diff --git a/docs/advanced/configuration.mdx b/docs/advanced/configuration.mdx
index a40b9fc..27fba22 100644
--- a/docs/advanced/configuration.mdx
+++ b/docs/advanced/configuration.mdx
@@ -42,15 +42,7 @@ Configure Strix using environment variables or a config file.
 </ParamField>
 
 <ParamField path="STRIX_TELEMETRY" default="1" type="string">
-  Global telemetry default toggle. Set to `0`, `false`, `no`, or `off` to disable both PostHog and OTEL unless overridden by per-channel flags below.
-</ParamField>
-
-<ParamField path="STRIX_OTEL_TELEMETRY" type="string">
-  Enable/disable OpenTelemetry run observability independently. When unset, falls back to `STRIX_TELEMETRY`.
-</ParamField>
-
-<ParamField path="STRIX_POSTHOG_TELEMETRY" type="string">
-  Enable/disable PostHog product telemetry independently. When unset, falls back to `STRIX_TELEMETRY`.
+  Telemetry toggle. Set to `0`, `false`, `no`, or `off` to disable telemetry (PostHog, Scarf, OTEL).
 </ParamField>
 
 <ParamField path="TRACELOOP_BASE_URL" type="string">
diff --git a/strix/config/settings.py b/strix/config/settings.py
index 6e696b1..bdd96c2 100644
--- a/strix/config/settings.py
+++ b/strix/config/settings.py
@@ -72,17 +72,11 @@ class RuntimeSettings(BaseSettings):
 
 
 class TelemetrySettings(BaseSettings):
-    """Telemetry toggles. ``posthog`` is None → inherit ``master``."""
+    """Telemetry toggle."""
 
     model_config = _BASE_CONFIG
 
-    master: bool = Field(default=True, alias="STRIX_TELEMETRY")
-    posthog: bool | None = Field(default=None, alias="STRIX_POSTHOG_TELEMETRY")
-
-    @property
-    def posthog_enabled(self) -> bool:
-        """Effective PostHog toggle: explicit value if set, else ``master``."""
-        return self.master if self.posthog is None else self.posthog
+    enabled: bool = Field(default=True, alias="STRIX_TELEMETRY")
 
 
 class IntegrationSettings(BaseSettings):
diff --git a/strix/interface/main.py b/strix/interface/main.py
index 6fafab1..b9c0145 100644
--- a/strix/interface/main.py
+++ b/strix/interface/main.py
@@ -44,7 +44,7 @@ from strix.interface.utils import (
 )
 from strix.report.state import get_global_report_state
 from strix.report.writer import read_run_record, write_run_record
-from strix.telemetry import posthog
+from strix.telemetry import posthog, scarf
 from strix.telemetry.logging import configure_dependency_logging
 
 
@@ -735,13 +735,15 @@ def main() -> None:
         # re-supplying targets / instructions / scope.
         _persist_run_record(args)
 
-    posthog.start(
-        model=load_settings().llm.model,
-        scan_mode=args.scan_mode,
-        is_whitebox=is_whitebox_scan(args.targets_info),
-        interactive=not args.non_interactive,
-        has_instructions=bool(args.instruction),
-    )
+    _telemetry_start_kwargs = {
+        "model": load_settings().llm.model,
+        "scan_mode": args.scan_mode,
+        "is_whitebox": is_whitebox_scan(args.targets_info),
+        "interactive": not args.non_interactive,
+        "has_instructions": bool(args.instruction),
+    }
+    posthog.start(**_telemetry_start_kwargs)
+    scarf.start(**_telemetry_start_kwargs)
 
     exit_reason = "user_exit"
     try:
@@ -754,6 +756,7 @@ def main() -> None:
     except Exception as e:
         exit_reason = "error"
         posthog.error("unhandled_exception", str(e))
+        scarf.error("unhandled_exception", str(e))
         raise
     finally:
         report_state = get_global_report_state()
@@ -764,6 +767,7 @@ def main() -> None:
             )
             report_state.cleanup(status=status)
             posthog.end(report_state, exit_reason=exit_reason)
+            scarf.end(report_state, exit_reason=exit_reason)
 
     results_path = run_dir_for(args.run_name)
     display_completion_message(args, results_path)
diff --git a/strix/report/state.py b/strix/report/state.py
index c9541d0..a69ced7 100644
--- a/strix/report/state.py
+++ b/strix/report/state.py
@@ -16,7 +16,7 @@ from strix.report.writer import (
     write_run_record,
     write_vulnerabilities,
 )
-from strix.telemetry import posthog
+from strix.telemetry import posthog, scarf
 
