Your AI works.
Can you prove it?
Fact0 records who did what, when, and what happened - in a log that can't be quietly edited. Install in minutes. Export evidence when procurement asks.
Every action logged
Who acted, what they touched, and whether it succeeded or failed.
Tamper-evident records
If someone changes history, the chain breaks - and you'll know.
Evidence on demand
Filter, export PDF, or send a read-only link to auditors.
Won't slow your agents
Async batching - your app keeps running even if we're down.
pip install fact0
client = fact0.Client(api_key="f0_live_...")
client.audit.log(
actor={"id": "agent-1", "type": "agent"},
action="invoice.approve",
resource={"id": "inv_42", "type": "invoice"},
outcome="success",
)Every log gets a permanent place in the chain.
Scroll to load demo
Interactive demo with sample data -click around audit logs, executions, and replays.
Built for teams selling AI to enterprises
Close enterprise deals faster
Send prospects a read-only audit view and a one-click evidence pack - no more scrambling for screenshots during security review.
- Download an evidence pack (PDF + verification + control mapping)
- Share a time-limited link with your prospect's security team
- Answer questionnaire items with live, verifiable data
Founders preview
Dashboard screenshot - close enterprise deals faster
Sound familiar?
"Please provide a complete audit trail of all actions taken by your AI system within our environment - including actor identity, timestamp, action type, resource affected, and outcome - with cryptographic proof that the records have not been modified."
Deal stalls
Security sends a 200-questionnaire. You scramble for screenshots. Months pass.
You lose to "compliance"
The other vendor sends a PDF audit report. You send a Google Sheet.
You build it yourself
Six months later you still fail the first review - and maintenance never ends.
From install to proof in three steps.
Log
Add our SDK to your agent or backend. Important actions are recorded with actor, resource, and outcome.
# Install the SDKpip install auditlog-sdk
# Initialize & logclient = auditlog.Client(api_key="f0_live_...") client.log( actor=..., action="doc.delete", resource=..., outcome="success")Lock
Each event links to the one before it. Change any record and the chain shows it. Under the hood we use SHA-256 - your auditor gets math, not trust.
Prove
Export a PDF or evidence pack. Share a read-only link. Auditors verify integrity without needing your database.
AI accountability for regulated and high-stakes work
Fintech
Loan & payment agents
Prove every approval, rejection, and override - for regulators and internal audit.
Healthcare
Clinical & admin assistants
Track access to patient data with actor identity and outcome.
Support
Autonomous support bots
Show exactly what the bot changed, refunded, or escalated.
Legal / HR
Document workflows
Audit trail for deletes, shares, and AI-generated summaries.
Built for the security review, not just the demo.
Enterprise buyers don't care how clever your agent is. They care whether you can show a complete, trustworthy history of what it did in their environment.
See the full story behind every agent run
Beyond compliance, Fact0 traces agent runs as interactive timelines - replay, debug, and explain odd behavior to customers.
Execution DAG
Visualize every step an agent took - tools, decisions, and branches.
Replay & debug
Rewind to the exact state when something went wrong.
Live activity feed
Watch audit events stream in as your agents run.
Controls your security team already asks about
Who accessed what, when, with what result - and proof the log wasn't altered.
| STANDARD | CONTROL | HOW IT'S SATISFIED |
|---|---|---|
| SOC 2 | CC6.8 - Logical access | Actor identity logged for every agent action |
| SOC 2 | CC7.2 - System monitoring | Continuous append-only log of all agent activity |
| SOC 2 | CC9.2 - Vendor risk | All third-party agent actions are attributable |
| HIPAA | §164.312(b) - Audit controls | Hardware, software, and procedural access tracking |
| FINRA | 17a-4 - Records retention | Coming Q3 2026 |
Fact0 is completing its own SOC 2 Type II audit in Q3 2026. Security posture available on request.
Trusted by AI builders
Fact0 is trusted by the world's leading engineering teams to build, observe, and debug highly capable autonomous agents.
Fact0 completely changed how we trace complex multi-agent reasoning loops. We finally have observability.
The visual DAG debugger saved us weeks of guessing what our prompt chains were actually executing in production.
Having cryptographically provable audit logs for every action our autonomous agent takes is a game changer for compliance.
With Fact0's Human-in-the-Loop features, we can securely pause automated workflows for manual review.
Fact0 completely changed how we trace complex multi-agent reasoning loops. We finally have observability.
The visual DAG debugger saved us weeks of guessing what our prompt chains were actually executing in production.
Having cryptographically provable audit logs for every action our autonomous agent takes is a game changer for compliance.
With Fact0's Human-in-the-Loop features, we can securely pause automated workflows for manual review.
Start free. Scale when you're ready.
50,000 audit events per month on the free tier. No credit card. Enterprise when you need unlimited volume, retention, and SLAs.
Free
Everything you need to instrument agents and pass your first security review.
Custom
Unlimited events, custom retention, SSO, and dedicated support for regulated teams.
Got Questions?
If you can't find what you're looking for, get in touch.