ON-DEVICE PROCESSING
Acoustic analysis is designed to happen locally on participating devices.
Turn every phone into a gunshot witness.
Distributed gunshot detection using the smartphones already in your community. RoundSift helps participating devices detect, corroborate and locate potential firearm discharges—without installing a traditional sensor network.
On-device processing • No continuous audio upload • Peer corroboration • No continuous location tracking
Trust
Detection privacy
- On-device processingThe impulse analyzer scores matches locally — your microphone is watched on the phone, not in the cloud.
- No continuous audio uploadOnly a short acoustic fingerprint leaves the phone, and only when an impulse matches.
- Peer corroborationNearby phones cross-check the impulse before an estimate is recorded.
- No continuous location trackingThere is no movement trail; the only GPS captured is the coarse fix tied to a corroborated event.
Pick your path
Pick your path
For individuals
Help strengthen coverage in your community.
Participating smartphones can act as independent witnesses, allowing coverage to grow with participation.
For organizations
Deploy RoundSift across a campus, property, neighborhood, event or jurisdiction.
Pilot requests route to our partnerships team. We scope the deployment together — defined area, measurement plan, and a contract that grows only after the numbers hold up.
Mechanism
Four steps, all on-device or peer-confirmed.
Nothing from your microphone leaves the phone until an acoustic fingerprint matches an impulse signature. Then nearby phones either confirm it — or don't. The short version:
Process steps
- step 01LISTEN
On-device software listens for firearm-like acoustic impulse signatures.
- step 02FINGERPRINT
Potential events are converted into acoustic characteristics locally on the device.
- step 03CORROBORATE
Nearby participating devices independently verify matching events.
- step 04RECORD
Confirmed events create a structured, verifiable incident record.
- step 01LISTEN
On-device software listens for firearm-like acoustic impulse signatures.
- step 02FINGERPRINT
Potential events are converted into acoustic characteristics locally on the device.
- step 03CORROBORATE
Nearby participating devices independently verify matching events.
- step 04RECORD
Confirmed events create a structured, verifiable incident record.
See it in action
SEE ROUNDSIFT IN ACTION
Watch multiple participating phones independently detect and corroborate a simulated firearm event.
Illustrative simulation — not a real incident.
Network simulation — sample data
Not real incident data. Not a performance benchmark. All coordinates, device IDs, and timings are illustrative.
Event
In the wild
From detection to dispatch: every phone on the block corroborates, a pin is placed on the source, and responding units see it on their screen.
Coverage scope
Who It's For
Each RoundSift deployment shapes itself to the operating environment it's covering — the same pipeline, retuned to the kind of coverage that community actually has.
- URBANMunicipalities & Public Safety
Cover neighborhoods and dispatch corroboration across blocks, beyond a paid sensor zone.
- UNIVUniversities & Campuses
Instrument dorms, quads, and common areas — security gets a corroborating second look the moment an impulse is heard.
- PROPCommercial Properties
Line retail corridors and multi-tenant buildings with shared records, no new hardware.
- HOAResidential Communities
Scale into planned communities and multifamily properties — coverage grows with each resident who opts in.
- HLTHHealthcare Campuses
Cover hospitals and multi-building clinical sites with incident corroboration in the same record shape.
- TRANSTransportation & Infrastructure
Stretch along rail, road, and right-of-way corridors — coverage follows the device, not the trench.
Privacy & Security
Detection without turning phones into surveillance devices.
Four principles shape how RoundSift handles audio, location, and corroboration — so participating devices stay witnesses, not informants.
01 02 NO CONTINUOUS RAW AUDIO UPLOAD
Raw microphone audio is not continuously transmitted to RoundSift servers.
03 EVENT-BASED LOCATION
Location information is associated with relevant events rather than maintaining a continuous movement history.
04 PEER CORROBORATION
Multiple participating devices can independently contribute evidence before an event is considered confirmed.
For organizations
Bring RoundSift to your organization
RoundSift is exploring pilot deployments with municipalities, campuses, property operators, public-safety organizations and technology partners.