Who should use astern?

astern is an open-source project built for developers using Claude Code.

Yes — astern is open source under the MIT license and free to use.

What platforms does astern run on?

astern runs on the command line. It can also be self-hosted.

Is astern still active?

The GitHub repository shows 33 commits in the last 90 days.

What are alternatives to astern?

Similar projects tracked by PulseGate include scorchmark, Cross Community Portal, and PromptFix.

astern is developed by Thor Whalen.

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astern

Name: astern
Author: Thor Whalen

PyPIInfrastructure

astern is an open-source command-line tool that analyzes past Claude Code session transcripts. It surfaces recurring problems, workflow friction, rewritten code, and vocabulary differences between developers and their coding agents.

Open SourceMITCLISelf-hosted

Visit PyPI

Overview

7 features

In the Other LLM eval space, astern takes a focused approach. It focuses on reviewing past Claude Code sessions to find recurring development problems, friction, rewrites, and communication gaps. astern is an open-source project aimed at developers using Claude Code. astern is open source under the MIT license. astern is available on the command line, and it can be self-hosted.

Thor Whalen builds and maintains astern, and it first shipped in 2026. The project is developed in the open on GitHub with 33 commits in the last 90 days. Key capabilities include session mining, transcript analysis, and problem detection.

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

Session mining
Transcript analysis
Problem detection
Friction analysis
Rewrite detection
Vocabulary gap analysis
Retrospectives

Built with & integrations

AI providers

anthropic

Written with

Claude Code

Runs on

CLISelf-hosted

Written with — evidence

Claude Code: .claude/

Trust & compliance

License

MIT

Verified signals

HTTPSOpen SourceFree tierGitHubActive maintenance

Indexing history

What PulseGate has recorded for this listing

Indexed9 Sept · 02:05 UTC
astern verified via PyPI Bulk Enumerator
Source: PyPI Bulk Enumerator · Open

Frequently asked questions about astern

What is astern?: Astern focuses on reviewing past Claude Code sessions to find recurring development problems, friction, rewrites, and communication gaps. It is catalogued under Other LLM eval on PulseGate.
Who should use astern?: astern is an open-source project built for developers using Claude Code.
Is astern free?: Yes — astern is open source under the MIT license and free to use.
What platforms does astern run on?: astern runs on the command line. It can also be self-hosted.
Is astern still active?: The GitHub repository shows 33 commits in the last 90 days.
What are alternatives to astern?: Similar projects tracked by PulseGate include scorchmark, Cross Community Portal, and PromptFix.scorchmark Cross Community Portal PromptFix
Who develops astern?: astern is developed by Thor Whalen.
How long has astern been around?: astern first shipped in 2026.

At a glance

Platforms: CLI
Languages: English
Open source: Yes (GitHub)
License: MIT
First seen: 9 Sept 2026
Built for: developers using Claude Code
Model: Open source
Solves: Reviewing past Claude Code sessions to find recurring development problems, friction, rewrites, and communication gaps.

Registered as

GitHub: thorwhalen/astern
PyPI: astern

Developer

Thor Whalen

Small team

GitHub

Open source

View on GitHub

Stars: 0
Forks: 0
Open issues: 1
Last commit: 7 Sept 2026
Commits 90d: 33
Contributors: 2
Authorship: Small team
Default branch: main

Index record

Indexed: 9 Sept 2026
Lifecycle: Alive
First seen: Sept 2026
Last seen: 9 Sept 2026

Identity audit (13)

Slug: astern-pypi-org
Lifecycle state recorded: 9 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 9 Sept 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Written by a language model from the project's public pages.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model from page content.
Last updated: 9 Sept 2026
Canonical URL: https://pypi.org/project/astern

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