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Last updated · July 12, 2026

Terms of Service

These terms govern your use of Signum. By signing in, installing the extension, installing the add-on, or accessing the API, you agree to them. If you don’t agree, don’t use Signum.

We’ve written them in plain English where possible. Where legal phrasing is required (warranties, indemnity, liability), we’ve kept it tight and added explanatory notes.

1. The service

Signum is an email-engagement intelligence platform for Gmail, operated by Axiom Tech Lab (“Signum”, “we”, “our”), a sole-proprietorship registered in Bengaluru, Karnataka, India.

Signum runs agents (Watcher, Followup, Remind, Track, and others as released) on your Gmail account, with your OAuth authorization, to provide engagement intelligence and inbox automation. Signum is delivered via:

  • app.signum.email — the web dashboard.
  • Signum Chrome extension — published in the Chrome Web Store.
  • Signum Workspace add-on — published in the Google Workspace Marketplace.
  • api.signum.email — the REST API.

2. Eligibility and account

To use Signum, you must:

  • Be at least 16 years old.
  • Have a valid Google account in good standing.
  • Have authority to bind your organization if signing up on its behalf (creating a workspace under a company name binds the company).
  • Provide accurate, current information.

You are responsible for the security of your Google account. We are not liable for unauthorized access caused by your own credential compromise. If you believe your account has been compromised, write to [email protected] immediately.

3. Acceptable use

You agree NOT to use Signum to:

  • Send unsolicited bulk email (spam) of any kind. Signum is for individual outreach and small-team sales, not for cold-email blasts to scraped lists.
  • Harass, threaten, intimidate, defame, or stalk any recipient.
  • Violate any anti-spam or privacy law in your jurisdiction or your recipient’s: CAN-SPAM (US), CASL (Canada), GDPR (EU), UK GDPR, PECR (UK), DPDP (India), LGPD (Brazil), Spam Act (Australia), or others.
  • Send phishing emails, malware, ransomware, or content exploiting any vulnerability.
  • Track recipients on a suppression list or who have explicitly opted out.
  • Bypass, disable, or interfere with rate limits, abuse protections, or security features.
  • Resell, sublicense, or rebrand Signum without our written permission.
  • Reverse-engineer Signum, except as permitted by applicable law (e.g. interoperability research).
  • Use Signum in a way that violates Google’s Gmail or Workspace API terms.
  • Use Signum to compete with us by building a substantially similar product.
  • Misrepresent your identity or the source of any email sent through Signum.
  • Send content that is unlawful, fraudulent, deceptive, infringing, obscene, or hateful.

For clear-cut violations (spam, phishing, illegal content), we may suspend or terminate without notice and notify relevant authorities. For ambiguous cases, we’ll reach out first.

4. Your data; our role

You retain ownership of every email you send, every recipient you track, every rule you create, and every byte you load into Signum. We process that data on your instructions as your processor — see the Privacy Policy for the full description.

You’re responsible for complying with laws applicable to you and your recipients — including consent collection, opt-out handling, and any disclosures required in your jurisdiction (e.g. disclosing tracking in cold outreach under GDPR). Signum provides the tooling; you hold the contract with the recipient.

5. Plans, limits, and billing

Signum has four plans: Free, Basic, Standard, Premium. Current pricing and limits at signum.email/pricing are part of these terms by reference.

  • USD billing: handled by Stripe. Charges exclude applicable taxes.
  • INR billing: handled by Razorpay, with 18% GST included.
  • Auto-renewal: paid plans renew on the anniversary of first paid charge. We email a reminder 7 days before.
  • Cancellation: anytime, from billing settings. Drops to Free at the end of the current period; data preserved.
  • Refunds: at our reasonable discretion; usually issued for cancellations within 7 days of payment. Not refunded for periods used.
  • Payment failure: 7-day grace period with retries. After 7 days, downgrade to Free; no service suspension during grace.
  • Disputed charges: write to [email protected]. Don’t chargeback until we’ve had a chance to resolve.

