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A data-grounded look at how these two productivity & automation tools stack up — to help you pick the right productivity & automation tool in 2026.
Quick verdict
Onyx takes a 0.2-point lead on our Editor Score. Pick Onyx if you want hybrid search with advanced RAG and contextual retrieval; choose Plus AI for native add-on for Google Slides and PowerPoint. On pricing, Onyx is the one with a free or freemium plan, so it's the cheaper place to start.
| Pricing | Freemium | Subscription |
| Free tier | ||
| Best for | hybrid search with advanced RAG and contextual retrieval | native add-on for Google Slides and PowerPoint |
Open-source AI chat connected to your docs and apps
AI presentations inside Google Slides and PowerPoint
Choose Onyx if…
Choose Plus AI if…
It comes down to fit, not a single winner: Onyx leans into hybrid search with advanced RAG and contextual retrieval, while Plus AI is built for native add-on for Google Slides and PowerPoint. Weigh features and pricing for your workflow. Onyx is the lower-cost place to start thanks to its free or freemium plan; the other is worth a trial if its feature set fits better.
Neither is universally better — it depends on your budget and which features matter most. The side-by-side breakdown above shows where each one wins.
Onyx (freemium) is best for hybrid search with advanced RAG and contextual retrieval, while Plus AI (subscription) is best for native add-on for Google Slides and PowerPoint. See the full feature and pricing comparison above.
Onyx has a free or freemium plan, so it's the cheaper way to start. For paid plans, check each tool's current pricing on its review page.
Onyx is usually the easier starting point thanks to a lower barrier to entry. Beginners should favour a free tier and a simple interface over raw power.
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Last updated August 2026. Comparisons are ranked by our Editor Score (features, value and pricing, blended with verified user reviews where a tool has them) — see our methodology.