Terms of Use

These Terms of Use govern your access to and use of the Quartenson website. They apply to the website only and do not govern Quartenson mobile applications, which have their own app-specific legal pages.

If you have questions, contact support@quartenson.com.

Website Accounts

You may optionally create a website account using your email, password, and a unique nickname. The nickname is stored in readable form and is not encrypted. By selecting the agreement checkbox during registration, you accept these Terms of Use. Keep your password private and use an email address you control. Do not impersonate another person or attempt to access another person's account.

When you are signed in, supported completed-session summaries are saved to your account. Guest completion history remains in this browser. You can review and import local summaries from the account page or a tool page. The account stores dates, selected tool settings, numeric results, and for reading practice the passage identifier and version. It excludes passage text, answers, prompts, private notes, and other practice material. After the server confirms each imported record was added or already present, that record is removed from this browser.

A reviewed import enables automatic importing of future guest summaries for this account and browser. Earlier imported history also enables automatic importing when the profile loads in a browser with no saved choice. A previously saved manual-only choice remains in effect, and a different account always requires review. If a signed-in save cannot reach the server, its summary may be held temporarily in an IndexedDB retry queue in this browser. Each queued item is tied to its account, retried only for that account, and removed after server acknowledgement. Saved tool preferences are not synchronized. Guest practice remains available. Website accounts do not grant mobile-app purchases or Premium entitlements. Contact us for account assistance or deletion requests.

The account may display XP and levels as a profile statistic. Each level requires 100 XP. Only a new account completion accepted with valid server-issued session proof can earn XP. Guest completions, imported history, duplicate submissions, and completions saved before XP was introduced earn no XP. The server checks the account, tool, settings, completion counters, and elapsed time before an award. XP awards are not transferable and do not unlock features or provide other benefits. Validated completion timing is used in aggregate to calibrate awards across tools and settings. XP proof excludes custom practice content. Awards may include a limited daily bonus. Technical checks help reduce tampering and replay, but a browser-based tool cannot prove that a person used the official interface for every submitted session. We may withhold or correct XP when we identify abuse or invalid records.

1. Informational Use

This website is provided for general informational purposes, including product information, company details, and educational content. You use the website at your own discretion.

2. Browser Tools, Local History, and Benchmarks

Quartenson browser tools are free practice and self-tracking tools. They are not medical devices, clinical tests, diagnostic tools, driving-safety assessments, or guarantees of cognitive improvement. Results can be affected by device performance, browser behavior, screen size, input method, interruptions, fatigue, and other context.

Guest sessions, personal bests, settings, and daily practice activity may be stored in this browser. Signed-in session summaries are saved to your account. If a save is temporarily offline, its aggregate summary may stay in an account-bound IndexedDB retry queue until the server acknowledges it. If that queue is unavailable, the local history record remains for later review or import. Local guest history can be reviewed; each confirmed imported record is then removed from this browser.

Some tools may also submit anonymized completion metrics for the current finished session so the website can show community benchmark distributions. These submissions use only allowed setup fields and current-session result metrics, such as tool mode, difficulty, sample size, completion time, response time, accuracy, or similar tool-specific values. When signed in, the completion is saved to your account and a compact personal-best result may be returned. Your full history is fetched only when you open tool history, the account page, or your personal benchmark. Guest history remains in this browser, while some tools may send the current anonymized result to community benchmarks. Historical imports are reviewed separately, and the account page explains the automatic import choice.

Benchmarks are approximate informational comparisons. Quartenson may seed initial benchmark data, aggregate results, cache benchmark statistics, validate incoming metrics, ignore invalid or out-of-range results, rate-limit requests, change benchmark thresholds, or remove benchmark features to protect service quality and data integrity. Benchmarks are not public rankings or leaderboards.

Do not intentionally spam benchmark requests, tamper with submitted metrics, automate abusive traffic, attempt to identify other users from aggregate benchmark data, or interfere with the website's normal operation.

