BobBrain - On-device AI
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Everyone
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1+
Downloads
About this app
BobBrain runs Google's latest Gemma 4 language model entirely on your phone. No cloud round-trips, no data leaves the device for inference, and replies start streaming in milliseconds.
WHY ON-DEVICE
• Privacy: your conversations, voice notes, and images stay on your phone — never uploaded for inference
• Speed: token streaming starts almost instantly, no network latency
• Works offline: full AI assistant in airplane mode, on the metro, or on a flight
• One model, every BOB app: download Gemma 4 once and let other BOB apps share it (saves storage)
WHAT YOU CAN DO
• Chat with Gemma 4 by text, voice, or image — fully multimodal
• Send long voice notes — BobBrain transcribes and replies on-device
• Ask about photos you share — the model genuinely sees them
• Keep multiple conversations going; history is stored privately on your phone
FREE TIER
• Gemma 4 (2B parameter model)
• Unlimited text, voice, and image chat
• No ads, no tracking
PRO (7-DAY FREE TRIAL)
• Smarter Gemma 4 (4B parameter model) for harder questions
• Web Search tool — let the assistant look things up in real time
• Built-in tools — current date, time, calculator
• Device Control — control your phone by voice (with the BOB Control companion)
• Cancel any time in Google Play
WHY ON-DEVICE
• Privacy: your conversations, voice notes, and images stay on your phone — never uploaded for inference
• Speed: token streaming starts almost instantly, no network latency
• Works offline: full AI assistant in airplane mode, on the metro, or on a flight
• One model, every BOB app: download Gemma 4 once and let other BOB apps share it (saves storage)
WHAT YOU CAN DO
• Chat with Gemma 4 by text, voice, or image — fully multimodal
• Send long voice notes — BobBrain transcribes and replies on-device
• Ask about photos you share — the model genuinely sees them
• Keep multiple conversations going; history is stored privately on your phone
FREE TIER
• Gemma 4 (2B parameter model)
• Unlimited text, voice, and image chat
• No ads, no tracking
PRO (7-DAY FREE TRIAL)
• Smarter Gemma 4 (4B parameter model) for harder questions
• Web Search tool — let the assistant look things up in real time
• Built-in tools — current date, time, calculator
• Device Control — control your phone by voice (with the BOB Control companion)
• Cancel any time in Google Play
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
You can request that data be deleted
What’s new
Welcome to BobBrain — a private AI chat that runs entirely on your
phone. Your conversations never leave the device.
What's new in 1.4:
• Smarter web lookups — more accurate answers, fewer dead ends when
the assistant browses the web
• Pro now starts you off right: the Smarter 4B model and the Web
Browser + Calculator tools are enabled by default on your first day
• Faster paywall — no more waiting to dismiss it
• Browser reliability fixes during multi-step searches
phone. Your conversations never leave the device.
What's new in 1.4:
• Smarter web lookups — more accurate answers, fewer dead ends when
the assistant browses the web
• Pro now starts you off right: the Smarter 4B model and the Web
Browser + Calculator tools are enabled by default on your first day
• Faster paywall — no more waiting to dismiss it
• Browser reliability fixes during multi-step searches
App support
About the developer
BOB TOOLS LLP
dev@bob.tools
71-75 Shelton Street Covent Garden
LONDON
WC2H 9JQ
United Kingdom
+44 7458 164064
