briefkits

Terms of Service

Last updated: 7 August 2026

These Terms of Service (the “Terms”) are a binding agreement between Lengin OÜ, a company registered in Estonia (registry address: Kaupmehe tn 7-120, Kesklinna district, Tallinn city, Harju county, 10114, Estonia) — “Briefkits”, “we”, “us” — and the organisation or individual using the Briefkits application at app.briefkits.com and the briefkits.com website (together, the “Service”). “You” means that organisation, and every person you allow to use the Service under your account.

By creating an account, accepting an invitation to an existing account, or otherwise using the Service, you agree to these Terms. If you are agreeing on behalf of a company, you confirm that you are authorised to bind it.

Our Privacy Policy explains how we handle personal data and forms part of these Terms.

1. What the Service does

Briefkits is an advertising-analytics tool for businesses. You connect your own advertising accounts, and we retrieve your own ads, creatives, and aggregated performance metrics, analyse them — including with the help of AI providers — and present insights, creative reports, hypotheses, and creative briefs. The only advertising platform we currently support is Meta (Facebook and Instagram).

The Service is provided on a software-as-a-service basis. We may add, change, or discontinue features as the product evolves; we will not make a material reduction in core functionality of a paid plan without notifying account owners.

2. Eligibility and accounts

  • The Service is a business tool. It is not directed at consumers and not directed at anyone under 18. By using it, you confirm you are using it for purposes related to your trade, business, craft or profession.
  • You are responsible for the accuracy of your account information, for keeping credentials confidential, and for all activity that happens under your account.
  • Accounts are created by invitation or self sign-up. An account belongs to an organisation; the person who owns the organisation (“owner”) controls its workspaces, billing, connections, and membership.
  • Owners and admins can invite, remove, and assign members. If you invite someone, you confirm you are entitled to share with them the data available in that workspace.
  • You must notify us at info@lengin.com if you become aware of unauthorised use of your account.

3. Connecting your advertising accounts

  • You may connect advertising accounts you own or are authorised to access, and you authorise us to see the Facebook Pages you manage. You are responsible for having the necessary rights and permissions to connect them and to have us process the resulting data.
  • The permissions we request, and what each is for. When you connect Meta you are asked to grant exactly three permissions, and we use each only for the purpose stated here:
    • ads_read — read your ads and their aggregated performance metrics.
    • pages_show_list — see the list of Facebook Pages you manage. This is what allows us to obtain a Page token for the Page that published a given ad.
    • pages_read_engagement — read the content your own Pages published, so we can retrieve the video or image behind an ad and analyse the creative itself.

    We do not request permissions to manage or publish ads, post content, read messages, or access lead-form data. We show you the Pages covered by your authorisation when you connect, and we do not keep a separate register of your Pages.

  • Our integration with Meta is read-only. We retrieve ads, creatives, and aggregated performance metrics; we do not create, edit, pause, or otherwise manage your ads, we do not post or comment on your behalf, and we do not spend your advertising budget. The data we retrieve from a connected advertising platform — ads, creatives, aggregated performance metrics, and anything derived from them — is called “Platform Data” in these Terms.
  • We do not receive personal data about the people who saw or interacted with your ads. We retrieve aggregated, ad-level statistics and the creative assets you yourself published. We do not read comments, private messages, follower lists, or lead-form submissions, and we do not request audience demographics or any other per-person breakdown.
  • How we may use Platform Data. We use Platform Data only to provide and support the Service for the account that authorised the connection. We do not sell, license, or transfer it to data brokers, advertising networks, or anyone other than the processors listed in the Privacy Policy (section 4); we do not use it to build profiles of people or to target advertising; and we do not use it to train, fine-tune, or improve any machine-learning model (see sections 6 and 7).
  • How we protect it.Platform access tokens are encrypted by the application before they are stored, are never exposed to your browser, and are never shared with other customers. Each organisation’s data is isolated at the database level, creative files are held in private storage and served only through short-lived signed links, and our staff’s access is limited to what is necessary to operate and support the Service. The Privacy Policy (section 10) describes this in more detail.
  • Withdrawing access.Access is granted through the platform’s own authorisation flow and you can withdraw it at any time — in Briefkits (Settings → Workspaces → Disconnect) or in your Meta settings. Disconnecting in Briefkits deletes the stored access token and also revokes our authorisation on Meta’s side. Withdrawing access stops further data retrieval immediately and may make parts of the Service unusable; Platform Data we already imported remains until you delete it, as described in section 9.
  • You must comply with the terms of every platform you connect, including the Meta Platform Terms. Third-party platforms control their own APIs, rate limits, data availability, and authorisation rules. Interruptions, changes, or restrictions on their side may affect the Service, and are outside our control.

4. Plans, credits, and billing

Plans and trials. Paid plans, their prices, monthly credit allowances, and workspace limits are shown in the app before you subscribe. Every paid plan starts with a 14-day free trial. Your payment method is collected when the trial starts; unless you cancel before the trial ends, the subscription continues automatically and the first payment is taken when the trial ends. Without an active trial or paid plan you have no credits and cannot run analyses.

