These two barely compete — which is exactly why the comparison is useful. One turns Office documents around faster; the other replaces search. Knowing which problem you actually have saves you $20 a month.
Different jobs: Copilot accelerates Office documents (free basic; $16.67/mo for full integration), Perplexity Pro ($20) replaces search with cited answers. If your day is split between both problems, the pair costs less than one ChatGPT Pro.
By Microsoft. Full Copilot profile →
By Perplexity AI. Full Perplexity profile →
Best for: Excel data, Word drafting, PowerPoint decks, Outlook triage
Weakness: Pro plan is half-useful without an M365 subscription on top
From $0 (free)/mo. Top tier: $16.67/mo.
Best for: Research with verifiable sources, fact-checking, exploring unfamiliar topics
Weakness: Less suited for creative writing or open-ended chat
From $0 (free)/mo. Top tier: $200/mo.
Pick Copilot if your bottleneck is Office output: drafting in Word, formulas in Excel, triage in Outlook. Free basic chat covers casual use; M365 Premium ($16.67/mo) unlocks the full in-app integration.
Pick Perplexity if your bottleneck is finding things out: cited answers from the live web, 300+ Pro searches a day, choice of underlying models. It's the research department Copilot doesn't have.
They stack cleanly: many professionals run free Copilot inside Office and pay for Perplexity Pro as the research layer.
It can search and summarize, but citations are weaker and the flow is built around documents, not inquiry. Perplexity's whole product is verifiable answers.
Copilot starts free; its paid path is M365 Premium at $16.67/mo (billed annually) which includes Office. Perplexity Pro is a flat $20/mo with a generous free tier below it.
If you write in Office all day and research a lot, genuinely maybe — free Copilot plus Perplexity Pro is a strong $20/month stack.