# Solid Mobile Key vs CNVRT

The clearest difference is review sentiment: CNVRT at 50% against Solid Mobile Key's 0%. CNVRT also leads on rating (4.5 vs 1.0) and ratings volume (19 vs 1). Solid Mobile Key's advantage is price (Free vs $4.99) and iOS requirement (9.0 vs 15.0). On update cadence, ads and in-app purchases there is nothing between them.

Solid Mobile Key is free to download; CNVRT costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

CNVRT holds the better App Store score, 4.5 against 1.0. That said, the two scores are not equally well evidenced: CNVRT has 19 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of Solid Mobile Key's written reviews are positive against 50% of CNVRT's.

Solid Mobile Key ships an update every 11 days, CNVRT every 2 weeks. The most recent releases landed on June 5, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Solid Mobile Key | CNVRT |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/solid-mobile-key/id1315440413/reviews) | **[4.5 (19 ratings)](https://appshunter.io/ios/app/cnvrt-si-unit-conversion-tool/id1607762263/reviews)** |
| Number of ratings | 1 | **19** |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 2 weeks |
| Monetization | **Free** | Paid |
| Size | 11 MB | 1 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [SOLID-55](https://appshunter.io/developer/1635352606) | [Pascal Andraos](https://appshunter.io/developer/1328885685) |

## What reviewers say

### Solid Mobile Key

[App page](https://appshunter.io/ios/app/solid-mobile-key/id1315440413)

Manage your home's iPS series doors remotely using your mobile phone. This system allows you to check if your door is locked, unlock it from a distance, grant or deny access to others, and receive security alerts.

**Highlights:** Remote door unlocking via phone call, Check door lock status, Grant and revoke access for users, Receive entry/exit notifications, Security breach alerts

**In-app purchases:** none


### CNVRT

[App page](https://appshunter.io/ios/app/cnvrt-si-unit-conversion-tool/id1607762263)

Instantly convert over 200 units across 20 measurement categories, from weight and length to temperature and data storage. This tool simplifies metric and Imperial conversions for STEM professionals and everyday users alike.

**Highlights:** Over 200 units supported, 20 measurement categories, Instant conversions, Metric and Imperial units, Optimized for Apple devices, STEM and everyday use

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Solid Mobile Key free?

Solid Mobile Key is free to download, with no in-app purchases.

### Is CNVRT free?

CNVRT costs $4.99, with no in-app purchases.

### Which has better reviews, Solid Mobile Key or CNVRT?

CNVRT is rated higher. Solid Mobile Key averages 1.0 out of 5 from 1 ratings, while CNVRT averages 4.5 from 19 ratings.

### Do Solid Mobile Key or CNVRT have ads?

Neither Solid Mobile Key nor CNVRT shows ads.

### Which is updated more often, Solid Mobile Key or CNVRT?

Solid Mobile Key ships an update every 11 days, and CNVRT every 2 weeks. Most recently, Solid Mobile Key was updated on June 5, 2026 and CNVRT on September 18, 2026.

---

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