Tool
B
Aider
Open-source AI pair programming in your terminal, git-native.
⚠ Preliminary, based on public research, hands-on test pending. These scores come from a desk review of public sources (official pricing pages, docs, changelogs), linked on each tool page. Rex hasn't run the hands-on tests yet, so tiers shown are projected. Under our rubric, a tool's official tier is capped at B until it's tested.
What looks good
- Free and open source; works with many model providers and local models
- Git-native: auto-commits each change with a message
Watch-outs
- Release cadence has slowed: latest stable v0.86.2 was published Feb 12, 2026
- Less autonomous than newer agent tools
From public sources below, not from our own hands-on testing (yet).
Scores
Best AI coding agents B70/100
Rank #9 · projected tier B · official tier B (untested cap) · ⚠ Preliminary
Free, open source, git-native classic. Release cadence has slowed (last stable Feb 2026).
Pricing as found Oct 15, 2026
| Plan | Price | Notes |
|---|---|---|
| Open source | $0 | Bring your own model/API key or local models |
Prices in USD, excluding tax. Vendors change pricing often; check the official page before buying.
Sources
- Aider site (aider.chat)
- Aider release history (aider.chat)
- PyPI aider-chat 0.86.2 (pypi.org)
Accessed Oct 15, 2026. Spot an error? Request a correction.