Source: https://seerepo.com/compare/rtk-ai/rtk/vs/unionlabs/union
Markdown source: https://seerepo.com/compare/rtk-ai/rtk/vs/unionlabs/union.md
Description: rtk and union share 8 technologies: axum, SQLite, tower, Tokio, crossterm, Ratatui, tracing, and tracing-subscriber. Both are written in Rust.

# rtk vs union

rtk and union share 8 technologies: axum, SQLite, tower, Tokio, crossterm, Ratatui, tracing, and tracing-subscriber. Both are written in Rust.

- [rtk-ai/rtk](https://seerepo.com/r/rtk-ai/rtk): CLI proxy that reduces LLM token consumption by 60-90% on common dev commands. Single Rust binary, zero dependencies
- [unionlabs/union](https://seerepo.com/r/unionlabs/union): The trust-minimized, zero-knowledge bridging protocol, designed for censorship resistance, extremely high security, and usage in decentralized finance.

## What they share and what sets them apart

- In common: axum, SQLite, tower, Tokio, crossterm, Ratatui, tracing, tracing-subscriber
- Only in rtk: rusqlite, tiktoken-rs, image, quick-xml
- Only in union: net/http, Gorilla, sqlx-postgres, Postgres, moka, sqlx, wasmtime, Svelte, SvelteKit, Supabase, @effect/platform, console, ed25519-dalek, schemars, github.com/rs/zerolog, tracing-opentelemetry, OpenTelemetry, opentelemetry-otlp, Tailwind CSS, tailwind-merge, rehype-stringify, remark, remark-parse, unified, vfile, @effect/opentelemetry

## Side by side

| | rtk | union |
|---|---|---|
| Size | 219,272 lines written, 253 code files | 468,416 lines written, 1,841 code files |
| Who writes it | 33.7% of its commits signed by AI. With Claude Code, Codex, and Cursor | 0% of its commits signed by AI. With CodeRabbit |
| Activity | Last push November 4, 2026, 1,914 commits, 85,563 stars | Last push July 25, 2026, 13,299 commits, 73,725 stars |
| Tests | 84 test files. 4% of its code files have a test that imports them | 120 test files. 10.4% 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, rtk or union?

union, with 468,416 lines written; rtk has 219,272.

The proof: [unionlabs/union's code at commit 031785b](https://github.com/unionlabs/union/tree/031785bb6dc6b957c624e62bc64c184409c97d7b)

### Which has more GitHub stars, rtk or union?

rtk, with 85,563 stars; union has 73,725.

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

### Which has more tests, rtk or union?

union, with 120 test files; rtk has 84.

The proof: [unionlabs/union's code at commit 031785b](https://github.com/unionlabs/union/tree/031785bb6dc6b957c624e62bc64c184409c97d7b)

### Which was updated more recently, rtk or union?

rtk: its last push was on November 4, 2026, and union's on July 25, 2026.

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

### Which has more commits signed by AI, rtk or union?

rtk: an AI signed 33.7% of its commits, with Claude Code, Codex, and Cursor.

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

## Sources

- rtk-ai/rtk: Read on November 4, 2026, at commit b47e05b (https://github.com/rtk-ai/rtk/tree/b47e05b5df0c60ba1afbf3ba2492ad9e60fa340a)
- unionlabs/union: Read on November 5, 2026, at commit 031785b (https://github.com/unionlabs/union/tree/031785bb6dc6b957c624e62bc64c184409c97d7b)

## 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.