Hello, I'm Subrata.
Indie Developer & Creator of Subra Space AI
1. The broken promise of modern health technology
Over the past few years, we have seen almost every digital tool get locked behind mandatory subscriptions. Worse, health and productivity apps started demanding that you upload your blood pressure scans, doctor notes, and family records to remote cloud servers — where your most intimate data gets processed, profiled, and in many cases monetized for targeted ads or insurance assessments.
I built Subra Space AI because I firmly believe:
2. One Space in every category is free — for your entire life
Most companies give you a “free trial” that expires after 7 or 14 days, effectively taking your medical and personal logs hostage unless you pull out a credit card.
I refuse to do that. In Subra Space AI:
1 full personal health vault free for life. Point your phone at any digital medical monitor (OMRON, Accu-Chek, Braun & more). Zero cloud storage required.
1 offline workplace space free forever. Transcribe private voice notes and inspect documents 100% on-device.
1 private travel vault free forever. Scan flight passes, hotel vouchers, and passports without third-party tracking.
1 study and book research space free forever. Organize lecture audio and textbooks locally.
Technically, an individual can create their private space in each domain and use Subra Space AI for their entire lifetime without spending a single penny.
3. “If it's free, how does the app survive?”
This is the most critical question. Traditional SaaS companies burn millions on expensive cloud GPU clusters (like AWS or OpenAI APIs) every time you take a photo or ask a question.
Subra Space AI is architected differently:
- 100% Local Subra Space AI Brain: Our computer vision and AI models run locally on your iPhone or Android processor. Because there are no centralized cloud GPU costs, my server bill does not scale when millions of people scan their health monitors.
- Lean, Independent Operation: I don't have a boardroom of venture capitalists demanding 300% quarterly growth or user monetization. I build software for longevity, craft, and human utility.
4. Why upgrade to Subra Plus ($50 / year)?
In every category, one space is 100% free for life. That gives an individual everything they need to manage their own vitals and notes at zero cost.
However, to organize your life efficiently, you often need more than one space so distinct records don't get mixed together:
Separate private vaults for different family members (mother, father, children) so health records and prescriptions remain completely compartmentalized.
Distinct isolated workspaces for different clients, businesses, or confidential NDA projects.
Dedicated offline vaults for different trip plans (e.g., Summer in Europe vs. a short weekend getaway).
Separate study rooms for different courses, academic exams, or language learning goals.
Unlocks unlimited spaces in every category, multi-profile family vaults, clinical doctor export packs, and priority device vision updates.
A simple invitation from builder to user:
“If any space in Subra Space AI brought peace of mind to your life, saved you time, or helped care for a loved one — consider upgrading to Subra Plus ($50/year), even if you may not strictly need the extra spaces.”
Your patronage directly funds continued research into on-device neural vision models, brings support for more healthcare monitor screens, and ensures that the core spaces remain 100% free forever for anyone who cannot afford them.
My pledge to you
Your data never leaves your phone — unless you explicitly choose to export or share a report yourself.
Zero advertisements, zero third-party trackers, zero data brokering.
Free personal spaces will remain free forever.
With gratitude,
Subrata Kumar Das
Founder & Independent Engineer, Subra Space AI