SheetTutor is a free Excel practice web app with interactive browser worksheets. Learners enter spreadsheet formulas, calculate results and check their answers in guided tasks. It also provides function references, original worked examples and downloadable practice workbooks. Learning content is in English, and no account is required to practise. Existing free lessons and exercises remain permanently free.
A quick view of this listing's freshness, engagement, stack, and trust signals. Traffic ratios are available to the maker in their dashboard. They describe recorded clicks per view, not a destination conversion rate.
Optional tools for the maker: strengthen listing signals, check the badge backlink, and review the destination site.
Open tools
Authority builder
Authority engine
This score tracks the signals that make a listing useful for discovery and trust. Payment is not part of the score, and the result does not guarantee ranking.
93
signal score
6/7 signals liveugc nofollow
Trust signals
7/13
Run the security scan and fix missing headers to make the listing more credible.
The check looks for a public link between the configured product site and this listing. It does not verify ownership, endorsement, or search ranking. Payment does not change search-link treatment.
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Security header check
Grade F · 12/100 · HTTP headers only · Checked 2026-11-01
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Checks the site's current HTTP response headers. This is not a penetration test or a general safety certification.
F
Score: 12/100
HTTPS/2 passed/6 missing
Scanned 1 Nov 2026, 12:58
Fix first
Prioritised header plan
Start with the highest-impact gaps, test the site, then re-run this check. The full list remains below.
Priority 1high
Strict-Transport-Security
Test before enforcing
Priority 2high
Content-Security-Policy
Test before enforcing
Priority 3high
X-Frame-Options
Usually quick
Action needed
Your app is missing critical security headers that protect users from XSS, clickjacking, and data leaks. Review the failing checks above, add the recommended headers to your server config, then click "Rescan". A stronger score helps you rank on the Security Leaderboard.
Why Security Scores Matter
AI makes it easy to build apps fast - but speed without security puts users at risk. We scan every listed app's HTTP headers to surface who's shipping responsibly. Security headers like HSTS, CSP, and X-Frame-Options are the baseline defenses every web app should have. A good score tells users: "this builder cares about my safety, not just shipping quickly."
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