# OT vs ContactFixer

The clearest difference is update cadence: ContactFixer at every 2 days against OT's every 2 weeks. OT's advantage is iOS requirement (13.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

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

OT ships an update every 2 weeks, ContactFixer every 2 days. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | OT | ContactFixer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/contactfixer/id6761673183/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 2 days** |
| Monetization | — | Free |
| Size | 65 MB | 1 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [WIN LWIN OO](https://appshunter.io/developer/1859417709) | [Joe Wilson](https://appshunter.io/developer/1885259449) |

## What reviewers say

### OT

[App page](https://appshunter.io/ios/app/ot-attn/id6756235478)

**In-app purchases:** none


### ContactFixer

[App page](https://appshunter.io/ios/app/contactfixer/id6761673183)

This app automatically formats your US phone numbers into a consistent E.164 format, ensuring better compatibility with messaging and calling services. It scans your contacts, provides a preview of changes, and applies them instantly without needing an internet connection.

**Highlights:** Automatic US phone number formatting, E.164 format conversion, Preview changes before applying, Instant contact updates, Offline functionality, Privacy-focused, no data collection

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

**In-app purchases:** none


## Frequently asked questions

### Is OT free?

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

### Is ContactFixer free?

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

### Do OT or ContactFixer have ads?

Neither OT nor ContactFixer shows ads.

### Which is updated more often, OT or ContactFixer?

OT ships an update every 2 weeks, and ContactFixer every 2 days. Most recently, OT was updated on October 24, 2026 and ContactFixer on October 25, 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.*