1 Best Open-Source Alternatives to Sync.com in 2026
By Noahlast updated pricing verified
Compared: open-source alternatives to Sync.com
| Alternative | Best for | Standout | Biggest weakness | Learning curve | Price |
|---|---|---|---|---|---|
| Sync.comreference | privacy-conscious individuals and regulated businesses (legal, healthcare, finance) who need zero-knowledge encrypted file storage that even the vendor cannot read | True end-to-end (zero-knowledge) encryption on all stored files, meaning Sync.com cannot decrypt user content even under legal compulsion, unlike mainstream competitors that can technically access unencrypted files. | Reviewers report real reliability problems including slow performance and basic operations like folder creation failing at times, along with slow customer support response times where users describe having to perform their own recovery steps after minimal guidance; because encryption is end-to-end, a lost password also means permanently lost access to files with no vendor-side recovery. | Low | Free tier · paid from $4/mo |
| Proton Drive | privacy-focused individuals and small teams who want end-to-end encrypted cloud storage with a genuinely usable free tier and open-source, independently-audited clients | Files are end-to-end encrypted before upload — Proton itself cannot read them — and the client source code (GPL-3.0) is public on GitHub for independent review. | End-to-end encryption means there is no way for Proton to recover a lost password or restore access to encrypted files without a saved recovery kit; the free tier's 5 GB is modest, and getting the best per-dollar value requires bundling into the pricier $12.99/month Proton Unlimited plan rather than buying Drive storage alone. | Low | Free tier · paid from $4.99/mo |
Sync.com
Proton Drive1.Proton Drive — best Sync.com alternative for privacy-focused individuals and small teams who want end-to-end encrypted cloud storage with a genuinely usable free tier and open-source, independently-audited clients
Proton Drive is the best Sync.com alternative for privacy-focused users who want the same zero-knowledge encryption model as Sync.com, but with open-source, independently audited client code published on GitHub under GPL-3.0, transparency Sync.com's closed-source clients don't offer. Proton Drive's free tier includes 5GB of storage, matching Sync.com's own free tier exactly, and Drive Plus costs $4.99/month for 200GB, close to Sync.com's $4/month Personal 150GB plan. Proton Drive also includes encrypted Proton Docs and Proton Sheets for collaborative editing within the same encrypted storage, a capability Sync.com's file-sync-only model doesn't offer. Proton is based in Switzerland, subject to strict Swiss privacy law, a jurisdictional privacy pitch comparable to Sync.com's own Canadian basis. Sync.com is still the better choice for users who specifically want a longer operating track record with dedicated business and team plans: Proton Drive has no external ratings recorded on G2, Capterra, or Product Hunt to compare against Sync.com's 57 Capterra reviews, and its best per-dollar value requires bundling into the pricier $12.99/month Proton Unlimited plan rather than a Drive-only purchase.
Compared to Sync.com: open-source (GPL-3.0), independently audited client code vs Sync.com's closed-source clients, matching 5GB free tier, encrypted Proton Docs and Sheets for collaborative editing within the same storage
Wins:Client source code is open source (GPL-3.0) and independently audited, unlike Sync.com's closed-source clients · Free tier includes 5GB of storage, exactly matching Sync.com's own free tier · Includes encrypted Proton Docs and Proton Sheets for collaborative editing within the same encrypted storage, a capability Sync.com's file-sync-only model doesn't offer
Loses:No external ratings recorded on G2, Capterra, or Product Hunt to compare against Sync.com's 57 Capterra reviews · Best per-dollar value requires bundling into the pricier $12.99/month Proton Unlimited plan rather than a Drive-only purchase · No dedicated team/business plan pricing shown in its listing the way Sync.com's separate business pricing page offers
Pros
- Files are end-to-end encrypted client-side, so Proton cannot read stored content.
- Client source code is open source (GPL-3.0) and independently audited.
- 5 GB free tier is more generous than most end-to-end encrypted competitors.
- Based in Switzerland, subject to strict Swiss privacy law rather than US or EU data requests.
Cons
- Lost passwords can't be recovered by Proton for end-to-end encrypted content without a saved recovery kit.
- Free tier storage (5 GB) is modest compared to Google Drive's 15 GB free tier.
- Best value per dollar requires the pricier Proton Unlimited bundle rather than a Drive-only plan.
Pricing: Free tier · paid from $4.99/mo — $4.99/month Drive Plus (200GB) vs Sync.com's $4/month Personal 150GB (verified undefined NaN, NaN)