Terms of Service.
The legal version of the four promises on the landing page, plus the details.
This is a draft. It has not yet been reviewed by an attorney. It is published for transparency while the account-backed production architecture is being finalized. A counsel-reviewed v1.0 will replace it before paid tiers launch. The four binding commitments below will not change; some surrounding legal language may be refined.
Read this in two minutes
- EngineHoursLog is a personal logbook. You record your own engine hours, parts, and maintenance. We don't tell you when to service your equipment — we help you remember what you decided to do.
- It's not for regulated use. We don't support aviation, commercial marine, commercial trucking, charter operations, or medical and life-safety equipment. If your maintenance records are required by law or regulation, this isn't the right tool.
- Your data is yours. Export everything, any time, in JSON, CSV, or PDF. Free on every tier. Works after cancellation.
- If we shut down, we give you a year. The export tool stays online for a minimum of twelve months after any shutdown announcement, and the format specifications are published publicly. You will never lose your log because we went out of business.
- We don't sell your data, run ads, or track you across the web. The product is funded by subscription revenue. That is the only way we make money from you.
- We won't quietly add regulated categories. Any change to the exclusion list requires a published explanation and twelve months' notice.
- You're responsible for your equipment. Our reminders are suggestions, not instructions. They are not recommendations from us and they are not a safety system.
- 60-day refund. If you decide this isn't for you within sixty days of paying, email us and we'll refund you. No questions.
1. Who we are
"EngineHoursLog," "we," "us," and "our" refer to EngineHoursLog — the service at enginehourslog.com and its installable progressive web application. The operating legal entity name, jurisdiction, and registered address will be added here before the paid tier launches.
"The Service" means the website, the web application, the synchronization and recovery service, email notifications, and any other software or service provided under the EngineHoursLog name.
"You" and "your" refer to the person or organization using the Service under an account.
2. What the Service is — and what it is not
2.1 What it is
A personal logbook for recording engine hours, parts, and maintenance events for equipment you own or are authorized to maintain. The Service includes offline local storage of your log data on your device; server-backed recovery for production accounts; optional active synchronization across devices; optional scoped, revocable sharing of a specific asset's log with another user; optional transfer of an asset's ownership with log history preserved; reminders computed from rules you define; templates of common components and intervals; and export in JSON, CSV, and PDF.
2.2 What it is not
The Service is not:
- A regulatory compliance tool;
- A replacement for any legally required logbook, maintenance record, or inspection document;
- A maintenance management system with professional recommendations;
- A safety system;
- A substitute for the judgment of a qualified mechanic, surveyor, inspector, or other professional;
- A guarantee that your equipment is safe to operate or has been correctly maintained.
Reminders produced by the Service are suggestions derived from the rules you entered and from manufacturer-interval templates that we provide for convenience. We do not recommend that you perform any specific maintenance at any specific time. You are responsible for determining what maintenance your equipment requires, when to perform it, and whether the equipment is safe to operate.
2.3 Excluded categories
The Service is not offered for, and you may not use it in connection with, any of the following:
- Aviation of any kind — fixed-wing aircraft, rotorcraft, gyroplanes, ultralights, and any other aircraft regulated by the U.S. Federal Aviation Administration (FAA) or an equivalent civil aviation authority.
- Commercial marine operations regulated by the U.S. Coast Guard or equivalent — including USCG-inspected vessels, commercial fishing above applicable tonnage thresholds, and vessels carrying passengers for hire.
- Commercial transportation regulated by the U.S. Department of Transportation, the FMCSA, or equivalent — including hours-of-service tracking for over-the-road trucking.
- Medical, life-safety, and emergency-backup equipment where maintenance records are part of regulatory compliance — hospital standby generators, dialysis equipment, fire-suppression systems, and the like.
- Any equipment or use for which a government body requires specific logbook formats, retention periods, signoff procedures, or audit trails.
We do not advertise, sell, or provide features for any of these uses. If you operate equipment in these categories, you must use a compliance-grade record-keeping system suited to your regulatory obligations.
