Where to download OlyVIA (Windows)
- Open Evident's Software Downloads hub and search for OlyVIA.
- Choose the newest installer. On 13 November 2026 that was OlyVIA V5.1 Installer (433 MB, English), listed under the VS200; older builds from V3.4.1 to V4.2.1 were still listed.
- Enter the contact details the download asks for: company, email, first and last name, phone number and location when we checked.
- Install it on a 64-bit Windows 10 or 11 PC and open the
.vsi file.
Evident showed no release notes for V5.1 when we checked. The newest installer with published notes, OlyVIA V4.1.1, lists Windows 10 64-bit and Windows 11 64-bit and states that other operating systems are not supported. Those notes describe OlyVIA as free image viewer software that reads VSI and TIFF images from VS200 and VS120 slide scanners and from cellSens.
Download it from Evident rather than a third-party download site.
Is there an OlyVIA for Mac?
No. Evident's installer notes list only 64-bit Windows 10 and 11, and its own introduction to OlyVIA describes a free desktop app for Windows PCs. Viewing in a web browser is a different product that needs Evident's Net Image Server. To open a VSI file that sits on your Mac, use a viewer that runs on macOS:
Looking for cellSens, not OlyVIA?
cellSens is Evident's acquisition and analysis software, offered in Entry, Standard and Dimension packages. Its installers are in the same downloads hub (cellSens V4.5 when we checked), it runs on 64-bit Windows 10 Professional and Windows 11 Pro, and Evident's page describes updates by the version on your licence card; it mentions no free edition. If you only want to look at a VSI file that cellSens saved, you do not need cellSens: OlyVIA is the free viewer, and the tools on this page open VSI too.
How to open a VSI file on a Mac or Windows with SlideScope
- Install SlideScope for macOS 14 or later (Apple silicon or Intel) or for Windows 10 or 11. The download is free, and the built-in sample library is free with every tool; opening your own images needs a subscription.
- Copy the complete image to a local disk: the
.vsi file and the folder beside it whose name is the file name between underscores, which holds the pixel data in .ets files. Do not rename either one.
- Open the
.vsi file in SlideScope, or drag it into the viewer.
- Pan and zoom, choose a scan region if the slide has several, switch fluorescence channels, check the objective and channel names in Details, and measure in calibrated units.
If only the .vsi file arrives, the image cannot open: it is a small index, and the pixels live in the folder. SlideScope checks for that folder and tells you what is missing. Each scan region is measured at its own pixel size. Full limits are on the file compatibility page and in the VSI guide.
OlyVIA, QuPath and SlideScope compared
OlyVIA facts come from Evident's own pages, checked on 13 November 2026; see the sources below.
When OlyVIA is the better choice
If you are on Windows and your images all come from an Evident or Olympus system, OlyVIA is free and is made by the company behind the format. Evident also offers web viewing of slides through its Net Image Server, which SlideScope does not connect to. If you need free analysis on a Mac or on Linux, QuPath and Fiji read VSI through Bio-Formats. SlideScope fits when you are on a Mac and want to look, measure and annotate without setting up a project, or when VSI is one of several scanner formats you receive. For the wider field, see the whole slide image viewer comparison.
OlyVIA and VSI questions
Is OlyVIA free?
Yes. Evident describes OlyVIA as free image viewer software for images from its VS200 and VS120 slide scanners and from cellSens.
Where can I download OlyVIA?
From Evident's Software Downloads hub: search for OlyVIA and choose the newest installer, which was OlyVIA V5.1 when we checked on 13 November 2026. The download asks for contact details first.
Is there an OlyVIA for Mac?
No. Evident lists only 64-bit Windows 10 and 11 and states that other operating systems are not supported. To open VSI files on a Mac, use QuPath or Fiji with Bio-Formats, which are free, or SlideScope, which runs on macOS 14 or later on Apple silicon and Intel.
Why won't my VSI file open?
Usually because only the .vsi file was copied. A VSI image is the .vsi file plus a folder beside it, named after the file between underscores, that holds the pixel data in .ets files. Copy the file and that folder together, keep their names unchanged, and open the .vsi again.
Do I need cellSens to open a VSI file?
No. cellSens is Evident's acquisition and analysis software and is licensed. OlyVIA is the free viewer on Windows, and QuPath, Fiji and SlideScope open VSI on Windows and Mac.
Is SlideScope free?
No. SlideScope is a paid app. The download and the built-in sample library are free, with every tool, and the app checks for free whether your own files open. Opening your own images needs a subscription; current prices are on the plans page.
Does SlideScope upload my images?
No. SlideScope reads VSI files from your own disk. Optional features such as AI Analysis or shared links are separate, and only run when you choose to use them.
Sources and non-affiliation note
SlideScope is independent and is not affiliated with, endorsed by, or sponsored by Evident or Olympus. OlyVIA and cellSens are names of Evident products and are used here only to describe comparison and alternative search intent. Facts about OlyVIA and cellSens were taken from Evident's own pages on 13 November 2026:
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