For home and small-business buyers cross-shopping refurbished AEDs, the OnSite's direct competitors are the rugged Philips HeartStart FRx (its outdoor-rated sibling) and the HeartSine Samaritan PAD 350P (a similarly-priced compact AED with a single-cartridge pad-plus-battery design).
Pick the OnSite when you want a simple, indoor-friendly AED with OTC purchase status for home use. Step up to the HeartStart FRx if you need outdoor durability, wider temperature tolerance, or the simpler Infant/Child Key system for pediatric rescue. Consider the HeartSine Samaritan PAD 350P if you want the lightest possible AED with combined pad+battery maintenance.
Designed for the Untrained Responder
Philips engineered the OnSite around one assumption: the person reaching for it may have never seen an AED before. The device starts speaking the moment you pull the green handle. Calm, paced voice instructions walk through every step pad placement, when to push the orange shock button, how to perform CPR. The SMART Pads sense when they've been placed on the patient, and the device adjusts its pacing to match the responder's actions.
This is the design philosophy that earned the OnSite its FDA over-the-counter clearance the FDA only grants OTC status to devices that pass usability testing with untrained members of the general public. Most AEDs require prescription review because the FDA wants a clinician confirming the buyer understands the device. The OnSite passed that bar.
SMART Biphasic WaveformPhilips' clinically validated defibrillation waveform adjusts pulse parameters to each patient's transthoracic impedance. Backed by 40+ peer-reviewed studies. Same waveform as the more expensive HeartStart FRx.
SMART Analysis TechnologyThe device evaluates the heart rhythm and only delivers a shock if its algorithm determines one is medically appropriate even if the responder presses the shock button. Eliminates the risk of inappropriate shocks.
SMART Pads with Position SensingThe SMART Pads sense when they have been placed on the patient. The device adapts voice prompt pacing to the responder's actions slowing down or speeding up based on the rescue's progress.
Just 3.3 PoundsAmong the lightest AEDs in the public-access category. Light enough for a home owner to carry easily, light enough to mount on any wall without specialized hardware.
Daily Self-TestsThe device performs automatic self-tests daily, weekly, and monthly testing battery, electronics, and pad connection. Status is shown by the blinking green readiness indicator visible without powering the device on.
30-Day Data StorageStores the last 30 days of device use data and 15 minutes of ECG following the last pad application. Transferable to a PC via Philips HeartStart Event Review software for post-rescue clinical review.
Voice-Guided CPR CoachingStep-by-step voice prompts guide responders through the entire rescue — from pad placement to chest compressions. The OnSite includes adult and child CPR coaching modes (child mode active when pediatric pads are installed).
HSA / FSA EligibleThe OnSite is generally HSA and FSA eligible for personal home purchase per Philips and the IRS — a significant cost savings for individual buyers. Consult your HSA/FSA administrator to confirm.
Pre-Connected PadsThe SMART Pads cartridge stays plugged into the device at all times. No fumbling with connectors during a rescue just peel and place on the patient.
