# Lumo AI by Proton — user reviews > 505 indexed App Store user reviews of Lumo AI by Proton by Proton AG, rated 3.80/5 from 485 ratings. - Source: https://appshunter.io/ios/app/lumo-ai-by-proton/id6746714949/reviews - App overview in markdown: https://appshunter.io/ios/app/lumo-ai-by-proton/id6746714949.md - Rating breakdown: 5★ 256 · 4★ 67 · 3★ 55 · 2★ 43 · 1★ 64 ## What do users think of Lumo AI by Proton? Overall sentiment: negative **Pros** - 👍 Sophisticated knowledge base - 🚀 Rapid evolution with quality - 💡 Potential for vision-enabled model **Cons** - 🐛 Inability to answer basic questions - 🔒 Privacy concerns with data processing - 🐛 Inconsistent responses - 🐛 Frequent sign-outs - 🐛 Dark mode issues **Commonly reported bugs** - Slow sign-in page - Lack of real-time data access **Most requested features** - Dynamic Type support for adjustable font size - Secure access to Proton Drive files - Ghost mode to ensure no chat history is saved - Intuitive history clearing option - App mode ## Newest reviews (15 of 505) ### 4/5 — I miss lively Lumo. *2026-08-17* I wish I could keep Lumo out of the icon box in the loading screen, and make Lumo bigger and animated like it was before. Also, I really miss animated ghost Lumo. It’s purely aesthetic and has nothing to do with the functionality, but the liveliness of Lumo was a very important part of the app to me. It made the app feel much warmer and cosier than stark apps for bigger companies LLM. **Developer response:** Hi! Thank you for sharing your feedback. We'll make sure to forward it to our team so that it can be taken into consideration for future improvements. ### 3/5 — Recurso de Voz necessário *2026-08-15* O app tá até legal mais ele tá precisando de recurso de voz urgente, as vezes ele manda um texto enorme, que acaba dificultando o que eu tenho de fazer porque eu tenho que ficar com um olho lendo e o outro fazendo o que tenho de fazer **Developer response:** Thank you for your review. We've shared your request with the team for future consideration. You can follow our blog and our social media channels for any news and updates. ### 4/5 — No copying and pasting photos and files *2026-08-08, version 2.0.1* I wish Lumo allowed pasting photos straight to the app like Venice and other AIs; it would make life easier; sometimes I just want to paste a photo or PDF. ### 3/5 — Privacy at the cost of project capability - Lumo Conversation Limits *2026-08-06* 1. Unpredictable cessation Lumo stops responding when context memory reaches an unknown threshold, varying unpredictably between ~60% and ~80%. There is no warning indicator, making it impossible to anticipate when a conversation will fail. 2. No proactive handoff Users cannot ask Lumo to prepare a summary before it stops responding. By the time the limit is reached, the tool has already ceased functioning, leaving manual recovery as the only option. 3. Reactive recovery workflow When Lumo stops: Copy the last 2–3 messages from the failed conversation Paste them (as raw text, not a summary) into a new conversation in the same project Raw messages consume more tokens than summaries, giving the new conversation less available headroom from the start. 4. Progressively shrinking capacity Each successive conversation supports fewer exchanges before hitting the limit, as pasted content plus accumulated file tokens consume growing portions of the context window. This forces increasingly frequent restarts. 5. User bears the burden Managing these constraints—monitoring for unresponsiveness, copying content, restarting conversations—is manual and distracting, pulling focus from the actual project work. **Developer response:** We're sorry to hear that. Does this happen with the newest version of our Lumo service? Please contact us via the support form on our website with more details so we can investigate the issues further. ### 3/5 — Affichage Lumo ?! *2026-08-05* Cette IA pourrait être une bonne alternative à Chat GPT, Mistral …Mais l’affichage est tellement petit sur l’Iphone, il fatigue très rapidement ! Dommage car vous savez faire, inspirez-vous de l’affichage de Protonmail ou Protondrive qui sont bien mieux !! En attendant je reste avec Mistral **Developer response:** Thank you for sharing the feedback. We'll make sure to forward it to our team so that it can be taken into consideration for future improvements. ### 4/5 — Updated review: