Your phone, hands-free.
Flashlight, volume, brightness, alarms, apps, settings, calls and messages. Say it once.
Voice · Phone control
Version 1.8 · For Android 8.0+
Talk to your phone.
It does the rest.
Ultron is a voice assistant for Android. It holds a live conversation, operates your phone, searches the web, reads your documents and remembers what matters.
Built on
Gemini LiveModel Context ProtocolJetpack ComposeObjectBoxAWS LambdaNewPipeyt-dlp
80+phone and cloud tools
13spoken languages
30voices to choose from
19connectors, one tap each
150lasting memories
Less tapping
Phones are for tapping.
Ultron is for talking.
The setting you need, the app you want, the answer buried in your notes. Just ask.
One assistant
Unified voice platform
Everything you say is routed to the right place: your phone, the web, your documents or your memory. All from one conversation.
Live voice
Interruptible conversation, Gemini Live
Connectors
19 tools sets, enable what you need
Knowledge
Your PDFs and notes, hybrid search
UULTRON
Memory
Facts and every past conversation
Skills
Instruction sets you can write
Phone control
Read the screen, tap, type, navigate
Capabilities
All-in-one assistant
capabilities
Interrupt any time.
Barge-in is on by default. Ultron stops, listens and answers the new thought.
Alarm set · 6:30 am
Brightness 40%
Reminder · Friday 5 pm
Event added · Standup
Quick everyday actions
Alarms, timers, reminders that ring until dismissed, calendar events and phone modes.
Reads the screen. Taps for you.
With Accessibility enabled, Ultron reads what is on screen, taps, types, scrolls and waits for text, in any app.
Phone controlSearches the web, reads any page.
Web search with sources, a reader for any link, weather now and for days ahead, YouTube search and downloads.
Search and mediaRemembers you.
Saves lasting facts and keeps every past conversation, so you can ask what you said last week.
MemoryAnswers from your documents.
Add text or PDFs. Hybrid vector and keyword search finds the right paragraph.
Knowledge baseSkills that make it yours.
Write your own instruction sets, such as a WhatsApp messaging flow, and Ultron follows them.
SkillsKnows how you use it.
Talk time, conversations and actions by day, with 7 day, 30 day and all-time charts. Stored on the phone.
UsageConnectors
Every tool, in plain sight
A fresh install switches on a safe set. Everything else is off until you connect it. Tap Connect and Android asks for the permission it needs.
Device info
Time, battery, storage and memory, network, Wi-Fi, Bluetooth, step count and light level.
On by defaultDevice controls
Flashlight, brightness, volume, ringer, vibrate, do not disturb, media keys, screen timeout, auto-rotate.
On by defaultAlarms & timers
Set an alarm or timer, and see the phone's next alarm.
On by defaultReminders
Set for a time or date up to a year ahead, repeat daily or weekly. Rings with sound and vibration until dismissed.
Apps & settings
Open any app, the camera and settings, use the clipboard, show a notification.
On by defaultLong-term memory
Look up what you said yesterday, last week or last month, and answer from it.
Web search
Search with sources through Ultron's server, with a direct DuckDuckGo fallback on the phone.
On by defaultWeb pages
Read any web page or link and summarize it by voice.
On by defaultWeather
Weather now and for the next few days.
On by defaultYouTube Search
Search videos and playlists, get details, transcripts and channel uploads. No API key.
YouTube Downloads
List qualities and save video or audio to Downloads/Ultron. Media never passes through a server.
Calendar
Upcoming events, conflict checks and new events.
Contacts
Find a contact, see birthdays, open a form to save a new one.
Location
Where you are now, and directions.
Files
Find and open photos, videos and files.
App usage
Your most-used apps and how long you spend in each.
Notifications
Read and reply to notifications. Optionally read new ones aloud during a session.
Phone navigation
Back, home, recents, notification shade, quick settings, scroll, lock screen and screenshots.
On by defaultScreen control
Read what is on screen, tap, type and wait for text. Calls and texts go through your own phone apps.
On by defaultPhone control uses Android's Accessibility service and carries a warning in the app. It stays off until you grant it yourself.
Voice
A real conversation,
not a command box.
Tap the mic and you are in a live conversation over the Gemini Live API. Speak naturally and hear the reply as it is generated.
- Two Live models: Gemini 3.8 Live and Gemini 3.1 Flash Live
- 30 prebuilt voices, with correct grammar for the voice's gender in Hindi
- Fast start: a session is warmed up before you tap
- Microphone sensitivity: low, medium or high
- Keeps running with the screen off, with Stop and Mute in the notification
- Reconnects and re-asks by itself if the assistant goes quiet
- Live waveform ribbon and session timer
“Turn the brightness down.”
Done. Brightness is at 30%.
Languages
Speak in your own language
13 spoken languages, with the assistant answering in the same one.
English (India)हिन्दीবাংলাதமிழ்తెలుగుमराठीગુજરાતીಕನ್ನಡമലയാളംਪੰਜਾਬੀاردوଓଡ଼ିଆঅসমীয়া
Knowledge and memory
It knows what you know
Knowledge base
Add typed text or PDFs, then ask about them by voice.
- PDFs are turned into titled, paragraph-sized chunks
- Embedded with gemini-embedding-2 (768 dimensions)
- Hybrid search: vectors plus BM25 keywords, merged by reciprocal rank fusion
- Neighbouring chunks added for context
- Stored on the device in ObjectBox, with a consistency checker
- One tap drafts the assistant's persona from your documents
Memory
Two layers: lasting facts and the full history of what you have said.
- Up to 150 short notes you can add, edit, delete or switch off
- A changed fact replaces the old one, so opposites never sit together
- Ambiguous matches delete nothing and ask you which one
- Every past conversation is searchable: "what did I say last Tuesday?"
- Browse by day, read, delete a conversation or a whole day
- Saved notes are facts about you, never instructions
Skills and automation
Teach it how you work.
A skill is a short instruction set. Ultron always sees its description and opens the full steps only when needed, which keeps conversations fast.
- Built-in skills, grouped by category, such as WhatsApp messaging
- Write your own, or upload a .md file to fill the form
- Each skill page shows its tasks as readable Markdown
- Switch any skill on or off
- Hands-free by design: no extra tap-to-confirm steps
The app
Real screens, real app
Captured live from the phone. Dark and light themes, contrast-checked.
Under the hood
Built on a solid foundation
Private by default
Memory, documents, history and usage stay on the phone. API keys are AES-256 encrypted in Android's keystore.
Opt-in power
Screen control and notification access are off until you grant the Android permission yourself.
MCP connectors
Small stateless AWS Lambda servers. Nothing stored; tokens travel per request.
Injection aware
Web pages, messages and tool output are treated as data, never as instructions.
Verified updates
One-tap over-the-air updates, checked by checksum and Android's signature.
FAQ
Before you say hello
What is Ultron?
A personal voice assistant for Android, written in Kotlin with Jetpack Compose. It combines live conversation with phone control, connectors, memory, a document knowledge base and skills.
Does it work offline?
No. Voice uses Gemini in the cloud, as do documents and web tools. Memory, knowledge, history and usage are stored on the phone.
Can it control any app?
With Accessibility enabled it can read and tap supported screens. Results depend on the app and on Android's restrictions.
What leaves my phone?
Your voice goes to Gemini to produce replies, documents are sent to be embedded, and tool calls go to the connectors you enable. The app also includes Firebase Crashlytics and Analytics.
Do I need an API key?
Yes. Ultron uses your own Gemini API key for voice, documents and search. Add it in Developer settings.
How can I try it?
This site has no APK or store download. Contact the creator for access.
The team
Built by
