★ 1.0k
August 2026
Apache-2.0
AI agents
What we checked ourselves
Not copied from the project's own blurb. These are things we opened and verified, with the date.
- 23 Aug 2026We checked that the link to the project still resolves.
- 14 Aug 2026We read the licence text itself (LICENSE). No unusual restrictions were stated.
- 31 Jul 2026We read the project's own documentation and found no sign that development has stopped.
Where this sits among the 114 tools we list in AI agents
- No API key required29 of 114
- Keeps your data on your own machine11 of 114
- Commercial use confirmed as allowed95 of 114
- Requires terminal commands21 that do not →
Only 9 of the 114 meet all of the conditions above.
Counted from our own checks: every tool we list is examined against the same criteria.
What it does
Coding agents start from zero every session — the decisions, constraints, rejected approaches and failed attempts from last week are invisible to them. This builds a local Tantivy index over those session logs and gives current agents a way to find the earlier discussion before repeating it. Everything stays on your machine. Worth remembering that old sessions sometimes contain keys and passwords you typed, so glance at what you're surfacing before you pass it on. Apache-2.0.
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 difficultySome setup needed
- Command lineRequired
- API keyNot required
- Sends data onlineNo
Judged automatically from the project's own metadata. Always confirm on the official page.
ctx FAQ
- Is ctx free?
- Yes. It runs on your own machine, so there is no usage-based cost either.
- Do I need to install anything or write code to use ctx?
- It needs the command line. If you are not comfortable typing commands, expect to get stuck during setup.
- Does ctx work on a phone?
- No. It needs a computer.
- Can I use ctx commercially?
- The licence is Apache-2.0, which permits commercial use. Conditions such as keeping the copyright notice still apply, so read the licence text before shipping it inside something.
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 |
|---|---|---|---|---|---|
| ctx (this page) | Required | Not needed | No | No | Yes |
| openclaw | Required | Required | Yes | No | Not verified |
| AutoGPT | Required | Required | Yes | No | Yes |
| langflow | Required | Required | Yes | No | Yes |
"Sends data out" means your input is uploaded to someone's server. Pick "No" when the material cannot leave your organisation.