gotten a lot better. *2026-08-01* Huge improvements over the year. Memory is really good and the image generation is a nice addition. Hoping to see more integration into the proton ecosystem(mail, drive, etc). Also voices would be nice—I’m sure it’s coming. Subscribed for the year. It’s worth it imo **Developer response:** Thank you for your review. Dark mode is planned, so stay tuned for any news and updates on this. On another note, adding Lumo would require raising the price of our existing plans due to the cost of AI, and there are many paying users who would not use AI, so our current plan is to keep Lumo standalone rather than raising prices. Nonetheless, we've shared your feedback with the team accordingly. ### 5/5 — Recommend to everyone! *2026-07-29* Bug report unrelated to review: Hi Team, sorry to use the review section for this but I’m not digging through a hundred help articles to find where I can submit a ticket rn. I used up my weekly chat limit over a week ago (2+ actually) and it hasn’t reset. This came around the launch of lumo 2.0 (unrelated but I liked the old cat design better btw). I use lumo for everything so this has really affected my lifestyle. I how it can be resolved soon. Good day. Actual review: I used to use OpenAI but I found the suck-up-like answers to be a bit of a turn-off, and I really wanted more privacy. As soon as Lumo was developed, I downloaded it (already a big fan of proton for about 7 years), and it’s been great! I had to use ChatGPT and other a few times in the beginning months because lumo just wasn’t getting the full picture with my prompts… but not only has it caught up, it now gives me far better answers than the other AIs. ### 3/5 — Branding *2026-07-29, version 2.0.1* The staring cat is irritating, distracting and feels inappropriately cartoonish. Uninstalled. ### 5/5 — I Love Lumo! *2026-07-28* Love this app, finally a place I can have all my AI research together synced and of course, encrypted. Lumo 2.0 is very smart and I use it all the time to save time and effort when learning new things or doing new tasks. Wish the app would cache the chats, it takes sometimes like minutes to load (yes I have 1 gbps internet) and or I have to restart the app. I use the web version in FireFox more often than the iOS app for that reason. Wish we could run specific models and wish it was less censored. ### 5/5 — Privacy first *2026-07-26, version 2.0.1* The only AI tool I use. No data harvesting, personalization options allow for standardized output based on your own preferences, and it hasn’t failed me on a task yet. Enjoying the projects feature too. ### 4/5 — Pas d’intégration avec iOS et SIRI *2026-07-26* Dommage qu’il ne soit pas possible de faire une intégration avec SIRI et iOS . Pas de raccourci possible en automatisation. L’historique n’est gardé que 7 jours sinon il faut passer à la version payante. Je verrai dans les prochains mois pour les réponses données par cette IA À suivre …. **Developer response:** Thank you for your review. We've shared your request with the team for future consideration. You can follow our blog and our social media channels for any news and updates. Regarding the chats, please note that if the chats were created over 7 days ago, the chats on the Free Lumo Plan expire after that period of time. However, we do appreciate your feedback and it will be also shared with our team. ### 4/5 — text size is WAY too small on ipad *2026-07-25, version 2.0.1* even if I put 275% zoom the text size on iPad still looks like it’s 100% zoom. obviously I don’t need it to be gigantic like 275% zoom but.. it’s still too small and it should increase based on the zoom% (at least to a bigger size than the standard 100% zoom) ### 5/5 — Being Fast is not the Answer *2026-07-25, version 2.0.1* This AI platform takes its time to provide an analytical answer to an inquiry with few if any hiccups. A decent engine with an affordable price point, plus improvements with updates are pushed. Customer support responds to reviews which mean the company is willing to hear users feedback to factor adjustments with AI moving forward. ### 4/5 — good model but app worst of the lot *2026-07-24* you’ve made a big step up with the models but the app needs a lot of work, it doesn’t feel native or snappy, not sure how to explain further but it takes 5-10 seconds to go from the from the initial screen, me