Opik vs Phoenix
A data-driven comparison of two Machine learning visualization tools: popularity, development activity, licensing and installation. Updated .
Key differences
- Opik has 1.9× as many GitHub stars as Phoenix (22.4K vs 11.7K).
- Opik had more development activity over the last 12 months: 4,323 commits vs 3,725.
- Opik is downloaded 2.9× as often on PyPI (424.8K vs 145.1K per week).
- Opik is licensed under Apache-2.0; Phoenix under Elastic-2.0.
By the numbers
- Opik
- Phoenix
Show data as a table
| Metric | Opik | Phoenix |
|---|---|---|
| GitHub stars | 22,373 | 11,704 |
| PyPI downloads / week | 424,803 | 145,091 |
| Commits, last 12 months | 4,323 | 3,725 |
| Contributors | 159 | 235 |
| Forks | 1,841 | 1,181 |
Development activity
Commits per month to each default branch, last 12 complete months.
- Opik
- Phoenix
Show data as a table
| Month | Opik | Phoenix |
|---|---|---|
| Oct 2025 | 409 | 235 |
| Nov 2025 | 388 | 198 |
| Dec 2025 | 289 | 156 |
| Jan 2026 | 329 | 158 |
| Feb 2026 | 308 | 587 |
| Mar 2026 | 454 | 328 |
| Apr 2026 | 496 | 289 |
| May 2026 | 297 | 287 |
| Jun 2026 | 302 | 252 |
| Jul 2026 | 343 | 463 |
| Aug 2026 | 295 | 417 |
| Sep 2026 | 413 | 355 |
Side by side
| Attribute | Opik | Phoenix |
|---|---|---|
| Description | Formerly CometLLM. Debug, evaluate, and monitor LLM applications with tracing and dashboards. | ML observability in a notebook with UMAP visualizations |
| Category | Machine learning visualization tools | Machine learning visualization tools |
| License | Apache-2.0 | Elastic-2.0 |
| Language | Python | Python |
| Status | Active | Active |
| Latest release | 2.2.88 () | arize-phoenix-v20.19.0 () |
| Last commit | ||
| Repository created | ||
| Open issues | 80 | 946 |
| Install | pip install opik | pip install arize-phoenix |
Which should you choose?
Popularity and activity are only part of the story. Consider which ecosystem you work in, the chart types and interactions you need, how much data you render, and whether the license fits your project. Both tool pages list alternatives if neither is quite right.