# Sierra sand piper vs Two factor authenticator

The clearest difference is in-app purchases: Sierra sand piper at none against Two factor authenticator's 3. Sierra sand piper also leads on ads (none vs shown) and iOS requirement (7.0 vs 15.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Two factor authenticator sells 3 in-app purchases, starting at $1.99 per 7 days. Sierra sand piper asks for nothing beyond the download.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on September 19, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Sierra sand piper | Two factor authenticator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (5 ratings)](https://appshunter.io/ios/app/sierra-sand-piper/id1427106099/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | Monthly |
| Monetization | Free | — |
| Size | 11 MB | 45 MB |
| Requires iOS | **7.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Patrick Industries, INC.](https://appshunter.io/developer/906011650) | [nguyen thanh](https://appshunter.io/developer/1481436893) |

## What reviewers say

### Sierra sand piper

[App page](https://appshunter.io/ios/app/sierra-sand-piper/id1427106099)

Control various functions of your TP35 vehicle device remotely. Manage lights, doors, monitor water temperature, and check battery percentage. Connect via Bluetooth for seamless operation and notifications.

**Highlights:** Light switch control, Door slide control, Water temperature display, Battery percentage display, Bluetooth connectivity, Notifications from device

**Features:** macOS Compatibility

**In-app purchases:** none


### Two factor authenticator

[App page](https://appshunter.io/ios/app/two-factor-authenticator/id6742745017)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Week Premium | $1.99 | per 7 days |
| One Month Premium | $4.99 | per month |
| 1 Year Premium | $19.99 | per year |


## Frequently asked questions

### Is Sierra sand piper free?

Sierra sand piper is free to download, with no in-app purchases.

### Is Two factor authenticator free?

Two factor authenticator is free to download, with in-app purchases available.

### Do Sierra sand piper or Two factor authenticator have ads?

Two factor authenticator shows ads; Sierra sand piper does not.

### Which is updated more often, Sierra sand piper or Two factor authenticator?

Sierra sand piper ships an update monthly, and Two factor authenticator monthly. Most recently, Sierra sand piper was updated on September 19, 2026 and Two factor authenticator on September 23, 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.*