Clay
Weights & Biases
| Feature | Clay | Weights & Biases |
|---|---|---|
| Pricing | Free / from $149/mo | Free / from $50/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.6 / 5 | 4.7 / 5 |
| Best For | sales-teams, growth-teams, agencies, outbound-heavy-companies | ml-engineers, research-teams, ai-companies, data-scientists |
| Founded | 2017 | 2017 |
| Data Enrichment | ✓ | ✗ |
| Ai Research | ✓ | ✗ |
| Waterfall Enrichment | ✓ | ✗ |
| Outreach Personalization | ✓ | ✗ |
| Crm Integration | ✓ | ✗ |
| List Building | ✓ | ✗ |
| Ai Messaging | ✓ | ✗ |
| Experiment Tracking | ✗ | ✓ |
| Model Registry | ✗ | ✓ |
| Sweeps | ✗ | ✓ |
| Artifacts | ✗ | ✓ |
| Reports | ✗ | ✓ |
| Launch | ✗ | ✓ |
✓ Clay Pros
- Aggregates 75+ data sources in one waterfall enrichment
- AI research agent writes personalized outreach copy
- Flexible spreadsheet-like interface for data manipulation
- Integrates with all major CRMs and sequencing tools
✗ Clay Cons
- Expensive for small teams (starter at $149/mo)
- Learning curve for advanced data workflows
- Credit system can be confusing to predict costs
✓ Weights & Biases Pros
- Best-in-class experiment tracking
- Beautiful visualizations
- Great collaboration features
- Generous free tier
✗ Weights & Biases Cons
- Learning curve for full platform
- Can be expensive for large teams
- Requires integration work
The Verdict
Clay is built for sales teams and growth teams, with a focus on data-enrichment and ai-research. Weights & Biases targets ml engineers and research teams and leads with experiment-tracking and model-registry.
On pricing, Weights & Biases is the clear winner for budget-conscious users — starting at $50/mo compared to $149/mo for Clay. That $99/mo difference adds up quickly for growing teams.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
Feature-wise, Clay offers broader built-in capabilities (7 features vs 6), while Weights & Biases takes a more focused approach — which can mean a simpler, faster onboarding experience.
This is a genuinely close comparison. If you can, sign up for both free trials (where available) and run a one-week test with your actual team tasks before deciding.