# Relativity Calendar vs NanoLuna

The clearest difference is in-app purchases: Relativity Calendar at none against NanoLuna's 1. Relativity Calendar also leads on iOS requirement (15.0 vs 26.0). NanoLuna's advantage is update cadence (fortnightly vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. NanoLuna sells 1 one-off in-app purchase. Relativity Calendar asks for nothing beyond the download.

Relativity Calendar ships an update every 2 months, NanoLuna fortnightly. The most recent releases landed on November 7, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Relativity Calendar | NanoLuna |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (17 ratings)](https://appshunter.io/ios/app/relativity-calendar/id1481494405/reviews)** | — |
| Number of ratings | **17** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 3 MB | 11 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jonathan Cole](https://appshunter.io/developer/1093735229) | [恒俭 董](https://appshunter.io/developer/947356968) |

## What reviewers say

### Relativity Calendar

[App page](https://appshunter.io/ios/app/relativity-calendar/id1481494405)

This app redefines how you view dates by allowing you to express any day relative to any month. See custom dates like 'May 32nd' or 'March 93rd' at a glance. It offers home screen widgets and Apple Watch complications for easy access.

**Highlights:** Express dates relative to any month, Home screen widgets with color customization, Apple Watch complications, iOS 16 Lock Screen widgets, Track custom dates and holidays

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### NanoLuna

[App page](https://appshunter.io/ios/app/nanoluna/id6759160468)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Lifetime | $0.99 | one-time |


## Frequently asked questions

### Is Relativity Calendar free?

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

### Is NanoLuna free?

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

### Do Relativity Calendar or NanoLuna have ads?

Neither Relativity Calendar nor NanoLuna shows ads.

### Which is updated more often, Relativity Calendar or NanoLuna?

Relativity Calendar ships an update every 2 months, and NanoLuna fortnightly. Most recently, Relativity Calendar was updated on November 7, 2026 and NanoLuna on November 9, 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.*