RapidAI vs Viz.ai
Updated October 16, 2026
Stroke centers buying imaging software often compare RapidAI and Viz.ai. Both read brain scans for blocked arteries and alert the stroke team, but RapidAI is known for perfusion maps that guide clot removal decisions, while Viz.ai is known for care team coordination and alerts across many conditions. Centers that select patients on imaging detail and centers focused on speed to the specialist weigh them differently.
Our analysts compared RapidAI and Viz.ai on scan reading, care team coordination, research, adoption, conditions beyond stroke, and rollout, using the HIR review of each company and both vendors' newsrooms. In the following sections, we compare the platforms, describe the center each suits, and list each company's recent launches.
RapidAI vs Viz.ai at a glance, October 2026
| What buyers weigh | RapidAI | Viz.ai |
|---|---|---|
| Pricing model | A subscription quoted by RapidAI, usually priced by hospital or network and by the modules you turn on. | Licenses for the whole organization, often priced by care path or site. |
| What drives cost | Number of sites, which modules you use (stroke, brain bleed, aneurysm, vascular, radiology worklist), and connections to PACS and mobile alerts. | Which urgent care modules you turn on and how alert systems are supported. |
| Reading the scans for treatment decisions | Reads non-contrast CT, CT angiography, and CT perfusion, and its perfusion maps helped choose patients in the trials that extended the treatment window from 6 to 24 hours. Clear edge | Flags suspected blocked arteries on CT angiography and sends the images straight to the specialist's phone. |
| Coordinating the care team | Sends results to stroke and vascular teams as part of a wider imaging platform. | Alerts, shared images, and team messaging across the emergency department, radiology, and the stroke team are the center of Viz.ai's platform, which scores 7.8 on coordination. Clear edge |
| Published research | Studied in more than 750 peer-reviewed papers. Clear edge | More than 100 clinical publications and abstracts by January 2025. |
| Hospitals using it | More than 2,500 hospitals. | Nearly 2,000 U.S. hospitals as of 2026. |
| Conditions covered beyond stroke | Added brain bleeds, aneurysms, cardiovascular, endovascular, and trauma imaging from 2022 on. | Lists more than 50 AI care pathways across neurology, radiology, cardiology, cancer, and lung disease. Clear edge |
| Getting hospitals live | Scores 7.6, and it needs connected scanners and a named owner for the stroke program. | Needs an IT owner for mobile alerts and on-call schedules, and emergency, radiology, and specialty teams who agree on alert rules. |
| Time to full value | About 5 to 10 months | About 6 to 13 months |
| What you need first | Stroke program owner. | Urgent care paths (often stroke) where minutes to a specialist matter. |
| Deal-breaker | Nobody owns the stroke program. | You only want a narrow detection algorithm without care team coordination. |
| Pricing clarity score | 7.1 | 7.1 |
| HIR overall score | 8.1, Recommend. Higher score | 7.7, Recommend. |
| Best for | Stroke centers and health systems that select patients for clot removal using CT perfusion and CT angiography. | Stroke and other emergency care teams where the minutes between the scan and the specialist matter most. |
| Not a fit for | Small hospitals that only need a basic alert for a blocked brain artery. | Hospitals that only want an algorithm to read images and have no use for care-team alerts and messaging. |
Which fits which buyer
Consider whether imaging detail or team speed is your bottleneck.
Choose RapidAI if
- You select patients for clot removal using CT perfusion and angiography.
- You value the largest body of peer-reviewed research.
- You want chest and other imaging AI added through the same platform.
Choose Viz.ai if
- Minutes between scan and specialist are your biggest concern.
- Emergency, radiology, and stroke teams need shared alerts and messaging.
- You want AI care pathways in cardiology, pulmonary, and other areas.
What buyers say
“So far, I’ve found the software’s detection to be very accurate so long as the exam is of decent quality. It is susceptible to motion and does not do well with LVO detection with poor contrast boluses (not that I blame it for that). The biggest positive with RapidAI is it’s speed.” HotPocketMcGee816 · r/Radiology · Feb 9, 2023, source
“It really helps facilitate transfer of patients that require more intervention than we can provide. The cost that I gave you before is per location, so if you have multiple sites, it will add up.” HotPocketMcGee816 · r/Radiology · Feb 9, 2023, source
“As a radiologist I like using it because it helps focus my interpretation to a specific region of anatomy. However, this is true of ct perfusion it general, not rapid AI in particular. I will say that the neuro stroke team seems to like the data rapid AI gives them.” Timberdale · r/Radiology · Feb 9, 2023, source
“Sometime it works great. Other times it will spit out estimates that don't fit into a vascular distribution or even falsely call a whole hemisphere penumbra. As such, our neuroradiologists aren't huge fans, and think it just causes more work” azulsquall · r/Radiology · May 21, 2018, source
Verdict
RapidAI scores higher and is the stronger choice for comprehensive stroke centers that make treatment decisions on imaging. Viz.ai suits systems that want care team coordination across many emergency conditions.
Small hospitals that need only a basic alert may find both more than necessary.
Where the two tools are headed in 2027 and beyond
RapidAI: RapidAI announced on August 14, 2026 that OSF HealthCare had extended it to all of its hospitals, and on October 6, 2026 added Riverain's chest imaging AI to its platform.
Viz.ai: Viz.ai launched a pulmonary suite on July 9, 2026, and announced a neurodegenerative disease collaboration with Cortechs.ai on July 15, 2026.
Ask each for door-to-groin times from a center like yours.
Methodology
Each row comes from the HIR reviews of RapidAI and Viz.ai, scored under the HIR method, and from each vendor's public pricing where it exists. Any published price for RapidAI or Viz.ai was checked on that vendor's own site on October 16, 2026.
A green check marks a clear edge for RapidAI or Viz.ai only where their review scores differ by at least 0.3 points or the two reviews show a plain difference. Rows with nothing published for either RapidAI or Viz.ai are left out, and time to full value for each adds up the rollout stages in its review.
Sources
- HIR review of RapidAI and HIR review of Viz.ai
- RapidAI website
- Viz.ai website
- Reddit discussions of RapidAI and Viz.ai, linked in the buyer section
- OSF HealthCare expands RapidAI, August 14, 2026
- Riverain ClearRead on RapidAI, October 6, 2026
- Viz.ai launches pulmonary suite, July 9, 2026
- Viz.ai and Cortechs.ai, July 15, 2026