HoldMyTwist
Time zones explained for students
Convert between time zones in three steps. Follow visual examples of UTC offsets, daylight saving and date changes, then try three practice questions with answers.
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Guides
Plain-English guides to software, products and everyday decisions. Check what something costs, what it needs and where it falls short before you commit.
Check an AI citation before you use it
Find an AI-suggested scholarly reference, match it to the publisher, check for updates and read the passage that supports your claim. A free Crossref and PLOS walkthrough.
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Restore a deleted file from Proton Drive Trash
Recover a file from Proton Drive Trash, check its original folder and content, and avoid confusing deletion with version history.
Use map in Make to extract matching email addresses
Extract one field from matching records in Make Free. Use a fictional contact list, select the right keys, and check the resulting array.
Restore a deleted item in Proton Pass Free
Recover an item from Proton Pass Trash, check the restored details, and see why restoring a deleted item does not undo edits.
Remove duplicate tags from an array in Make
Use deduplicate in Make Free to remove repeated tags. Check case differences and empty values, and understand why this does not prevent repeat runs.
How to choose a power bank you can fly with
Rules introduced by the International Civil Aviation Organization on 27 March 2026 limit passengers to two power banks and prohibit recharging them on board; implementation depends on the country. Check your airline's rules before flying. Read watt-hours, usable capacity and output, and check for recalls.
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Is Proton VPN Free enough? Check these limits
Check Proton VPN Free country choice, device limits and streaming support, then follow the Free signup option through the paid offer screen.
Check a photo's Content Credentials before you share it
Read an image's recorded AI use, edits and issuer with the free Verify tool. Learn why missing credentials and a signed history cannot settle whether a photo is true.
Set up a password-protected email in Proton Mail Free
Prepare a password-protected message for a non-Proton recipient, check expiry and understand the extra step needed on later replies.
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Make Array aggregator: combine records into one list
Regroup two records into one array in Make Free. Choose the source and fields, expand both output items, and check what remains available later.
Save and find a note in Proton Pass Free
Create a fictional note in Proton Pass Free, edit it, and check that it remains saved after reloading the web app.
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Make Text aggregator: combine order lines into one summary
Combine two order records into one readable summary in Make Free. Choose the source, add a line break, and inspect the result without sending it.
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How to redact a PDF and check the saved result
Use a free PDF redaction tool, cover text inside pictures, then check the downloaded file. See what our fictional test removed and what image-only output loses.
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Help your child learn with AI: a parent's guide
Set family AI rules, check an answer together and find out what your child learned. Includes paper citations, real screenshots and an offline option.
Compare two small CSV files by ID and check the changes
Compare two small CSV exports by ID with RowSlice. Use the practice files to check added, removed and changed rows, and spot blank or repeated IDs.
Create CSV text from separate records in Make
Combine two records into one CSV text output in Make Free. Choose fields and headers, then check the quoted comma before saving a real export.
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Create a free QR code and save it as SVG
Create a direct-link QR code without an account, save the SVG and check the destination before sharing or printing. Includes our verified export result.
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Check a domain's renewal cost before you buy
Find the renewal price for the exact domain you want, check premium rates and extras, and compare three-year costs before you register.
Find an email with Proton Mail search filters
Narrow a Proton Mail search by folder, date, sender or attachments. Use a saved practice draft and check the matching result.