# Pi vs Anniversary Countdown Tracker

Pi and Anniversary Countdown Tracker are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Pi ships an update every 5 months, Anniversary Countdown Tracker every 4 months. Both last shipped on October 12, 2026.

## The numbers

| Metric | Pi | Anniversary Countdown Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/pi-anniversary/id566743904/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 4 months** |
| Monetization | Free | — |
| Size | 4 MB | 4 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sestra Studio](https://appshunter.io/developer/566743907) | [LEAN ASIA CO., LTD](https://appshunter.io/developer/1815050814) |

## 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


### Anniversary Countdown Tracker

[App page](https://appshunter.io/ios/app/anniversary-countdown-tracker/id6772254699)

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

**In-app purchases:** none


## Frequently asked questions

### Is Pi free?

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

### Is Anniversary Countdown Tracker free?

Anniversary Countdown Tracker is free to download, with no in-app purchases.

### Do Pi or Anniversary Countdown Tracker have ads?

Neither Pi nor Anniversary Countdown Tracker shows ads.

### Which is updated more often, Pi or Anniversary Countdown Tracker?

Pi ships an update every 5 months, and Anniversary Countdown Tracker every 4 months. Most recently, Pi was updated on October 12, 2026 and Anniversary Countdown Tracker on October 12, 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.*