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CompactifAI APP Review: Free Chat App with Offline and Cloud Models

·6 min readBy Hans Kuepper · Founder of PromptQuorum · Discovery engine for open-weight & open-source AI

CompactifAI APP is a free, closed-source chat app from Multiverse Computing that, according to the maker, combines compressed on-device models with cloud models from its own API. The current store text (version 2.10) describes only the API models, so what runs on the phone today is unverified.

Key Takeaways

  • Maker: Multiverse Computing, headquartered in Donostia, Spain; the App Store shows a first release on 2 March 2026 and the launch announcement is dated 3 March 2026.
  • Reach: Google Play shows 5K+ downloads; the US App Store listing shows no ratings yet.
  • Platforms: iPhone and iPad (iOS and iPadOS 16.4 or later) and Android; the App Store lists English as the only language.
  • Website: the maker's CompactifAI APP page links both stores.

📍 In One Sentence

CompactifAI APP is a free, closed-source chat app for iPhone, iPad and Android from Multiverse Computing that offers compressed models for offline use and larger models through the maker's cloud API.

💬 In Plain Terms

You install it from the App Store or Google Play and pick a model. Some models are meant to run on the phone itself; others are hosted by Multiverse Computing and need an internet connection.

📌Note: This review is based on the store listings, Apple's lookup data, the maker's website and its published announcements, checked on 24 October 2026. It involved no installation, hands-on use, network inspection or benchmarking.

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CompactifAI APP is a free chat app for iPhone, iPad and Android from Multiverse Computing, a Spain-based company focused on compressed AI models. According to the maker, it can run compressed models on the device without internet or use larger models through the company's cloud API. This review reflects the store listings, the maker's website and its announcements, as checked on 24 October 2026.

CompactifAI APP Review: Free Chat App with Offline and Cloud Models

What Is CompactifAI APP?

CompactifAI APP is Multiverse Computing's mobile chat app for trying the company's own models. The store text says it brings the maker's portfolio of models "together in one streamlined and intuitive interface" so users can compare them and choose one per task. The App Store shows the seller as MULTIVERSE COMPUTING SL. and the title "CompactifAI".

CompactifAI is also the name of the company's model-compression technology and of its separate cloud API; the app is a third product that lists models available on that API.

Where Your Chats Run

CompactifAI APP is hybrid, not purely local: according to the maker, where a chat runs depends on which model you use.

  • On the phone (maker statements). The website says the models are "optimized to run locally on your device — even without an internet connection", and the March 2026 announcement says users can download models and work fully offline. A November 2025 blog post from the maker describes an on-device Llama 3.1 8B Slim model in a demo. No list of the on-device models in version 2.10 was found.
  • In the cloud. The announcement says users can switch to cloud models through the API, and the version 2.10 store text says the app gives access to Multiverse Computing's models "through our API", naming Quasar 438B and GLM 5.3. Requests to those models go to the maker's API.
  • Routing. The announcement describes "smart query routing" between on-device and API models. The 2.10 store text speaks of choosing among models and does not say whether automatic routing still exists.

Get It

Platform
Where to get it
iPhone and iPadApp Store (free download, iOS or iPadOS 16.4 or later)
AndroidGoogle Play (free download, 5K+ downloads)
WebsiteCompactifAI APP page (links both stores)
Privacy policyPrivacy policy (general policy, no date shown)

Version reviewed: 2.10.4 on Google Play, last updated on 11 September 2026; the App Store shows 2.10.0, released on 8 September 2026. A lookup by app ID found the App Store listing in the US, German, French, Spanish, Japanese, Korean, Brazilian, UK, Canadian, Australian and Indian storefronts, but not in the Saudi or Chinese ones. The maker's site tells readers to contact it if the app is not available in their region.

Pricing

The app is a free download on both stores, and no subscription, paid tier or in-app purchase was found in the sources checked.

The listings do not say what, if anything, using the API-hosted models costs.

Features Listed by the Maker

Everything below comes from the store text, release notes and announcements; none of it was tested.

  • Model access. One interface for the maker's models. Version 2.10.0 added Quasar 438B, which the maker calls its flagship reasoning model, and GLM 5.3, and now lists every chat model on Multiverse Computing's API, with new ones added as released.
  • Interface. Redesigned onboarding and model selection in version 2.10.0, plus "faster, more consistent responses".
  • Maker claims. The March 2026 announcement says the compression technology shrinks models by up to 95% with a precision loss of 2-3%, and the 2.10 release notes call Quasar 438B "Europe's best-scoring AI model according to independent benchmarks by Artificial Analysis". Both are the maker's statements; PromptQuorum did not check them.

Privacy and Data Flow

The two stores describe data collection differently. The App Store privacy label says "Data Not Collected". The Google Play data-safety form says the app may collect name and email address (for app functionality and account management) and may share crash logs and approximate location with third parties for analytics; it adds that data is encrypted in transit and that deletion can be requested.

The privacy policy linked from the App Store is the company's general policy for its website and mobile apps, and it does not describe this app's on-device or API data flow separately.

📌Note: The app is closed source, so none of these statements can be checked in code, and PromptQuorum has not inspected network traffic. Anyone using the API models should assume the prompts leave the phone, and should confirm in the app which data stays on it.

Who Should Use It

  • Phone users who want to try Multiverse Computing's models in one free app and compare several.
  • Readers interested in model compression, the company's specialty, who accept that the on-device part is unverified.
  • People who may need AI with weak connectivity, the use case the maker names, but only after confirming in the installed app that a model really runs offline.

What We Could Not Verify

  • Hands-on behavior. The app was not installed, so answer quality, speed, battery use and offline operation were not tested.
  • The on-device models in version 2.10. The listings name no local model, download size, storage need or device requirement.
  • Routing and model choice. Whether the app picks between local and API models automatically, or the user does, is not stated for version 2.10.
  • Accounts. The Google Play form lists name and email for account management; whether an account is required is not stated.
  • Independent feedback. The US App Store listing shows no ratings, so no public user reports on the iPhone version were found.
  • Source code and languages. No public repository was found, and the App Store lists English as the only language.

Competitors and Alternatives

LM Mini

Platforms:
iOS, iPadOS, macOS
Price / license:
Free + purchases / Closed source
Key difference:
On-device models plus your own LM Studio or Ollama server
Articles about LM Mini (1)

Enchanted

Platforms:
iOS, macOS
Price / license:
Free / Apache 2.0
Key difference:
Ollama-only client with no models of its own
Articles about Enchanted (4)

Also mentioned in:

+7 more not shown

Competitor details change often; confirm each app's current price, license and platforms on its own listing.

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Frequently Asked Questions

Is CompactifAI APP the same as the CompactifAI API?

No. The API is the maker's separate developer service for compressed models; the app is a free mobile client whose 2.10 release notes say it lists every chat model on that API.

Which languages does CompactifAI APP support?

The App Store lists English only. For Quasar 438B, the store text says English and Spanish.

How does it differ from open-source offline phone apps?

It is closed source and built around the maker's own models, whereas apps such as PocketPal AI and Private Mind are open source and let you download models from public libraries.

Verdict

CompactifAI APP is an actively updated, free phone client from a company that specializes in compressed models. Its limits are a closed-source codebase, current store text that describes API models but not offline use, an unlisted on-device model set and no independent tests. It suits readers who want to try Multiverse Computing's models; anyone who needs a fully on-device, open-source app should compare Private Mind or PocketPal AI.

Sources

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