PowerSync

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.

PowerSync publishes 6 APIs on the APIs.io network. Tagged areas include Developer Tools, Database, Sync, Offline-First, and SQLite.

The PowerSync catalog on APIs.io includes 1 JSON-LD context.

PowerSync’s developer surface includes documentation, engineering blog, pricing, changelog, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

28.1/100 thin ▬ flat Agent 3/100 human only Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-10-04 · rubric v0.23.0

AccessFreemium

6 APIs

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

Kin Score

Kin Score How this is scored →
scored 2026-10-04 · rubric v0.23.0

Composite quality — 28.1/100 · thin

Contract Quality 2.3 / 21

Developer Ergonomics 2.0 / 17

Access Clarity 8.0 / 17

Operational Transparency 6.9 / 11

Contract Governance 0.0 / 10

Discoverability 5.3 / 9

Regulatory Posture 1.6 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/powersync: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 6

Individual APIs this provider publishes, each with its own machine-readable definition.

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.

Pricing Plans 1

Published pricing tiers and plan structures.

Powersync Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Powersync Rate Limits

10 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Powersync Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Powersync Context

4 classes · 37 properties

JSON-LD

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Powersync Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

StatusPage

StatusPage

ChangeLog

ChangeLog

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

aid: powersync
name: PowerSync
description: '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.'
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/powersync.png
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
tags:
- Developer Tools
- Database
- Sync
- Offline-First
- SQLite
- Local-First
- Real-Time
url: https://raw.githubusercontent.com/api-evangelist/powersync/refs/heads/main/apis.yml
created: '2026-06-12'
modified: '2026-06-12'
specificationVersion: '0.23'
apis:
- aid: powersync:sync-service
  name: PowerSync Sync Service API
  description: 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 the service streams real-time checkpoint and operation
    data back, enabling incremental SQLite sync for offline-first apps.
  humanURL: https://docs.powersync.com/architecture/powersync-service
  tags:
  - Sync
  - Streaming
  - SQLite
  - Real-Time
  properties:
  - type: Documentation
    url: https://docs.powersync.com/architecture/powersync-service
  - type: Documentation
    url: https://docs.powersync.com/architecture/powersync-protocol
- aid: powersync:javascript-sdk
  name: PowerSync JavaScript / Web SDK
  description: Client SDK for JavaScript and browser environments using Wasm-backed SQLite. Provides a PowerSyncDatabase class
    for local SQLite management with reactive queries, offline write queuing, and automatic sync with the PowerSync Service.
  humanURL: https://docs.powersync.com/client-sdk-references/js-web
  tags:
  - JavaScript
  - Web
  - SQLite
  - SDK
  properties:
  - type: Documentation
    url: https://docs.powersync.com/client-sdk-references/js-web
  - type: Documentation
    url: https://powersync-ja.github.io/powersync-js/web-sdk
- aid: powersync:react-native-sdk
  name: PowerSync React Native SDK
  description: 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.
  humanURL: https://docs.powersync.com/client-sdk-references/react-native
  tags:
  - React Native
  - Mobile
  - SQLite
  - SDK
  properties:
  - type: Documentation
    url: https://docs.powersync.com/client-sdk-references/react-native
  - type: Documentation
    url: https://powersync-ja.github.io/powersync-js/react-native-sdk
- aid: powersync:flutter-sdk
  name: PowerSync Flutter / Dart SDK
  description: Client SDK for Flutter and Dart applications providing embedded SQLite sync with Rust-backed native connection
    pools and built-in encryption support.
  humanURL: https://docs.powersync.com/client-sdk-references/flutter
  tags:
  - Flutter
  - Dart
  - Mobile
  - SDK
  properties:
  - type: Documentation
    url: https://docs.powersync.com/client-sdk-references/flutter
  - type: Documentation
    url: https://pub.dev/packages/powersync
- aid: powersync:kotlin-sdk
  name: PowerSync Kotlin SDK
  description: Client SDK for Kotlin Multiplatform applications, enabling offline-first Android and cross-platform apps with
    embedded SQLite synced to backend databases.
  humanURL: https://docs.powersync.com/client-sdk-references/kotlin-multiplatform
  tags:
  - Kotlin
  - Android
  - Mobile
  - SDK
  properties:
  - type: Documentation
    url: https://docs.powersync.com/client-sdk-references/kotlin-multiplatform
- aid: powersync:swift-sdk
  name: PowerSync Swift SDK
  description: Client SDK for Swift applications enabling offline-first iOS and macOS apps with embedded SQLite synced to
    backend databases via the PowerSync Service.
  humanURL: https://docs.powersync.com/client-sdk-references/swift
  tags:
  - Swift
  - iOS
  - macOS
  - SDK
  properties:
  - type: Documentation
    url: https://docs.powersync.com/client-sdk-references/swift
common:
- type: DomainSecurity
  url: security/powersync-domain-security.yml
- type: Website
  url: https://powersync.com/
- type: Documentation
  url: https://docs.powersync.com/
- type: GitHubOrganization
  url: https://github.com/powersync-ja
- type: LinkedIn
  url: https://www.linkedin.com/showcase/journeyapps-powersync/
- type: Blog
  url: https://powersync.com/blog
- type: Pricing
  url: https://powersync.com/pricing
- type: StatusPage
  url: https://status.powersync.com/
- type: X
  url: https://twitter.com/powersync_
- type: ChangeLog
  url: https://releases.powersync.com/
- type: Plans
  url: plans/powersync-plans-pricing.yml
- type: RateLimits
  url: rate-limits/powersync-rate-limits.yml
- type: FinOps
  url: finops/powersync-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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