# Pi vs Locket

The clearest difference is in-app purchases: Pi at none against Locket's 2. Pi also leads on ads (none vs shown). Locket's advantage is update cadence (every 2 weeks vs every 5 months). On price, rating, ratings volume and device support there is nothing between them.

Both are free to download. Locket sells 2 in-app purchases, starting at $4.99 per 7 days. Pi asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Pi against 5.0 for Locket. Both are backed by a comparable volume of ratings — 2 and 4 respectively.

Pi ships an update every 5 months, Locket every 2 weeks. The most recent releases landed on October 19, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Pi | Locket |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/pi-anniversary/id566743904/reviews) | [5.0 (4 ratings)](https://appshunter.io/ios/app/locket-relationship-tracker/id6745304838/reviews) |
| Number of ratings | 2 | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 4 MB | 65 MB |
| Requires iOS | 16.6 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Sestra Studio](https://appshunter.io/developer/566743907) | [Sans Software, LLC](https://appshunter.io/developer/1739951106) |

## What reviewers say

### Pi

[App page](https://appshunter.io/ios/app/pi-anniversary/id566743904)

Never miss an important date again! This app helps you save and track anniversaries with custom reminders. It supports various time units and allows you to create your own event parameters for personalized tracking.

**Highlights:** Save and track anniversaries, Customizable reminders, Support for various time units, Create custom event parameters, Track nerdy and significant events

**Features:** macOS Compatibility

**In-app purchases:** none


### Locket

[App page](https://appshunter.io/ios/app/locket-relationship-tracker/id6745304838)

Track your relationship journey and celebrate milestones together. See your time together in days, weeks, and more, and receive automatic anniversary reminders. Share photos and special moments with your partner.

**Highlights:** Relationship time tracking, Anniversary reminders, Home screen widget, Photo sharing, Milestone celebration

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited access | $4.99 | per 7 days |
| Unlimited access | $39.99 | per year |


## Frequently asked questions

### Is Pi free?

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

### Is Locket free?

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

### Which has better reviews, Pi or Locket?

Pi and Locket are both rated 5.0 out of 5 on the App Store, from 2 and 4 ratings respectively.

### Do Pi or Locket have ads?

Locket shows ads; Pi does not.

### Which is updated more often, Pi or Locket?

Pi ships an update every 5 months, and Locket every 2 weeks. Most recently, Pi was updated on October 19, 2026 and Locket on October 24, 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.*