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Hain
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Hain app icon: Pim, a glossy green glass figure, in a soft forest

Version 0.2 · early version

Your AI. Your phone. Nobody else.

Hain is a free AI assistant for Android that runs on your phone. No account, no cloud, no ads, no tracking.

Download the APK How to install

Free · Open source · Android 10 or newer

Hain is not in the Play Store. You install the APK from GitHub and allow your browser once to install apps (“unknown sources”). How to install

  • No account
  • No cloud
  • No ads
  • No tracking
  • No Google services
Hain’s start page: Pim says hello and suggests a few questions

Why Hain

A helpful AI that stays with you.

Most AI apps send everything you type to big data centres. Hain thinks right on your phone.

  • Private

    Your questions and chats stay on your phone. Nobody reads along, and nothing is used to train an AI.

  • Works offline

    Chatting works without internet, even on a plane. Hain only goes online when you ask for something from the web.

  • Free

    No ads, no hidden costs. Hain is open source and belongs to everyone.

  • Green

    No data centre has to run for your questions. Hain uses the phone you already own.

Features

What Hain 0.2 can do.

Every feature once, with a real screenshot of the app. The examples in the pictures are made up.

Since 0.1 was already in the 0.1 test versionsNew in 0.2 came on the way to 0.2Planned not in the app yet, see below
  1. Since 0.1

    Hello, I’m Pim

    A short welcome tour with Pim, then Hain downloads its brain once (about 1 GB, Wi-Fi is best). The download can wait, picks up where it stopped and runs in the background. After that, chatting works without internet.

    Welcome screen with Pim
  2. Since 0.1

    Chat that stays on your phone

    Answers appear as they are written, with lists, tables and code. Stop at once, copy, share, rate or ask again. The AI runs on your phone, even in flight mode. Small models know less than the big cloud AIs, so check important answers.

    A long answer with a table and code
  3. Since 0.1

    Fast, Auto or Thorough

    Pick in the message box how much effort Pim puts in. Fast answers at once, Thorough takes longer and searches more for hard questions, Auto decides for you.

    The thinking level picker in the message box
  4. New in 0.2

    Choose the brain

    The standard brain is LFM3 1.7B (about 1 GB), which thinks out loud when a question needs it. LFM3-Omni 2B (also about 1 GB) is optional: it does not think out loud and calls fewer unneeded tools. Phones with 8 GB of memory or more can add the optional big brain Jan-v3.5 4B (2.7 GB): it picks tools more reliably but answers clearly slower. Each brain says plainly what it is good at; switch any time with a tap on “Hain” at the top of the chat.

    Models & packs, Brains: LFM3 1.7B, LFM3-Omni 2B and Jan-v3.5 4B, each with a short assessment
  5. Since 0.1

    Pim looks it up

    Weather from Open-Meteo, Wikipedia in German and English and a web search without account or API key. Each step shows under the answer, folded into one quiet line (“3 tools used”) that opens with a tap, with the sources. New in 0.2: weather and Wikipedia cards, site icons at the sources, and tools only come up when your question asks for them.

    Answer with weather card, steps and sources
  6. Since 0.1

    Research with every step

    For harder questions Pim searches the web, reads several pages at once and writes from them. You see what it searched and which pages it read, and you can stop at any time. Exact maths and units are calculated, not guessed.

    Pim searched the web and read three pages, the answer is being written
  7. Since 0.1

    Phone actions, always with your OK

    Alarm (also every weekday), timer, calendar entry and directions. Pim only prepares a card; your clock, calendar or map app opens after your tap. New in 0.2: repeating alarms, and if you like, a 3-second countdown with Undo instead of the tap.

    Cards for a weekday alarm and a timer, waiting for a tap
  8. New in 0.2

    Cards in the answer

    For plans, lists and comparisons Pim answers with a calm card: table, checklist to tick off, progress bar, bar or line chart and buttons. Ticks stay with the chat.

    A study plan as a card with a table, a checklist and a progress bar
  9. New in 0.2

    Pim remembers – if you want

    “Remember that I’m vegetarian.” Pim keeps what you say about yourself on your phone and uses it when it fits. Under the answer you see which memories it used, and “Remember: …” offers new ones with one tap. See, change or delete everything in Settings → Memory.

    Answer with the chips “Remember: is learning Spanish” and “2 memories used”
  10. New in 0.2

    Ask your PDFs and photos

    Attach a PDF, a photo of a page or a text file with the paper clip, or share it from another app. Hain reads the text on your phone (text recognition for scans as an optional pack) and Pim answers with the page.

    A manual attached as PDF, Pim answers with page numbers
  11. New in 0.2

    Your news, calmly

    A news reader with pictures: 19 sources in German and English, plus your own feeds if you like. Your briefing of the day is picked and summed up on your phone, and you see each step while it is made.

