Comparison

Proton Mail vs ObSync

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Proton Mail

This encrypted email service from Switzerland prioritizes user privacy with end-to-end encryption. It offers robust security features to protect your communications from phishing, spam, and tracking, allowing you to manage your inbox with ease.

Highlights
  • End-to-end encryption
  • Password-protected emails
  • Multiple account support
  • Inbox organization (folders, labels)
  • Dark mode
  • Phishing and spam protection
Read full description

Keep your conversations private. Proton Mail is encrypted email from Switzerland. Used by millions worldwide, our all-new email app protects your communications and has everything you need to easily manage your inbox. The Wall Street Journal says: “Proton Mail offers encrypted email, which makes it virtually impossible for anyone to read it except the sender and the recipient.” With the all-new Proton Mail app, you can: • Create a @proton.me or @protonmail.com email address • Send and receive encrypted emails and attachments with ease • Switch between multiple Proton Mail accounts • Easily manage your email with conversations • Keep your inbox tidy and clean with folders, labels and simple swipe-gestures • Receive new email notifications • Send Password-protected Emails to anyone • Keep important emails in focus with automatic, private categories • Enjoy your inbox in dark mode Why use Proton Mail? • Easy to use — Our all-new app has been redesigned to make it easier to read, organize, and write your emails. • Your inbox is yours — We don’t spy on your communications to show you targeted ads. Your inbox, your rules. • Rigorous encryption — Your entire inbox is secured, on all your devices. No one can read your emails but you. Proton is privacy, guaranteed by end-to-end and zero-access encryption. • Unmatched protection — We offer strong phishing, spam, and spying/tracking protection for all your communications. Industry Leading Security Features Messages are stored on Proton Mail servers using end-to-end encryption at all times and are transmitted securely between Proton servers and user devices. This largely eliminates the risk of message interception. Zero Access to Your Email Content Proton Mail's zero access architecture means that your data is encrypted in a way that makes it inaccessible to us. Data is encrypted on the client side using an encryption key that Proton does not have access to. This means we don't have the technical ability to decrypt your messages. Open-Source Cryptography Proton Mail's open-source software has been thoroughly vetted by security experts from around the world to ensure the highest levels of protection. Proton Mail only uses secure implementations of AES, RSA, along with OpenPGP, while all of the cryptographic libraries used are open source. By using open-source libraries, Proton Mail can guarantee that the encryption algorithms used do not have clandestinely built-in back doors. Proton Mail in the press: “Proton Mail is a Gmail-like email system which uses end-to-end encryption, making it impossible for outside parties to monitor.” Forbes “A new email service being developed by a group who met at MIT and CERN promises to bring secure, encrypted email to the masses and keep sensitive information away from prying eyes.” Huffington Post Follow Proton on social media for all the latest news and offers: Facebook: /proton Twitter: @protonprivacy Reddit: /protonmail Instagram: /protonprivacy Our open-source code base: https://github.com/ProtonMail EULA: http://www.apple.com/legal/itunes/appstore/dev/stdeula

About

ObSync

Read full description

ObSync syncs your git-hosted Obsidian vaults to your iPhone or iPad. One tap to pull the latest, or push your changes back. No terminal, no workarounds, no emulators. Built with SwiftUI and libgit2 for native git performance. Features: • One-tap sync — clone on first run, fetch and update on every sync after • Read-only or read-write — pull only, or auto-commit and push local changes • Multi-vault — sync as many repos as you want • Branch selection — pick which branch to track per vault • Shortcuts & Siri — sync vaults from the home screen or by voice • Conflict detection — warns when local and remote diverge, with a one-tap discard option • GitHub OAuth — secure login, token stored in iOS Keychain • Recent commits — see what changed, open commits directly on GitHub

Screenshots

Proton Mail4 screens
ObSync3 screens

Verdict

The call

The clearest difference is in-app purchases: ObSync at none against Proton Mail's 6. Proton Mail's advantage is chart position (#70 vs unranked). On price, update cadence, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Proton Mail sells 6 in-app purchases, starting at $5.99 per month. ObSync asks for nothing beyond the download.

UpkeepUpdate frequency

Proton Mail ships an update every 11 days, ObSync every 6 days. The most recent releases landed on September 25, 2026 and September 20, 2026 respectively.

Scorecard2 real differences · 9 level
Proton Mail versus ObSync: the parameters behind the verdict, then further details
ParameterProton MailObSync
PriceFreeFree
Rating4.8 (47K ratings) — better—
Positive reviews46.2% of reviews—
Number of ratings47K — better—
Update frequencyEvery 11 daysEvery 6 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
Best chart rank#70 — better—
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.217.0 — better
Further details — not scored
Size272 MB3 MB
Age rating4+4+
DeveloperProton AGKarlo Milicic

Bugs and requests

Proton Mail

Reported bugs

3 issues
  • Login issues and lost email data
  • Unreliable push notifications
  • Inconsistent user experience between app and web

Requested features

4 requests
  • Conversation threading and email previews
  • Customizable notification sounds
  • Offline email access
  • Improved syncing across devices

ObSync

Not enough reviews yet to summarise bugs or requests.

In-app purchases

6 purchases

Proton Mail

Subscriptions4
  • Mail Plus 1 month1 Month trial$5.991 Month
  • Unlimited 1 month$14.991 Month
  • Mail Plus 12 months$47.901 Year
Show 1 more
  • Unlimited 1 year$119.001 Year
One-time2
  • Mail Plus (1 year)$59.99
  • Proton Unlimited$149.99
None

ObSync

No in-app purchases

Questions

Is Proton Mail free?
Proton Mail is free to download, with in-app purchases available.
Is ObSync free?
ObSync is free to download, with no in-app purchases.
Do Proton Mail or ObSync have ads?
Neither Proton Mail nor ObSync shows ads.
Which is updated more often, Proton Mail or ObSync?
Proton Mail ships an update every 11 days, and ObSync every 6 days. Most recently, Proton Mail was updated on September 25, 2026 and ObSync on September 20, 2026.

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