Fulcra vs AI21
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
Fulcra compared with AI21
| Detail | F
Fulcra | 
AI21 |
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| What it does | The user-owned context backend for AI agents
| Post-train specialized models for your task, creating an AI edge your competitors can't buy
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| Stage | Growing
| Established
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| Founded | Not given
| Not given
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| Based in | US
| IL
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| Pricing model | Freemium
| Contact for pricing
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| Pricing | Not given
| Not given
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| Key features | - One user-owned context for every agent
- Agents wake up to what changed since their last loop
- Readable, traceable context with every change logged
- End-to-end encryption with AES-256
- Granular sharing controls with revocable access
- Right to export, delete, and transparency
- Context that travels across AI products and models
| - Forward-Deployed Researchers provide end-to-end model training and optimization
- Custom evaluation suite development from real tasks
- Production-ready deployment with cost-quality trade-offs
- Deployment flexibility including on-premises and VPC options
- Data security with no retention and full traceability
- Continuous model improvement from production traffic
- Customer ownership of model weights and training recipes
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| What makes it different | - User-owned context that travels with you across AI products
- Traceable agent activity with full visibility and control
- Agents coordinate through shared context without learning being trapped in silos
- End-to-end encryption with no data selling
| - Customers own specialized models trained on proprietary data, not rented general-purpose models
- Achieve frontier-level quality at lower costs through specialized training
- Five years of experience with diverse post-training and optimization methods
- Models ship production-ready in weeks with ongoing improvement capability
- Secure deployment with no data retention and auditable access controls
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| Free plan | Not given
| Not given
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| Open source | Not given
| Not given
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| Platforms | Not given
| Not given
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| Public API | Not given
| Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 37 ▲ +3 (up) since last check | 75 ● no change since last check |
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| Trust Flow (Majestic) | 20 | 22 |
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| Citation Flow (Majestic) | 40 | 44 |
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| Referring domains (Majestic) | 593 | 3529 |
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6 details filled in for both companies.
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