Tulbrain support
Tulbrain support: how to reach the team behind the app.
Last updated: October 8, 2026
This page is for anyone using the Tulbrain app (package com.netmindcloud.tulbrain),
published by NETMIND CLOUD LLC, 1621 Central Ave, Cheyenne, Wyoming 82001, USA. You do not
need an account to write to us.
Get in touch
Write to hello@netmindcloud.com. Tell us which device you are using and what you were doing when the problem appeared: a screenshot helps more than anything else. We read every message and we answer in writing.
Emails from us
We only ever write to you from hello@tulbrain.com or hello@netmindcloud.com. Check the address itself, not the sender name: anyone can put “Tulbrain” on an email sent from any account.
We will never ask you to reply to an email with a password or a verification code. And we will never ask you for card or payment details at all: if you subscribe, you pay in the store where you got the app (the App Store or Google Play), never through us.
Every link we send goes to tulbrain.com, tulbrain.us or netmindcloud.com. If a message takes you somewhere else, it is not from us, however much it looks like us.
If you are not sure about a message, do not reply to it and do not open its links. Forward it to hello@netmindcloud.com and we will tell you whether it was ours.
Delete your account
You can ask us to delete your account at any time, and you do not need the app installed to do it. The full procedure, what is deleted and how long it takes are on our account deletion page.
Your subscription
You can cancel a subscription at any time, in the store where you bought it:
- Google Play: see Google Play Help. In the app, Settings → My subscription → Manage subscription takes you there.
- App Store: see Apple Support. On iPhone, Settings → My subscription → Manage subscription opens Apple’s subscriptions screen in the app.
Cancelling stops the next renewal, and you keep access until the end of the period you have already paid for. Uninstalling the app does not cancel your subscription.
If you delete your Tulbrain account: a Google Play subscription is cancelled along with it. Deleting your account ends your access straight away, and it does not by itself refund the time left in the period you paid for. An Apple subscription is not cancelled when you delete your account — Apple does not let us cancel it for you — so cancel it first in your Apple Account settings, under Subscriptions. If you don’t, it keeps renewing and charging you even after your account is gone.
Energy and Energy packs
- How it works. Activities use Energy; opening a lesson doesn’t. In the app you see two counters: the yellow ⚡ is the free Energy, which tops up every day (if you don’t use it, it doesn’t add up or carry over); the green ⚡ is your green Energy: the Energy loaded in your account. Free Energy is used first, then green Energy.
- Energy packs. In the app you can buy packs of 10, 30, 50 or 100 Energy. Each pack is a one-time purchase, not a subscription. Green Energy doesn’t expire while you have your account, and there’s no limit to how much you can keep.
- A pack didn’t arrive. Some payment methods take a while to confirm; your Energy is added when the payment is confirmed. If you were charged and it still doesn’t appear, write to hello@netmindcloud.com with your order number from the App Store or Google Play.
- Refunds. You ask for a refund in the store where you made the purchase: on iPhone, from Apple at reportaproblem.apple.com; on Android, from Google Play or by writing to us. If it’s approved, we remove from your balance only the purchased Energy you haven’t used, and your balance never goes below zero. If the law of your country gives you a right of withdrawal, see our Withdrawal button.
- If you subscribe. A subscription has no Energy limit. Your green Energy stays saved for when your subscription ends.
- Changes. If a change is worse for you (for example, an activity starts using more Energy), we tell you in the app at least 30 days before. If an activity starts using more Energy and you don’t agree, you can ask us for a refund of the purchased Energy you haven’t used.
- If you delete your account, you lose your green Energy (account deletion page).
- United Kingdom: there is no Energy; Tulbrain is by subscription only.
The full rules are in section 16 of our Terms.
Your data and your privacy
What we collect and why is in our Privacy Policy. If you want a copy of your data, a correction, or its deletion, write to the address above: we act without undue delay and in any event within one month.
Which language to write in
Write to us in English, Spanish or German. If you write in another language we will still answer; it may take us a little longer.