entering prompt and then i sit there waiting to being able to hit enter because it’s just got a microphone icon, then it “refreshes” and i can hit enter just weirdly feels more like a html app than a real one edit: just realised it’s taking like 10 seconds to load that’s why it feels slow to start, mistral vibe and claude are both pretty much instant in comparison **Developer response:** We're sorry to hear that. Please note that we'll make sure to share your feedback with the rest of our team so it can be taken into consideration. Also, we'd greatly appreciate it if you can contact us through the contact form on our website with more details and some screenshots so that our team can take a further look. ### 5/5 — Breaking through *2026-07-22, version 2.0.1* Lumo is the first online AI assistant I've used set up for privacy. Most truly private options exist as offline solutions, running locally with significant hardware requirements. Lumo breaks through with the next best level of privacy running on a cloud-hosted service. Every conversation is encrypted - meaning that even Proton can't read queries - with open source and verifiable code. There are no server-side logs, no quiet data harvesting, no model training on inputs. It's refreshing to use a capable AI tool with web search, image generation and document analysis knowing that data stays private by design. ## Most critical reviews (10 lowest-rated) ### 1/5 — Battery juice *2026-08-05* It is terrible because it drained the battery so hard, including when I was only reading the information! It is terrible, terrible and terrible!!! **Developer response:** That doesn't sound right. Why do you believe this is caused by the service? Have you received any error messages? Feel free to contact us through the contact form on our website so we can further investigate and properly assist you. ### 1/5 — Plus très convaincue. *2026-07-29* J’étais enthousiaste à l’annonce de cette IA, qui semblait se focaliser plutôt sur l’aspect recherche et « assistant » numérique, sans proposer de la génération d’image / vidéo comme bon nombre de ses concurrents, qui poussent de plus en plus à se reposer sur l’IA plutôt que de faire soi même. Lumo était unique, bien dosé entre recherche, écoute et propositions. L’IA s’adaptait plutôt bien au style et au rythme des conversations et les conversations pouvaient vraiment apporter de nouvelles perspectives sur les problématiques exposées. La promesse de garder les conversations privées et chiffrées semblait être tenue, en proposant tout de même la possibilité de mettre en « favoris » les conversations que l’on souhaitait garder malgré tout. L’équilibre entre privé et « accompagnement ». J’étais presque convaincue. Jusqu’à l’arrivée d’une mise à jour qui a rajouté à la fois la génération d’image / vidéo…Bon… admettons, même si ç’aurait été bien de se différencier des concurrents en axant plutôt sur ce qui faisait de Lumo unique en son genre, mais j’imagine que c’est plus simple de faire ainsi. Mais surtout, il semble que la mise à jour ait ajouté au système d’abonnement la possibilité de sauvegarder les conversations automatiquement, supprimant ainsi toutes celles de l’utilisation de base dans un délai de 7 jours, même celles mises en « favoris ». J’aurais été d’accord pour une durée plus longue, des rappels même, une limitation dans le nombre de messages envoyés, de longueur de conversations et tant d’autres alternatives qui auraient justifiés un abonnement, plutôt que juste un « payez ou vous recommencerez à zéro toutes les semaines ». Je résume en grossissant un peu le trait, mais les faits sont quand même là. On partait si bien pourtant, la promesse d’un équilibre entre privatif et accompagnement était belle… c’est franchement dommage. Ah et, d’ailleurs, « vos conversations vous appartiennent », n’est plus vraiment d’actualité du coup, puisqu’elles disparaissent au bout de 7 jours, sans possibilité de les récupérer ou d’inverser le processus sans payer. **Developer response:** Hi! Thank you for the feedback provided. Regarding your requests, it's important to note that we will make sure to add your votes for all the requested features and/or improvements so that our team is aware of the demand. ### 1/5 — Enter button missing *2026-07-26, version 2.0.1* Half the time the enter button never appears so app is unusable. Microphone button is always there though ### 