# SPM 4D Series vs MARVLS

The clearest difference is update cadence: SPM 4D Series at fortnightly against MARVLS's every 4 months. SPM 4D Series also leads on device support (3 vs 1) and iOS requirement (9.0 vs 18.0). On price, 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.

SPM 4D Series ships an update fortnightly, MARVLS every 4 months. The most recent releases landed on October 26, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | SPM 4D Series | MARVLS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 4 months |
| Size | 348 MB | 242 MB |
| Requires iOS | **9.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 9+ |
| Developer | [Virtuocity Systems Sdn Bhd](https://appshunter.io/developer/1105959461) | [Michele McColgan](https://appshunter.io/developer/1532617986) |

## What reviewers say

### SPM 4D Series

[App page](https://appshunter.io/ios/app/spm-4d-series-physics/id1105961397)

**Features:** macOS Compatibility

**In-app purchases:** none


### MARVLS

[App page](https://appshunter.io/ios/app/marvls-physics-i-mechanics/id6475370470)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SPM 4D Series free?

SPM 4D Series is free to download, with no in-app purchases.

### Is MARVLS free?

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

### Do SPM 4D Series or MARVLS have ads?

Neither SPM 4D Series nor MARVLS shows ads.

### Which is updated more often, SPM 4D Series or MARVLS?

SPM 4D Series ships an update fortnightly, and MARVLS every 4 months. Most recently, SPM 4D Series was updated on October 26, 2026 and MARVLS on November 4, 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.*