# SphereMail Inc vs Sontara

The clearest difference is review sentiment: Sontara at 100% against SphereMail Inc's 0%. Sontara also leads on rating (5.0 vs 2.6). SphereMail Inc's advantage is in-app purchases (none vs 5) and iOS requirement (13.0 vs 15.1). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Sontara sells 5 in-app purchases, starting at $29.00 per month. SphereMail Inc asks for nothing beyond the download.

Sontara holds the better App Store score, 5.0 against 2.6. Both are backed by a comparable volume of ratings — 5 and 5 respectively. Written reviews point the same way: 0% of SphereMail Inc's written reviews are positive against 100% of Sontara's.

SphereMail Inc ships an update every 6 weeks, Sontara monthly. The most recent releases landed on October 24, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | SphereMail Inc | Sontara |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.6 (5 ratings)](https://appshunter.io/ios/app/spheremail-inc/id1355386834/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/sontara/id6770757463/reviews)** |
| Number of ratings | 5 | 5 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Monthly** |
| Monetization | **Free** | Subscription |
| Size | 40 MB | 62 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [SphereMail, Inc.](https://appshunter.io/developer/1355386833) | [Human Frontier Labs Inc.](https://appshunter.io/developer/1896762787) |

## What reviewers say

### SphereMail Inc

[App page](https://appshunter.io/ios/app/spheremail-inc/id1355386834)

Manage your paper mail securely online from any location. This platform allows employees and members to access and handle their physical correspondence remotely.

**Highlights:** Secure online platform, Manage paper mail, Remote access, Employee/member sign-in

**Features:** macOS Compatibility

**In-app purchases:** none


### Sontara

[App page](https://appshunter.io/ios/app/sontara/id6770757463)

This AI agent operates in the background to manage your inbox, calendar, and content strategy. It can research complex topics and integrates with your existing tools. Enjoy hands-free interaction with voice mode for ultimate convenience.

**Highlights:** Automated inbox management, Intelligent calendar scheduling, Content strategy building, In-depth research capabilities, Voice-activated hands-free mode, Integration with popular tools

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pioneer (Monthly) | $29.00 | per month |
| Voyager (Monthly) | $79.00 | per month |
| Pioneer (Annual) | $290.00 | per year |
| Architect (Monthly) | $349.99 | per month |
| Voyager (Annual) | $790.00 | per year |


## Frequently asked questions

### Is SphereMail Inc free?

SphereMail Inc is free to download, with no in-app purchases.

### Is Sontara free?

Sontara is free to download, with in-app purchases available.

### Which has better reviews, SphereMail Inc or Sontara?

Sontara is rated higher. SphereMail Inc averages 2.6 out of 5 from 5 ratings, while Sontara averages 5.0 from 5 ratings.

### Do SphereMail Inc or Sontara have ads?

Neither SphereMail Inc nor Sontara shows ads.

### Which is updated more often, SphereMail Inc or Sontara?

SphereMail Inc ships an update every 6 weeks, and Sontara monthly. Most recently, SphereMail Inc was updated on October 24, 2026 and Sontara on October 18, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*