1/5 — Franchement pas très intelligente et surtout écrit trop petit. *2026-07-22* Que cela soit sur l'application Web ou cette application iOS, on dirait qu'ils font en sorte qu'on ne puisse absolument pas lire ou s'abîmer les yeux tellement c'est écrit Petit ! De plus pas des réponses très intéressantes. **Developer response:** Thank you for your review. We've shared your request with the team for future consideration. You can follow our blog and our social media channels for any news and updates. ### 1/5 — Amazing ai *2026-07-21, version 2.0.1* If you want complete anonymity use the free version of the apps as you won’t link credit info. There you go higher level opsec. Update: 07.21.26 My saved chats have all disappeared!????! What happened with this latest update?! ### 1/5 — Bug ! *2026-07-16* Impossible de m’inscrire avec mon adresse proton ! Dois je ouvrir une autre boîte mail juste pour Lumo ? C’est nul !!! **Developer response:** This should not be the case. Are you certain you are entering the correct email address? Are you getting error messages in the process? Contact us through the support form on our website so we can better help. ### 1/5 — Unusable *2026-07-12, version 2.0.1* Tap mic button – immediate crash, app closes. Not occasionally, every time. If you cannot talk to your AI, it is not useful. It’s 2026 – why do we even have a text field anymore? (I’ll give it to you for odd spellings and exact numbers, but honestly … ) ### 1/5 — Lumps 1.0 *2026-07-11* I downloaded Lumos 1.0 when it came out and liked it just the way it was. Proton upgraded my app. I would like to have Lumos 1.0 back on my device. Is that possible? **Developer response:** Please reach out to us through the "Help and feedback" → "Report a problem" option under the account menu with more details about any issues you've experienced with the latest version of Lumo so we can help you further and make sure that everything is working smoothly. ### 1/5 — WTH *2026-07-06, version 2.0.0* Won’t let me download Lumos saying I have to enter my password in order to download it. I already have a subscription for proton. Why won’t it let me download? this is bs ### 1/5 — Network issue !? *2026-07-02, version 2.0.0* Unfortunately, the programme was working, but a network issue arose after the latest update; the fault lies with the company’s servers. Please resolve the issue ## Most praised reviews (10 highest-rated) ### 5/5 — Melhorou muito *2026-08-18* Pra quem usa o Lumo desde o começo ele evoluiu muito e a premissa dele de ter mais privacidade e nao ter suas conversas usadas pra treinar modelos é bem interessante ### 5/5 — Tolle KI-App – bei uns im Alltag angekommen. *2026-08-17* Ich hab Lumo 2.0 vor ein paar Wochen installiert und muss sagen, es hat sich schnell bei uns etabliert. Mit anderen KI-Chat-Apps hatte ich immer mein Problem beim Thema Datenschutz und den wöchentlichen Chat-Limits. Was für mich wichtig ist: Alles ist Ende-zu-Ende verschlüsselt. Bei uns kommen auch mal gesundheitliche Fragen rein oder Sachen zur Schule der Kinder – da will ich einfach nicht, dass irgendwer mitliest oder Daten weitergegeben werden. Mit Lumo 2.0 Lite mach ich die schnellen Sachen, kurze Fragen, kurze Texte, sowas. Geht fix und reicht völlig. Wenn's mal komplizierter wird, schalt ich auf Lumo 2.0 Max – das ist langsamer, aber dafür gründlicher. Bei Matheaufgaben vom Gymnasium meines Älteren oder wenn ich Arbeitsblätter vom jüngeren hochlad und mir was erklären lassen will, nehm ich Max. Der Speicher ist neu und extrem nützlich – Lumo weiß beim nächsten Chat noch, in welche Klasse die Kinder gehen und welche Schule. Ich muss das nicht jedesmal neu erzählen. Klingt klein, ist aber im Alltag echt praktisch. Spart auch Tokens weil der Kontext bekannt ist. Hört sich selbstverständlich an kann nicht jede Ki und explizit nicht so genau wie Lumo 2.0. Beruflich nutze ich es für Zusammenfassungen und Textarbeit, auch hier je nach Anspruch mal Lite, mal Max. Lange Gespräche werden automatisch zusammengefasst, Kontext geht nicht flöten. Nicht alles ist perfekt, manche Antworten könnten besser sein, insbesondere das Wetter und ab und an braucht Max einen Moment lang. Aber für mich ist es aktuell die beste KI-App, gerade weil ich das Gefühl hab, meine Daten sind safe und ich hab noch nie die Limits aufgebraucht. ### 5/5 — Privacy first that earns your trust *2026-08-17* If you value