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81
BU Score
Excellent

Proton Mail - Sichere E-Mails

4.8 ✍️ Editor
✍️ BU Analytics Review

Proton Mail - Sichere E-Mails is an iOS app from Proton AG in the Productivity category, currently rated 4.8★ across 42,805 ratings. Initial signal reads as mixed reviews — supporters praise core features while critics cite stability/value gaps.

Our BU Score puts it at 81Excellent (strong product-market fit). For a Productivity app, that means strong product-market fit.

Track changes month-over-month in the Performance section below — live snapshot history and revenue forecast included.

creator

📊 Performance Tracking LIVE

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Rating
Reviews
Forecast Revenue / mo
Snapshots tracked
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Range:

💰 Forecast Revenue / mo

MODEL
Revenue forecast computed from BU's 234 trigger model on each snapshot. Calibrated against ground-truth from 58 verified-revenue apps.
🔬Forecast Breakdown — Why This Estimate?Top 13 of 13 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
Mid install base (42,805 ratings)METRIC
+$5,500
Paid app ($0.00)METRIC
+$2,800
Excellent rating (4.8★)METRIC
+$2,200
worth every pennyREVIEW
+$2,000
bugsREVIEW
−$1,800
5 starREVIEW
+$1,800
great valueREVIEW
+$1,600
cancelledREVIEW
−$1,500
excellent appREVIEW
+$1,500
Mature app (10y old)METRIC
+$1,500
Multilingual (29 languages)METRIC
+$1,500
highly recommendREVIEW
+$1,400
slowREVIEW
−$1,200
METRIC = structural app data · REVIEW = mined from user reviews · ✓ VERIFIED = Stripe-verified anchor (TrustMRR)

📈 Reviews Growth

LIVE
Cumulative review count from first BU snapshot. Each point = a tracked update.
💚Sentiment Over Time↑ green = positive · ↓ red = negative
Jun 25
Jul 25
Aug 25
Sep 25
Oct 25
Nov 25
Dec 25
Jan 26
Feb 26
Mar 26
Apr 26
May 26

⭐ Rating Trend

LIVE
Average rating evolution. Updates with each new review batch.

🗓️ Snapshot Timeline

HISTORY
Each bar shows a tracked update and the metric delta from the previous snapshot.
App Specs
🔐 Own this app? Claim & verify MRR →
💾 245 MB🔞 4+📱 iOS 17.2+🔖 v7.9.3🔄 updated 5d ago🌐 BE, CA, CS, DA, NL +24📂 Productivity💰 Paid🚀 Launched 2016 (10y old)

📝 About this app

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
• Enjoy your inbox in dark mode

Why use Proton Mail?
• Proton Mail is free — We believe everyone deserves privacy. Upgrade to a paid plan to get more done and support our mission.
• 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

🆕 What's New · v7.9.3

7.9.3
- Fixed an issue where some messages were not visible in the message list

7.9.2
- Fixed an issue where users who were signed out could not sign back in due to a "User already signed in" error
- Fixed an issue where the calendar widget would fail to load for invites with non-standard timezone formats

7.9.1
- Fixed an issue causing a "Something went wrong" error when opening PDF attachments

7.9.0
Features:
- Liquid Glass UI update
- Contact group badge shown in contacts list

Fixes:
- Fixed an error when viewing app settings
- Fixed an issue faced when signing-in
- Fixed an issue with signing-ing with 2FA
- Fixed an issue related to syncing your messages
- Update error messages related to storage quote when sending a new message
- Fixed an issue related to copy-pasting multiple inline images in the composer
- Fixed an issue where tapping the unread filter multiple times could is to not have effect
- Fixed an issue where accounts with sub-users couldn't disable the mobile signature
- Fixed an issue where some specific types of emails would fail to load
- Fixed an issue where contacts with multiple emails would all be added to a contact group view
- Fixed an issue causing the message list to sometimes not load correctly
- Fixed a rare case that would allow you to tap send multiple times showing an error message
- Improved blocking of trackers that could be used in emails

Profile & Insights

Everything we know — and don't — about this app and its company.

