Letros

Terms of Service

These terms govern your use of Letros (letros.app), an online service for language schools and teachers, provided by TOTORO TEACHER DOO BAR ("we"). By creating an account or using the service you agree to them.

1. The service

Letros lets schools and teachers run classes, courses, live lessons and homework, and check written work with a writing checker. Some features use artificial intelligence (the writing checker, "Make with AI", import from a photo, translations, pictures and audio). Their results are suggestions: check them before you use them, and they are not an official exam result.

2. Accounts

  • You sign in with a one-time code sent to your email, or with a username and password created by your school.
  • You are responsible for activity in your account and must keep your email and password secure.
  • A school administrator or teacher who creates accounts for students confirms that they are allowed to do so, including the consent of parents or guardians where the law requires it.

3. Plans and payment

  • Free plan: costs nothing, with no time limit: up to 4 active students and 20 writing checks a day per user.
  • Free trial: every new workspace (a private teacher's or a school's) is free without a card until 31 December 2026, or for one month (30 days) from its creation if that ends later: up to 300 students on a trial that ends on 31 December 2026, otherwise up to 100, and unlimited teachers. When the trial ends, the workspace moves to the Free plan by itself and nothing is charged. Students above the Free limit keep their access, but no more can be added or activated until you are under the limit or choose a paid plan.
  • Paid plans: the Teacher plan (one teacher) and the School plans (unlimited teachers), each for a number of students, at the prices on the pricing page. They are billed monthly or yearly in advance and renew automatically until cancelled.
  • Our order process is conducted by our online reseller Paddle.com. Paddle.com is the Merchant of Record for all our orders. Paddle provides all customer service inquiries and handles returns.
  • You can cancel at any time on the Plan page in the app or by writing to us. The plan stays active until the end of the paid period, then the workspace moves to the Free plan. Refunds follow our refund policy.
  • We may change prices with at least 30 days' notice by email; the new price applies from the next billing period.

4. Your content

Lessons, homework, essays, photos and other material you upload remain yours. You give us permission to store and process them only to provide the service to you. You must have the right to upload them. Personal data of other people that you put into Letros, such as your students' data, we process on your behalf under our Data Processing Agreement; the providers we use are on the sub-processors page.

5. Acceptable use

  • Do not upload unlawful content or content that infringes the rights of others.
  • Do not try to break, overload or gain unauthorised access to the service or other accounts.
  • Do not resell the service or use automated means to get around plan limits.

We may suspend accounts that break these rules.

6. Availability and changes

We work to keep Letros available and your data safe, but the service is provided "as is" without guaranteed uptime. We may improve or change features; if we remove a paid feature, we will refund the unused part of your subscription.

7. Liability

To the extent the law allows, we are not liable for indirect or consequential losses, and our total liability is limited to the amount you paid us in the 12 months before the claim. Nothing in these terms limits rights you have as a consumer under the law.

8. Ending the service

You can stop using Letros and ask us to delete your account at any time by writing to hello@letros.app. We may end the service with 30 days' notice and a refund of any unused prepaid period.

9. Changes to these terms

We may update these terms. We will tell you about important changes by email or in the app before they take effect.

Last updated: 22 October 2026. Contact: hello@letros.app. Letros is operated by TOTORO TEACHER DOO BAR, Topolica III, Bar, Montenegro.

Data location: Germany (EU). Schools: Data Processing Agreement · Sub-processors.