# HDL 100 vs Stolo Systems

The clearest difference is update cadence: Stolo Systems at every 3 weeks against HDL 100's every 2 months. HDL 100's advantage is iOS requirement (8.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

HDL 100 ships an update every 2 months, Stolo Systems every 3 weeks. The most recent releases landed on October 13, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | HDL 100 | Stolo Systems |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (10 ratings)](https://appshunter.io/ios/app/stolo-systems/id6788348702/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 154 MB | 265 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hultafors Group AB](https://appshunter.io/developer/1162647287) | [Stolo Systems Inc.](https://appshunter.io/developer/6788348704) |

## What reviewers say

### HDL 100

[App page](https://appshunter.io/ios/app/hdl-100/id1465878451)

**Features:** macOS Compatibility

**In-app purchases:** none


### Stolo Systems

[App page](https://appshunter.io/ios/app/stolo-systems/id6788348702)

This app provides encrypted, off-grid messaging that functions without internet connectivity. It creates a peer-to-peer mesh network using Wi-Fi, cellular, or LoRa radio, enabling secure communication of messages, photos, voice notes, and GPS locations even when cell towers or servers are unavailable.

**Highlights:** Off-grid encrypted messaging, Peer-to-peer mesh network, Works without internet, End-to-end encryption, Offline world map, Emergency SOS beacon

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

**In-app purchases:** none


## Frequently asked questions

### Is HDL 100 free?

HDL 100 is free to download, with no in-app purchases.

### Is Stolo Systems free?

Stolo Systems is free to download, with no in-app purchases.

### Do HDL 100 or Stolo Systems have ads?

Neither HDL 100 nor Stolo Systems shows ads.

### Which is updated more often, HDL 100 or Stolo Systems?

HDL 100 ships an update every 2 months, and Stolo Systems every 3 weeks. Most recently, HDL 100 was updated on October 13, 2026 and Stolo Systems on October 5, 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.*