4.9/5
G2 rating
26 reviews (W&B Models)
Report
Should I Use W&B (Weights & Biases)?
Weights & Biases, developer tools for machine learning
Depends
DependsBuy if you run serious ML training or LLM app workloads — it's the category default with deep tracking and eval features.
Industry-standard ML experiment tracking; buy for serious AI teams, skip for casual projects — pricing gets rigid fast.
Confidence: Medium
~$60/mo
Starting price
per seat, paid tiers
Yes
Free tier
freemium plan available
$250M
Total funding
across five rounds
Value for money
3
Users call pricing rigid; usage billing compounds
Ease of use
4
4.9/5 G2; praised intuitive UI
Feature depth
5
End-to-end: tracking, evals, inference, artifacts
Security posture
3
One high-severity CVE in Weave server
Pros
Cons
Gotchas
- highTracked-run caps (~500) on lower tiers push teams into paid plans quickly⁵
- highSelf-hosted Weave server had CVE-2024-7340, high-severity arbitrary file read; patch before deploying⁸
- mediumWeave data ingestion, W&B Inference, and storage are billed by usage — costs surprise at scale¹
- mediumGuess: deep SDK instrumentation creates lock-in; migrating to MLflow or Braintrust means code rewrites⁵
Best for
- ML teams tracking training runs
- LLM app teams needing eval + tracing
- Research labs comparing many experiments
- AI startups scaling up (credits program)
Not for
- Casual users logging a handful of runs
- Teams wanting free self-hosted tracking — use MLflow
- Non-engineers; requires SDK code integration
- Cost-sensitive buyers — seats plus usage billing compound
Companies that use it
- Canva
- Harvard Kempner Institute
- Earthmover
Pricing
Free
$0
- Individual experiment tracking
- Limited tracked runs
Team / Pro
~$60/mo per seat
- Usage-based Weave ingestion and storage
- Collaboration features
Enterprise
Not disclosed
- Self-hosting, SSO, security controls
Security
One high-severity 2024 CVE affected the self-hosted Weave server; the managed cloud service was not implicated.
- CVE-2024-7340 — W&B Weave Server arbitrary file readRemote arbitrary file leak via path traversal in the self-hosted Weave server; rated high severity (JFSA-2024-00103924).⁸
What users say
Users love the tracking UX but increasingly gripe about rigid pricing, run limits, and enterprise growing pains.
“W&B pricing model is very rigid.”
“Over the six months or so, my team has had problems”
“I've been evaluating Weights and Biases recently”
Alternatives
Compare W&B (Weights & Biases) with each alternative.
MLflow
Free, open-source, self-hosted experiment tracking; less polished UI
Braintrust
Purpose-built LLM evaluation; reviewers rank it above W&B Weave
W&B (Weights & Biases) vs BraintrustLangfuse
Open-source LLM observability and tracing, self-hostable
Arize AI
AI observability alternative; ~$60/month for W&B ecosystem teams
W&B (Weights & Biases) vs Arize AIFull analysis
Based on ~15 public sources; unrelated 'W&B' aviation and service businesses excluded from analysis.
Sources
official
- W&B Weave Reviews — Gartner Peer Insightsgartner.comreview
review
review
review
- Weights & Biases Pricing vs Self-Hosted MLflowspheron.networknews
- W&B Weave server remote arbitrary file leak — JFrogresearch.jfrog.comsecurity
news
- Prototype to production: W&B and ClickHouseclickhouse.comnews
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