2.4 If you use it for an excluded category anyway
You assume all risk and all consequences. We provide no assurances that the Service's data format, retention, or availability meets any regulatory requirement, and we expressly disclaim all liability for any regulatory, legal, financial, or safety consequences arising from such use.
2.5 Your responsibility for your equipment
Maintaining your equipment safely and correctly is your responsibility — or the responsibility of a qualified professional you engage. The Service helps you keep records. It does not inspect, test, certify, or recommend maintenance. Nothing in the Service replaces the judgment of a qualified mechanic, surveyor, or inspector.
3. Accounts
Accounts are required for every production tier, including Free. This protects users against device loss, app removal, browser data clearing, and phone upgrades.
Accounts are identified by an email address you control. Email is used for verification, recovery, and notifications; it is not the normal login mechanism. Authentication is passkey-first where supported. We do not store passwords, and we do not use magic-link email login as the primary authentication method.
You must be at least 18 years old, or the age of majority in your jurisdiction if older, to hold an account. If you create an account on behalf of an organization, you represent that you are authorized to bind that organization.
4. Your data
You own your data. Engines, assets, logs, part records, maintenance rules, notes, identifying metadata — all of it remains yours. We do not claim ownership. We process it only to provide the Service to you.
Offline-first storage. The application stores a working copy of your log data in your browser's IndexedDB so core logging works without network access. Local storage is for field use, not the only safety layer.
Server recovery copy. For every production tier, including Free, we store a copy of your log data on servers under our operational control so your log can be recovered after device loss, app removal, browser data clearing, or phone upgrades. We encrypt in transit and at rest where the underlying storage supports it. We do not sell, rent, or trade your data. Specific security representations will be finalized before production launch.
Export is always available (see Section 7.1).
Account deletion removes your personal data from our production systems. Backups are purged on a rolling schedule. We recommend exporting before deletion.
Processors. We use a small number of third-party services to operate — email delivery, payment processing (when paid tier launches), cloud infrastructure. Each receives only what it needs. A current list lives at enginehourslog.com/privacy#processors.
Law-enforcement requests are handled as required by law. Where legally permitted, we notify affected users before disclosing any personal data.
5. Ownership, sharing, and transfer of assets
An asset (a boat, RV, tractor, generator) is a logical record distinct from any user account, with its own ownership record and log history.
Mechanic sharing (paid tier) grants another user scoped, revocable access to a specific asset — read-only or read-write. Non-owner write actions are attributed in the log history. You may revoke the grant at any time.
Ownership transfer (paid tier) reassigns an asset to another email address. Full log history transfers. The previous owner's access is revoked. The transfer itself is recorded as an immutable entry.
Transfer on death. If an owner is deceased or permanently unable to access their account, a legal representative may contact support@enginehourslog.com with appropriate documentation.
Accuracy of transferred history. We do not warrant that a transferred asset's log history is accurate. It reflects what the prior owner or their authorized mechanic entered. Treat the log as one data source alongside a professional inspection — not as certified inspection data.
6. Subscriptions and payment
Free tier — one engine, account required, offline working copy, server recovery copy, full export, no mechanic sharing or ownership transfer. Free forever.
Paid tiers — not yet launched. Current planned pricing at enginehourslog.com/#pricing. Subject to refinement before launch; announced pricing will apply.
When paid tiers launch: billing is in advance (monthly or annually); price changes for existing subscribers require at least 30 days' notice; 60-day refund applies to new paid purchases and renewals; cancellation takes effect at the end of the current billing cycle; on non-payment the account reverts to Free tier (data preserved, no deletion); published prices do not include taxes.
7. Our binding commitments
These are the commitments the landing page makes. They are part of this agreement and may be enforced by you.
7.1 Your data is yours
Full export of your data in open formats (JSON, CSV, PDF) is available to every user, at any time, including after cancellation, free of charge. Export format specifications are publicly documented and versioned at enginehourslog.com/export-specs.
7.2 Shutdown guarantee
If EngineHoursLog ceases operations, we will (a) publish a shutdown announcement on enginehourslog.com and by email to every account holder; (b) keep the export tool online for a minimum of twelve months after the announcement; (c) publish the export format specifications publicly if not already published.