Credits. AI analysis consumes credits: one credit per ad analysed, regardless of the length of that ad’s video. Plan credits are granted for each billing period and do not carry over to the next period. Separately purchased top-up credits do not expire while your account is active. The app shows an estimate of the credit cost before you start an analysis, and an analysis will not start if your balance is insufficient.

Payment. Subscriptions and top-ups are processed by Stripe. You authorise us to charge your payment method for the recurring fees, top-ups, and applicable taxes until the subscription is cancelled. Fees are stated exclusive of VAT and other taxes unless indicated otherwise; where we are required to charge tax, it is added at checkout.

Renewals and changes. Subscriptions renew automatically for successive periods until cancelled. You can cancel at any time in the app; cancellation takes effect at the end of the current paid period, and you keep access until then. You can upgrade or downgrade a plan in the app; changes to allowances apply from the next billing period unless the app states otherwise.

Price changes. We may change prices for future billing periods. We will notify account owners by email at least 30 days before a price change takes effect; continuing to use the Service after that date means accepting the new price.

Refunds. Payments are non-refundable except where required by law, or where we decide otherwise at our discretion. Cancelling does not refund the current period, and unused credits are not refunded or exchanged for cash.

Non-payment. If a payment fails, we may suspend access to paid features until it is resolved.

5. Acceptable use

You agree not to:

  • use the Service unlawfully, or in breach of the terms of any connected advertising platform (including the Meta Platform Terms);
  • connect advertising accounts, Pages, or data you are not authorised to access;
  • upload or process content that infringes someone else’s rights or that you have no right to process;
  • attempt to access other customers’ data, probe or circumvent our security or access controls, or use the Service to build a competing product by scraping or bulk-extracting it;
  • resell, sublicense, or provide the Service to third parties outside your organisation, except as agency work carried out for your own clients whose accounts you are authorised to manage;
  • interfere with the Service’s operation, overload it, or bypass rate limits, quotas, or credit accounting.

We may suspend or terminate access that we reasonably believe breaches this section or exposes us, our providers, or other customers to legal risk.

6. Your data, our output, and intellectual property

Your data.As between you and us, you own the data you connect or enter — your ads, creatives, metrics, brand context, and notes (“Your Data”). You grant us a non-exclusive licence to host, process, transmit, and display Your Data solely to provide and support the Service, as described in the Privacy Policy. This licence does not include training. It does not permit us, or anyone acting for us, to use Your Data or Platform Data to train, fine-tune, or otherwise improve any machine-learning model.

AI output.Insights, reports, hypotheses, and creative briefs generated for you (“Output”) are yours to use for your business. Output is generated by automated systems from your own data and may be similar to output generated for other customers from similar inputs; we do not grant exclusivity over it.

Output is advisory. It may be incomplete or inaccurate, is not professional advice, and must not be treated as a guarantee of advertising performance. You are responsible for reviewing Output before acting on it, and for the ads you ultimately publish.

Our IP. The Service — including its software, interfaces, models, prompts, methodology, and branding — remains ours. These Terms grant you a limited, non-exclusive, non-transferable right to use the Service during your subscription, and nothing more.

Feedback. If you send us suggestions, we may use them without restriction or obligation to you.

Aggregated statistics. We may generate and use aggregated, de-identified statistics about how the Service itself is used — feature usage, request and analysis volumes, credit consumption, error rates, latency, and similar product telemetry — to operate, secure, and improve it, provided such statistics do not identify you, your organisation, or any individual.

This permission is limited to that telemetry. It does not extend to Platform Data.We do not pool Platform Data across customers, and we do not use it to build cross-customer benchmarks, industry averages, training sets, or any other product or dataset. Platform Data is used only to provide the Service to the account that authorised the connection. Where the Service shows you benchmarks, they are calculated from your own workspace’s data, or from static reference values that contain no customer data at all.

7. Third-party services

The Service depends on third parties, including Meta Platforms (advertising data), Supabase and Vercel (infrastructure), Google Cloud and Anthropic (AI processing), Stripe (payments), and Resend (email). We do not control their availability, terms, or policies, and we are not responsible for a third party’s own service to you or for an outage on their side. Your use of a connected platform remains governed by that platform’s own terms.

AI providers do not train on your data. Google Cloud (Vertex AI / Gemini) and Anthropic (Claude) process creatives, performance metrics, and brand context on our behalf, as our processors under written contract. They may use that content only to return a result to us, and are contractually prohibited from using it — including Platform Data — to train, fine-tune, or improve their models. We do not train models on Your Data or Platform Data either, and we grant no third party the right to do so. The Privacy Policy lists the providers we use; we log only request metadata (model, token counts, cost) for billing and monitoring.

We remain responsible for the providers we choose. Nothing above limits that responsibility: as between us and the advertising platforms we integrate with, we are accountable for our service providers’ handling of Platform Data, and we will only use providers bound to protections at least as strict as those in these Terms and the Privacy Policy.

