Comparison

Zero vs AltaMail

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

Head to head
About

Zero

This email client is designed for legal professionals to streamline their workflow and increase billable hours. It offers features like predictive filing, inbox sorting, recipient verification, and automatic time tracking for client communications, all while adhering to strict security standards.

Highlights
  • Predictive message filing
  • Inbox sorting by importance/sender
  • Wrong recipient warnings
  • Automatic time tracking
  • On-device AI processing
  • Strict security standards
Features
Read full description

ZERØ’s email client has been engineered to help lawyers work less and bill more. With ZERØ, lawyers can: · Predictively file messages to their document management system or to their corresponding email folders. · Sort their inboxes by parameters such as importance and sender. · Receive a warning in real-time if they are about to send a message to a potential wrong recipient. · Automatically and contemporaneously capture the time spent interacting with client messages from their mobile devices. And as powerful as ZERØ is, the application takes into account the strictest security standards. Our proprietary AI processes data directly on the device—meaning that no user data is ever sent outside of the device for processing. ZERØ also always remains entirely within your law firm’s security perimeter. Using ZERØ, lawyers can be more productive and generate more revenue.

About

AltaMail

Streamline your inbox with advanced spam filtering and customizable rules. Quickly manage emails using swipe actions, organize by account, and back up messages offline. This app offers extensive customization for a desktop-like email experience on mobile.

Highlights
  • Smart spam detection
  • Customizable email rules and filters
  • Quick swipe actions for inbox management
  • Offline email backup
  • Work/home email separation
  • Mailshots and templates
  • Watch app integration
Features
Read full description

Eliminate Spam with smart Spam detection. Use rules and quick swipe actions to rapidly clear your inbox. Separate work and home emails for focus. Backup emails offline as files. AltaMail is easy to use but has way more features than any other mobile app! Build rules & filters, create full searches, mixed inbox view layouts, mail shots and much more. Customize menus, views, actions, swipes, email font, color, layout, shortcuts, filters, rules, smart folders, flags and notifications. Use the Watch app to view, reply and print emails on the go. iOS Shortcuts integration, Dark Mode and Widgets Some features require the AltaMail Pro upgrade The AltaMail team does not compromise on functionality. AltaMail eliminates the need for a desktop email application. - Press Reviews Incredible iPhone Apps for Dummies "The more e-mail you send & receive on your iPhone/iPad, the more you'll appreciate AltaMail" AppShouter "this app expands the possibilities for mail" iPhone Apps Finder "a very solid business app - 9/10" ArticleClick "bottom line is that this app expands the possibilities for mail on your iPhone or iPad" - Inbox Zero! Swipe emails for quick actions. eg. move to folder, mark as spam, mark as read, delete, set flags, reply with template, quick reply, snooze/set reminders and much more! Bulk select & delete email across multiple accounts Show email threads with a single tap, bulk move the entire thread Create your own swipe actions and rules to make managing your email even faster Move emails to different accounts Create your own email views, filtered by account, type, subject and much more. eg. news, lists, friends, purchases Sort emails by unread, importance, subject, sender & more. Set email flags/categories/gmail labels and view emails by flag Create, rename and delete email folders. Choose to automatically remove older emails - Email rules The most sophisticated email rules engine on the app store! Huge range of choices for filters and actions. Set up rules to auto reply, auto delete, auto file/archive, set flags & lots more - Eradicate spam A quick swipe will mark and email as spam, move it to the spam folder, block the sender email address, domain or IP address and unsubscribe - in one action! Smart Spam detector and also DMARC, DKIM, SPF Create spam actions and rules - Work-life balance Group and view your email accounts in different categories, eg. work, personal etc. Turn on "locations" to automatically view your work emails at work, and your home emails at home Schedule emails to send at a later time Schedule checking for new emails - Calendar/Reminders Manage meeting requests Email a summary of available times Print your calendar/reminders - Mailshots & Templates Quickly create mail merge/mailshot templates & send to contacts Use templates for auto replies Many contact merge fields - Security Secure email server communication and 2 factor authentication Emails are encrypted on your device App password lock S/MIME support - Notifications Quick new email notifications with actions Read receipts for sent email Custom email sounds Schedules for notifications & sounds Filter notifications & sounds Automatically back up emails as files to cloud servers or Mac/PC Contact email history records Edit contacts & groups Save emails as files Zip/unzip files Save/attach files with cloud servers Sync settings between devices The optional AltaMail Pro upgrade provides multiple accounts, Spam management, Work-Life Balance, Email Rules, Mailshots/Templates, Email file backup and Read Receipts. The upgrade has a free 30 day trial then a 99c/month or 1 year subscription ($9.99 varies by region). Subscriptions are charged to your iTunes account and auto-renew unless turned off prior to 24-hours before the end, otherwise your account is charged. Subscriptions are managed & auto-renewal is turned off in your App Store Account Settings. The free trial stops when a subscription starts. Privacy/Terms https://esz.nz/pv

Screenshots

Zero4 screens
AltaMail4 screens

Verdict

The call

The clearest difference is review sentiment: AltaMail at 90% against Zero's 25%. AltaMail also leads on ratings volume (373 vs 3) and iOS requirement (15.0 vs 17.0). Zero's advantage is in-app purchases (none vs 3) and rating (5.0 vs 4.6). 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. AltaMail sells 3 in-app purchases, starting at $0.99 per month. Zero asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Zero holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: AltaMail has 373 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 25% of Zero's written reviews are positive against 90% of AltaMail's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Zero ships an update monthly, AltaMail every 3 weeks. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.

Scorecard6 real differences · 4 level
Zero versus AltaMail: the parameters behind the verdict, then further details
ParameterZeroAltaMail
PriceFreeFree
Rating5.0 (3 ratings) — better4.6 (373 ratings)
Positive reviews25.0% of reviews90.5% of reviews — better
Number of ratings3373 — better
Update frequencyMonthlyEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS17.015.0 — better
Further details — not scored
Size207 MB56 MB
Age rating17+17+
DeveloperAderant Holdings Inc.EuroSmartz Ltd

Customer experience

Zero

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive25.0%
Neutral0.0%
Negative75.0%

AltaMail

All ratings372 ratings
Positive91.7%
Neutral1.9%
Negative6.5%
Written reviews420 reviews
Positive90.5%
Neutral2.6%
Negative6.9%

Bugs and requests

Zero

Not enough reviews yet to summarise bugs or requests.

AltaMail

Reported bugs

5 issues
  • Login screen freezes
  • Incompatible with older devices
  • Email notifications not working properly
  • Formatting issues with email text
  • Syncing issues between devices

Requested features

3 requests
  • Dark mode option
  • Advanced analytics dashboard
  • Bionic reading font option

In-app purchases

None

Zero

No in-app purchases

3 purchases

AltaMail

Subscriptions2
  • 1 month. autorenews$0.991 Month
  • 1 year. autorenews$9.991 Year
One-time1
  • Lifetime AltaMail Pro$49.99

Questions

Is Zero free?
Zero is free to download, with no in-app purchases.
Is AltaMail free?
AltaMail is free to download, with in-app purchases available.
Which has better reviews, Zero or AltaMail?
Zero is rated higher. Zero averages 5.0 out of 5 from 3 ratings, while AltaMail averages 4.6 from 373 ratings.
Do Zero or AltaMail have ads?
Neither Zero nor AltaMail shows ads.
Which is updated more often, Zero or AltaMail?
Zero ships an update monthly, and AltaMail every 3 weeks. Most recently, Zero was updated on October 24, 2026 and AltaMail on October 29, 2026.

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