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Machine Learning · head to head

Neptune.ai vs OpenRouter

Neptune.ai logo

Neptune.ai

Machine Learning

Metadata store for MLOps

From
Free
Rated
-
Full reviewWebsite
OpenRouter logo

OpenRouter

Machine Learning

Unified API gateway routing requests across 500+ models from 80+ providers

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Neptune.ai free tier limited to 100 hours per month, exhausted quickly with serious ML work; OpenRouter no free tier; all usage incurs cost
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Neptune.ai and OpenRouter actually diverge.

Attributes where Neptune.ai and OpenRouter differ
AttributeNeptune.aiOpenRouter
Pricing modelUnknownusage-based
PlatformsWeb, Self-hostedAPI, Web
Founded2017Unknown

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Machine Learning).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Neptune.ai

  • Experiment tracking
  • Model registry
  • Metadata logging
  • Comparison views
  • Custom dashboards
  • PyTorch
  • TensorFlow
  • Keras

Only in OpenRouter

Nothing recorded that Neptune.ai does not also cover.

What people use each for

The jobs each tool is most often brought in to do.

Neptune.ai

  • Machine learningnot OpenRouter
  • Data analysisnot OpenRouter
  • Model trainingnot OpenRouter
  • Predictive analyticsnot OpenRouter

OpenRouter

  • Multi-model applications optimising for cost or performancenot Neptune.ai
  • Provider-agnostic deployments avoiding vendor lock-innot Neptune.ai
  • Enterprise applications with custom data policies and provider requirementsnot Neptune.ai
  • Development workflows testing multiple models without code changesnot Neptune.ai

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Neptune.ai

  • Free tier limited to 100 hours per month, exhausted quickly with serious ML work
  • Lacks hyperparameter sweeps compared to Weights and Biases
  • No pipeline orchestration or broader MLOps lifecycle management
  • Dashboard visualization limitations - automatic resizing affects visualization order and size
  • Cloud-based SaaS only (as of last available service) requires internet connectivity

OpenRouter

  • No free tier; all usage incurs cost
  • Pricing varies by model; specific rates not published on main site without account access
  • Adds latency through additional routing layer compared to direct provider APIs
  • Dependent on upstream provider uptime and API compatibility

Pricing, plan by plan

Neptune.ai

Free

No published plan breakdown. See the Neptune.ai review.

OpenRouter

Free
  • FreeFree
    • 50 requests per day
    • Access to 25+ free models across 4 providers
    • Community support
  • Pay-as-you-go$null/variable
    • 5.5% platform fee on inference costs
    • Access to 500+ models across 80+ providers
    • Email support
  • Enterprise$null/custom
    • Negotiable platform fees
    • 200,000 USD of list price inference per month with no fees, then 5% fee after
    • SSO/SAML support

Which should you pick?

Choose Neptune.ai if

  • You need experiment tracking.
  • You want to start without paying.
  • You work on Web, Self-hosted.
  • You also want model registry.
Neptune.ai review

Choose OpenRouter if

  • You want to start without paying.
  • You work on API, Web.
OpenRouter review

Questions people ask

Is Neptune.ai or OpenRouter better?
Neither clearly leads. Neptune.ai starts at Free and OpenRouter at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Neptune.ai or OpenRouter?
Neptune.ai starts at Free and OpenRouter at Free.
Does Neptune.ai or OpenRouter run on more platforms?
Neptune.ai runs on Web, Self-hosted. OpenRouter runs on API, Web.
Can I use Neptune.ai for free?
Both have a free tier, so you can try either at no cost before committing.
What is Neptune.ai best used for?
Neptune.ai is most often used for machine learning, data analysis, model training, predictive analytics. Of those, machine learning and data analysis are not what OpenRouter is typically brought in for.
What can Neptune.ai do that OpenRouter cannot?
Neptune.ai covers Experiment tracking, Model registry, Metadata logging, Comparison views.

Answered from the vendors’ own pages

Neptune.ai: Does Neptune.ai support self-hosting?

Yes. Neptune can be self-hosted on a Kubernetes cluster with ClickHouse, MySQL, and Redis dependencies, allowing organizations to maintain full data control.

Source
OpenRouter: How much does OpenRouter charge?

OpenRouter charges a 5.5% platform fee on top of the actual inference costs from selected models. Customers purchase credits on a pay-as-you-go basis with no subscriptions or minimum spend requirements.

Source
Neptune.ai: What machine learning frameworks does Neptune integrate with?

Neptune integrates with PyTorch, TensorFlow, Keras, scikit-learn, XGBoost, LightGBM, Hugging Face Transformers, and Optuna for hyperparameter optimization.

Source
OpenRouter: Is there a free tier?

Yes. OpenRouter offers a free tier with 50 requests per day and access to 25+ free models across 4 providers. The free tier provides community support only.

Source
Neptune.ai: What is the cost for a team of 10 data scientists?

Neptune's Team plan costs $49 per user per month, resulting in $490/month for 10 users, comparable to Weights and Biases at $50/user.

Source
OpenRouter: What does the Enterprise plan include?

The Enterprise plan includes 200,000 USD of list price inference per month at no cost, with a 5% platform fee applied to usage above that threshold. It also includes SSO/SAML support, contractual SLAs, and dedicated support with a shared Slack channel.

Source
Neptune.ai: When is Neptune.ai shutting down?

Neptune.ai is shutting down its external SaaS service on March 5, 2026, following its acquisition by OpenAI in December 2025. Customers must export and migrate data before that date.

Source
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