Terms of Service

1. About these Terms

These Terms of Service (“Terms”) are a binding agreement between you (“you,” “User”) and HeyDaily Inc. (“HeyDaily,” “we,” “us,” “our”). They govern your access to and use of Sauna™, our AI assistant product, available at app.sauna.ai and through related surfaces (collectively, the “Service”).

By creating an account, accessing, or using the Service, you agree to these Terms and to our Privacy Policy. If you do not agree, do not use the Service.

If you are using the Service on behalf of an organization, you represent that you have authority to bind that organization, and “you” includes that organization.

“Sauna” is a trademark of HeyDaily Inc. (USPTO Serial No. 99285540, Class 42; Notice of Allowance issued April 3, 2026). All other marks are property of their respective owners.

2. The Service

Sauna™ is an AI assistant operated by HeyDaily. With your authorization, Sauna connects to your email, calendar, messaging, and other accounts via OAuth or API key; processes your prompts and content using third-party AI models; generates artifacts (documents, code, images, audio, presentations, web pages); executes actions in connected services subject to your approval or under agentic, scheduled, or autonomous features you have enabled; runs code in a cloud sandbox; operates a browser on your behalf; and persists memory across sessions to improve future interactions. The Service is available through the web app at app.sauna.ai, mobile web, iMessage / SMS, Slack, email forwarding to hey@sauna.ai, and other surfaces we may add or remove.

3. Eligibility and Right to Refuse Service

To use the Service, you must be at least 18 years old (or the age of majority in your jurisdiction, if higher), and must not be a person prohibited from receiving services under U.S. or other applicable law (including OFAC-sanctioned jurisdictions and individuals on U.S. denied-party lists).

We may, in our sole discretion and without obligation to give a reason:

refuse to create an account for any person or entity;
refuse to provide, suspend, restrict, or terminate the Service or any feature of it for any user, at any time, with or without notice;
limit access by jurisdiction, IP range, device, payment method, or any other factor we determine relevant.

Bases on which we may refuse or terminate include, without limitation: prior or suspected violation of these Terms, suspected fraud, suspected abuse of the Service or our infrastructure, residence in a sanctioned jurisdiction, association with a previously banned account, posing a risk to other users or to our business, or any other reason.

4. Account Registration and Security

To use most of the Service, you must register an account. You agree to:

provide accurate, current, and complete information;
keep your account information up to date;
maintain the confidentiality of your credentials;
be responsible for all activity under your account;
notify us promptly at security@sauna.ai of any unauthorized access.

You may not share, sell, or transfer your account. We may require email or phone verification before activating an account or specific features.

5. Plans, Credits, Fees, and Refunds

5.1 Plans

The Service is offered on a free plan and on paid subscription plans. Current plans, prices, and inclusions are described at app.sauna.ai/settings/billing. As of the Last Updated date, the plans are:

Free — $0/month. 100 credits per day. 200 credits per day if you have a verified payment card on file (verification is a no-charge Stripe setup-intent flow). No monthly allowance.
Basic — $99 USD/month. 200 credits per day; 6,000 credits per month.
Pro — $299 USD/month. 200 credits per day; 18,000 credits per month.
Team — $999 USD/month. 200 credits per day; 60,000 credits per month.

We may change plans, prices, allowances, or plan features prospectively. Changes apply to your next renewal after notice through the Service or by email.

5.2 Credits and allowances

Use of the Service is measured in credits. Different operations consume different amounts of credits depending on the work involved. We do not publish a per-operation rate sheet.

Daily allowance resets every day at 00:00 UTC.
Monthly allowance resets on your subscription anniversary date (the day of the month you subscribed), not the calendar month.
Balance is a separate, non-resetting pool of credits in your account, accumulated from topup-pack purchases, invite acceptances, and any one-time grants we choose to make. Balance does not expire while your account is active.
When you do billable work, allowances and balance are drawn down together. When daily, monthly, and balance are all exhausted, the Service is paused for you until the next daily reset, until you add credits via topup, or until you upgrade to a higher plan.

Unused daily and monthly allowances do not roll over and have no cash value. Allowances are personal to your account and are not transferable.

