Independent AI buying guide
No paid rankings
Last checked 26 Oct 2026
Is it worth it?
Lumo Plus costs $9.99/mo, billed yearly. We hold it up against Lumo's free plan, every other free plan and every cheaper subscription, on independent test scores.
The verdict
Lumo Plus · $9.99/mo, billed yearly
Probably not
Claude Free costs nothing and scores 96% of Lumo Plus overall (80/100 against 83/100).
But: Claude Free is not from a European company.
But: Claude Free doesn't make the same privacy promise as Lumo.
Lumo Plus against Lumo's free plan and the best subscription per topic, scored out of 100.
| Topic | Lumo Plus | Lumo free | Best subscription |
|---|---|---|---|
| Overall | 83GLM 5.3 | 75 | 98Gemini Google AI Pro |
| Coding | 71GLM 5.3 | 64 | 99GitHub Copilot Pro |
| Writing | 84GLM 5.3 | 75 | 100Claude Pro |
| Maths & hard problems | 86GLM 5.3 | 78 | 98ChatGPT Plus |
| Studying | 89GLM 5.3 | 80 | 100Gemini Google AI Pro |
| Business & office | 89GLM 5.3 | 80 | 100Gemini Google AI Pro |
Our opinion first, then the sourced facts: price, AI models and what's included.
Lumo Plus
Our take (opinion, reviewed 9 Oct 2026)
Proton's privacy-first assistant from Switzerland, built on open-source models. Not as capable as the big names, but your chats stay private.
Good for
Not for
The free plan
How we decide: if a free plan scores at least 92% of Lumo Plus in the same independent tests, we call the free plan enough, the same rule as everywhere on this site. Read how we rank.