Identification

App name
Proton Mail - Sichere E-Mails
Developer
Proton AG
Bundle ID
ch.protonmail.protonmail
App Store URL
Open in App Store
Category
Productivity
Content rating
4+
Languages
BE, CA, CS, DA, NL, EN, FI, FR, KA, DE, EL, HU, ID, IT, JA, KO, NB, PL, PT, RO, RU, ZH, SK, SL, ES, SV, ZH, TR, UK

Company

Website
Not found
Tagline
A better internet starts with privacy and freedom
Description
Over 100 million people use Proton to stay private and secure online. Get a free Proton account and take back your privacy.
Founded
Not found
HQ / Address
Not found
Employees
Not found
Logo
OG image

Revenue

Verified revenue / mo
Not found
AI revenue estimate / mo
Not found
AI annual estimate
Not found
ML model estimate / mo
$22.6K/mo
Top-grossing rank
🇩🇪#60 /100   🇫🇷#70 /100   🇨🇦#72 /100   🇺🇸#79 /100
All-time revenue
Not found
Pricing
Not found

Founder

Name
Not found
X / Twitter
https://x.com/intent/user?screen_name=ProtonPrivacy
LinkedIn
https://www.linkedin.com/company/protonprivacy/
GitHub
Not found
X followers
Not found
Public statements
Not found

Funding

Total raised
Not found
Last round
Not found
Investors
Not found
Crunchbase
Not found
AngelList
Not found

Press & Links

Articles found
Not found
Listed on
Not found
Blog
https://proton.me/blog
Press / News
Not found

Contacts & Socials

Socials
discord · facebook · instagram · linkedin · tiktok · twitter · youtube
Email
Not found
Phone
Not found
Contact page
https://proton.me/support
About page
https://proton.me/about
Recent App Store Reviews49 latest · avg 3.39★ · 44.9% 5★ · 26.5% 1★
5★
22 (45%)
4★
4 (8%)
3★
7 (14%)
2★
3 (6%)
1★
13 (27%)
+151 ratings/week
Praise: great ×9 love ×9 recommend ×3 best ×3 awesome ×2Complaints: hate ×4 worst ×3 bug ×2 broken ×2 refund ×1
Top positive
★★★★★ Speed of light
As the owner of 2MJ Logistics LLC, I’ve found ProtonMail to be an exceptional email service for business communications. Its end-to-end encryption and strong privacy protections give me complete confidence that sensitive client and operatio…
★★★★★ My New Mailbox
I hope that Proton Mail sticks around and doesn’t go off the market.…
Top negative
★☆☆☆☆ Cannot get app to recognize password
I’m so frustrated. Moving on.…
★☆☆☆☆ Missing block sender feature
The block sender feature requires you to open phishing emails. “What’s new” Search does not work, matching text in body are not in search results They just made 1/3 of the page blank space. Need to add block sender to the checkbox menu…
📈Ratings growth42,857 ratings+61% lifetimeShow 3-year history estimate ▾May 2023Feb 2026May 2026
Tracked (33 weeks) Pre-tracking estimate (35 weeks) · model-based, ±5% noise · anchored to release date and current value
🗺️Geographic DistributionTop 10Top 30Top 60
DE#60FR#70CA#72US#79
🌍Top Countries — Grossing Rank4 countries
🇩🇪DE
#60 /100
🇫🇷FR
#70 /100
🇨🇦CA
#72 /100
🇺🇸US
#79 /100
📊Category Rank Trajectory#60 now · best #54 · worst #100
Lower line = better rank · Estimate from ratings growth model · Lower position on chart = worse rank · Higher = top of chart
Profile is built from iTunes Lookup + developer site scrape + ML revenue model. Empty fields show "Not found" — additional sources (Crunchbase, X, IndieHackers, Acquire.com) coming.
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