★ 404
August 2025
AGPL-3.0
Learning
What we checked ourselves
Not copied from the project's own blurb. These are things we opened and verified, with the date.
- 9 Sept 2026We checked that the link to the project still resolves.
- 13 Sept 2026We read the licence text itself (LICENSE). No unusual restrictions were stated.
- 2 Sept 2026We read the project's own documentation and found no sign that development has stopped.
Where this sits among the 38 tools we list in Learning
- Commercial use confirmed as allowed19 of 38
- Requires terminal commands30 that do not →
- Requires an API key30 that do not →
- Sends your input to the provider13 that do not →
Counted from our own checks: every tool we list is examined against the same criteria.
What it does
A teaching project that exists to show how Cursor and its peers actually work underneath, built up increment by increment alongside a written series — the premise being that understanding the mechanism lets you drive these tools harder or write your own. The author is explicit that it's a teaching tool, points you at Goose, Roo/Cline, Aider or AllHands if you want something that works today, and says up front they won't be handling issue reports. AGPL-3.0.
Summary based on the project's own description. The Japanese page has a fuller beginner guide: setup difficulty, what to prepare, and a step-by-step start.
Screenshots & visuals
Before you start
- Setup difficultyFor advanced users
- Command lineRequired
- API keyRequired
- Sends data onlineYes
Judged automatically from the project's own metadata. Always confirm on the official page.
groundhog FAQ
- Is groundhog free?
- groundhog itself is free, but it needs an API key for an external AI service. That service charges separately, though some have a free tier.
- Do I need to install anything or write code to use groundhog?
- It needs the command line. If you are not comfortable typing commands, expect to get stuck during setup.
- Does groundhog work on a phone?
- No. It needs a computer.
- Can I use groundhog commercially?
- The licence is AGPL-3.0. Using it commercially is fine, but if you distribute something built on it you may be required to release that under the same licence. Keep it internal, or check before distributing.
How it compares
The conditions that decide whether you can actually use it, side by side.
| Tool | Command line | API key | Sends data out | Phone | Commercial use |
|---|---|---|---|---|---|
| groundhog (this page) | Required | Required | Yes | No | Yes |
| introtodeeplearning | Not needed | Not needed | Yes | No | Yes |
| what_are_embeddings | Not needed | Not needed | Yes | No | Not verified |
| LaTeX-OCR | Required | Not needed | No | No | Yes |
"Sends data out" means your input is uploaded to someone's server. Pick "No" when the material cannot leave your organisation.