5.3 Topup packs

You may purchase one-time topup packs that add credits to your balance, currently:

200 credits for $10
500 credits for $25
1,000 credits for $50
2,000 credits for $100

Topup-pack credits land in balance shortly after purchase. Topup packs are one-time purchases and do not change your subscription. Topup credits have no cash value and are non-refundable except where required by law (see Section 5.7).

5.4 Invites

When you send an invite and the recipient creates an account and accepts, both you and the recipient receive 1,000 credits in your respective balances. Invite credits have no cash value, are non-transferable, and are non-refundable. We may modify, suspend, or end the invite program at any time, and we may invalidate invite credits earned through fraud, abuse, automated activity, self-referral, or violation of these Terms.

5.5 Billing, payment, and auto-renewal

By providing a payment method, you authorize us (and our payment processor, Stripe) to charge that method for all fees due, including subscription fees, topup-pack purchases, and any taxes. Subscriptions automatically renew at the end of each billing cycle at the then-current rate, until cancelled.

Cancellation. You may cancel at any time from /settings/billing in the web app, which opens the Stripe customer portal, or by emailing support@sauna.ai. Unless we say otherwise, cancellation takes effect at the end of your current billing cycle; you keep your paid plan’s allowance through the rest of that cycle and then drop to the Free plan. We do not pro-rate or refund the unused portion of a cycle on cancellation.

Plan changes. Upgrades and switches go through Stripe Checkout from the plans grid and take effect immediately on completion. We may pro-rate charges for mid-cycle upgrades through Stripe; downgrades take effect at the end of the current cycle.

California residents. This constitutes the disclosure required by California’s Automatic Renewal Law: your subscription will automatically renew, you will be charged at the renewal rate, and you may cancel at any time from /settings/billing or by contacting support@sauna.ai. We will send renewal and price-change reminders where required by law.

5.6 EU/EEA digital services waiver

If you are an EU/EEA consumer, you may have a 14-day right of withdrawal for digital services. By starting to use the Service before that period ends, and by checking the relevant box at signup, you expressly request immediate performance and acknowledge that you lose your right of withdrawal once performance has begun.

5.7 No refunds

Except where required by applicable law (including the EU/EEA right of withdrawal under Directive 2011/83/EU, where you have not waived it), all fees are non-refundable, including subscription fees, topup-pack purchases, and any unused credits or allowances, and including in the event of suspension, termination, downgrade, account closure, plan change, or non-use. We may, in our sole discretion, offer pro-rata or full refunds in exceptional cases through support@sauna.ai, but we are under no obligation to do so. Termination of your account, including for violation of these Terms, does not entitle you to a refund of any fees paid or any unused credits.

5.8 Promotional pricing and credit grants

Promo codes, discounts, and one-time credit grants apply only as described at the time of issue. We may modify, revoke, or recover promotional pricing or credits in cases of fraud, abuse, automated activity, or violation of these Terms.

5.9 Taxes

Fees are exclusive of taxes. You are responsible for any sales, use, VAT, GST, or similar taxes, except taxes on our net income. Taxes are calculated and collected through Stripe at checkout where applicable.

5.10 Chargebacks

If you initiate a chargeback that we determine to be without merit, we may suspend or terminate your account, claw back any credits associated with the disputed transaction, and seek to recover the amount plus any associated fees.

6. Acceptable Use

You agree not to use the Service, and not to authorize or assist anyone else to use the Service, to:

Illegal, harmful, or abusive use

violate any law, regulation, or third-party right, or facilitate any illegal activity;
infringe or misappropriate intellectual property, privacy, publicity, or other rights;
create, store, transmit, or solicit child sexual abuse material (CSAM), content sexualizing minors, or non-consensual intimate imagery (NCII);
harass, threaten, defame, dox, stalk, or facilitate violence against any person or group;
promote or incite hate, discrimination, or violence on the basis of protected characteristics;
generate, distribute, or use deepfakes or synthetic media that depict a real person without their consent in a misleading or harmful way;
impersonate another person or entity, or misrepresent your affiliation;
interfere with elections, voter registration, or democratic processes, including generating disinformation or unauthorized political microtargeting.

Dangerous capabilities

create, design, refine, or facilitate weapons capable of causing mass harm, including biological, chemical, radiological, or nuclear weapons (CBRN), high-yield explosives, or autonomous weapon systems;
create, distribute, or deploy malware, exploits, ransomware, or tools intended to gain unauthorized access to systems;
generate instructions intended to cause physical harm.

