# PowerSync

**Canonical:** https://apis.io/providers/powersync/  
**Website:** https://powersync.com/  
**APIs profiled:** 6

PowerSync is a sync engine that automatically synchronizes backend databases (Postgres, MongoDB, MySQL, SQL Server) with client-side SQLite, enabling offline-first and local-first applications. It consists of two components: the PowerSync Service (available as a managed cloud service or self-hosted via Docker) and a set of open-source client SDKs. Client SDKs are available for JavaScript/Web, React Native, Flutter/Dart, Kotlin, Swift, Node.js, .NET, and Rust. Authentication is handled via JWT tokens, with support for major providers including Auth0, Firebase, Supabase, Amazon Cognito, and Azure AD. PowerSync streams database changes in real-time so clients can query and mutate local SQLite without waiting on the network.

## Kin Score — 30.1 / 100 (thin)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 30.1).

| Facet | Score |
|---|---|
| Discoverability | 64.8 |
| Contract Quality | 10.7 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 65.8 |
| Developer Ergonomics | 11.9 |
| Commercial Clarity | 50.0 |
| Access Clarity | 50.0 |

## Agent readiness — 2.5 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Freemium — onboarding: unknown, pricing: freemium, trial: no (confidence: medium).

## APIs (6)

- **PowerSync Sync Service API** — The PowerSync Service exposes a streaming sync protocol over HTTP/WebSocket that client SDKs connect to using JWT authentication. Clients submit their current bucket state and t...
- **PowerSync JavaScript / Web SDK** — Client SDK for JavaScript and browser environments using Wasm-backed SQLite. Provides a PowerSyncDatabase class for local SQLite management with reactive queries, offline write ...
- **PowerSync React Native SDK** — Client SDK for React Native and Expo applications, enabling offline-first mobile apps backed by embedded SQLite synced to Postgres, MongoDB, MySQL, or SQL Server.
- **PowerSync Flutter / Dart SDK** — Client SDK for Flutter and Dart applications providing embedded SQLite sync with Rust-backed native connection pools and built-in encryption support.
- **PowerSync Kotlin SDK** — Client SDK for Kotlin Multiplatform applications, enabling offline-first Android and cross-platform apps with embedded SQLite synced to backend databases.
- **PowerSync Swift SDK** — Client SDK for Swift applications enabling offline-first iOS and macOS apps with embedded SQLite synced to backend databases via the PowerSync Service.

## Security (1)

- **Powersync Domain Security** — TLSv1.3 · HSTS · DMARC

## Plans (1)

- **Powersync Plans Pricing**

## Tags

Developer Tools, Database, Sync, Offline-First, SQLite, Local-First, Real-Time

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/powersync/). Scores are computed from the provider's own public artifacts under a published rubric.