Coding · segment

Open-source

The tool itself is open source.

No independent measure ranks this whole set, so no crown. Shortlist ordered by Open source; the basis is stated, not hidden.

5 eligibledata as of 2026-07-04
Aider Paul Gauthier (Aider-AI) C live
Pricing
free (open source; pay chosen LLM API)
official
Model
BYO / multi-model (Claude, GPT, DeepSeek, Gemini, local)
official
Agentic
assist only
official
Open source
open · Apache-2.0
official
Form
CLI
official
Free tier
open self-host
official
Quality no independent measure
Best freeOpen-source ✓ 2026-07-04
Cline Cline Bot Inc. C live
Pricing
free (tool; BYO API key, pay provider token costs)
official
Model
BYO / multi-model (Anthropic, OpenAI, Gemini, local)
official
Agentic
yes
official
Open source
open · Apache-2.0
official
Form
IDE plugin
official
Free tier
open self-host
official
Quality no independent measure
Best freeOpen-sourceAgentic ✓ 2026-07-04
OpenAI Codex OpenAI A live
Pricing
Free · Go $8/mo · Plus $20/mo · Pro $100–200/mo · API usage-based
official
Model
own (GPT-5.5 / GPT-5.4 / GPT-5.4 mini)
official
Agentic
yes
official
Open source
open · Apache-2.0 (CLI only; cloud/models closed)
official
Form
cloud agent (+ CLI + IDE)
official
Free tier
limited
official
Quality no independent measure
Best freeOpen-sourceAgentic ✓ 2026-07-04
Qwen3-Coder Alibaba (Qwen team) A live
Pricing
free open weights (self-host) or usage-based via Alibaba Cloud API
official
Model
own (Qwen3-Coder 480B-A35B MoE)
official
Agentic
yes
official
Open source
open · Apache-2.0 (weights + CLI)
official
Form
CLI
official
Free tier
open self-host
official
Quality no independent measure
Best freeOpen-sourceAgentic ✓ 2026-07-04
Zed Zed Industries B live
Pricing
Personal free · Pro $10/mo · Business $30/seat/mo
official
Model
BYO / multi-model + own edit-prediction model (Zeta)
official
Agentic
yes
official
Open source
open · GPL-3.0-or-later
official
Form
IDE
official
Free tier
limited
official
Quality no independent measure
Best freeOpen-sourceAgentic ✓ 2026-07-04