    News with the briefing card loading feeds 7 of 19
  12. New in 0.2

    Read in Hain and ask Pim

    Articles open in a clean reading view with adjustable text. Ask Pim to sum up or explain an article; it answers only from that article, on your phone. Paywalls stay paywalls.

    An article in the reading view
  13. New in 0.2

    Nothing gets lost

    Edit a message or ask again and the old version stays: switch with ‹ 2/3 ›. Send your next question while Pim is still answering; it waits its turn.

    Versions 2/2 and 3/3 and a waiting question
  14. Since 0.1

    Your chats stay – encrypted

    Chats are stored encrypted, only on your phone. Search, rename, pin and delete them, with automatic titles. New in 0.2: export one chat as Markdown or PDF, or all at once as a ZIP.

    The chat list in the side panel
  15. New in 0.2

    Private chat, app lock, network log

    A private chat is never saved and gone when you leave it. Lock Hain with fingerprint or PIN and block screenshots. Every request to the internet is listed, and one switch on the Internet page turns all of it off. The network log has been there since 0.1; the rest is new.

    The Internet page: one main switch and what may go online
  16. New in 0.2

    Wikipedia without internet

    Models & packs sorts everything you can download: Wikipedia for your phone (German from about 140 MB), brains, text recognition, search by meaning and voice. Each pack says what it brings and whether it fits your phone.

    Wikipedia packs in Models & packs
  17. New in 0.2

    Speak instead of typing

    Tap or hold the mic and speak; dictation runs fully on your phone (German and English, a small pack per language). Pim can read answers aloud, for now with your phone’s own voice.

    Dictation packs for German and English and the read-aloud note
  18. Since 0.1

    Your look

    Light or dark, an easy-to-read font, app icon, vibration and reduce motion. Answer style and a few words about you are in Settings too.

    Settings page Look
  19. New in 0.2

    Tablets and wide screens

    On a tablet the chat list stays open on the left. Settings, Models & packs, Memory and News use the extra room.

    Hain on a tablet: chat list on the left, chat on the right

Also in 0.2

Smaller things without their own picture.
  • New in 0.2

    Share, widget & quick tile

    Share text, links, PDFs or photos from any app into a new chat. A home screen widget “Ask Pim” and a quick tile “New chat”.

  • Since 0.1

    Speaks your language

    Pim answers in the language you write in, or always in German or English.

  • New in 0.2

    Update check (optional)

    Off until you say yes. Then Hain asks GitHub once a day for a new version and shows a calm hint. Nothing installs by itself.

  • New in 0.2

    Quicker start

    Pim’s fixed instructions are kept after the first read, so the first answer after opening Hain comes sooner.

  • New in 0.2

    Developer mode

    Hidden for tinkerers: tap the version 7 times. Try your own GGUF model, tune sampling, see tokens per second.

  • New in 0.2

    Open-source licences

    Settings → About Hain lists every library, AI model, font and icon set Hain uses, with version and licence. A tap shows the full licence text, right in the app and offline.

  • Since 0.1

    A secret

    Hold Pim on the start page for 5 seconds … (hint: 2048).

Planned

What comes next.

None of this is in the app yet. It is in Hain’s concept and plan, without dates.

Next: 0.3

Planned for the next version
  • Planned

    Mini-apps in Pim’s forest

    Small helpers without keys, for example local transport, that grow as trees in Pim’s forest.

  • Planned

    Edit photos

    Erase objects, remove the background, make photos sharper – on your phone.

  • Planned

    Voice mode

    Talk with Pim hands-free, back and forth.

  • Planned

    F-Droid

    Hain in the F-Droid app store, so updates come by themselves.

Later

In the concept, no version yet
  • Planned

    Photos and audio with Omni

    “What is this?” or “Explain this maths problem”: the Omni brain can understand pictures and sound with an extra pack.

  • Planned

    Pim’s own voice

    Read aloud in Pim’s own voice instead of the phone’s voice.

  • Planned

    Pictures in answers

    Answer cards that can show pictures, too.

  • Planned

    Create images (optional)

    An optional pack for phones with 8 GB of memory or more. Nice for sketches and ideas, far weaker than the big cloud AIs.

  • Planned

    Hain as your phone assistant

    Start Hain like a phone assistant and ask about what is on your screen.

Plans can change. Roadmap on GitHub · Concept (German)

Install

Ready in three steps.

Hain is not in the Play Store. You install it directly from GitHub, which takes about two minutes.

  1. 1. Download the APK

    Open the download page on your phone. Under “Assets”, tap the file that ends in “.apk”.

