# ZIG SIM vs Note To Self Mail

The clearest difference is in-app purchases: ZIG SIM at none against Note To Self Mail's 3. ZIG SIM also leads on update cadence (every 9 days vs every 6 weeks) and rating (5.0 vs 4.8). Note To Self Mail's advantage is ratings volume (374 vs 8). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. Note To Self Mail sells 3 in-app purchases, starting at $4.99 per year. ZIG SIM asks for nothing beyond the download.

ZIG SIM holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Note To Self Mail has 374 ratings behind it against 8, so its average is the more settled of the two. Written reviews complicate that: 88% of ZIG SIM's written reviews are positive against 90% of Note To Self Mail's, so the app with the better star average is not the one people write more warmly about.

ZIG SIM ships an update every 9 days, Note To Self Mail every 6 weeks. The most recent releases landed on October 10, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | ZIG SIM | Note To Self Mail |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (8 ratings)](https://appshunter.io/ios/app/zig-sim/id1112909974/reviews)** | [4.8 (374 ratings)](https://appshunter.io/ios/app/note-to-self-mail/id1135553707/reviews) |
| Number of ratings | 8 | **374** |
| Positive reviews | 87.5% of reviews | **90.2% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 6 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 4 MB | 85 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [1-10, INC.](https://appshunter.io/developer/1447864635) | [Mathias Lipowski](https://appshunter.io/developer/668302586) |

## What reviewers say

### ZIG SIM

[App page](https://appshunter.io/ios/app/zig-sim/id1112909974)

This app allows physical prototyping by sending smartphone sensor data to other devices via UDP socket communication. It enables verification of wearable devices and IoT without electronic kits. Supports various sensors and communication protocols.

**Highlights:** Smartphone sensor data transmission, UDP socket communication, Wearable device verification, IoT prototyping, Supports OSC and JSON messaging, Adjustable communication rates (1-60 FPS)

**Features:** macOS Compatibility

**In-app purchases:** none


### Note To Self Mail

[App page](https://appshunter.io/ios/app/note-to-self-mail/id1135553707)

Quickly capture your thoughts and send them directly to your inbox. This app integrates with popular to-do list applications, streamlining your workflow by sending notes via email. It offers basic note-taking with advanced features available in the pro version.

**Highlights:** Send notes directly to inbox, Integrates with Trello, Evernote, etc., Attach photos (pro), Create sketches (pro), Attach audio notes (pro), Scan documents (pro)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy me a coffee | $4.99 | per year |
| Pro Version | $4.99 | one-time |
| Buy me a coffee | $4.99 | one-time |

**What reviewers like**

- 🚀 Extremely fast and quick to use
- 👍 Simple and intuitive interface
- ⚙️ Highly customizable settings and options
- 🔒 Secure SMTP-based email delivery
- 📧 Seamless email integration with multiple accounts

**What reviewers complain about**

- 🐛 Google OAuth authentication issues
- 🔐 Requires SMTP server configuration (technical barrier)
- ⚠️ Occasional reliability issues after extended use
- 📱 Limited Apple Watch support
- 🌐 Browser sharing functionality sometimes fails

**Reported bugs**

- Google OAuth doesn't work properly
- Messages stuck in outbox with Google authentication
- App stops working after several weeks of use
- Safari share extension crashes or fails silently
- Browser sharing shows grey rectangle and fails

**Requested features**

- Scheduled/delayed send functionality
- Apple Watch native app
- Document scanning with PDF export
- YouTube title preservation in sharing
- iOS 26 UI updates


## Frequently asked questions

### Is ZIG SIM free?

ZIG SIM is free to download, with no in-app purchases.

### Is Note To Self Mail free?

Note To Self Mail is free to download, with in-app purchases available.

### Which has better reviews, ZIG SIM or Note To Self Mail?

ZIG SIM is rated higher. ZIG SIM averages 5.0 out of 5 from 8 ratings, while Note To Self Mail averages 4.8 from 374 ratings.

### Do ZIG SIM or Note To Self Mail have ads?

Neither ZIG SIM nor Note To Self Mail shows ads.

### Which is updated more often, ZIG SIM or Note To Self Mail?

ZIG SIM ships an update every 9 days, and Note To Self Mail every 6 weeks. Most recently, ZIG SIM was updated on October 10, 2026 and Note To Self Mail on October 11, 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.*