TatvaOS One · by Techvein
Your whole organisation, behind one sign-in.
Mail, files, calendar, meetings and identity for Indian schools, clinics and businesses. A person exists once. One account reaches every product — and when they leave, one action ends their access to all of it and forwards their mail to whoever takes over.
- Products live
- 6
- Data centre
- India
- Built in
- 7 weeks
The products
Six products, one account.
Every screen below is the real thing, photographed from a running build. Nothing here is a mock-up.
Business email on your own domain, with the things people actually miss when they leave Gmail — and the things Gmail never gave them.
- Conversations, categories with colours, filter rules applied at delivery
- Shared mailboxes: grants, send-as, and a switcher in the rail
- Search across every folder and every body, with operators
- Signatures, drafts, out-of-office replies
- Attachments scanned for viruses; oversize ones park in Space and send as a link
- IMAP and SMTP with app passwords, so Thunderbird and Outlook still work
Connect
Meetings that belong to the organisation, not to whoever started them. Scheduled from the console or from the phone.
- Live meetings first in the list, so you join the one that is happening
- Live captions, and recordings kept for 30 days
- Minutes by TatvaOS AI — summary, decisions, action items — for organisations that switch it on
- TatvaOS AI is optional and off by default. When your administrator turns it on, it processes content on a third-party service outside India
- Waiting room, host controls, mute all, meeting locks
- Guests join without an account, from a link or a code
- A meetings API, so an ERP or timetable system can create and list them
Calendar
Day, week, month and agenda. Recurrence and reminders. Invitations that arrive properly in Gmail and in Outlook — both directions.
- Invitations carried in the exact form each of Gmail and Outlook needs, and their replies read back
- A meeting link on the event, carried into the invitation
- Reminders that go out by mail
Space
Files for a person, for a team and for the whole organisation, out of the same allowance as their mail.
- My Space, Organisation, Shared with me, Trash
- Drag-and-drop upload with progress and cancel
- Public links with an audience you choose
- Save a mail attachment into Space without the bytes leaving the server
Core — the console
Where an administrator runs the organisation. People, domains, storage, keys and the record of who did what.
- Add one person, or upload a spreadsheet of hundreds
- Departments, roles, and one-action offboarding with mail forwarding
- Prove you own your domain — four methods, pick the one you can actually do
- Buy storage once, split it across Mail and Space yourself
- An audit trail of every administrative action, filterable by person and product
Your account
One place a person manages their own identity: photo, recovery details, two-step verification, signed-in devices and what their storage is being spent on.
- Two-step verification with an authenticator app and recovery codes
- Every signed-in device listed, and one click to sign out everywhere else
- An alert by mail when a new device signs in
- Storage broken down by product
- Family contacts, kept apart from the organisation directory
The platform underneath
The parts you only notice when they are missing.
A suite is only worth more than its parts if the parts share an identity, an allowance and a record. These are the pieces that make that true.
One identity, every product
A person exists once in Core. Mail, Calendar, Connect and Space read that one record. Remove them once and they are gone from all of it.
Isolated by the database
Organisations are separated by PostgreSQL row-level security, not by application code remembering to filter. It holds even when the code is wrong.
Sign in to your other software
TatvaOS is an OpenID Connect provider. Your library system, your ERP or your intranet can use a TatvaOS account to sign people in.
Two-step verification
Time-based codes from any authenticator app, recovery codes, a replay guard, and a challenge at sign-in that a stolen password cannot skip.
Storage bought once, split by you
Buy one number for the organisation. Your administrator divides it between Mail and Space and rebalances whenever they like — no new purchase, no ticket.
On the phone too
The TatvaOS One Android app is on Google Play. Mail and meetings on the phone, signed in with the same account — and it hands over to the browser for everything else.
Hosted in India
Your mail, files, calendar and recordings live on our server in Mumbai, with a full audit trail of every administrative action taken on your organisation.
Build on it
Three APIs, each behind an organisation key your administrator issues and can revoke. A key can never create an administrator.
- Mail API —
POST /v1/mail/send, restricted to sender addresses you name - People API — so your own software can admit and remove people
- Meetings API — a paged timetable an ERP can read and write
- SSO applications — register a client, choose the claims, see the consent screen your people will see
- A downloadable integration guide on the page itself
Plans
Plans for an organisation, and for one person.
Two front doors: an organisation brings its own domain and adds its people; a person signs up alone and gets an address at tatvaos.com. Ask us for pricing.
A small office or clinic getting off free Gmail.
- Up to 10 people
- 5 GB each
- 1 domain
A growing business or a school office.
- Up to 100 people
- 30 GB each
- 5 domains
- Mail and Space
A whole school or college, staff and students.
- Up to 500 people
- 2 TB pooled, split by you
- 10 domains
- Mail, Space and People
Many sites, many domains, its own rules.
- Unlimited people
- 10 TB pooled
- Unlimited domains
- Everything, including Payroll, Sheet and Word as they arrive
Trying it, and for people whose needs are genuinely small.
- 1 GB, shared across mail and files
- your.name@tatvaos.com
- Meetings up to 5 people, 60 minutes
- Live captions
- No recording, no TatvaOS AI minutes
A tutor, a freelancer, a shop — someone who works with others.
- 5 GB
- Meetings up to 20 people, no time limit
- Captions, and a plain meeting record built from who attended — no AI
- Mail signatures and the everyday features
- No recording, no TatvaOS AI minutes
Everything switched on, for people who record and review.
- 10 GB
- Meetings up to 50 people
- Recording, audio and video, kept 30 days
- Minutes by TatvaOS AI — summary, decisions, action items, in English whatever language the meeting was in
| Add-on | Note |
|---|---|
| +10 GB storage | Stackable |
| +50 GB storage | Stackable |
| Big meetings, up to 100 | Premium only |
How it was built
Seven weeks, from an empty repository to production.
The first commit is dated 4 August 2026. Everything on this page was built between then and now — the numbers are the repository's own, not written afterwards.
- First commit
- 4 Aug 2026
- Commits, as of 23 Sept
- 1,070
- Elapsed
- 7 weeks
Start on your own timetable. Your mail keeps working.
Signing up does not touch your existing email. You prove you own your domain and create your people; mail only starts arriving here when you change your domain's records, and that is your step to take. Bringing old mail across is a guided copy from your current mailbox — we have the step-by-step, and we will help.