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Voyelle · Published by OpaleCrest

Terms of sale

Last updated: 26 October 2026

This English version is provided for your convenience. The French version is the one that binds.

These terms govern the Voyelle Plus subscription and the purchase of a year of Voyelle Plus as a gift, offered by Mathieu Corne, a sole trader operating under the trade name OpaleCrest (SIREN 943 061 820), 50 avenue des Champs-Élysées, 75008 Paris, France, who can be reached at contact@opalecrest.com or on +33 9 72 16 60 88. VAT not applicable, article 293 B of the French General Tax Code. Use of the service is governed by our terms of use.

The free plan and Voyelle Plus

Voyelle can be used for free, with no time limit. The free plan gives access to the whole library, with no limit on decks or reviews: the daily session, which Voyelle prepares from all your decks, is unlimited, and each day you can run 1 targeted session on the deck or topic of your choice. It also includes 1 streak freeze a year, live sessions with up to 5 participants, Apéro games with up to 5 players and the titles of your last 3 evenings. It involves no sale.

The Voyelle Plus subscription puts you in charge of your sessions: unlimited targeted sessions, reviewing cards before they are due, intensive revision of a deck or topic before an exam and choosing the order of new cards, without upsetting your review schedule. It also gives 1 streak freeze a month, live sessions with up to 50 participants, your full history of titles with one of them shown next to your nickname, and the statistics and past days of the daily challenge. At an Apéro, each subscriber present adds seats: a game grows from 5 to 10, 16 then 24 players with the number of subscribers present. Voyelle Plus gives no advantage in play.

Teachers, student societies and administrators of partner institutions whose role has been granted use Voyelle with no limits and for free, without any contract of sale.

Price

Voyelle Plus costs €9.99 a month or €59.90 a year, all taxes included. The price is the same on the web and in the Android app. A year of Voyelle Plus as a gift costs €59.90, all taxes included, paid once.

We may change this price. A new price never applies to the current period: it is announced to you before the renewal it concerns, and you remain free to cancel before then.

Subscribing

On the web, you subscribe from the Voyelle app, after accepting these terms. Payment is handled by Stripe; we never receive or store your card number.

Before paying, you tick the box by which you ask for Voyelle Plus to start immediately, without waiting for the end of the withdrawal period, and acknowledge that if you withdraw you will pay for the period already elapsed. That request is recorded with its date, its time and the version of these terms, and attached to your subscription.

In the Android app, you subscribe through Google Play. Payment, billing and management of the subscription then go through Google Play, under its own terms, which apply in addition to these.

Either way, the subscription is tied to your Voyelle account and works on all your devices. An email or a receipt from Stripe or Google Play confirms the subscription.

Payment and renewal

The first period, one month or one year as you choose, is paid when you subscribe. The subscription then renews automatically for a period of the same length, paid at the start of each, until you cancel it. There is no commitment beyond the current period.

Giving Voyelle Plus

On the web only, you can buy a year of Voyelle Plus for someone else. It is a one-off purchase: it never renews and leads to no other payment. Payment is handled by Stripe and a receipt is sent to you. Before paying, you tick the same immediate access box as for a subscription, recorded the same way.

Once the payment is received, you get a code and a link to pass on. The recipient uses it on their own Voyelle account and gets 12 months of Voyelle Plus, starting then, or when the Voyelle Plus they already have ends. While one of the recipient's subscriptions still renews, the code cannot be used: it stays valid, and the recipient can use it after cancelling. A code works once and stays valid until it is used. At the end of the 12 months, the recipient's account returns to the free plan, with no charge.

Right of withdrawal

Under articles L. 221-18 et seq. of the French Consumer Code, you have fourteen (14) days from your subscription to withdraw, without giving a reason and at no cost. Voyelle Plus is a digital service provided continuously: this right cannot be excluded.

To exercise it, you can:

  • use the online withdrawal form, which works without signing in;
  • write to us at contact@opalecrest.com, stating the email address or account concerned;
  • for a subscription taken out in the Android app, also ask Google Play for a refund.

The subscription then ends immediately and you are refunded within fourteen (14) days of your request, using the payment method you subscribed with. If, when subscribing, you expressly asked for Voyelle Plus to start before the end of that period, the share of the price matching the time elapsed until your withdrawal remains due, calculated pro rata to the period subscribed, each day begun counting as a day (article L. 221-25 of the French Consumer Code), and the balance is refunded. Without that express request, notably for a subscription taken out in the Android app, the refund is in full.

For a year of Voyelle Plus given as a gift, this right belongs to the buyer, for fourteen (14) days from payment, by the same means, using the email address used to pay. The code is then cancelled and, if it has already been used, the recipient's Voyelle Plus ends. The refund is in full while the code is unused. If it was used and immediate access had been asked for, the days begun since it was used remain due, pro rata to the year, and the balance is refunded.

After those fourteen days, ending the subscription is a cancellation, as described below. A gifted year never renews, so there is nothing to cancel.

Cancellation

Under article L. 215-1-1 of the French Consumer Code, you can cancel at any time, free of charge, in a few clicks, as easily as you subscribed:

  • for a subscription taken out on the web, from the app's settings (“Manage my subscription”);
  • for a subscription taken out in the Android app, from Google Play (Payments & subscriptions, Subscriptions);
  • or by writing to us at contact@opalecrest.com.

Cancellation takes effect at the end of the current period, which is not refunded; no further payment is taken. Your account then returns to the free plan, and your cards, decks and progress are kept.

Changes to the service

The service evolves: we may add, change or remove features, without reducing what Voyelle Plus gives you during the current period.

Liability

Voyelle is provided as is. We use reasonable means to keep it working, available and secure, without guaranteeing that it is error-free or always reachable. Voyelle does not guarantee success at an exam.

We cannot be held liable for damage resulting from force majeure within the meaning of article 1218 of the French Civil Code, nor from use of the service that does not comply with these terms or the terms of use.

Voyelle is a digital service within the meaning of articles L. 224-25-1 et seq. of the French Consumer Code. It must match the description we give of it and the uses you can legitimately expect. If it does not conform, you can require it to be brought into conformity at no cost and, failing that, obtain a price reduction or the termination of the contract, under the conditions set by law.

Personal data

How we process your data is described in our privacy policy.

Change of publisher

Voyelle is currently published by Mathieu Corne, a sole trader. This contract may be transferred to any company that succeeds him in operating the service, in particular following a change of legal form. Such a transfer does not affect your rights, and you will be told before it takes effect.

Governing law and disputes

These terms are governed by French law. In the event of a dispute, you may bring the matter before any court with territorial jurisdiction of your choice, in particular the court of your place of residence.

Under article L. 612-1 of the French Consumer Code, after contacting us and if our answer does not satisfy you, you can turn to a consumer mediation service free of charge:

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