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GreenCube Review: One-Time-Purchase Offline AI for Windows

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

GreenCube (version 0.1.47, updated 17 October 2026) is a Windows 10 and 11 app that runs Gemma 4 on your own PC and, according to its maker, keeps chats, files and images on the machine. It is closed source and Windows-only. PromptQuorum has not installed or tested it; every statement here comes from the maker's website, its installer feed and its privacy policy.

Key Takeaways

  • Maintenance: the latest build, 0.1.47, was published on 17 October 2026, so no stale-project warning applies.
  • Cost: one payment with no renewal; the website offers a full refund within 15 days on request.
  • Device: Windows 10 or 11 with 8 GB of RAM or more; there is no macOS or Linux version.
  • Models: Gemma 4 E2B or E4B, picked by your hardware tier.
  • Transparency: closed source, a 0.x version number and a company publisher (Edunexis SL, Spain).

📍 In One Sentence

GreenCube is a Windows desktop AI sold once for 9.99 euros that runs Gemma 4 on your own PC and works offline after the first download.

💬 In Plain Terms

You buy it once, sign in, let it download a model of a few gigabytes, and from then on chat, code and read files on your PC without a subscription or usage limit.

📌Note: This review is based on the maker's website, installer feed and privacy policy, checked on 30 October 2026. PromptQuorum has not installed, tested or benchmarked the app.

Read in:
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GreenCube is a Windows desktop app that runs Google's Gemma 4 models on your own PC for chat, coding, image generation and reading files, sold for a single payment of 9.99 euros instead of a subscription. It is a young product (version 0.1.47, updated on 17 October 2026) from a Spanish company, so this review sticks to what its website, installer feed and privacy policy say, as checked on 30 October 2026.

GreenCube Review: One-Time-Purchase Offline AI for Windows

What Is GreenCube?

GreenCube is a desktop AI assistant that runs on your own Windows PC, with no message limit, no credits and no monthly fee. The website lists chat and writing, code and web-page generation, image generation, reading PDFs and photos, and study tools such as flashcards and quizzes, plus export to PowerPoint and Word. Diagrams and Automations are shown as coming soon.

It is published by Edunexis SL of Cartagena, Spain, under the product name GreenCube. The maker's own FAQ is candid about the trade-off: the biggest cloud AIs are smarter, and GreenCube offers no limits, offline use and ownership instead.

Get It

GreenCube is a normal Windows installer download; the sources mention no terminal step, only a sign-in and a one-time model download.

Item
Details
PlatformWindows 10 and 11
DownloadGreenCube-setup.exe
Price€9.99 (US$9.99), paid once
Websitegreencube.app
Privacy policyGreenCube privacy policy
Source codeNone found for the app

Version reviewed: 0.1.47, published on 17 October 2026 per the maker's update feed. The purchase page's structured data says "1.0", which does not match the feed; this review follows the feed because it describes the build users receive. The only public repository of the maker's GitHub organization is the website, not the app.

Requirements and Hardware Tiers

GreenCube needs Windows 10 or 11 and about 8 GB of RAM; memory decides how much fits and a graphics card decides how fast it runs.

Tier
What the website says
SeedAbout 8 GB RAM, no graphics card
Sprout16 GB RAM or more without a card, or 8 GB with a card
BloomCard with 8 GB or more, or a 4 GB card with 16 GB RAM
ThriveCard with 8 GB or more and 24 GB RAM or more

Without a graphics card it works but is slower. Image generation needs at least 12 GB of RAM. The installer is 14.1 MB; the model download adds a few gigabytes.

How to Get Started

The steps follow the maker's website; PromptQuorum has not run them.

