Comparison

iBal Rotary vs Proton Mail

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

Head to head
About

iBal Rotary

This app helps helicopter pilots quickly calculate weight and balance for their aircraft. It supports numerous helicopter models and allows users to add custom aircraft configurations. The app provides graphical displays and can email mission manifests, aiding in compliance with aviation regulations.

Highlights
  • Supports numerous helicopter types
  • Add custom aircraft configurations
  • Graphical CG displays
  • Email mission manifests
  • Detects weight and CG problems
  • Predefined load lists
Features
Read full description

iBal Rotary is a dedicated Helicopter weight and balance app for iPhone, iPad, iPod and Mac. Designed from the ground up for professional and private helicopter pilots, it provides for quick and easy entry of loads and checks against type-specific weight, lateral and longitudinal CG limits, load station limits etc. Graphical displays, mission and manifest sent by email and much more. Online information, help and discussion at http://groups.google.com/group/ibal-help http://www.airspayce.com/airspayce/ibal Quick Reference Sheet http://www.airspayce.com/iBal/ReferenceSheet.pdf Features: Many types supported: See http://www.airspayce.com/airspayce/ibal/ibal-types-supported for detailed list of supported types and configurations. Robinson R22 Beta, BetaII, Alpha, HP, R44, R44 II, R66 Agusta A109AII, A109E, A119 and AW119 MK II Agusta Bell AB212 IFR Pax Agusta-Westland AW109SP, AW139 Bell 205A-1 and 205A-1 with STC SH5977NM, 204B, 206B3 Jet Ranger, 206L Long Ranger (L, L1, L3, and L4 models), 210, 222U, 230, 212, 407, 412, 427, 429, 430 Schweizer/Hughes 269C/300C, 333, 333M Hughes OH-6A Eurocopter AS350 B, BA, BA+, B1, B2, B3, D Squirrel, AS332, AS355 N, NP, F1 and F2 twin Squirrel AS365 N1, N2, N3 Dauphin, BK117 A-3, A-4, B, C-1, C+, EC120B Colibri, EC130 B4, EC135 P2+, EC130/H130 EC155 B,B1, EC225 LP Enstrom 280FX, 480B Boeing CH-47 Chinook Cabri G2 MD500D (369D), MD530F-Plus (369FF), MD600N, MD902 MBB105 LS A3 Sikorsky S-76A,A+,A++, S-76B, C, S-76C++, S-92A, UH-61A,L Blackhawk Add any number of your own aircraft, including preconfigured loads and photos of your own aircraft. Send completed CG Solutions (including manifest) and CG graphs to any email address (internet connection required) Configurable Name, BEW, longitudinal and lateral arms and photo for your own aircraft (from camera or photo roll where supported). Easy entry and adjustment of passengers, fuel, cargo and suspended loads. Displays CG for loaded and empty fuel, critical fuel loads with and without any suspended load. Detects and displays weight, longitudinal and lateral CG problems. Displays available load until limits will be exceeded. Displays weights, arms and CG solutions in graphical and tabular formats, with problem alerts. Support for optional Passenger names and Flight Details which appear on the CG solution spreadsheet and are transmitted when Send tapped. This supports new FAA rules requiring FAR Part 135 (Air Taxi) Operators to manifest every flight stage and for it to be transmitted back to base. Support for Predefined Loads: user definable list of commonly carried loads and their weights. Useful for EMS staff lists, oil rig personnel lists, common cargo items etc. List of predefined loads can be accessed from the load edit page to automatically enter the weight and description. The list can be customised to include any number of your own personnel names or freight descriptions plus the weight of each. Predefined loads can be added or removed from your list at any time, and will not be lost when you update iBal. Loads can be entered in your choice of suitable unit: kg, lbs, USGals, litres, stones (also fuel % in applicable types). Supports iPhone gestures: Drag passengers and cargo between stations Flick cargo and passengers off Zoom and scroll floorplans, graphs and load sheets Aircraft-specific Custom Load Stations, allowing you to add new or non-standard loading positions to your own aircraft. Displays helpful loading data, limits and hints. Optional Alert sounds and vibration for bad solutions for easy in-flight use. Configurable fuel SGs Supports Apple AirPrint, Retina, iOS 5 and later on iPhone, iPad, etc. Works with Aeronet http://www.aeronet.co.nz/ a world class maintenance, flight and duty tracking system. Allows operators to automatically update their Aeronet records with the flight details emailed by iBal. Reduces the time and cost of records compliance.

