shouldiuse.io

VERDICT

Should I use Mountain Duck?

Cyberduck for mounting volumes in the file explorer. Available for Mac and Windows. - mountainduck.io

Depends. Buy it if you need S3, SFTP, or B2 storage mounted as a real disk and native sync apps don't cover you. Skip it if Dropbox/Drive/OneDrive clients already work, or if you need bulletproof large transfers.

Confidence

Medium. Based on 14+ public sources: vendor docs, Capterra/SourceForge/MacUpdate reviews, Reddit threads, GitHub issues, and 2025 CVE advisories.

Ratings

  • Value for money
  • Ease of use
  • Feature depth
  • Support quality
  • Security posture

Pricing

$39 one-off

Single license

ModelNot disclosed
Monthly feesNot disclosed
HardwareNot disclosed
Free tierNo
Mountain Duck 5$49/user

Best for

  • Freelancers mounting S3/SFTP/B2 as a disk
  • Mac users juggling multiple cloud providers
  • Selective-sync and Cryptomator encryption users
  • Cyberduck fans wanting Finder access

Not for

  • Anyone happy with native Dropbox/Drive/OneDrive clients
  • Spotlight-reliant Mac users — no Spotlight integration
  • Teams moving huge datasets — large SFTP uploads report issues
  • Buyers who hate subscription licenses — the App Store edition is one

Gotchas - check before you buy

high

Pricing model flipped: App Store v5 is subscription; a forum thread calls the switch 'actual scam'

medium

Direct license vs App Store edition differ — perpetual vs subscription. Check before buying

medium

Very large SFTP transfers reported problematic; bulk jobs may need a dedicated tool

low

Upgrade path: 30% discount only if you own a previous version

Pros and cons

Pros

  • Mounts S3, SFTP, WebDAV, Backblaze B2, OneDrive as a local disk
  • Selective sync and Cryptomator encryption get specific praise
  • Called 'fairly priced' with a one-off license
  • 'Getting started is very easy' per MacUpdate review
  • Reddit users find it more reliable than CloudMounter

Cons

  • No Spotlight integration; very low wait timeouts
  • Longtime reviewer verdict: 'works only sometimes'
  • M1 issues made it 'almost unusable' for one user
  • Windows 11 crashes; 1.15TiB SFTP upload problems reported
  • Known bugs editing files via Adobe Acrobat Reader

Sources & method

Analyzed 9/20/2026 - 14 sources - Two high-severity 2025 CVEs around TLS certificate handling, since patched; no dedicated security page found.

official x3review x6security x4news x1
  • CVE-2025-41255 — improper TLS certificate handling, High-severity (CVSS ~8); unrestricted TLS certificate handling in Cyberduck and Mountain Duck.
  • CVE-2025-41256 — weak hash for certificate fingerprint, CVSS 7.4; weak hash algorithm for certificate fingerprints. Fixed in a later version.

Key stats

  • Value for money: 4/5

    Rating

  • $39 one-off

    Starting price

  • 14

    Sources

  • Analyzed

  • Value for money: 4/5. 'Fairly priced' one-off; App Store subscription angers buyers
  • Ease of use: 4/5. 'Getting started is very easy' per MacUpdate review
  • Feature depth: 3/5. Capterra features score is 3.0/5
  • Support quality: 4/5. Capterra customer service score 4.0/5
  • Security posture: 2/5. Two high-severity 2025 CVEs; no security page found
  • $39 one-off Starting price v5 listed at $49/user
  • No Free tier ExpanDrive is free for personal use
  • 4.0/5 Capterra support rating Features rated 3.0/5
  • 5 Latest version App Store edition is subscription

Pricing

Single license

$39 one-off

  • Perpetual license
  • Install on multiple computers

Mountain Duck 5

$49/user

  • Latest version
  • App Store edition is subscription

Security

Two high-severity 2025 CVEs around TLS certificate handling, since patched; no dedicated security page found.

  • CVE-2025-41255 — improper TLS certificate handlingHigh-severity (CVSS ~8); unrestricted TLS certificate handling in Cyberduck and Mountain Duck.
  • CVE-2025-41256 — weak hash for certificate fingerprintCVSS 7.4; weak hash algorithm for certificate fingerprints. Fixed in a later version.

What users say

Users love cloud storage appearing as a local disk, but stability complaints and the pricing-model switch split sentiment sharply.

“Overall a very impressive tool which is fairly priced”
BestBackupReviews review
“Pretty lame duck. A software that works only sometimes”
SourceForge review
“I realy like the selective synchronization”
Capterra Canada review
Full analysis

Based on 14+ public sources: vendor docs, Capterra/SourceForge/MacUpdate reviews, Reddit threads, GitHub issues, and 2025 CVE advisories.

Solid $39 cloud-as-disk mounter, but mixed stability reports and a resentful pricing switch. Try free Cyberduck first.

Methodology

Based on 14+ public sources: vendor docs, Capterra/SourceForge/MacUpdate reviews, Reddit threads, GitHub issues, and 2025 CVE advisories.

Sources

  1. Mountain Duck official sitemountainduck.io
    official
  2. Mountain Duck Buy pagemountainduck.io
    official
  3. Known Issues — Cyberduck docsdocs.cyberduck.io
    official
  4. Mountain Duck Review — BestBackupReviewsbestbackupreviews.com
    review
  5. Mountain Duck for macOS Review — MacUpdatemacupdate.com
    review
  6. Mountain Duck Reviews — Capterracapterra.com
    review
  7. Mountain Duck Reviews — SourceForgesourceforge.net
    review
  8. Mountain Duck 5 Review — TheSoftware.Shopthesoftware.shop
    review
  9. Transmit 5 or Mountain Duck 4? — Reddit r/macappsreddit.com
    review
  10. Mountain Duck is actual scam — MacRumors Forumsforums.macrumors.com
    news
  11. GHSA-688c-vjrc-84rv — Weak hash for certificate fingerprintgithub.com
    security
  12. CVE-2025-41255 — TLS certificate handlingstrix.ai
    security
  13. Mountain Duck M1 issues — GitHub #11655github.com
    security
  14. Issues with large SFTP uploads — GitHub discussiongithub.com
    security

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