 
 logger = logging.getLogger(__name__)
@@ -202,6 +202,7 @@ class ReportState:
         self.vulnerability_reports.append(report)
         logger.info(f"Added vulnerability report: {report_id} - {title}")
         posthog.finding(severity)
+        scarf.finding(severity)
 
         if self.vulnerability_found_callback:
             self.vulnerability_found_callback(report)
@@ -254,6 +255,7 @@ class ReportState:
         logger.info("Updated scan final fields")
         self.save_run_data(mark_complete=True)
         posthog.end(self, exit_reason="finished_by_tool")
+        scarf.end(self, exit_reason="finished_by_tool")
 
     def set_scan_config(self, config: dict[str, Any]) -> None:
         self.scan_config = config
diff --git a/strix/telemetry/README.md b/strix/telemetry/README.md
index bb90fe1..ba9fc1e 100644
--- a/strix/telemetry/README.md
+++ b/strix/telemetry/README.md
@@ -18,11 +18,9 @@ We collect only very **basic** usage data including:
 **Model Usage:** Which LLM model is being used (not prompts or responses)\
 **Aggregate Metrics:** Vulnerability counts by severity
 
-For complete transparency, you can inspect our [telemetry implementation](https://github.com/usestrix/strix/blob/main/strix/telemetry/posthog.py) to see the exact events we track.
-
 ### What We **Never** Collect
 
-- IP addresses, usernames, or any identifying information
+- Usernames, or any identifying information
 - Scan targets, file paths, target URLs, or domains
 - Vulnerability details, descriptions, or code
 - LLM requests and responses
diff --git a/strix/telemetry/__init__.py b/strix/telemetry/__init__.py
index 8421eb7..b9ca597 100644
--- a/strix/telemetry/__init__.py
+++ b/strix/telemetry/__init__.py
@@ -1,6 +1,7 @@
-from . import posthog
+from . import posthog, scarf
 
 
 __all__ = [
     "posthog",
+    "scarf",
 ]
diff --git a/strix/telemetry/_common.py b/strix/telemetry/_common.py
new file mode 100644
index 0000000..ff53cee
--- /dev/null
+++ b/strix/telemetry/_common.py
@@ -0,0 +1,50 @@
+from __future__ import annotations
+
+import logging
+import platform
+import sys
+from importlib.metadata import PackageNotFoundError, version
+from pathlib import Path
+from typing import Any
+from uuid import uuid4
+
+
+logger = logging.getLogger(__name__)
+
+SESSION_ID: str = uuid4().hex[:16]
+
+_FIRST_RUN_CACHED: bool | None = None
+
+
+def get_version() -> str:
+    try:
+        return version("strix-agent")
+    except PackageNotFoundError:
+        logger.debug("strix-agent version lookup failed", exc_info=True)
+        return "unknown"
+
+
+def is_first_run() -> bool:
+    global _FIRST_RUN_CACHED  # noqa: PLW0603
+    if _FIRST_RUN_CACHED is not None:
+        return _FIRST_RUN_CACHED
+    marker = Path.home() / ".strix" / ".seen"
+    if marker.exists():
+        _FIRST_RUN_CACHED = False
+        return False
+    try:
+        marker.parent.mkdir(parents=True, exist_ok=True)
+        marker.touch()
+    except Exception:  # noqa: BLE001, S110
+        pass  # nosec B110
+    _FIRST_RUN_CACHED = True
+    return True
+
+
+def base_props() -> dict[str, Any]:
+    return {
+        "os": platform.system().lower(),
+        "arch": platform.machine(),
+        "python": f"{sys.version_info.major}.{sys.version_info.minor}",
+        "strix_version": get_version(),
+    }
diff --git a/strix/telemetry/posthog.py b/strix/telemetry/posthog.py
index 3a2a669..3db7c0f 100644
--- a/strix/telemetry/posthog.py
+++ b/strix/telemetry/posthog.py
@@ -1,13 +1,15 @@
 import json
 import logging
-import platform
-import sys
 import urllib.request
-from pathlib import Path
+from datetime import datetime
 from typing import TYPE_CHECKING, Any
-from uuid import uuid4
 
 from strix.config import load_settings
+from strix.telemetry._common import (
+    SESSION_ID,
+    base_props,
+    is_first_run,
+)
 
 
 if TYPE_CHECKING:
@@ -19,34 +21,9 @@ logger = logging.getLogger(__name__)
 _POSTHOG_PUBLIC_API_KEY = "phc_7rO3XRuNT5sgSKAl6HDIrWdSGh1COzxw0vxVIAR6vVZ"
 _POSTHOG_HOST = "https://us.i.posthog.com"
 