Privacy and data misuse

collect, scrape, harvest, or infer personal data about any person without a lawful basis;
conduct unlawful surveillance of individuals or groups;
de-anonymize or re-identify pseudonymous persons;
input regulated data (HIPAA-protected health information, payment card data subject to PCI-DSS, U.S. federal classified information, special-category personal data under Article 9 GDPR) unless we have signed a separate written agreement permitting that use.

Security and integrity of the Service

attempt to gain unauthorized access to the Service, any account, or any system;
interfere with, disrupt, degrade, or impose an unreasonable load on the Service;
bypass, disable, or circumvent rate limits, content filters, safety systems, authentication, or security features;
attempt to extract model weights, training data, system prompts, or proprietary instructions, or otherwise reverse-engineer the Service except where the law expressly allows it;
probe, scan, or test vulnerabilities except through coordinated disclosure at security@sauna.ai;
introduce viruses, worms, malware, or harmful code;
use the Service to attack, scan, or surveil third-party systems without authorization.

Misuse of integrations

violate the terms or rate limits of any connected service (including Google API Services, Slack, Anthropic, OpenAI, and other underlying providers);
exceed the scope you have been authorized to access;
send spam, phishing, or unsolicited bulk communications through any connected mailbox or messaging surface;
violate anti-spam laws (CAN-SPAM, CASL, GDPR/ePrivacy, TCPA, etc.).

Commercial misuse

resell, white-label, or sublicense the Service without our written consent;
share, sell, or transfer your account, credentials, or API keys;
use the Service to operate a competing AI product, or to benchmark, train, or fine-tune a competing model, without our prior written consent;
use the Service for high-risk applications where AI failure could lead to death, personal injury, or environmental damage (life-support, autonomous vehicles, critical infrastructure) without a separate written agreement with us.

You are responsible for the content you submit and for the actions Sauna takes on your behalf in connected systems, whether after your explicit approval or under agentic, scheduled, or autonomous features that you have enabled and configured.

Reporting and enforcement. Report suspected violations to abuse@sauna.ai. Violations may result in warning, content removal, feature restriction, account suspension, account termination, refusal of future service, retention of fees, and referral to law enforcement, in our sole discretion. We are not obligated to provide notice or appeal in every case. Where we suspend or terminate for violations of this Section 6, we are not obligated to provide a refund.

7. Third-Party AI Models and Sub-processors

The Service is powered by third-party providers, including AI model providers (such as Anthropic, OpenAI, Google, Groq, Perplexity, Cerebras, Together AI, Mistral, and Amazon Bedrock), infrastructure providers, payment processors, observability vendors, and integration brokers. A current list of these sub-processors, with regions, is described in our Privacy Policy.

You agree to comply with the usage policies of these providers as they apply to your use of the Service. We have configured providers to opt out of training on your content where opt-out is available; we do not knowingly route your content to providers that train on it.

8. AI Output and Agentic Actions; “As Is”; No Advice

Outputs of the Service are generated by AI and may be inaccurate, incomplete, biased, offensive, or unsuitable for your purpose. Outputs may resemble or coincide with content created by others; the same prompt may produce different outputs for different users. You are responsible for reviewing outputs before relying on them, sharing them, or sending them to third parties.

Agentic actions. When you enable agentic, scheduled, or autonomous features, you instruct Sauna to take actions in connected services on your behalf without an additional per-action approval. Sauna’s interpretation of context may be wrong; an action it takes (sending an email, posting a message, modifying a file, scheduling a meeting, navigating a browser, paying or moving funds in a connected service, etc.) may not reflect what you intended. By enabling these features, you accept that responsibility for those actions rests with you. You are expected to monitor results, configure scope, and disable or constrain features that produce outputs you do not want. We will provide reasonable controls (approvals, scopes, kill switches, audit logs); the choice to use them is yours.

No advice. The Service is not a substitute for professional advice. Nothing produced by the Service is legal, medical, financial, tax, accounting, or other regulated advice. Do not use the Service to make decisions in regulated, safety-critical, or high-stakes contexts without independent verification by a qualified professional.

9. Your Content and License

9.1 Ownership

You retain all rights you have in the content you submit to the Service (“User Content”) and in the outputs generated for you (“Outputs”), to the extent rights in AI-generated outputs are recognized by applicable law.

