# OneCryption vs Function Fitter

The clearest difference is in-app purchases: Function Fitter at none against OneCryption's 5. Function Fitter also leads on update cadence (monthly vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. OneCryption sells 5 in-app purchases, starting at $49.99 per month. Function Fitter asks for nothing beyond the download.

OneCryption ships an update every 3 months, Function Fitter monthly. The most recent releases landed on September 29, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | OneCryption | Function Fitter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/onecryption/id1399893476/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Freemium | — |
| Size | 11 MB | 4 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Christian Hell](https://appshunter.io/developer/329510560) | [29Apps LLC](https://appshunter.io/developer/1817021563) |

## What reviewers say

### OneCryption

[App page](https://appshunter.io/ios/app/onecryption/id1399893476)

This app offers true offline encryption for messages, photos, videos, and files. It emphasizes absolute secrecy through direct key exchange and no server reliance, ensuring quantum-proof security.

**Highlights:** Offline encryption for messages and files, Direct key exchange, No server reliance, Quantum-proof security, File and media encryption, Simple encryption/decryption

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium features monthly | $49.99 | per month |
| Premium features yearly | $500.00 | per year |
| Key of size 100MB | $0.99 | one-time |
| Key of size 500MB | $0.99 | one-time |
| Premium Lifetime | $399.99 | one-time |


### Function Fitter

[App page](https://appshunter.io/ios/app/function-fitter/id6748284369)

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

**In-app purchases:** none


## Frequently asked questions

### Is OneCryption free?

OneCryption is free to download, with in-app purchases available.

### Is Function Fitter free?

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

### Do OneCryption or Function Fitter have ads?

Neither OneCryption nor Function Fitter shows ads.

### Which is updated more often, OneCryption or Function Fitter?

OneCryption ships an update every 3 months, and Function Fitter monthly. Most recently, OneCryption was updated on September 29, 2026 and Function Fitter on September 9, 2026.

---

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