# ESF Mobile vs Relationship tracker

The clearest difference is in-app purchases: ESF Mobile at none against Relationship tracker's 6. ESF Mobile also leads on device support (3 vs 1) and iOS requirement (13.0 vs 18.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Relationship tracker sells 6 in-app purchases, starting at $0.99 per 7 days. ESF Mobile asks for nothing beyond the download.

ESF Mobile ships an update fortnightly, Relationship tracker every 2 weeks. The most recent releases landed on October 11, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | ESF Mobile | Relationship tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (11 ratings)](https://appshunter.io/ios/app/relationship-tracker-duo/id6759326768/reviews)** |
| Number of ratings | — | **11** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 82 MB | 39 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [UC Merced](https://appshunter.io/developer/1148124271) | [Lyndavan Doan](https://appshunter.io/developer/1764619575) |

## What reviewers say

### ESF Mobile

[App page](https://appshunter.io/ios/app/esf-mobile/id6752670873)

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

**In-app purchases:** none


### Relationship tracker

[App page](https://appshunter.io/ios/app/relationship-tracker-duo/id6759326768)

This app provides a private space for couples to track their relationship journey. It offers features like a live dating counter, a shared timeline for memories and milestones, and widgets to display relationship progress. It's designed to help couples celebrate their connection, whether they are new, long-distance, or married.

**Highlights:** Live dating counter, Shared moments timeline, Memory mapping, Private couple space, Home screen widgets, Distance tracking for LDRs

**Features:** Family Sharing

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Duo Pro (Week) | $0.99 | per 7 days |
| Duo Pro (Week) | $2.99 | per 7 days |
| Duo Pro (Annual) | $8.99 | per year |
| Duo Pro (Annual) | $17.99 | per year |
| Duo Pro (Lifetime) | $14.99 | one-time |
| Duo Pro (Lifetime) | $29.99 | one-time |


## Frequently asked questions

### Is ESF Mobile free?

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

### Is Relationship tracker free?

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

### Do ESF Mobile or Relationship tracker have ads?

Neither ESF Mobile nor Relationship tracker shows ads.

### Which is updated more often, ESF Mobile or Relationship tracker?

ESF Mobile ships an update fortnightly, and Relationship tracker every 2 weeks. Most recently, ESF Mobile was updated on October 11, 2026 and Relationship tracker on October 8, 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.*