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ValU vs Mercari

ValU and Mercari both land on Depends.

ValU

val-u.app

Depends
Confidence: Low

Confidence is low: the only evidence found is the vendor's own pages plus an App Store listing, with zero independent reviews.

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Mercari

mercari.com

Depends
Confidence: Medium

Use it if you casually buy or sell secondhand items and accept a flat 10% fee plus imperfect support.

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ValU versus Mercari
CompareValUMercari
VerdictDependsDepends
Best forThrift flippers pricing finds in-storeCasual sellers clearing closets
Who it's not forProfessional resellers needing guaranteed-accurate comps . accuracy is unprovenHigh-volume professional resellers
PrivacyNo known public vulnerabilities found in the sources reviewed.²Legitimate service overall, but two improper-authorization CVEs (CVSS 7.5) and a 2021 Codecov-linked data breach are on record.12
Support qualityNo support evidence foundTrustpilot and BBB report unhelpful support
Public sentimentNo verifiable user reviews for this specific app were found . nearly all online 'Valu' reviews belong to unrelated companies.³Users like the app's simplicity and authentication, but many complain about fee changes, support quality, and seller treatment.⁸
Biggest gotchaGuess: 'free, no limits' is a claim, not a contract . free scanners commonly add paywalls later¹New fee structure since January 2025 added buyer fees; some sellers say it's no longer worth cross-posting⁷

Pick ValU when

  • Thrift flippers pricing finds in-store
  • Casual eBay and Mercari resellers
  • Sneaker, vinyl and trading-card collectors
  • Garage and estate-sale shoppers

When ValU is not a fit

  • Professional resellers needing guaranteed-accurate comps . accuracy is unproven
  • Anyone needing certified appraisals for insurance or estates
  • Teams wanting shared pricing or inventory tools . consumer app only
  • Buyers who insist on third-party-reviewed products . none exist yet

Pick Mercari when

  • Casual sellers clearing closets
  • Secondhand bargain hunters
  • Collectibles and hobby resellers

When Mercari is not a fit

  • High-volume professional resellers
  • Sellers needing responsive support
  • Thin-margin items where 10% kills profit

Sources

  1. How to Check Resale Value at a Thrift Store . Valuval-u.app
    official
  2. Valu . Product security pageval-u.app
    official
  3. valU: Resale Price Scanner . App Storeapps.apple.com
    official
  4. valU . Crunchbase (unrelated namesake, Egyptian fintech)crunchbase.com
    news
  5. Mercari customer service reviews . Trustpilottrustpilot.com
    review
  6. Is Mercari reliable? . Reddit r/Mercarireddit.com
    review
  7. Barely worth cross-posting anymore . Reddit r/Mercarireddit.com
    review
  8. Mercari App Store ratings & reviewsapps.apple.com
    review
  9. Mercari Review: Is Mercari Legit? . Crosslistcrosslist.com
    review
  10. Mercari Fees Explained . Crosslistcrosslist.com
    news
  11. Mercari Reviews and Ratings (2026) . Inquirerusa.inquirer.net
    news
  12. CVE-2021-20835 . NVDnvd.nist.gov
    security
  13. CVE-2024-23388 . VulDBvuldb.com
    security
  14. E-commerce giant suffers major data breach in Codecov incident . BleepingComputerbleepingcomputer.com
    security
  15. Buyer Protection . Mercari Helpmercari.com
    official
  16. Is Mercari legit? . Avastavast.com
    news