privacy and ethical tech, Lumo is a no-brainer. It may not be the most feature-packed or powerful LLM out there, and the UX has room to grow, but that's not the point. What sets Lumo apart is what's happening behind the scenes: your data isn't being mined, scraped, or used to train models. You're not the product. As a Proton user, subscribing is a given, the Plus plan is genuinely reasonable, there's no cap, and it pays off. The key is to invest time upfront: set up your projects and structure your work. Do that, and Lumo's responses are excellent. It's not trying to be everything to everyone, and that honesty is refreshing. If protecting your data matters to you (and it should), this is the best AI assistant available. ### 5/5 — Super *2026-08-13* Cette intelligence artificielle a fait du progrès mais l’époque où le chargement été un petit sablier était bien 👍 continuer comme ça ### 5/5 — Lumo Evolved!! ⚡️ *2026-08-11* At first Lumo felt pretty basic and clunky, especially with the UI. But version 2.0 with projects and custom agents is a solid upgrade! I gotta say its internal training is also substantially better in a lot of areas you’d least expect it. You can have massive outputs without truncation or having the model overly redirect and reframe the conversations for further engagement. That last part is a solid win if you want a forensic level thinking partner and not a chat bot. When you add this, the persistent memory, and the fact that it’s fully private—it’s a huge win! ### 5/5 — Richtig gut 👍 *2026-08-04* Seit dem letzten Update sind die Antworten noch einmal sehr viel besser geworden. Im direkten Vergleich mit Claude ist Lumo nach meinem Geschmack sogar besser als Claude oder ChatGPT, wenn die Fragen oder Analysen nicht hoch komplex sind. Aber 90% meiner Arbeit mache ich ausschließlich mit Lumo (PRO) ### 5/5 — Excellent with privacy baked in *2026-08-04, version 2.0.1* Overall extremely happy with the experience. The functionality is great answers usually on par with frontier models, slightly fewer features but importantly end to end encryption. Decent UX, I’d love a Mac app, but the iPhone app and web work very well. ### 5/5 — Private KI als Alleinstellungsmerkmal *2026-08-03* Ich freue mich wirklich sehr über die KI die Privatsphäre und Datenschutz wahrt. In der heutigen Zeit gibt man echt viel persönliches ein und überlegt gar nicht mehr wo man es grad schreibt. Klar bei einfachen unkritischen Sachen ist es auch bei US Unternehmen nicht so problematisch, aber manchmal will man auch privates schreiben oder Dokumente erklären lassen. Hier ist es ein super Mechanismus der die Daten schützt und wird bisher auch von allen anderen KIs gelobt 🙃 allerdings ist es auch so, dass es zwar schon echt gut ist der Output, aber ChatGPT immer noch viel schneller, kreativer und wissender. Aber auch E2EE hat bei der Geschwindigkeit sein Preis. Ich habe auf plus abonniert, schon alleine weil ich das Projekt unterstütze. Ein Live Sprachmodus wäre wirklich auch noch top 👍 ### 5/5 — Petite idée pour améliorer *2026-08-02* Alors pour commencer j’ai découvert proton récemment et j’ai pour but de tout transférer dessus que ça soit pour mes e-mails pour mon VPN pour mes documents. Bref la totale et j’ai 2-3 idées qui peuvent améliorer l’application pour commencer avoir la possibilité de personnaliser l’interface, surtout la taille de la police parce que de mon côté ça me paraît très et surtout d’avoir une sorte de live Voice comme sur Gemini le fait de se parler ce qui est vachement important et utile mais sinon c’est parfait ### 5/5 — text size is WAY too small on ipad *2026-08-02* 1. even if I put 275% zoom the text size on iPad still looks like it’s 100% zoom. obviously I don’t need it to be gigantic like 275% zoom but.. it’s still too small and it should increase based on the zoom% (at least to a bigger size than the standard 100% zoom) 2. please add A copy button for my own prompts, not just edit. Right now tapping my own message only gives a pencil icon to edit it. Most other AI apps let you copy your own prompt text too, which is handy when you want to reuse or tweak it somewhere else. **Developer response:** Thank you for your review. We've shared your request with the team for future consideration. You can follow our blog and our social media channels for any news and updates. --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-29.*