7.3 No advertising
The Service is funded by subscription revenue. We will not (a) display advertising in the Service; (b) sell, rent, or trade user data to third parties for advertising or marketing; (c) introduce an advertising-supported tier.
7.4 No drift into regulated categories
The excluded categories in Section 2.3 will not be added. Marketing will not target users in those categories. Any change to this commitment requires (a) a published explanation and (b) no less than twelve months' notice to existing account holders before the change takes effect.
8. Acceptable use
You agree not to use the Service to violate any applicable law, infringe intellectual-property rights, impersonate anyone, attempt unauthorized access, interfere with the Service, upload malware, or store data for an excluded category under Section 2.3 held out as satisfying a regulatory obligation.
9. Intellectual property
We own the Service — the code, the website, the templates, the documentation, the brand. We grant you a limited, non-exclusive, non-transferable license to use the Service for its intended purpose while this agreement is in effect. You retain all rights in the data you enter. If you send us feedback, we may use it without obligation to you.
10. Warranties and disclaimers
Except as expressly stated in this agreement — including Section 7 — 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, uninterrupted service, or freedom from error.
Reminders are suggestions, not recommendations, and not safety instructions. Templates describe common components and typical intervals and are not a representation that they are correct for any particular engine or operating environment.
11. Limitation of liability
To the maximum extent permitted by applicable law, our aggregate liability to you for any claim arising out of or relating to the Service or this agreement is limited to the amount you paid us in the twelve months preceding the claim, or $100, whichever is greater.
To the maximum extent permitted by applicable law, we are not liable for any indirect, incidental, consequential, special, exemplary, or punitive damages — including lost revenue, lost profits, lost business opportunity, loss of data (except as set forth in Section 7.2), damage to equipment, personal injury, or death — whether in contract, tort, strict liability, or otherwise, even if we have been advised of the possibility.
These limitations are an essential basis of this agreement.
12. Indemnification
You agree to indemnify and hold harmless EngineHoursLog and its officers, employees, and agents from any claim arising out of your use of the Service in violation of this agreement, your use in connection with an excluded category under Section 2.3, or your entry of data that infringes another person's rights.
13. Termination
You may terminate at any time by deleting your account. We may terminate or suspend an account for material violations of this agreement or when required by law. Sections 4 (ownership), 7 (commitments), 9 (IP), 10 (disclaimers), 11 (liability), 12 (indemnification), and 15 (governing law) survive termination.
14. Changes to these Terms
We may update this agreement to reflect changes in the Service or in applicable law. For material changes, we will post the updated version at enginehourslog.com/terms, notify existing account holders by email, and apply the change no sooner than 30 days after notice — except for legally required or security changes, which may take effect sooner.
Changes to Section 2.3 (excluded categories) and Section 7 (binding commitments) require twelve months' notice to existing account holders. This is itself a binding term.
Your continued use after the effective date constitutes acceptance. If you do not accept an update, you may terminate and, where the change affects a pre-paid billing cycle, request a pro-rated refund.
15. Disputes and governing law
To be finalized with counsel before the paid tier launches. Expected posture: U.S. state law (jurisdiction of the operating entity), courts in the operating jurisdiction with a small-claims carve-out, no mandatory arbitration. An EU/UK addendum will follow when meaningful international usage exists.
16. General
This agreement and any referenced policies are the entire agreement between you and us regarding the Service. If any provision is held unenforceable, the rest remain in effect. A delay or failure to enforce is not a waiver. You may not assign this agreement without our written consent; we may assign in connection with a merger, acquisition, or sale of assets — but no assignment may be used to evade the shutdown guarantee or the no-drift commitment.
16.1 Contact
- Support: support@enginehourslog.com
- Billing: billing@enginehourslog.com
- Security: security@enginehourslog.com
- General: hello@enginehourslog.com
Appendix · Summary of binding commitments
- Your data is yours. Export in open formats, free, any time, including after cancellation.
- Shutdown guarantee. Twelve months minimum of export tool availability; format specs published.
- No advertising, ever. No ads, no data sale, no ad-supported tier.
- No drift into regulated categories. Twelve months' notice and a published explanation required to change the exclusion list.