Briefkits is an independent product and is not affiliated with, endorsed by, or sponsored by Meta Platforms, Inc.

8. Availability and support

We aim to keep the Service available and to fix faults promptly, but we do not commit to uninterrupted availability unless we have agreed a separate written service level with you. Maintenance, third-party outages, and factors beyond our reasonable control may cause interruptions.

Support is provided by email at info@lengin.com during business days.

9. Term, suspension, and termination

  • These Terms apply for as long as you have an account.
  • You may stop using the Service at any time, cancel your subscription in the app, or delete your account (Settings → Account → Delete account).
  • We may suspend or terminate access on notice if you materially breach these Terms, fail to pay, or if required by law or by a platform we depend on. Where practical and lawful, we will give you an opportunity to fix the problem first.
  • We may discontinue the Service as a whole with reasonable prior notice to account owners; in that case we will refund the unused portion of any prepaid subscription period.

On termination: access ends, and your data is deleted as described in the Privacy Policy (section 7). Deleting an organisation deletes its workspaces, stored platform tokens, imported Platform Data, and analyses.

How long deletion takes. Database records are deleted immediately, and stored creative files are removed by an automated cleanup shortly afterwards — in every case within 30 days. The only exceptions are records we are required by law to keep (principally billing records, retained for 7 years under Estonian accounting and tax rules) and backups, which are overwritten on our provider’s normal seven-day cycle.

Deleting only your advertising data. You do not have to delete your account to remove Platform Data. Detaching an ad account, or deleting the workspace that contains it, deletes the data imported from that account. Disconnect in Settings → Workspacesdeletes the stored access token and revokes our authorisation on Meta’s side. Deleting your account destroys the stored token, but does not by itself revoke the authorisation you granted on Meta — if you want that removed too, use Disconnect first, or remove Briefkits in your Facebook settings.

Export anything you want to keep before you delete an account or let a subscription lapse. We are not obliged to retain Your Data after termination, except where the law requires it.

10. Warranties and disclaimers

To the maximum extent permitted by law, the Service is provided “as is” and “as available”, without warranties of any kind, whether express or implied, including implied warranties of merchantability, fitness for a particular purpose, and non-infringement.

We do not warrant that the Service will be error-free, that Output will be accurate or complete, or that using the Service will improve advertising results.

11. Limitation of liability

To the maximum extent permitted by law:

  • Neither party is liable for indirect, incidental, special, or consequential loss, or for loss of profits, revenue, goodwill, advertising spend, or business opportunity, however caused.
  • Our total aggregate liability arising out of or in connection with these Terms and the Service, in any 12-month period, is limited to the greater of (a) the amount you paid or owed us for the Service in the 12 months before the event giving rise to the claim, or (b) EUR 1,000.

Nothing in these Terms limits liability that cannot be limited by law, including liability for intent or gross negligence, or for death or personal injury caused by negligence.

12. Indemnity

You will indemnify us against third-party claims, losses, and reasonable costs arising from your breach of these Terms, from Your Data, or from your lack of rights or permissions to connect the advertising accounts, Pages, or content you connect to the Service.

13. Data protection

Each party will comply with applicable data-protection law. Where we process personal data on your behalf as part of providing the Service, we do so in accordance with the Privacy Policy and, where required, a data processing agreement between us. Our sub-processors are listed in the Privacy Policy (section 4).

14. Confidentiality

Each party will keep the other’s non-public information confidential and use it only to perform under these Terms. This does not apply to information that is public through no fault of the receiving party, independently developed, or required to be disclosed by law.

15. Changes to these Terms

We may update these Terms as the Service evolves. We will post the revised version at this URL and update the “Last updated” date. If the changes are material, we will notify account owners by email at least 30 days before they take effect. Continuing to use the Service after that date means accepting the updated Terms; if you do not accept them, you may cancel and stop using the Service.

16. General

  • Governing law and jurisdiction. These Terms are governed by the laws of Estonia. Disputes are subject to the exclusive jurisdiction of the courts of Estonia (Harju County Court as court of first instance), without prejudice to any mandatory rights you have under the law of your country of establishment.
  • Assignment. You may not assign these Terms without our written consent. We may assign them to an affiliate or in connection with a merger, acquisition, or sale of assets, on notice to you.
  • Entire agreement. These Terms and the Privacy Policy are the entire agreement between us about the Service, and replace any earlier understandings.
  • Severability and waiver. If a provision is unenforceable, the rest remains in force. A failure to enforce a provision is not a waiver of it.
  • No partnership. Nothing here creates a partnership, agency, or employment relationship between us.
  • Force majeure. Neither party is liable for failure to perform due to events beyond its reasonable control.

17. Contact

Lengin OÜ
Kaupmehe tn 7-120, Kesklinna district, Tallinn city, Harju county, 10114, Estonia
Email: info@lengin.com