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About

Bun is a fast, all-in-one JavaScript, TypeScript, and JSX toolkit that ships as a single executable and combines a high-performance runtime, package manager, test runner, and bundler designed as a drop-in replacement for Node.js with broad compatibility and dramatically reduced startup times and memory usage. Written in Zig and powered by Apple’s JavaScriptCore, Bun can execute JavaScript/TypeScript files, scripts, and packages with significantly faster performance than traditional tooling while supporting zero-config TypeScript, JSX, and React out of the box. Its built-in package manager installs dependencies up to 30x faster than npm with workspaces, global caching, migration support, and dependency auditing. Bun’s test runner is Jest-compatible with built-in coverage and concurrent execution, and the bundler processes TypeScript, JSX, CSS, and more without configuration, including support for single-file executables.xx

About

Third-party APIs change while your code depends on them: a model ID is retired, a field is removed, or an API version reaches end of life. Dependabot updates package versions, but it does not tell you which lines call the changed API. Upseam does. It reads vendor changelogs and deprecation notices for Stripe, Shopify, OpenAI, Anthropic, and Gemini, matches them against JavaScript, TypeScript, and Python code, and identifies the affected lines. Then it opens a pull request with the fix. It never pushes to your default branch. In Ask mode (the default), you approve each fix before a pull request opens, including simple fixes such as a renamed model ID. Install the GitHub App or run a one-off local report with npx @upseam/cli inspect. The local report requires no account or installation. Upseam is free during the beta.

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Not Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Developers and teams building JavaScript and TypeScript applications who want a fast, all-in-one runtime and toolkit to run, test, bundle, and manage packages with high performance and Node.js compatibility

Audience

Teams whose code calls third-party APIs.

Support

Phone Support Not Supported
24/7 Live Support Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

API

Offers API Not Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported

Pricing

$0
Free during beta. Customers supply their own OpenAI or Anthropic model credentials; model usage charges are billed by the selected provider.
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Bun
Founded: 2022
United States
bun.com

Company Information

Upseam
upseam.dev/

Alternatives

Alternatives

Versionveil

Versionveil

Synov8 Ltd
gitStream

gitStream

LinearB
LemonadeJS

LemonadeJS

Jspreadsheet
Serpent

Serpent

Tekunda
WebStorm

WebStorm

JetBrains

Categories

Package Managers Supported

Categories

DevOps Supported

Integrations

Anthropic Not Supported
CSS Supported
Claude Code Not Supported
Codex CLI Not Supported
CybeDefend Supported
Dependabot Not Supported
JavaScript Supported
MySQL Supported
Node.js Supported
OpenAI Not Supported
OpenCode Not Supported
PostgreSQL Supported
React Supported
SQL Supported
SQLite Supported
Slack Not Supported
TypeScript Supported
Zig Supported
boat Supported
websockets Supported

Integrations

Anthropic Supported
CSS Not Supported
Claude Code Supported
Codex CLI Supported
CybeDefend Not Supported
Dependabot Supported
JavaScript Not Supported
MySQL Not Supported
Node.js Not Supported
OpenAI Supported
OpenCode Supported
PostgreSQL Not Supported
React Not Supported
SQL Not Supported
SQLite Not Supported
Slack Supported
TypeScript Not Supported
Zig Not Supported
boat Not Supported
websockets Not Supported
Claim Bun and update features and information
Claim Bun and update features and information
Claim Upseam and update features and information
Claim Upseam and update features and information