Choose Classter if you need
- Integration with Office 365, Moodle or Zoom. We haven't found them on Opus1's website.
Side by side, from each tool's own website. A tool's rating shows once it has 3 reviews.
From each tool's own website, checked on the dates below, and from published reviews.
From the facts checked for both tools, not from opinion. A fact we haven't confirmed for one of them is never counted.

Nobody has reviewed Classter yet. Its rating shows once it has 3 reviews.
Review Classter
Nobody has reviewed Opus1 yet. Its rating shows once it has 3 reviews.
Review Opus1From the platforms and integrations each website lists.
Reviewers who say they used one of these before the other.
No reviewer has said they moved between Classter and Opus1 yet.
Your review makes this comparison better for the next person. Review Classter or review Opus1.
Classter: Facts from classter.com, checked November 14, 2026. Sources: classter.com, classter.com/pricing, classter.com/product, classter.com/product/integrations-and-api.
Opus1: Facts from opus1.io, checked November 13, 2026. Sources: opus1.io, opus1.io/pricing, opus1.io/resources/product-updates.
Prices change, so confirm on their sites.