  1. 1
    Buy a licence
    Why it matters: Pay once on the [purchase page](https://greencube.app/buy); the account is used to check payment.
  2. 2
    Install the app
    Why it matters: Download and run the Windows installer on a Windows 10 or 11 PC with 8 GB of RAM or more.
  3. 3
    Sign in and download the model
    Why it matters: Sign in with Google or Microsoft; the app then downloads the model for your hardware tier, which takes a few gigabytes.
  4. 4
    Work offline
    Why it matters: After the download, chat, code and file reading run without a connection.
  5. 5
    Decide about Online
    Why it matters: Switch the Online option on only if you want web searches; it is off otherwise.

Features Confirmed by the Sources

Every item below comes from the maker's website.

  • Chat and files. Chat plus reading of PDFs, photos and screenshots.
  • Code and web pages. Builds apps, sites and games from a description.
  • Images. Image generation on machines with at least 12 GB of RAM.
  • Study and export. Flashcards, quizzes, tables, and PowerPoint and Word export.
  • Languages. The website itself is offered in about 20 languages; which languages the model answers well in is not stated.

Data Flow and Content Policy

Per the privacy policy, conversations, documents, images, memories and settings are created and stored on your computer, and the maker says it never receives them. What the company does handle is the purchase (email, name, billing country, payment details via Stripe), the sign-in with Google or Microsoft, and download-server logs when models or updates are fetched. Purchase records are kept for six years under Spanish tax law.

The app keeps diagnostic logs on your PC that are designed to leave out conversations, although file names can appear, and they reach the maker only if you send them. On content, the website says GreenCube adds no filter of its own and steers its models to answer candidly without retraining them, so they can still refuse; it will not help with harm to people, child exploitation, theft or account break-ins, and the candid-answer setting can be turned off.

📌Note: These are the maker's own statements; PromptQuorum has not audited the app's network traffic or confirmed that nothing else leaves the PC.

Who Should Use It

  • Windows users who dislike subscriptions and want to pay once for a local assistant.
  • People who want to ask questions about their own files without uploading them, per the maker.
  • Owners of ordinary PCs, since the lowest tier needs 8 GB of RAM and no graphics card.

What We Could Not Verify

  • Hands-on quality. PromptQuorum did not run the app, so answer quality, speed and image results are not assessed.
  • Runtime and models. Only Gemma 4 E2B and E4B are named; no public source names the inference engine or lists other models.
  • Version and age. The feed says 0.1.47 while the purchase page says 1.0, and no changelog or release history is published.
  • Independent checks. The app has no public source code and no third-party review of its network traffic or its content settings.

Competitors and Alternatives

GPT4All

Platforms:
Windows, macOS, Linux
Price / license:
Free / MIT
Key difference:
Beginner-friendly open-source desktop chat with strong CPU-only support
Articles about GPT4All (10)

+19 more not shown

Msty

Platforms:
Windows, macOS, Linux
Price / license:
Freemium / closed source
Key difference:
Consumer-style desktop client with multi-provider support, local or cloud
Articles about Msty (8)

Also mentioned in:

+8 more not shown

Hanoki

Platforms:
macOS
Price / license:
Freemium / MIT
Key difference:
Branching chat for Mac, local via Ollama or cloud APIs; no Windows version
Articles about Hanoki (2)

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

Compare in directory

Frequently Asked Questions

Is there a refund?

The website says you have 15 days to change your mind and get a full refund by emailing support@greencube.app.

Why does it need an account?

Only to verify the payment, according to the website; the account is not used for chats, files or images.

Can I try it for free first?

The sources mention no free tier or trial; the refund window is the stated safety net.

Is there a pro version?

No. The website says there is one version at one price and that a faster computer only runs it faster.

Verdict

GreenCube is a Windows desktop AI that, by its maker's account, runs Gemma 4 on your own PC, works offline after the first download and costs a single payment. Against that, it is Windows-only, closed source, still on a 0.x version, and PromptQuorum could not verify its quality or network behaviour. It suits Windows users who want to avoid subscriptions and accept those limits; readers who want open-source code can compare GPT4All or Jan.

Sources

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