5 Opik Alternatives Worth Switching To in 2026

Opik is a genuinely good deal. It is Comet’s open-source observability and eval platform, and it wins on three facts at once - the most permissive OSS license in the category, the cheapest managed cloud, and the fastest growth of its peers. The Apache-2.0 build self-hosts with the full feature set, unlimited spans and members, no gates. The Pro cloud is $19/mo for 100k spans. Per the vendor it sits at roughly 20.8k GitHub stars, up from zero to 12.5k in about eight months.

So this is not a “leave Opik” list. It is an honest one. Opik’s real weakness is per-seat pricing at scale - the $19 headline is the small-team configuration, and the recurring complaint is that seat costs add up as your team grows. Two smaller ones round it out: a few users report UI slowdown on very large projects, and Opik treats OpenTelemetry as one ingestion path rather than the native architecture. Each of those pushes a specific buyer toward a specific alternative. I have matched them below.

The short version

Tool	Best for	Starting price	Self-host	License
Opik	Cheapest managed cloud, permissive OSS	Free / $19/mo	Free, no gates	Apache-2.0
Langfuse	Cheapest at high trace volume, MIT	Free / $29/mo	Free, full-featured	MIT
Braintrust	Turnkey evals and CI regression gates	Free / $249/mo	Hybrid, Enterprise	SDKs open, backend closed
Arize Phoenix	Deepest RAG eval, OTel-native	Free	Free, runs locally	ELv2 server
Helicone	Nobody new - it is frozen	Free / $79/mo	Free, Apache-2.0, frozen	Apache-2.0

If you left because per-seat pricing bit at scale: Langfuse

This is the main reason people look, so it goes first. Opik’s cloud is priced per seat, and past a certain team size that stops being the cheap option. Langfuse is priced on usage, not heads - the Core plan is $29/mo for unlimited users, and self-hosting removes the per-trace cost entirely. At 1M events a month Langfuse runs about $101/mo managed, and its MIT license is genuinely OSI-approved open source - only three features are enterprise-gated in the self-host build. For a large team, that shape beats Opik’s seat meter.

The catch is operational, not commercial. Langfuse v3 needs Postgres plus ClickHouse, Redis and S3-compatible storage. That is four services to stand up, and GitHub has a visible string of threads where the migration to that architecture gets stuck on memory errors and timeouts. The software is free. The ops time is not. One more fact to file: Langfuse was acquired by ClickHouse in January 2026, per the vendor, with the MIT license and self-host preserved. If you cannot run four services, the $29 Core tier sidesteps the whole thing.

If evals and CI regression gates are the real point: Braintrust

Some teams are on Opik for the eval side, not the tracing. If your center of gravity is “did this change make the model worse, and can I block the merge,” Braintrust is more turnkey out of the box. Its autoevals library ships working scorers, and its CI/CD quality gates can block a merge on a statistically significant regression - not just log that quality dropped. Human review, automated scorers, tracing and datasets share one system. And unlike Opik, there is no per-seat charge at all - users are unlimited on every tier, which is the exact thing that pushed you off Opik.

The gotcha is the billing meter. Braintrust bills “processed data” in GB, counting every byte of inputs, outputs, prompts and metadata, and there is no hard spending cap. The $0 Starter jumps straight to $249/mo with nothing in between. Verbose multi-step agents and large RAG contexts - the workloads that most need observability - burn the allowance fastest. Set billing alerts on day one, or the $249 plan will not stay $249.

If you need the deepest RAG eval or strict OTel-native: Arize Phoenix

Opik’s OTel support is one ingestion path, not the architecture. If you are standardizing strictly on OpenTelemetry, or your bottleneck is retrieval quality, Arize Phoenix is the sharper tool. It is genuinely OTel-native, built on OpenTelemetry and Arize’s own OpenInference conventions, and its 50-plus pre-built eval metrics include what reviewers call the best RAG evaluation in the category. It also runs locally with a working trace UI in under a minute. Arize the company is well-funded - a $70M Series C in February 2025, per press reports - so it is not going anywhere.

The gotcha is the license, and it is a real one. The main server repo is Elastic License 2.0 - source-available, not OSI-approved open source. Only the client and eval subpackages are Apache-2.0. ELv2 forbids offering Phoenix as a hosted service to third parties. For internal use it behaves like open source and the features are not gated. But if Opik’s Apache-2.0 was part of the appeal, know that Phoenix’s server is a step less permissive, not more.

If someone points you at Helicone: don’t

You will see Helicone recommended in old threads as a lightweight proxy-based alternative. Ignore that advice for a new build. Mintlify acquired Helicone on 3 March 2026, per the vendor, and put it in maintenance mode - security patches, bug fixes and new-model support only, no roadmap, and Mintlify is actively helping customers migrate off.

For a new buyer that single fact overrides everything else. The Apache-2.0 self-host still works, but self-hosting a frozen codebase whose own owner is pointing people to the exit is a weak bet. The proxy model was also a structural single point of failure - if Helicone is down, your LLM calls fail even when the provider is healthy. Opik is the better tool on every axis that matters here. This entry exists only to save you the detour.

So which one?

• You are a small team and price is the whole question - stay on Opik. The $19/mo Pro tier is the cheapest managed cloud here, and the Apache-2.0 self-host has no gates. You may already be on the best option.
• Your team got big and the seat meter hurts - Langfuse, self-hosted if you can run four services, or the $29 Core cloud if you cannot.
• Evals and CI regression gates are the priority - Braintrust, with billing alerts on from day one.
• You need the best RAG eval or strict OTel-native architecture - Arize Phoenix, as long as you are not reselling it.
• You saw Helicone recommended - skip it. It is frozen.

One honest note on the numbers. Every price above is from each vendor’s own pages, verified on 26 July 2026, and this category ships breaking changes monthly - we re-verify every 30 days. Opik earns its reputation. The only reason to leave is one of the specific mismatches above, and each of those has a clean answer.