Source: https://seerepo.com/compare/headroomlabs-ai/headroom/vs/iii-hq/iii
Markdown source: https://seerepo.com/compare/headroomlabs-ai/headroom/vs/iii-hq/iii.md
Description: headroom and iii share 10 technologies: axum, rusqlite, Redis, SQLite, Tokio, tower, Pydantic, OpenTelemetry, tracing, and tracing-subscriber. headroom is written in Python and iii in Rust.

# headroom vs iii

headroom and iii share 10 technologies: axum, rusqlite, Redis, SQLite, Tokio, tower, Pydantic, OpenTelemetry, tracing, and tracing-subscriber. headroom is written in Python and iii in Rust.

- [headroomlabs-ai/headroom](https://seerepo.com/r/headroomlabs-ai/headroom): Compress tool outputs, logs, files, and RAG chunks before they reach the LLM. 20% fewer tokens for coding agents, 60-95% fewer tokens for JSON, same answers. Library, proxy, MCP server.
- [iii-hq/iii](https://seerepo.com/r/iii-hq/iii): Effortlessly compose, extend, and observe every service in real-time for the first time ever.

## What they share and what sets them apart

- In common: axum, rusqlite, Redis, SQLite, Tokio, tower, Pydantic, OpenTelemetry, tracing, tracing-subscriber
- Only in headroom: FastAPI, lru, Rich, gcp_auth, autogen-agentchat, litellm, hf-hub, ort, tiktoken, tokenizers, tiktoken-rs, prometheus, @opencode-ai/plugin, @ai-sdk/provider, ai
- Only in iii: React, lapin, console, indicatif, cliclack, zip, schemars, jsonschema, github.com/invopop/jsonschema, opentelemetry-api, go.opentelemetry.io/otel, go.opentelemetry.io/otel/trace, tracing-opentelemetry, go.opentelemetry.io/otel/sdk, go.opentelemetry.io/otel/metric, go.opentelemetry.io/otel/log, go.opentelemetry.io/otel/sdk/log, go.opentelemetry.io/otel/sdk/metric, opentelemetry-sdk, opentelemetry-otlp, opentelemetry-http

## Side by side

| | headroom | iii |
|---|---|---|
| Size | 789,601 lines written, 773 code files | 523,734 lines written, 690 code files |
| Who writes it | 28.1% of its commits signed by AI. With Claude Code, GitHub Copilot, Codex, Cursor, Devin, and Mistral Vibe | 4.9% of its commits signed by AI. With Claude Code, CodeRabbit, Cursor, and GitHub Copilot |
| Activity | Last push November 4, 2026, 3,201 commits, 78,851 stars | Last push November 6, 2026, 2,181 commits, 18,926 stars |
| Tests | 1,220 test files. 68.2% of its code files have a test that imports them | 452 test files. 21.4% of its code files have a test that imports them |

- Size: Lines written by people and agents, without generated ones; code files, without tests.
- Who writes it: A commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
- Activity: From GitHub and its history, on the day SeeRepo read it.
- Tests: The files that test the code, and the share of code files a test imports.

## Frequently asked questions

### Which is bigger, headroom or iii?

headroom, with 789,601 lines written; iii has 523,734.

The proof: [headroomlabs-ai/headroom's code at commit 31dcaf4](https://github.com/headroomlabs-ai/headroom/tree/31dcaf41f7fafaebec0838a05ff328da456faef0)

### Which has more GitHub stars, headroom or iii?

headroom, with 78,851 stars; iii has 18,926.

The proof: [headroomlabs-ai/headroom on GitHub](https://github.com/headroomlabs-ai/headroom)

### Which has more tests, headroom or iii?

headroom, with 1,220 test files; iii has 452.

The proof: [headroomlabs-ai/headroom's code at commit 31dcaf4](https://github.com/headroomlabs-ai/headroom/tree/31dcaf41f7fafaebec0838a05ff328da456faef0)

### Which was updated more recently, headroom or iii?

iii: its last push was on November 6, 2026, and headroom's on November 4, 2026.

The proof: [iii-hq/iii's commits on GitHub](https://github.com/iii-hq/iii/commits)

### Which has more commits signed by AI, headroom or iii?

headroom: an AI signed 28.1% of its commits, with Claude Code, GitHub Copilot, Codex, Cursor, Devin, and Mistral Vibe; in iii, 4.9%.

The proof: [the commits each tool signed in headroomlabs-ai/headroom](https://seerepo.com/r/headroomlabs-ai/headroom/ai)

## Sources

- headroomlabs-ai/headroom: Read on November 4, 2026, at commit 31dcaf4 (https://github.com/headroomlabs-ai/headroom/tree/31dcaf41f7fafaebec0838a05ff328da456faef0)
- iii-hq/iii: Read on November 6, 2026, at commit 4094bb4 (https://github.com/iii-hq/iii/tree/4094bb423d98f87ebef8fa7347891fbc485b71db)

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.