fx

fx

Vercel
+
+

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About

Morph FastApply is a specialized AI infrastructure tool designed to dramatically improve how AI coding agents edit and update source code. Instead of rewriting entire files or relying on fragile search-and-replace operations, FastApply merges AI-generated code changes directly into existing files using a semantic understanding of the code structure. It works by allowing an AI model to output only the relevant modifications to a file while marking unchanged sections with placeholders. The FastApply model then merges those changes server-side, reconstructing the complete updated file while preserving formatting, syntax, comments, and dependencies. This approach significantly reduces the number of tokens required and eliminates many of the errors caused by traditional diff-based or search-and-replace editing methods. It processes edits at speeds of over 10,500 tokens per second with approximately 98% accuracy.

About

fx is a tiny, open, native coding agent harness and CLI written in Zig, optimized for research, performance, and embeddability as part of larger systems. Its design focuses on minimalism across the system prompt, tools, feature set, memory use, and a 6 MB binary, with an interface intended to feel closer to a Unix shell than a heavy terminal IDE. fx cold starts in microseconds and performs no unnecessary work or I/O before accepting input, making it suitable for programmatic use, resource-constrained environments, and agent sandboxes. Developers can start it inside a project and ask it to read files, search code, run commands, make changes, execute tests, and stream tool calls as they happen. The core is model- and provider-agnostic, supporting local models, gateways, direct provider access, and cloud inference. It is context-efficient by design, using a minimal system prompt and toolset to reduce token overhead and improve time to first token.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Software developers building AI coding agents or developer tools wanting a reliable system to merge AI-generated code edits into existing codebases

Audience

Developers and AI infrastructure builders in need of a solution to run or embed a lightweight, extensible, model-agnostic coding agent in terminals, applications, and automated systems

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

Pricing

$20 per month
Free Version
Free Trial

Pricing

Free
Free Version
Free Trial

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
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Morph
United States
www.morphllm.com/products/fastapply

Company Information

Vercel
Founded: 2015
United States
fx.sh/

Alternatives

Zoo Code

Zoo Code

Roo Code

Alternatives

Categories

Categories

Integrations

GitHub
Morph Glance
Morph WarpGrep

Integrations

GitHub
Morph Glance
Morph WarpGrep
Claim Morph Fast Apply and update features and information
Claim Morph Fast Apply and update features and information
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