3. External Links and Embedded Media

The website may link to or embed third-party services, including app stores, hosted forms, external websites, and YouTube players. Those services are operated by third parties, and we are not responsible for their availability, content, or practices. Your use of an embedded player is also subject to the third party's terms and policies.

4. Availability and Service Providers

We do not guarantee that the website will always be available, uninterrupted, secure, or error-free. We may update, suspend, or remove parts of the site at any time without notice.

Quartenson uses hosting, database, delivery, security, monitoring, and infrastructure service providers to operate and protect the website and related private API routes. These providers may process standard network metadata as needed to deliver the service, prevent abuse, monitor reliability, and troubleshoot operational issues. The public legal pages describe provider categories and purposes without listing exact infrastructure vendor names.

5. Intellectual Property

Unless otherwise stated, the website content, design, branding, copy, graphics, and code are owned by Quartenson or used with permission. You may not reproduce, republish, or distribute website materials without our prior written consent, except where allowed by applicable law.

6. Cookies Used on This Website

The Quartenson website uses a small set of cookies and related measurement storage for site functionality and, according to your consent choices, website analytics or ads measurement.

• quartenson-theme remembers the light or dark theme you selected so the website keeps your preferred appearance after a page reload or later visit.
• quartenson-consent-v2 remembers your consent choices so the banner does not keep appearing on each page load and so Google measurement storage follows your preferences.
• quartenson-cookie-notice may remain from an older version of the cookie notice for visitors who previously accepted it.
• quartenson-analytics-disabled, if you set it, disables website analytics requests including anonymous first-party consent-preference checks.
• quartenson-schulte-table-history-v1 may be stored in your browser local storage when you use the Schulte table tool. It keeps the last 30 completed sessions per table size and mode, plus personal bests, on your device only.
• quartenson-visual-search-history-v1 may be stored in your browser local storage when you use the Visual Search tool. It keeps the last 30 completed sessions per mode and difficulty, plus personal bests, on your device only.
• quartenson-visual-memory-history-v1 may be stored in your browser local storage when you use the Visual Memory tool. It keeps the last 30 completed sessions per mode and difficulty, plus best levels, on your device only.
• quartenson-reaction-time-history-v1 may be stored in your browser local storage when you use the Reaction Time tool. It keeps the last 30 completed sessions per sample size, plus personal bests, on your device only.
• quartenson-peripheral-awareness-history-v1 may be stored in your browser local storage when you use the Peripheral Awareness tool. It keeps the last 30 completed sessions per difficulty and measurement count, plus best consistency records, on your device only.
• quartenson-story-chain-history-v1 may be stored in your browser local storage when you use the Story Chain Memory Trainer. It keeps the last 30 completed-session summaries, including list source and length, recall scores, attempts, duration, and whether the word bank was used. It does not store the generated or custom words or optional private story notes.
• quartenson-peg-system-history-v1 may be stored in your browser local storage when you use the Peg System Memory Trainer. It keeps the last 30 aggregate session summaries, including list source and length, unaided recall, hints, attempts, recovery, and duration. It does not store targets, answers, associations, private notes, or prompt order.
• quartenson-chunking-history-v1 may be stored in your browser local storage when you use the Chunking Memory Trainer. It keeps the last 30 aggregate session summaries, including material type, list length, exact-position recall, complete chunks, recovery, attempts, and duration. It does not store source items, answers, private chunk cues, group labels, or item order.
• quartenson-keyword-method-history-v1 may be stored in your browser local storage when you use the Keyword Method Memory Trainer. It keeps the last 30 aggregate session summaries, including source, pair count, first and best mastered-pair counts, forward and reverse recall, recovered pairs, keyword-hint use, attempts, and duration. It does not store target terms, keywords, meanings, interaction notes, pronunciation data, answers, pair IDs, or prompt order.
• quartenson-tool-settings-v1 may be stored in your browser local storage to remember browser-tool settings such as table size, mode, difficulty, sample size, measurement count, list or pair count, material source, number size, and display preferences on your device only.
• quartenson-tool-activity-v1 may be stored in your browser local storage to show a lightweight daily practice summary across the free browser tools. It keeps completion counts by tool and day, first and last completion times for that local day, and whether a local best improved. It does not store full result history and is kept on your device only.
• _ga may be set by Google/Firebase Analytics only after Analytics consent to distinguish visits and help measure aggregate site usage.
• _ga_<measurement-id> or similar Google/Firebase measurement cookies may be set only after Analytics consent to maintain session and page measurement for the Quartenson website.
• _gcl_au or similar Google Ads measurement cookies may be set only after Ads measurement consent for conversion measurement and ad attribution. Exact names may vary as Google updates its measurement implementation.

