//support — a person answers
Support
If something is wrong, write to us and a person will read it. But most of what looks broken in Tacendum is the product keeping a promise — this page says how to reach us, what we can actually do, and where the honest answer is “that is the design”.
Last updated 2 September 2026·Covers the Tacendum iPhone app and tacendum.com·tc-support@tacendum.com
Talk to a person
Write to tc-support@tacendum.com. A person reads it — not a bot, not a ticket queue, not a phone tree. You will hear back within two business days.
What helps: your iOS version, the app version — Settings shows it at the bottom — and what happened, in the order it happened. Never send message content, or screenshots of a conversation. Your conversations are yours; we do not need them to help you, and an email is a record in our mailbox — we would rather not hold in a mailbox what the product was built never to hold on a server.
One limit on us, not on you: we cannot verify who holds an account. An account has no name; an email or username someone chose to link is held only as a scrambling that proves possession to the app, not identity to us; and its id proves nothing — it is printed on a code you have shown people. So we will not discuss, hand over, or delete an account because somebody quotes its id, an email or a username at us. The one exception, a parent’s request about a child, is in the Terms; the same page sets out what that means for requests about your data.
What is not a bug
Most of the mail a product like this gets is about the things it refuses to do. Each one below is a deliberate absence, and support cannot switch any of them on — for you, for a reviewer, or for us.
A lost iPhone is a lost account
Your account is a cryptographic key that lives on your phone and nowhere else — if the phone is lost, wiped, or the app deleted, the account is gone, with no reset and no recovery route for anyone, because an account we could restore on request is an account someone else could talk us into. Starting again mints a new 26-character id you hand out yourself; the Terms walk through every consequence.
Message history does not sync, restore, or transfer
Your conversations exist only on your phone and the phones of the people in them — we keep no archive, and the app keeps the message database and keys out of iPhone backups, so a new phone starts empty. The Privacy Policy says exactly what stays on the phone and what a backup can still carry.
Nobody can be found unless they chose to be
There is no directory and no search for people. A conversation starts when someone hands you their 26-character id, normally by showing you a code you scan in person — or, if they linked an email address or username and switched findability on, when you type that exact identifier into Find. If you cannot find someone, either they did not choose to be found or they are not here, and the app will not tell you which; that is the absence working — and nobody can find you either, unless you choose it, per identifier.
A quiet notification is usually a setting, not a failure
- Previews default to showing the sender’s name only; the choices are name and text, name only, or just “New message”.
- Previews run on a seven-day lease renewed when you unlock the app — go a week without unlocking, or lock the app, and notifications show nothing until you unlock again.
- With Settings → Notifications → “Let Apple wake this iPhone” switched off, messages arrive with no notification and calls ring only while the app is open.
The Privacy Policy has the mechanics, including what Apple receives.
Group calls have no video
A room can hold a voice call of up to six people; video calls are one to one. There is no group video call in this version, and no setting reveals one — the button you are looking for does not exist.
There is no iPad app
Tacendum is an iPhone app. It is not hidden on the iPad’s App Store; it does not exist there today.
The screenshot notice has no off switch
Take a screenshot inside a conversation and the other person is told — everyone in it, if it is a room — and no setting turns that off, because a disclosure that can be switched off is not a disclosure. The Terms cover the details, including the narrow cases where no notice is sent.
We cannot reset the app-lock passcode
The app-lock passcode is stored only on your phone and never sent to us, so there is nothing on our side to reset it with. Wrong guesses cost waiting — five attempts, then a cooldown that doubles to fifteen minutes — and never erase anything.
Reporting a person
If someone is using Tacendum to harm you, there are two routes, and the faster one is in the app: open the person’s profile and choose Report. The report screen shows exactly what will leave your phone — that account’s id, a category, and only the messages you explicitly select — and nothing you did not select is sent. You can also write to tc-support@tacendum.com and say what happened.
What happens next. A person reads every report, within two business days, and we keep a report for 180 days (the Privacy Policy lists it in the retention table). Your messages are encrypted and we cannot read them, so we act on what you chose to send and on what is visible from the outside; the furthest our power goes is ending the reported account’s access. The Terms are honest about how narrow that is.
What protects you immediately is on your phone. Block the person. From that moment your device shows you nothing from them and sends them nothing — they cannot ring you, and they cannot tell they were blocked. It works the instant you use it and needs nothing from us. Separately, “silence unknown callers” is on by default, so someone you have never exchanged a message with cannot make your phone ring — they leave a missed-call row you answer at your own pace.
If you are in danger, your local authorities can do things we cannot, and the evidence on your own device is worth more than a report to us. Tacendum is not an emergency service.
Reporting a security problem
A vulnerability rather than a person: write to security@tacendum.com, or to tc-support@tacendum.com — a person reads either, and a good-faith report must not depend on picking the right address. The reporting terms — what to include, the window we ask for, and the commitment not to pursue good-faith research — are on the How it works page, and they are short.
Deleting your account
In the app: Profile → Delete account. It is the only exit — there is no sign-out, because your conversations exist only on your phone and “sign out and come back later” is a promise the design cannot keep.
Deletion needs a working connection and acts on our servers first — your id stops working before anything on the phone is touched. Only then does the app wipe your history, keys, and lock settings. Offline, it fails and destroys nothing. It is irreversible.
What deletion does not erase: messages already delivered to other people’s phones, ciphertext still queued for somebody else (up to thirty days), log lines carrying your account id (up to ninety days), and database backups (up to thirty-five days) — the complete list, with the reason for each item, is in the Privacy Policy.
Deleting the account needs the key, so a lost key means the account cannot be deleted — the Terms say why, and what a stranded account amounts to.
Everything else
- What our servers hold, and what they cannot read — the Privacy Policy. It is written as an inventory, and it is the fuller answer to almost any “what do you know about me” question.
- The agreement, including what we can and cannot do about abuse — the Terms of Service.
- How the encryption actually works, limits included — How it works.
- The command-line client and the MCP server — Developers.
- The source code — AGPL-3.0-only, and not published yet. It goes up at launch at github.com/MiranaTechs/Tacendum, which is reserved and empty today. Until then, email hello@tacendum.com naming the version you have and we send you its source; the Terms set out the arrangement.
Tacendum is operated by Mirana Technologies Inc. Contact is by email; we do not publish a postal address, because there is no office and the alternative would be somebody’s home.