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iii vs union

iii and union share 11 technologies: axum, tower, SQLite, Tokio, console, schemars, tracing, OpenTelemetry, tracing-subscriber, tracing-opentelemetry, and opentelemetry-otlp. Both are written in Rust.

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What they share and what sets them apart

iii-hq

iii

Effortlessly compose, extend, and observe every service in real-time for the first time ever.

Rust18.9kRead on November 6, 2026, at commit 4094bb4 What is iii built with?

Only in iii

React
rusqlite
lapin
Redis
indicatif
cliclack
zip
Pydantic
jsonschema
github.com/invopop/jsonschema
opentelemetry-api
go.opentelemetry.io/otel
go.opentelemetry.io/otel/trace
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-http

In common

unionlabs

union

The trust-minimized, zero-knowledge bridging protocol, designed for censorship resistance, extremely high security, and usage in decentralized finance.

Rust73.7kRead on November 5, 2026, at commit 031785b What is union built with?

Only in union

net/http
Gorilla
sqlx-postgres
Postgres
moka
sqlx
wasmtime
Svelte
SvelteKit
Supabase
@effect/platform
Ratatui
crossterm
ed25519-dalek
github.com/rs/zerolog
Tailwind CSS
tailwind-merge
rehype-stringify
remark
remark-parse
unified
vfile
@effect/opentelemetry

Side by side

iiiunion

SizeLines written by people and agents, without generated ones; code files, without tests.

iii523,734 lines written690 code files

union468,416 lines written1,841 code files

Who writes itA commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.

iii4.9% of its commits signed by AIWith Claude Code, CodeRabbit, Cursor, and GitHub Copilot

union0% of its commits signed by AIWith CodeRabbit

ActivityFrom GitHub and its history, on the day SeeRepo read it.

iiiLast push November 6, 20262,181 commits18,926 stars

unionLast push July 25, 202613,299 commits73,725 stars

TestsThe files that test the code, and the share of code files a test imports.

iii452 test files21.4% of its code files have a test that imports them

union120 test files10.4% of its code files have a test that imports them

Frequently asked questions

Which is bigger, iii or union?

iii, with 523,734 lines written; union has 468,416.

The proof: iii-hq/iii's code at commit 4094bb4

Which has more GitHub stars, iii or union?

union, with 73,725 stars; iii has 18,926.

The proof: unionlabs/union on GitHub

Which has more tests, iii or union?

iii, with 452 test files; union has 120.

The proof: iii-hq/iii's code at commit 4094bb4

Which was updated more recently, iii or union?

iii: its last push was on November 6, 2026, and union's on July 25, 2026.

The proof: iii-hq/iii's commits on GitHub

Which has more commits signed by AI, iii or union?

iii: an AI signed 4.9% of its commits, with Claude Code, CodeRabbit, Cursor, and GitHub Copilot.

The proof: the commits each tool signed in iii-hq/iii

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