Best Model Monitoring Software in 2026
Updated
In short: Arize AX is ranked #1 of 24 as of 2 October 2026, ahead of W&B Weave and Langfuse. The best-ranked option with a free plan is W&B Weave. The lowest first paid tier on this page is SUPERWISE at $10/mo.
24 model monitoring software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
| # | Platform | Score | Why | From | Free plan | Paid from | Drift detection | |
|---|---|---|---|---|---|---|---|---|
| 1 |  Arize AX | 8.9 | RecognisedAPIDocumented | $50/mo | Yes | 50 /mo | — | View |
| 2 | W&B Weave | 8.8 | RecognisedAPIDocumented | $60/mo | Yes | 60 /mo | — | View |
| 3 | Langfuse | 8.7 | RecognisedAPIDocumented | $29/mo | Yes | 29 /mo | — | View |
| 4 | Opik | 8.6 | RecognisedAPIDocumented | $19/mo | Yes | 19 /mo | — | View |
| 5 | Helicone | 8.3 | RecognisedAPIDocumented | $79/mo | Yes | 79 /mo | — | View |
| 6 |  OpenLIT | 8.1 | RecognisedAPIDocumented | Free | Yes | — | — | View |
| 7 | Evidently AI | 8.1 | RecognisedAPIDocumented | $80/mo | Yes | — | — | View |
| 8 | Braintrust | 8.0 | RecognisedAPIDocumented | $249/mo | Yes | 249 /mo | — | View |
| 9 | Galileo | 7.9 | RecognisedAPIDocumented | $100/mo | Yes | 100 /mo | — | View |
| 10 | Maxim AI | 7.9 | RecognisedAPIDocumented | $29/mo | Yes | — | — | View |
| 11 | Arthur | 7.5 | RecognisedAPIDocumented | $60/mo | Yes | 60 /mo | — | View |
| 12 | Deepchecks | 7.4 | RecognisedAPIDocumented | Free | Yes | — | — | View |
| 13 | NannyML | 7.3 | RecognisedAPIDocumented | $399/mo | Yes | 99 /mo | — | View |
| 14 |  Qualdo-MQX | 7.3 | RecognisedAPIDocumented | $79/mo | Yes | 88 /mo | Yes | View |
| 15 | SUPERWISE | 6.8 | RecognisedAPIDocumented | $10/mo | No | 10 /mo | — | View |
| 16 |  Arize Phoenix | 6.7 | RecognisedAPIDocumented | — | Yes | — | — | View |
| 17 | LangSmith | 6.6 | RecognisedAPIDocumented | — | Yes | — | — | View |
| 18 | HoneyHive | 6.4 | RecognisedAPIDocumented | — | Yes | — | — | View |
| 19 | LangWatch | 6.3 | RecognisedAPIDocumented | — | Yes | — | — | View |
| 20 | Laminar | 5.9 | RecognisedAPIDocumented | $30/mo | Yes | 30 /mo | — | View |
| 21 | Fiddler AI | 5.7 | RecognisedAPIDocumented | — | Yes | — | — | View |
| 22 |  Memoturn | 5.2 | RecognisedAPIDocumented | — | — | — | — | View |
| 23 |  Lunary | 4.4 | RecognisedAPIDocumented | — | No | — | — | View |
| 24 |  Pulsar | 4.3 | RecognisedAPIDocumented | — | — | — | — | View |
Is your platform on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which model monitoring software is ranked first on Inferse?
Arize AX is ranked #1 of 24 with a score of 8.9. W&B Weave is second and Langfuse third.
How many of these have a free plan?
12 of the 24 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, SUPERWISE has the lowest first paid tier we found: $10/mo.
How is this list ranked?
Ranked on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it. Paid placements never change a rank.