# Quantum Mobility vs Sumn

The clearest difference is rating: Quantum Mobility at 4.9 against Sumn's 4.3. Quantum Mobility also leads on update cadence (every 9 days vs every 3 weeks) and ratings volume (52 vs 12). On price, review sentiment, ads and in-app purchases there is nothing between them.

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

Quantum Mobility holds the better App Store score, 4.9 against 4.3. Both are backed by a comparable volume of ratings — 52 and 12 respectively. Written reviews complicate that: 92% of Quantum Mobility's written reviews are positive against 100% of Sumn's, so the app with the better star average is not the one people write more warmly about.

Quantum Mobility ships an update every 9 days, Sumn every 3 weeks. The most recent releases landed on October 6, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Quantum Mobility | Sumn |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (52 ratings)](https://appshunter.io/ios/app/quantum-mobility/id1599568793/reviews)** | [4.3 (12 ratings)](https://appshunter.io/ios/app/sumn/id1621748104/reviews) |
| Number of ratings | **52** | 12 |
| Positive reviews | 92.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 3 weeks |
| Monetization | Free | Free |
| Size | 87 MB | 72 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Quantum Mobility, LLC](https://appshunter.io/developer/1599568795) | [SUMN, Inc.](https://appshunter.io/developer/1649242120) |

## What reviewers say

### Quantum Mobility

[App page](https://appshunter.io/ios/app/quantum-mobility/id1599568793)

Reserve, unlock, and drive vehicles directly from your property using your phone. Book by the hour or day, find your car at a dedicated parking space, and return it when your trip is complete. Insurance is included with 24/7 availability.

**Highlights:** Reserve vehicles via phone, Unlock and drive with your phone, Hourly or daily bookings, Dedicated onsite parking, Insurance included, 24/7 availability

**Features:** Apple Wallet, Vision Pro support

**In-app purchases:** none


### Sumn

[App page](https://appshunter.io/ios/app/sumn/id1621748104)

This electric car-sharing app connects you with vehicles in your community for on-demand use. Easily book, drive, and control your reserved EV, making car-free living convenient and affordable. Enjoy free charging and included insurance for a seamless experience.

**Highlights:** On-demand EV booking, Digital car controls, Free charging, Included insurance, Trip history, Vehicle issue reporting

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Quantum Mobility free?

Quantum Mobility is free to download, with no in-app purchases.

### Is Sumn free?

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

### Which has better reviews, Quantum Mobility or Sumn?

Quantum Mobility is rated higher. Quantum Mobility averages 4.9 out of 5 from 52 ratings, while Sumn averages 4.3 from 12 ratings.

### Do Quantum Mobility or Sumn have ads?

Neither Quantum Mobility nor Sumn shows ads.

### Which is updated more often, Quantum Mobility or Sumn?

Quantum Mobility ships an update every 9 days, and Sumn every 3 weeks. Most recently, Quantum Mobility was updated on October 6, 2026 and Sumn on October 10, 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.*