Best Neptune.ai Alternatives with Free Tiers (2026)
2 free alternatives in AI / ML. Sorted by pricing stability.
Current Neptune.ai Situation
Risk Level:source unconfirmed
Why: Neptune.ai was discontinued on 2026-03-05, so it is not a current option. We do not rate an offer we do not list. We are not publishing a stability judgement for it until that is fixed.
Neptune shut down its hosted app and API on March 5, 2026, after agreeing to be acquired by OpenAI; new sign-ups and trials had closed on December 3, 2025. Source ↗
Recommended Migration Targets
These alternatives were identified from Neptune.ai’s pricing changes as recommended replacements.
Comet makes Opik, for LLM and agent observability and evaluation, and an MLOps platform for ML experiment tracking. Opik is open source and free to self-host.
2 of these carry no recorded demerit and are indistinguishable under every signal we hold; their order rotates daily. 0 are demoted with the reason named, and 0 are listed last because they are not generally available or are not a free offer. How we rank.
Comet makes Opik, for LLM and agent observability and evaluation, and an MLOps platform for ML experiment tracking. Opik is open source and free to self-host.
Recompute today's order yourself. The order above is a permutation seeded only on the UTC date and the query key — no vendor name, slug, id or offer field is an input. The algorithm is published, so anyone can reproduce this page's order without asking us.
What are the best free alternatives to Neptune.ai?
We publish no ranking of these. Nothing we record measures popularity or generosity, so naming a best or a top few would be our preference rather than our data. We hold 2 free alternatives to Neptune.ai, each listed below with its tier, category and the read and catalogue dates we hold. Of those, 2 carry no recorded demerit and are indistinguishable under every signal we hold, so they are listed in an order that rotates daily. Our ranking rule is published at /criteria.
Is Neptune.ai's free tier still available?
We cannot confirm that today. The page we cite for Neptune.ai states no amount, tier or rate we can read when we last looked, on 2026-10-20. Our stored record says Neptune.ai offers a free tier (Free (Individual)), but we have not confirmed those terms against the source we cite.
How many free alternatives to Neptune.ai exist?
There are 2 free alternatives to Neptune.ai tracked on AgentDeals across the AI / ML category.
Has Neptune.ai changed their pricing?
Neptune.ai has 1 recorded pricing change. The most recent was on 2025-12-03: Neptune shut down its hosted app and API on March 5, 2026, after agreeing to be acquired by OpenAI; new sign-ups and trials had closed on December 3, 2025. Source: https://docs.neptune.ai/transition_hub