PFCL is an open-source project built for functional programmers and software developers.

Yes — PFCL is open source under the Open Source license and free to use.

What platforms does PFCL run on?

PFCL runs on the web and the command line. It can also be self-hosted.

Is PFCL still maintained?

Unverified. PFCL has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What projects are similar to PFCL?

Similar projects tracked by PulseGate include jupydeep, demystify-voice, and Pyxle.

Yes — PFCL is open source under the Open Source license.

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PFCL

composure.systemsInfrastructure

PFCL is a small pure functional language in which functions are pure, total, and identified by SHA-256 hashes of their typed source bodies. Programs are assembled from YAML catalog entries without imports or package versioning, while effects are represented as data for a host program to execute.

Open SourceWebCLISelf-hosted

Visit composure.systems

Overview

8 features

PFCL is a Frameworks & SDKs project. It focuses on building reliable software compositions without package managers, mutable effects, or ambiguous function identity. PFCL is an open-source project aimed at functional programmers and software developers. The project is open source (Open Source). It ships for the web and the command line, and it can be self-hosted.

Key capabilities include pure functions, totality checking, and termination witnesses.

Summary written by a language model from the project’s public pages.

Pure functions
Totality checking
Termination witnesses
Content-addressed identity
YAML catalog
Typed function bodies
Composition-based programs
Data-based effects

Built with & integrations

Runs on

BrowserCLISelf-hosted

Trust & compliance

License

Open Source

Verified signals

HTTPSOpen SourceFree tier

Indexing history

What PulseGate has recorded for this listing

Indexed27 Aug · 05:42 UTC
Listing verified against its public source
Source: PulseGate · Open

Frequently asked questions about PFCL

What does PFCL do?: PFCL focuses on building reliable software compositions without package managers, mutable effects, or ambiguous function identity. It is catalogued under Frameworks & SDKs on PulseGate.
Who should use PFCL?: PFCL is an open-source project built for functional programmers and software developers.
Is PFCL free?: Yes — PFCL is open source under the Open Source license and free to use.
What platforms does PFCL run on?: PFCL runs on the web and the command line. It can also be self-hosted.
Is PFCL still maintained?: Unverified. PFCL has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What projects are similar to PFCL?: Similar projects tracked by PulseGate include jupydeep, demystify-voice, and Pyxle.jupydeep demystify-voice Pyxle
Is PFCL open source?: Yes — PFCL is open source under the Open Source license.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
First seen: 27 Aug 2026
Built for: functional programmers and software developers
Model: Open source
Solves: Building reliable software compositions without package managers, mutable effects, or ambiguous function identity.

Developer

Composuresystems

Index record

Identity confidence: Medium · 72.8
Indexed: 27 Aug 2026
Lifecycle: Alive
First seen: Aug 2026
Last seen: 27 Aug 2026

Identity audit (13)

Slug: pfcl-pure-functional-composition-language-composure-systems
Lifecycle state recorded: 27 Aug 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 27 Aug 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 27 Aug 2026
Canonical URL: https://composure.systems/

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