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

Screenshots

iBal Rotary4 screens
Proton Mail4 screens

Verdict

The call

The clearest difference is price: Proton Mail at Free against iBal Rotary's $17.99. Proton Mail also leads on rating (4.8 vs 4.4) and ratings volume (47K vs 23). iBal Rotary's advantage is review sentiment (83% vs 46%) and in-app purchases (none vs 6). On ads, chart position 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

Proton Mail is free to download; iBal Rotary costs $17.99 up front. Proton Mail sells 6 in-app purchases, starting at $5.99 per month. iBal Rotary asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Proton Mail holds the better App Store score, 4.8 against 4.4. That said, the two scores are not equally well evidenced: Proton Mail has 47K ratings behind it against 23, so its average is the more settled of the two. Written reviews complicate that: 83% of iBal Rotary's written reviews are positive against 46% of Proton Mail's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

iBal Rotary ships an update every 2 months, Proton Mail every 11 days. The most recent releases landed on September 25, 2026 and September 26, 2026 respectively.

Scorecard8 real differences · 3 level
iBal Rotary versus Proton Mail: the parameters behind the verdict, then further details
ParameteriBal RotaryProton Mail
Price$17.99Free — better
Rating4.4 (23 ratings)4.8 (47K ratings) — better
Positive reviews82.9% of reviews — better46.2% of reviews
Number of ratings2347K — better
Update frequencyEvery 2 monthsEvery 11 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
Best chart rank#125#69 — better
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.017.2 — better
Further details — not scored
Size29 MB272 MB
Age rating+44+
DeveloperAirSpayceProton AG

Customer experience

iBal Rotary

All ratings23 ratings
Positive87.0%
Neutral0.0%
Negative13.0%
Written reviews76 reviews
Positive82.9%
Neutral2.6%
Negative14.5%

Proton Mail

All ratings47,046 ratings
Positive94.4%
Neutral2.2%
Negative3.5%
Written reviews1,621 reviews
Positive46.2%
Neutral13.6%
Negative40.2%

User reviews

iBal Rotary

From 23 App Store ratings

What we love

  • 🚀 Fast and accurate calculations
  • 👍 User-friendly and simple interface
  • 🛠️ Excellent customer support
  • ✅ Reliable and functional
  • 💡 Versatile and complete

Room to improve

  • 💰 Repurchase required for new versions
  • 🔊 Annoying sounds
  • 👎 Poor user interface
  • 📉 Outdated data
  • 🤷‍♂️ Stations cannot be deleted

Proton Mail

From 47K App Store ratings

What we love

  • 🚀 Smooth performance
  • 🔒 Excellent security and privacy
  • 👍 Clean and intuitive interface
  • 💡 Expanding ecosystem of Proton services

Room to improve

  • 🐛 Occasional crashes and bugs
  • ⏱️ Slow email loading times
  • 📝 Lacking advanced email management features
  • 💰 Expensive paid plans

Bugs and requests

iBal Rotary

Reported bugs

4 issues
  • App crashes on iPhone 4 since latest update
  • Choose photo function does not work on iPad Mini Retina
  • Math is sometimes wrong
  • Rounding of aircraft values is annoying

Requested features

10 requests
  • Add B3E aircraft
  • Ability to modify aircraft data
  • Add BK-117 D2/D3 (H145) to aircraft list
  • Add Bell 505 to aircraft library
  • Input fuel burn to calculate flight duration estimate
Show 5 more
  • Adjustable minimum fuel
  • Add AS 350 B3 to list
  • Simplify PDF/printed page to one page
  • Remove sound features
  • Allow building own configuration with lateral c of g

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

In-app purchases

None

iBal Rotary

No 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

Questions

Is iBal Rotary free?
iBal Rotary costs $17.99, with no in-app purchases.
Is Proton Mail free?
Proton Mail is free to download, with in-app purchases available.
Which has better reviews, iBal Rotary or Proton Mail?
Proton Mail is rated higher. iBal Rotary averages 4.4 out of 5 from 23 ratings, while Proton Mail averages 4.8 from 47K ratings.
Do iBal Rotary or Proton Mail have ads?
Neither iBal Rotary nor Proton Mail shows ads.
Which is updated more often, iBal Rotary or Proton Mail?
iBal Rotary ships an update every 2 months, and Proton Mail every 11 days. Most recently, iBal Rotary was updated on September 25, 2026 and Proton Mail on September 26, 2026.
Which is more popular, iBal Rotary or Proton Mail?
iBal Rotary currently peaks at #125 in the App Store charts, and Proton Mail at #69. Chart position reflects recent download velocity rather than total install base.

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