6. Fair use

Premium’s “unlimited” trackings and actions carry a published fair-use ceiling: approximately 10,000 trackings and 30,000 agent actions per month. We publish this openly so you know what you’re getting. Exceed it, we’ll reach out and discuss — usually a custom plan, never an unannounced rate-limit. We will not silently degrade service to stay under a ceiling.

7. Trial

New workspaces get 14 days of Premium-tier access, free, no card required. At trial end, the workspace converts to the plan you selected (Free if nothing selected). Trial data is preserved on conversion. You cannot get more than one trial per workspace owner.

8. Beta features

Some features are released as beta. They are clearly labeled in the UI. Beta features:

  • May change, break, or be removed without notice.
  • Are provided AS-IS with no SLA, even on paid plans.
  • Are not covered by the uptime target in §10.
  • May have separate additional terms displayed when you opt in.

9. Suspension and termination

You may terminate any time by deleting your account from Settings → Account. On termination, we:

  • Stop billing immediately.
  • Delete sender data within 30 days (anonymize recipient tracking data, removing PII).
  • Stop processing recipients’ data within 7 days.
  • Honor pending DSARs or grievance redressals before deletion completes.

We may terminate:

  • For cause — material breach, fraud, abuse, or violation of law — immediately, no obligation to refund unused portions.
  • For convenience — with 60 days’ notice. If we shut down Signum entirely, we give 90 days and a data-export tool.

Suspension (without termination) may apply during investigation of a suspected breach. We will restore access if the suspicion is not borne out.

10. Service availability

We aim for high availability but make no specific uptime guarantee on Free and introductory plans. For paid plans, the target is 99.5% monthly uptime, excluding planned maintenance, measured against the Signum status page (when it launches).

If we miss this target in any month, request a pro-rated service credit by emailing [email protected] within 30 days of the incident. Credit is our sole and exclusive liability for any uptime miss.

11. Intellectual property

Signum, the Signum mark, the dashboard, the agents, all related software and content are owned by Axiom Tech Lab. We grant you a non-exclusive, non-transferable, revocable license to use Signum for the duration of your active subscription, subject to these terms.

Anything YOU put into Signum (rules, templates, contacts, etc.) remains yours. You grant us a license to process it solely to operate the service.

We respect third-party IP rights. If you believe content in Signum infringes your copyright, send a DMCA-compliant notice (or local equivalent) to [email protected].

12. Feedback

If you send us feedback, suggestions, or feature requests: you grant us a perpetual, irrevocable, royalty-free, worldwide license to use it without restriction or attribution. Standard SaaS clause — we don’t want to be liable if a suggestion we receive from you happens to overlap with something we were already planning.

13. Third-party integrations

Signum integrates with third-party services (Google Workspace, Stripe, Razorpay, etc.). Your use of those services is governed by their terms, not ours. We’re not responsible for outages, breaches, policy changes, or service decisions made by those providers.

If you connect a third-party service to Signum (e.g. via webhook or API key), you authorize the data flow between Signum and that service. Disabling the integration revokes the authorization going forward.

14. Warranties and disclaimers

We provide Signum “AS IS” and “AS AVAILABLE.” To the maximum extent permitted by law, we disclaim all warranties, express or implied, including warranties of merchantability, fitness for a particular purpose, non-infringement, and accuracy.

Signum is a young product. Bugs and outages happen. Email tracking has inherent limits (Apple MPP, image-blocking, network-level blocks) that we describe honestly but cannot eliminate. We do NOT warrant that:

  • Signum will catch every open or never miss one.
  • Signum will be uninterrupted, error-free, or completely secure.
  • The information Signum produces (engagement scores, verdicts) is always correct.
  • Defects will be corrected or that bugs you report will be fixed in any specific timeframe.

Some jurisdictions don’t allow some warranty disclaimers. In those places, our warranties are disclaimed to the maximum extent permitted.