Quartenson does not currently use personalized advertising or remarketing on this website. Personalized-ad consent remains denied unless that feature is explicitly introduced later.

Guest tool histories are optional browser-side progress data. They are not accounts and are not sent to analytics or advertising services. You may review and import supported summaries into an account. Confirmed imports are removed from this browser. A reviewed import enables later guest summaries to be automatically imported to the same account. Earlier imported history also enables this when the profile loads in a browser with no saved choice. Each queued signed-in save is temporarily kept in IndexedDB, tied to its account, and deleted after the server confirms the save. You can also clear guest histories from a tool's History dialog or your browser settings.

Browser-tool settings stored in local storage are used only to keep your selected tool preferences after page refreshes. Quartenson does not collect or upload these local settings.

Daily practice activity stored in local storage is used only to show your local progress across the free browser tools. It is not synced, uploaded, or used for analytics or backend requests. Daily activity counters are not included in the account history import.

Anonymous community benchmark submissions are separate from local storage. They submit only allowlisted metrics for the current finished session and do not upload local history, settings history, daily activity, or local personal-best records.

7. Website Analytics and Interaction Measurement

Quartenson uses Google Consent Mode v2 with consent-denied defaults. Before you make a choice, Google tags may load in consent-denied mode and send limited cookieless signals designed to respect your selected preferences. Analytics and advertising cookies are not set before consent.

If you grant Analytics consent, Quartenson may use Google/Firebase Analytics to measure aggregate interaction data on the website. This can include page visits, article views and engagement signals, navigation usage, button clicks, card clicks, consent preference actions, and clicks that open important external resources such as beta signup or feedback forms.

Tool completion analytics may include lightweight result summaries such as grid size, completion time, mistake count, accuracy, difficulty, sample size, measurement count, or similar session metrics. These summaries are used to understand tool usage and are not read from local history storage.

If you grant Ads measurement consent, Google Ads measurement may be used for conversion measurement and ad attribution. This does not enable personalized ads or remarketing.

You can accept all optional measurement, reject all optional measurement, customize categories, and later change or withdraw your choices from the Cookie settings link in the website footer.

Quartenson may also send an anonymous first-party request to its own API when consent preferences are saved, storing only a server-created timestamp. Browser tools may also send anonymized completion metrics after a finished session so anonymous result benchmarks can be shown. The benchmark payload does not include visitor identifiers, accounts, cookies, IP addresses, user agents, referrers, sessions, client timestamps, form contents, or local history. These requests are separate from Google Analytics.

The website may include a first-party feedback form, including from the footer or specific tool pages. If you submit it, Quartenson stores only the feedback text and short internal source label, plus the optional email address you choose to provide, so the website and tools can be improved.

Consented measurement is used to understand how visitors use the site, improve content and page structure, and evaluate which product and article paths are most useful. It is not used by Quartenson for personalized advertising.

8. Changes to These Terms

We may revise these Terms of Use from time to time. Updated terms will be posted on this page with a revised "Last updated" date.

9. Contact

Questions about these website terms can be sent to support@quartenson.com.