deployment
Self-hosted
—
✓
Vendor-managed cloud
✓
✓
Serverless
✓
—
Embedded
—
—
Edge
—
—
Clouds
–
AWS, Vercel
capabilities
Transactions
✓
✓
Joins
—
✓
Secondary indexes
✓
✓
Full-text search
—
✓
Vector search
—
✓
Geospatial
✓
✓
JSON
—
✓
Change data capture
✓
✓
Triggers
—
✓
Stored procedures
—
✓
Materialized views
—
✓
TTL / expiry
—
—
Pub/Sub
✓
✓
Columnar storage
—
—
In-memory
—
—
Durable persistence
✓
✓
Compression
—
—
Encryption at rest
✓
✓
Role-based access
✓
✓
Time travel
—
—
Branching
—
✓
Online schema changes
✓
—
Streaming ingest
—
—
Offline sync
✓
—
Runs in WebAssembly
—
—
interfaces
Query languages
CKQuery (NSPredicate)
SQL, PL/pgSQL, GraphQL
Client languages
Swift, Objective-C, JavaScript
JavaScript, Python, Dart, Swift, Kotlin, C#, Go, Rust
Best for
Mobile/offline, OLTP, Content
OLTP, Vector search, RAG, Content
Add more to this comparisonNot sure either fits? Try smart match

Apple CloudKit vs Supabase: FAQ

What is the difference between Apple CloudKit and Supabase?

Apple CloudKit: Apple's iCloud record store for apps: private per-user data, a public database and built-in sync. Supabase: Open-source Postgres backend platform: database, auth, storage, realtime and edge functions in one project. Apple CloudKit is primarily a document database; Supabase is relational. Licensing: Apple CloudKit is proprietary (Proprietary Apple service); Supabase is open source (permissive) (Apache License 2.0). Apple CloudKit is built for larger datasets (≤ 1 PB) than Supabase (≤ 10 TB).

When should I choose Apple CloudKit over Supabase?

Choose Apple CloudKit for syncing app data across a user's iPhone, iPad and Mac; indie and Apple-only apps that want a backend without servers; and collaborative documents and lists shared between iCloud users. Choose Supabase for MVPs and startups needing a complete backend quickly; AI-generated apps from Lovable, Bolt and similar builders; and mobile and web apps with auth and file uploads.

Is Apple CloudKit or Supabase more popular?

Supabase ranks #23 on the WhichDB Score (54.3/100) and Apple CloudKit ranks #116 (25.8/100). Popularity is not fit: check the requirements that matter for your project.

Are Apple CloudKit and Supabase open source?

No. Apple CloudKit is proprietary, closed-source software. Yes. Supabase is open source. License: Apache License 2.0.