9.2 License to operate the Service

You grant HeyDaily a worldwide, non-exclusive, royalty-free license to host, store, copy, transmit, display, process, and modify User Content and Outputs solely as needed to: (a) provide, maintain, and secure the Service for you; (b) route content to the sub-processors necessary to fulfill your requests; (c) generate Outputs; (d) provide support; (e) enforce these Terms; and (f) comply with law.

9.3 No training on your content

We do not use User Content or Outputs to train generalized AI/ML models, and we do not permit our sub-processors to do so where an opt-out is available. We also do not create persistent copies, archives, or indexes of your content where prohibited by the applicable connected service’s API terms.

9.4 Service improvement

We may use aggregated, de-identified usage data (data that does not identify you or any person) to improve the Service.

9.5 Feedback

If you give us feedback, suggestions, or ideas about the Service, you grant us a perpetual, irrevocable, royalty-free, worldwide license to use them without restriction or compensation.

10. Our Intellectual Property

The Service, including all software, designs, trademarks, logos, and documentation, is owned by HeyDaily and its licensors and is protected by intellectual property laws. The “Sauna” name and logo are trademarks of HeyDaily Inc.; all other marks are property of their respective owners. We grant you a limited, non-exclusive, non-transferable, revocable license to access and use the Service per these Terms. We reserve all rights not expressly granted.

You may not copy, modify, distribute, sell, lease, or create derivative works of the Service, or attempt to extract source code or model weights, except to the extent expressly permitted by law.

11. Beta and Preview Features

Some features are labeled “beta,” “preview,” or “experimental” in-product. These features are provided “as is,” may change or be discontinued at any time, may have additional terms, and are not subject to any service-level commitment.

12. Copyright and DMCA

If you believe content on the Service infringes a copyright you own or are authorized to act on behalf of, send a notice to our designated copyright agent at copyright@sauna.ai that includes: (a) your physical or electronic signature; (b) identification of the copyrighted work; (c) identification of the allegedly infringing material with information sufficient to locate it; (d) your contact information; (e) a statement of good-faith belief that the use is not authorized; and (f) a statement, under penalty of perjury, that the information is accurate and that you are authorized to act. We will respond as required by 17 U.S.C. § 512, including providing counter-notice and repeat-infringer procedures. We may terminate the accounts of repeat infringers.

13. Privacy and Data Protection

Your use of the Service is governed by our Privacy Policy, which describes how we collect, use, disclose, and protect personal data, including the list of sub-processors, our Google API Services Limited Use commitments, retention, security, and your rights. Business customers and customers subject to GDPR, UK GDPR, or CCPA/CPRA who require a Data Processing Addendum can request one at privacy@sauna.ai.

14. Indemnification

You will indemnify, defend, and hold harmless HeyDaily and its officers, directors, employees, and agents from any third-party claim, demand, loss, liability, damage, cost, or expense (including reasonable attorneys’ fees) arising from or related to: (a) your User Content; (b) your use of the Service; (c) your violation of these Terms or applicable law; (d) your violation of any third-party right, including the terms of any connected service; or (e) actions Sauna takes on your behalf in connected systems, whether after your explicit approval or under agentic, scheduled, or autonomous features that you have enabled and configured.

15. Disclaimers

THE SERVICE IS PROVIDED “AS IS” AND “AS AVAILABLE,” WITHOUT WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, ACCURACY, AVAILABILITY, OR ARISING FROM COURSE OF DEALING. WE DO NOT WARRANT THAT THE SERVICE WILL BE UNINTERRUPTED, ERROR-FREE, OR SECURE, OR THAT OUTPUTS, OR ACTIONS TAKEN BY SAUNA ON YOUR BEHALF, WILL BE ACCURATE OR FIT FOR YOUR PURPOSE.

Some jurisdictions do not allow exclusion of certain warranties; in those jurisdictions, the disclaimers above apply to the maximum extent permitted by law.

16. Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY LAW: (a) HEYDAILY AND ITS AFFILIATES, OFFICERS, DIRECTORS, EMPLOYEES, AGENTS, AND LICENSORS WILL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, EXEMPLARY, OR PUNITIVE DAMAGES, OR FOR ANY LOSS OF PROFITS, REVENUE, DATA, USE, GOODWILL, OR OTHER INTANGIBLE LOSSES, ARISING FROM OR RELATED TO THE SERVICE OR FROM ANY ACTION SAUNA TOOK ON YOUR BEHALF, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. (b) OUR TOTAL CUMULATIVE LIABILITY ARISING FROM OR RELATED TO THE SERVICE WILL NOT EXCEED THE GREATER OF (i) THE AMOUNTS YOU PAID US FOR THE SERVICE IN THE 12 MONTHS PRECEDING THE EVENT GIVING RISE TO LIABILITY, OR (ii) USD $100.

These limitations apply to all claims, regardless of theory (contract, tort, statute, or otherwise), and including claims arising from agentic, scheduled, or autonomous features. Some jurisdictions do not allow these limits; in those jurisdictions, our liability is limited to the maximum extent permitted.

17. Term and Termination

These Terms apply from your first use of the Service until terminated. You may terminate at any time by closing your account. We may suspend or terminate your account or access at any time, with or without notice and with or without cause, including under Section 3. Sections that by their nature should survive (including Sections 5.7, 6, 8, 9, 10, 12, 14, 15, 16, 19, 20) survive termination.

Upon termination we may delete your User Content and Outputs after a reasonable period as described in our Privacy Policy. Export your content before termination.

18. Changes to these Terms

We may update these Terms from time to time. The current version is always available at sauna.ai/terms and the “Last Updated” date above shows when it was last revised. We encourage you to review these Terms periodically. Where required by law, we will notify you of material changes; otherwise, your continued use of the Service after an update constitutes acceptance of the revised Terms.

19. Governing Law, Arbitration, and Class Action Waiver

19.1 Governing law

These Terms are governed by the laws of the State of California, excluding its conflict-of-laws rules. The U.N. Convention on Contracts for the International Sale of Goods does not apply.

19.2 Informal resolution

Before filing a claim, you agree to try to resolve the dispute informally by contacting legal@sauna.ai. We will try to resolve the dispute by contacting you. If we cannot resolve a dispute within 60 days, either of us may bring a formal proceeding.

19.3 Binding arbitration

Any dispute arising from or relating to these Terms or the Service (other than disputes by either party about intellectual property, or by either party seeking injunctive relief) will be resolved by binding individual arbitration administered by JAMS under its Streamlined Arbitration Rules. The seat of arbitration is San Francisco, California. The arbitrator’s decision will be final and binding. Judgment may be entered in any court of competent jurisdiction.

19.4 Class action waiver

YOU AND HEYDAILY EACH WAIVE THE RIGHT TO PARTICIPATE IN A CLASS ACTION, CLASS ARBITRATION, OR REPRESENTATIVE PROCEEDING. The arbitrator may not consolidate claims and may not preside over any form of representative proceeding.

19.5 30-day opt-out

You may opt out of Sections 19.3 and 19.4 by emailing legal@sauna.ai within 30 days of first accepting these Terms with the subject line “Arbitration Opt-Out” and your account email.

19.6 Venue for excluded claims

For claims excluded from arbitration, the federal and state courts in San Francisco County, California have exclusive jurisdiction.

20. General

Assignment. You may not assign these Terms without our consent. We may assign them to an affiliate or in connection with a merger, acquisition, or sale of assets.
Force majeure. Neither party is liable for delay or failure to perform due to causes beyond its reasonable control.
No waiver. Our failure to enforce a provision is not a waiver.
Severability. If any provision is found unenforceable, the rest remain in effect; the unenforceable provision will be modified to the minimum extent necessary.
Entire agreement. These Terms and the Privacy Policy are the entire agreement and supersede prior agreements on the subject.
Notices. We may send notices by email to the address on your account or by in-product message. You may send notices to legal@sauna.ai.
Government use. The Service is “commercial computer software” as defined in 48 C.F.R. § 2.101.
Export. You may not use or export the Service in violation of U.S. or other applicable export controls or sanctions.

21. Contact

HeyDaily Inc., San Francisco, California, USA

Service: app.sauna.ai
General: support@sauna.ai
Legal: legal@sauna.ai
Privacy: privacy@sauna.ai
Security: security@sauna.ai
Abuse: abuse@sauna.ai
Copyright agent: copyright@sauna.ai