-_SESSION_ID = uuid4().hex[:16]
-
 
 def _is_enabled() -> bool:
-    """Master telemetry gate. ``STRIX_POSTHOG_TELEMETRY`` overrides ``STRIX_TELEMETRY``."""
-    return load_settings().telemetry.posthog_enabled
-
-
-def _is_first_run() -> bool:
-    marker = Path.home() / ".strix" / ".seen"
-    if marker.exists():
-        return False
-    try:
-        marker.parent.mkdir(parents=True, exist_ok=True)
-        marker.touch()
-    except Exception:  # noqa: BLE001, S110
-        pass  # nosec B110
-    return True
-
-
-def _get_version() -> str:
-    try:
-        from importlib.metadata import version
-
-        return version("strix-agent")
-    except Exception:  # noqa: BLE001
-        logger.debug("strix-agent version lookup failed", exc_info=True)
-        return "unknown"
+    return load_settings().telemetry.enabled
 
 
 def _send(event: str, properties: dict[str, Any]) -> None:
@@ -57,7 +34,7 @@ def _send(event: str, properties: dict[str, Any]) -> None:
         payload = {
             "api_key": _POSTHOG_PUBLIC_API_KEY,
             "event": event,
-            "distinct_id": _SESSION_ID,
+            "distinct_id": SESSION_ID,
             "properties": properties,
         }
         req = urllib.request.Request(  # noqa: S310
@@ -74,15 +51,6 @@ def _send(event: str, properties: dict[str, Any]) -> None:
         logger.debug("posthog event sent: %s", event)
 
 
-def _base_props() -> dict[str, Any]:
-    return {
-        "os": platform.system().lower(),
-        "arch": platform.machine(),
-        "python": f"{sys.version_info.major}.{sys.version_info.minor}",
-        "strix_version": _get_version(),
-    }
-
-
 def start(
     model: str | None,
     scan_mode: str | None,
@@ -93,13 +61,13 @@ def start(
     _send(
         "scan_started",
         {
-            **_base_props(),
+            **base_props(),
             "model": model or "unknown",
             "scan_mode": scan_mode or "unknown",
             "scan_type": "whitebox" if is_whitebox else "blackbox",
             "interactive": interactive,
             "has_instructions": has_instructions,
-            "first_run": _is_first_run(),
+            "first_run": is_first_run(),
         },
     )
 
@@ -108,7 +76,7 @@ def finding(severity: str) -> None:
     _send(
         "finding_reported",
         {
-            **_base_props(),
+            **base_props(),
             "severity": severity.lower(),
         },
     )
@@ -123,8 +91,6 @@ def end(report_state: "ReportState", exit_reason: str = "completed") -> None:
 
     duration = 0.0
     try:
-        from datetime import datetime
-
         start = datetime.fromisoformat(report_state.start_time.replace("Z", "+00:00"))
         end_iso = report_state.end_time or datetime.now(start.tzinfo).isoformat()
         duration = (datetime.fromisoformat(end_iso.replace("Z", "+00:00")) - start).total_seconds()
@@ -148,7 +114,7 @@ def end(report_state: "ReportState", exit_reason: str = "completed") -> None:
     _send(
         "scan_ended",
         {
-            **_base_props(),
+            **base_props(),
             "exit_reason": exit_reason,
             "duration_seconds": round(duration),
             "vulnerabilities_total": len(report_state.vulnerability_reports),
@@ -159,7 +125,7 @@ def end(report_state: "ReportState", exit_reason: str = "completed") -> None:
 