  2. 2. Install it

    Open the file. Android asks if your browser may install apps. Allow it once, then tap “Install”.

  3. 3. Get the brain

    On first start Hain downloads its brain (about 1 GB). Wi-Fi is best. After that, chatting works offline.

Download the APK

You need Android 10 or newer and at least 4 GB of RAM; 6 GB or more is recommended.

Help: “Install unknown apps”, step by step

Android protects you from apps that don’t come from the Play Store. That is good. To install Hain, you allow it once for your browser:

  1. 1Tap the downloaded APK file (in the browser or in your “Downloads”).
  2. 2Android shows a message like “For your security, your phone is not allowed to install unknown apps from this source.” Tap “Settings”.
  3. 3Turn on “Allow from this source”.
  4. 4Go back and tap “Install”. Done!
  5. 5Optional: turn the switch off again afterwards. Hain keeps working.

The exact words differ a little between phone brands. If Google Play Protect warns you, tap “More details” and “Install anyway”. Hain is open source, so anyone can check the code. Already have a test version? Install the new APK over it; your chats stay.

Privacy

Privacy, explained simply.

No fine print. Here is exactly what happens with your data.

Always stays on your phone

  • Your questions and Hain’s answers
  • Your saved chats (encrypted)
  • What Hain remembers about you
  • Your documents (only their text, encrypted)
  • Your settings

Goes online only when you ask

  • Weather, Wikipedia, web search, news
  • Downloading the brain and packs
  • Every request is listed, so you can see where it went

Where requests go

Example
  • Weather tomorrowopen-meteo.com
  • Wikipedia: Eiffel Towerwikipedia.org
  • Brain downloadhuggingface.co

Never: no account, no analytics, no ads, no Google Play Services, no Firebase.

Compared

Hain or a cloud AI?

An honest comparison. Cloud AIs are smarter and know more. Hain is private and yours.

  • Where the AI thinksHainOn your phoneTypical cloud AIIn a data centre
  • Account neededHainNoTypical cloud AIUsually yes
  • Who sees your chatsHainOnly youTypical cloud AIThe company can store them
  • Ads and trackingHainNoneTypical cloud AIDepends on the company
  • Works without internetHainYes, for chattingTypical cloud AINo
  • PriceHainFreeTypical cloud AIFree with limits, or paid
  • Knowledge and smartsHainSmaller, looks things up onlineTypical cloud AIMuch bigger
  • SpeedHainDepends on your phoneTypical cloud AIUsually fast

Hain uses a small open language model. It knows less than the big ones, so for facts it looks things up on the web when you allow it.

FAQ

Questions? Answers.

Why do I have to allow “unknown sources”?

Hain is not in the Play Store, so Android asks once if your browser may install it. That is a normal safety question. The step-by-step help above shows how. You can turn the switch off again afterwards.

Is Hain safe?

Hain is open source: anyone can read the code on GitHub. It has no ads, no trackers and no Google services, and your chats stay on your phone. It is still an early version, so it can crash, and things may change between versions.

Does Hain need the internet?

Only once to download the brain (about 1 GB). After that, chatting works offline. Hain only goes online when you ask for something from the web, like the weather or a search, and it shows you where the request goes.

Which phone do I need?

An Android phone with Android 10 or newer and at least 4 GB of RAM; 6 GB or more is recommended, 8 GB or more for the optional big brain. The newer your phone, the faster Hain answers. iPhones are not supported.

What does it cost?

Nothing. Hain is free and has no ads. The app is open source under the GPL-3.0 licence.

Which licences do the brains have?

The standard brain LFM3 1.7B and the optional LFM3-Omni 2B are under the LFM Open License v1.0, the optional big brain Jan-v3.5 4B under Apache-2.0. Wikipedia packs are CC BY-SA 4.0. Every licence text is in the app under Settings → About Hain → Open-source licences, and in the repository.

How do I update Hain?

Download the newest APK from the same download page and install it over the old one; your chats stay. If you like, Hain can check once a day whether a new version is out (off until you say yes).

Can the AI make mistakes?

Yes. Like every AI, Hain can be wrong, make things up or sound more sure than it is. Please check important answers, especially about health, money or law. Hain does not replace a doctor, a lawyer or therapy.

Is Hain made with AI?

Partly. Hain is made by one person, Oskar, together with AI coding agents. Every change is checked, tested and merged by a human.

Get involved

Help Hain grow.

You don’t need to code. Trying Hain and telling us what you think helps a lot.

About AI: Hain’s AI can be wrong. Check important answers. Hain is developed with the help of AI coding agents, and every change is reviewed by a human.

Your AI. Your phone. Nobody else.

Download the APK GitHub

Free · Open source · Android 10 or newer