Comparison

Proton Mail vs CYCLENBATT

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

CYCLENBATT

Monitor your lithium battery's voltage, current, and capacity in real-time via Bluetooth. Supports a wide range of battery types for agricultural, RV, industrial, and electric vehicle applications.

Highlights
  • Bluetooth connectivity
  • Real-time voltage display
  • Real-time current display
  • Real-time capacity display
  • Wide device compatibility
Features
Read full description

The app can connect to the following devices via Bluetooth: 12V 24V 36V 48v lithium battery, agricultural lithium battery, RV solar battery, industrial vacuum cleaner sweeper battery, 48V50ah lithium iron phosphate battery, golf cart and electric car battery, low temperature lithium battery, power/energy storage lithium battery, 48V 51.2V 60V 72V 96V lithium battery After connecting, the corresponding voltage, current and capacity will be displayed

Screenshots

Proton Mail4 screens
CYCLENBATT4 screens

Verdict

The call

The clearest difference is review sentiment: Proton Mail at 47% against CYCLENBATT's 0%. Proton Mail also leads on rating (4.8 vs 2.5) and update cadence (every 10 days vs every 4 months). CYCLENBATT's advantage is in-app purchases (none vs 6) and iOS requirement (13.0 vs 17.2). On price, 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. CYCLENBATT asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Proton Mail holds the better App Store score, 4.8 against 2.5. That said, the two scores are not equally well evidenced: Proton Mail has 48K ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 47% of Proton Mail's written reviews are positive against 0% of CYCLENBATT's.

UpkeepUpdate frequency

Proton Mail ships an update every 10 days, CYCLENBATT every 4 months. The most recent releases landed on October 18, 2026 and October 11, 2026 respectively.

Scorecard8 real differences · 3 level
Proton Mail versus CYCLENBATT: the parameters behind the verdict, then further details
ParameterProton MailCYCLENBATT
PriceFreeFree
Rating4.8 (48K ratings) — better2.5 (4 ratings)
Positive reviews46.6% of reviews — better0.0% of reviews
Number of ratings48K — better4
Update frequencyEvery 10 days — betterEvery 4 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank#63 — better—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.213.0 — better
Further details — not scored
Size272 MB35 MB
Age rating4+4+
DeveloperProton AGNanchang Yepai Technology Co., Ltd.

Customer experience

Proton Mail

All ratings48,309 ratings
Positive94.4%
Neutral2.1%
Negative3.5%
Written reviews1,671 reviews
Positive46.6%
Neutral13.6%
Negative39.8%

CYCLENBATT

All ratings4 ratings
Positive25.0%
Neutral0.0%
Negative75.0%
Written reviews3 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

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

CYCLENBATT

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

CYCLENBATT

No in-app purchases

Questions

Is Proton Mail free?
Proton Mail is free to download, with in-app purchases available.
Is CYCLENBATT free?
CYCLENBATT is free to download, with no in-app purchases.
Which has better reviews, Proton Mail or CYCLENBATT?
Proton Mail is rated higher. Proton Mail averages 4.8 out of 5 from 48K ratings, while CYCLENBATT averages 2.5 from 4 ratings.
Do Proton Mail or CYCLENBATT have ads?
Neither Proton Mail nor CYCLENBATT shows ads.
Which is updated more often, Proton Mail or CYCLENBATT?
Proton Mail ships an update every 10 days, and CYCLENBATT every 4 months. Most recently, Proton Mail was updated on October 18, 2026 and CYCLENBATT on October 11, 2026.

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