Terms of Service

Last updated 30 September 2026

The rules for using Tachyn, written to be read. The key terms come first; the numbered terms are the ones that apply.

Key terms

• Recognition and clean-up are automated and can be wrong. Check text before you rely on it or send it; you are responsible for how you use it.
• We may change features, providers, usage limits and prices. If a change materially reduces a paid plan, you can cancel and get a pro-rata refund for the unused time.
• Payments are not refundable except as these terms or the law provide. Consumers keep the 14-day cancellation right, less a proportionate amount for service already provided.
• We may suspend or end an account at once for a breach, non-payment, or a security or legal risk.
• For business customers: the service is provided as is; our liability is capped at the fees paid in the 12 months before a claim; you indemnify us; claims must be brought within one year; no group actions; the courts of England and Wales have exclusive jurisdiction.
• Nothing in these terms affects your statutory rights as a consumer.

1. About these terms

These terms are a contract between you and Sylphx Limited, registered in England and Wales, company no. 16438428 (registered office: 128 City Road, London EC1V 2NX; phone +44 7537 188 188) ("we", "us"), for the Tachyn app, website and service. Contact us at hi@tachyn.ai.

You are a consumer if you use Tachyn wholly or mainly outside your trade, business or profession. If you use it for a business, you confirm you may accept these terms for that business, which is then bound by them, and the terms marked for business customers apply.

2. Your account

You need an account to use cloud recognition. Keep your sign-in secure; you are responsible for everything done with your account. You must be at least 13, and old enough to make a contract where you live to buy a plan.

3. Plans

• Free: 2000 words a week, reset every Monday at 00:00 UTC.
• Lite: no word limit, with 15 hours of cloud recognition a calendar month on the Standard model. Past it, cloud recognition pauses and your dictations are kept in History with their audio, at no extra charge, and cloud recognition resumes at the start of the next month.
• Pro: no word limit. Each calendar month includes 10 hours of cloud recognition on the Premium model, then the Standard model, subject to fair use of 60 hours of cloud recognition. Past it, cloud recognition pauses and your dictations are kept in History with their audio, at no extra charge, and cloud recognition resumes at the start of the next month.
• Max: as Pro, with 40 hours on the Premium model and fair use of 150 hours of cloud recognition a calendar month.
• Team: Pro for each seat, billed to one account.
• Trial: new accounts get Pro free for 14 days, with no card needed. When the trial ends, the account moves to Free unless you subscribe.

We may set and change usage limits, fair-use thresholds and the models and providers behind the service, and we may refuse or limit service where we reasonably suspect abuse.

4. Prices, payment and renewal

Prices are shown on the pricing page in US dollars and include VAT or sales tax where it applies. Payments are taken by Stripe. A subscription renews automatically at the end of each month or year and is charged to your payment method until you cancel. We send any renewal reminders the law requires.

We may change prices. We tell you a reasonable time before a new price applies to your next renewal, and you can cancel before then. If a payment fails, Stripe retries it; if it still fails, we may move your account to Free.

5. Cancelling and refunds

You can cancel at any time from the account page (Manage subscription) or the app. Cancelling stops the next renewal; you keep your plan until the end of the period you paid for.

Your 14-day right to cancel: if you are a consumer in the UK or the EU, you can cancel within 14 days of your first payment, or of an upgrade, without giving a reason. Cancel from the account page or email hi@tachyn.ai with a clear statement that you are cancelling. We refund that payment to the original payment method within 14 days. Where you asked us to start the paid service straight away, we deduct a proportionate amount for the service provided until you told us you were cancelling.

Otherwise, payments are not refundable, except where these terms say so or the law requires it. If you are a consumer, your statutory rights when the service is not supplied with reasonable care and skill are not affected.

6. Using Tachyn well

• Do not use Tachyn to break the law, to record people without the consent the law requires, or to infringe anyone's rights.
• Do not try to get around plan limits, share an account, resell the service, probe or reverse engineer it except where the law allows, or interfere with or overload it.

7. Your content

What you dictate and the text Tachyn produces are yours. You give us a worldwide, royalty-free, non-exclusive licence to process them only as needed to provide and secure the service, as the privacy policy describes; we do not use them to train AI models. You are responsible for your content and for checking text before you rely on it or send it. If you send us feedback, we may use it freely, without any obligation to you.

8. The service

Tachyn depends on networks and providers outside our control, and is provided as it is and as available, without any promise that it will be uninterrupted, error-free or suited to a particular purpose, except as the law requires. We may change, add or remove features, models and providers. If a change materially reduces a paid plan, we tell you, and you can cancel and get a pro-rata refund for the unused time.

9. Liability

Nothing in these terms limits liability for death or personal injury caused by negligence, for fraud or fraudulent misrepresentation, or for anything else the law does not allow us to limit.

If you are a consumer: we are responsible for loss you suffer that is a foreseeable result of our breaking these terms or failing to use reasonable care and skill. We are not responsible for loss that was not foreseeable, for business losses, for events outside our reasonable control, or for what you do with recognised text, unless the loss comes from our breaking these terms or failing to use reasonable care and skill. If the Tachyn app damages your device or other digital content because we did not use reasonable care and skill, we will repair the damage or compensate you.

If you are a business customer, each of the following applies to the extent the law allows: all terms implied by law are excluded; we are not liable for indirect or consequential loss, loss of profits, revenue, business, goodwill or data, or loss arising from recognised or cleaned-up text or from third-party services; our total liability in connection with these terms is limited to the fees you paid us in the 12 months before the event giving rise to the claim; you indemnify us against claims, losses and costs arising from your content, your use of Tachyn, or your breach of these terms or the law; any claim must be brought within one year of the event giving rise to it; and claims may be brought only individually, not as part of a group or representative action.

10. Suspending and ending

You can stop using Tachyn and delete your account at any time. We may suspend or end your account at once if you break these terms, do not pay, or put the service, other users or us at risk, or where the law requires it; and for any other reason on reasonable notice. If we end it for a reason other than your breach, we refund any unused prepaid time.

11. Changes to these terms

We may update these terms, for example for changes in the law, in the service or in how we provide it. If you are a consumer and a change matters, we tell you in the app or by email a reasonable time before it applies, and you can cancel before then. For business customers, a change applies from the date we give.

12. General

We may assign these terms or subcontract our obligations; if you are a consumer, we tell you and your rights are not reduced. You may not assign them without our consent. If a court finds part of these terms unenforceable, the rest stays in force. A delay in enforcing a right does not waive it. No one else has rights under these terms. For business customers, these terms are the entire agreement, and you do not rely on any statement not set out in them; this does not limit liability for fraud.

13. Law and courts

These terms are governed by the law of England and Wales. If you are a consumer, you can bring proceedings in England and Wales or where you live, and you keep the protection of the mandatory laws of the country where you live. Business customers submit to the exclusive jurisdiction of the courts of England and Wales.