Source: https://seerepo.com/compare/grpc/grpc-rust/vs/unionlabs/union
Markdown source: https://seerepo.com/compare/grpc/grpc-rust/vs/unionlabs/union.md
Description: grpc-rust and union share 6 technologies: axum, Tokio, tower, console, tracing, and tracing-subscriber. Both are written in Rust.

# grpc-rust vs union

grpc-rust and union share 6 technologies: axum, Tokio, tower, console, tracing, and tracing-subscriber. Both are written in Rust.

- [grpc/grpc-rust](https://seerepo.com/r/grpc/grpc-rust): A native gRPC client & server implementation with async/await support.
- [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, Tokio, tower, console, tracing, tracing-subscriber
- Only in grpc-rust: tower-layer, google-cloud-auth, opentelemetry
- Only in union: async-graphql, async-graphql-axum, net/http, Gorilla, cometbft-rpc, cosmos-client, depolama, sqlx-postgres, cosmossdk.io/store, cw-storage-plus, Postgres, moka, github.com/cosmos/cosmos-db, sqlx, github.com/cosmos/cosmos-sdk, cosmossdk.io/core, cosmossdk.io/x/upgrade, github.com/cometbft/cometbft/api, github.com/CosmWasm/wasmd, cosmossdk.io/api, wasmtime, Svelte, SvelteKit, Supabase, @effect/platform, SQLite, cliclack, Ratatui, crossterm, throbber-widgets-tui, access-managed, access-manager-types, bip32, ed25519-dalek, schemars, cosmossdk.io/log, github.com/rs/zerolog, cw-orch, tracing-opentelemetry, OpenTelemetry, opentelemetry-otlp, Tailwind CSS, tailwind-merge, @number-flow/svelte, rehype-rewrite, rehype-stringify, remark, remark-parse, unified, vfile, @effect/opentelemetry

## Side by side

| | grpc-rust | union |
|---|---|---|
| Size | 142,127 lines written, 309 code files | 468,416 lines written, 1,876 code files |
| Who writes it | 0.1% of its commits signed by AI. With Cursor | 0% of its commits signed by AI. With CodeRabbit |
| Activity | Last push November 11, 2026, 1,657 commits, 12,537 stars | Last push July 25, 2026, 13,299 commits, 73,718 stars |
| Tests | 83 test files. 22% of its code files have a test that imports them | 120 test files. 10.2% 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, grpc-rust or union?

union, with 468,416 lines written; grpc-rust has 142,127.

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

### Which has more GitHub stars, grpc-rust or union?

union, with 73,718 stars; grpc-rust has 12,537.

The proof: [unionlabs/union on GitHub](https://github.com/unionlabs/union)

### Which has more tests, grpc-rust or union?

union, with 120 test files; grpc-rust has 83.

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

### Which was updated more recently, grpc-rust or union?

grpc-rust: its last push was on November 11, 2026, and union's on July 25, 2026.

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

### Which has more commits signed by AI, grpc-rust or union?

grpc-rust: an AI signed 0.1% of its commits, with Cursor.

## Sources

- grpc/grpc-rust: Read on November 11, 2026, at commit 18ce109 (https://github.com/grpc/grpc-rust/tree/18ce109737986c821d1f9623eaa5c19d5b6436aa)
- unionlabs/union: Read on November 9, 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.