 
 def error(error_type: str, error_msg: str | None = None) -> None:
-    props = {**_base_props(), "error_type": error_type}
+    props = {**base_props(), "error_type": error_type}
     if error_msg:
         props["error_msg"] = error_msg
     _send("error", props)
diff --git a/strix/telemetry/scarf.py b/strix/telemetry/scarf.py
new file mode 100644
index 0000000..25e38c4
--- /dev/null
+++ b/strix/telemetry/scarf.py
@@ -0,0 +1,140 @@
+from __future__ import annotations
+
+import logging
+import urllib.parse
+import urllib.request
+from datetime import datetime
+from typing import TYPE_CHECKING, Any
+
+from strix.config import load_settings
+from strix.telemetry._common import (
+    SESSION_ID,
+    base_props,
+    get_version,
+    is_first_run,
+)
+
+
+if TYPE_CHECKING:
+    from strix.report.state import ReportState
+
+
+logger = logging.getLogger(__name__)
+
+_SCARF_ENDPOINT = "https://strix.gateway.scarf.sh"
+
+
+def _is_enabled() -> bool:
+    return load_settings().telemetry.enabled
+
+
+def _send(event: str, properties: dict[str, Any]) -> None:
+    if not _is_enabled():
+        logger.debug("scarf disabled; skipping event %s", event)
+        return
+    try:
+        props = dict(properties)
+        version = str(props.pop("strix_version", get_version()) or "unknown")
+        path = f"/{urllib.parse.quote(event, safe='')}/{urllib.parse.quote(version, safe='')}"
+        query = urllib.parse.urlencode(
+            {k: ("" if v is None else str(v)) for k, v in props.items()},
+        )
+        url = f"{_SCARF_ENDPOINT}{path}"
+        if query:
+            url = f"{url}?{query}"
+        req = urllib.request.Request(url, method="POST")  # noqa: S310
+        with urllib.request.urlopen(req, timeout=10):  # noqa: S310  # nosec B310
+            pass
+    except Exception:  # noqa: BLE001
+        logger.debug("scarf send failed for event %s", event, exc_info=True)
+    else:
+        logger.debug("scarf event sent: %s", event)
+
+
+def start(
+    model: str | None,
+    scan_mode: str | None,
+    is_whitebox: bool,
+    interactive: bool,
+    has_instructions: bool,
+) -> None:
+    _send(
+        "scan_started",
+        {
+            **base_props(),
+            "session": SESSION_ID,
+            "model": model or "unknown",
+            "scan_mode": scan_mode or "unknown",
+            "scan_type": "whitebox" if is_whitebox else "blackbox",
+            "interactive": interactive,
+            "has_instructions": has_instructions,
+            "first_run": is_first_run(),
+        },
+    )
+
+
+def finding(severity: str) -> None:
+    _send(
+        "finding_reported",
+        {
+            **base_props(),
+            "session": SESSION_ID,
+            "severity": severity.lower(),
+        },
+    )
+
+
+def end(report_state: ReportState, exit_reason: str = "completed") -> None:
+    vulnerabilities_counts = {"critical": 0, "high": 0, "medium": 0, "low": 0, "info": 0}
+    for v in report_state.vulnerability_reports:
+        sev = v.get("severity", "info").lower()
+        if sev in vulnerabilities_counts:
+            vulnerabilities_counts[sev] += 1
+
+    duration = 0.0
+    try:
+        scan_start = datetime.fromisoformat(report_state.start_time.replace("Z", "+00:00"))
+        end_iso = report_state.end_time or datetime.now(scan_start.tzinfo).isoformat()
+        duration = (
+            datetime.fromisoformat(end_iso.replace("Z", "+00:00")) - scan_start
+        ).total_seconds()
+    except (ValueError, TypeError, AttributeError):
+        pass
+
+    llm_props: dict[str, int | float] = {}
+    try:
+        usage = report_state.get_total_llm_usage()
+        if isinstance(usage, dict):
+            llm_props = {
+                "llm_requests": int(usage.get("requests") or 0),
+                "llm_input_tokens": int(usage.get("input_tokens") or 0),
+                "llm_output_tokens": int(usage.get("output_tokens") or 0),
+                "llm_tokens": int(usage.get("total_tokens") or 0),
+                "llm_cost": float(usage.get("cost") or 0.0),
+            }
+    except (TypeError, ValueError, AttributeError):
+        pass
+
+    _send(
+        "scan_ended",
+        {
+            **base_props(),
+            "session": SESSION_ID,
+            "exit_reason": exit_reason,
+            "duration_seconds": round(duration),
+            "vulnerabilities_total": len(report_state.vulnerability_reports),
+            **{f"vulnerabilities_{k}": v for k, v in vulnerabilities_counts.items()},
+            **llm_props,
+        },
+    )
+
+
+def error(error_type: str, error_msg: str | None = None) -> None:
+    props: dict[str, Any] = {
+        **base_props(),
+        "session": SESSION_ID,
+        "error_type": error_type,
+    }
+    if error_msg:
+        props["error_msg"] = error_msg
+    _send("error", props)