Open source
$0 / forever
Full local CLI for export, serve, replay, tracing, safety checks, and evidence generation.
Best for individual developers, labs, and teams proving feasibility on their own hardware.
Pricing
Tether’s local engine stays source-available under BSL 1.1 and free for personal, academic, and commercial use that does not compete with FastCrest’s hosted offering.
Paid FastCrest products are for teams that need repeatable deployment proof: hosted GPU verification, signed proof packets, compliance evidence, rollout receipts, and enterprise support.
Hosted proof job
$99 small / $249 large
FastCrest runs export + verify on hosted GPUs and returns a signed proof packet.
Includes:
- Real export and parity verification
- Latency receipt and deployment notes
- Signed
parity.cert.json+PARITY.md - Proof artifacts retained for 90 days
Team proof plan
$499 / month
For teams iterating on robot policies and needing repeated proof runs.
Includes:
- 10 hosted proof jobs per month
- Priority queue
- Saved proof history
- Compliance workspace add-on access
- Email support
Enterprise
Custom
For regulated, audit-heavy, or fleet-scale deployments.
- On-prem deployment (no HF Hub dependency)
- SSO (SAML / OIDC)
- Dedicated support engineer
- SLAs on response time and proof turnaround
- Custom embodiments and deployment gates
- Continuous self-distillation or training-loop integration
Contact us — typically responds in 1-2 business days.
Detailed comparison
Section titled “Detailed comparison”| Capability | Open source | Hosted proof job | Team proof plan | Enterprise |
|---|---|---|---|---|
tether go / tether serve | yes | artifact input | artifact input | yes |
| Local export + replay | yes | optional input | yes | yes |
| Hosted GPU verification | — | one job | 10 jobs/month | custom capacity |
| Signed parity certificate | local only | yes | yes | yes |
| Latency receipt / deployment notes | local only | yes | yes | yes |
| Proof history | local files | 90-day retention | saved workspace | custom retention |
| Compliance workspace add-on | — | optional | available | included/custom |
| Continuous self-distillation | manual | — | design partner | custom |
| Support | community | priority email | dedicated channel | |
| License | BSL 1.1 | service terms | service terms | negotiated |
What’s Not Free
Section titled “What’s Not Free”- Hosted GPU verification run by FastCrest
- Long-term artifact retention beyond the included job window
- Compliance workspace collaboration
- Enterprise SLAs, on-prem packaging, and custom deployment gates
- Hardware, unless separately contracted
Deployment Proof Sprints
Section titled “Deployment Proof Sprints”For teams that want help getting the first proof run working, FastCrest can run a fixed-scope deployment proof sprint.
Typical sprint inputs:
- Model family or checkpoint
- Target hardware
- Replay/session data
- Latency budget
- Safety guard config or robot limits
- Pass/hold criteria
Typical sprint output:
- Proof packet
- Latency and deadline-miss receipt
- Export/parity certificate
- Deployment blockers
- Recommended next actions
Who buys what
Section titled “Who buys what”- Hobbyists / students / hackathon teams — Open source. Always.
- Academic labs publishing on VLAs — Open source for experiments; hosted proof jobs for reproducible deployment artifacts.
- Robotics startups (5-50 people) — Team proof plan once policy updates need repeatable release evidence.
- Robotics OEMs / integrators (50+ people) — Enterprise for custom gates, on-prem, retention, and SLAs.
How to upgrade
Section titled “How to upgrade”Use the hosted Cloud flow for proof jobs, or contact FastCrest for a proof sprint, team workspace, or enterprise deployment.