15. Limitation of liability

To the maximum extent permitted by law, our total cumulative liability for any claim arising out of or related to Signum is limited to:

  • The amount you paid us in the 12 months immediately preceding the claim, or
  • ₹5,000 (approximately $60 USD),

whichever is greater.

In NO event are we liable for indirect, incidental, consequential, special, exemplary, or punitive damages — including lost profits, lost revenue, lost data, loss of goodwill, or business interruption — even if we’ve been advised of the possibility.

These limitations apply regardless of the legal theory (contract, tort, statute, strict liability, or otherwise) and survive termination of these terms.

Some jurisdictions don’t allow these limitations. In those places, our liability is limited to the maximum extent permitted.

16. Indemnification

You agree to defend, indemnify, and hold harmless Signum, Axiom Tech Lab, and our employees and contractors against any claim arising out of:

  • Your use of Signum in violation of these terms or applicable law.
  • Content you sent through Signum — the emails themselves, the recipients you targeted, the claims you made.
  • Any third-party claim that your use of Signum violated their rights (privacy, IP, or otherwise).
  • Your failure to obtain or maintain any required consents from your recipients.

We’ll notify you of any such claim promptly. You get to control the defense (with counsel reasonably acceptable to us) and we’ll cooperate at your reasonable request and expense.

17. Force majeure

Neither party is liable for failure to perform due to events beyond reasonable control: natural disasters, war, terrorism, civil unrest, government action, labor disputes, widespread internet or power outages, pandemics, or third-party service failures (Google, Cloudflare, Neon).

The affected party will give prompt notice, use reasonable efforts to mitigate, and resume performance as soon as practical. If force majeure persists for more than 60 days, either party may terminate without penalty.

18. Governing law and disputes

These terms are governed by the laws of India, without regard to conflict-of-laws principles. The UN Convention on Contracts for the International Sale of Goods does not apply.

Any dispute that can’t be resolved by good-faith discussion will be subject to the exclusive jurisdiction of the courts of Bengaluru, Karnataka, India. You consent to that jurisdiction and waive any objection of inconvenient forum.

If you’re a consumer in a jurisdiction with non-waivable rights (EU, UK, India Consumer Protection Act, certain US states), those rights are not affected by this section.

19. Modifications

We may update these terms when our service or obligations change. Material changes get 30 days’ email notice to all account holders. Continued use after the notice period means acceptance. If you don’t accept, you can cancel without penalty before the new terms take effect.

Non-material changes (typos, clarifications, restructuring) take effect on update. The version history is on file and available on request.

20. Assignment

You may not assign or transfer these terms without our written consent. We may assign these terms (and your subscription) in connection with a merger, acquisition, sale of assets, or other corporate transaction, with notice to you. If the assignee’s practices materially change the deal, you can terminate without penalty within 30 days of notice.

21. Notices

Notices to YOU: by email to the address on your account. You agree that electronic notice is sufficient.

Notices to US: by email to [email protected] AND by post to:

Axiom Tech Lab
Attn: Legal
Bengaluru, Karnataka, India
(Full address available on request — please email first.)

22. Export controls and sanctions

Signum may be subject to export-control laws (US EAR, EU dual-use regulation, etc.). You confirm that you are not on a sanctions list and will not use Signum in violation of any applicable export-control or economic-sanctions law.

23. Severability and waiver

If any provision of these terms is held unenforceable, the rest remain in effect. Our failure to enforce any provision is not a waiver of our right to enforce it later.

24. Entire agreement

These terms, together with the Privacy Policy and any executed DPA, are the entire agreement between you and Signum regarding the service. They supersede any prior understanding (oral, written, or implied) on the same subject. Purchase orders, MSAs, or forms you send us that contain additional or conflicting terms are not binding on us unless we sign them.

25. Survival

Sections that by their nature should survive termination, survive — including intellectual property, indemnification, limitation of liability, warranties, disclaimers, governing law, dispute resolution, and these survival terms themselves.

26. Contact

General: [email protected]

Support: [email protected]

Legal: [email protected]

Billing: [email protected]