# Aligner Smile Tracker vs NightCurve

The clearest difference is iOS requirement: Aligner Smile Tracker at 18.0 against NightCurve's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Aligner Smile Tracker sells 5 one-off in-app purchases and NightCurve sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Aligner Smile Tracker ships an update every 6 weeks, NightCurve monthly. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Aligner Smile Tracker | NightCurve |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/aligner-smile-tracker/id1535341862/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 43.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 74 MB | 10 MB |
| Requires iOS | **18.0** | 26.0 |
| Devices | iPhone, Apple Watch | iPhone, Apple Watch |
| Age rating | 4+ | 17+ |
| Developer | [Pocket Pixels LTD](https://appshunter.io/developer/479858885) | [Marcin Kwasniewski](https://appshunter.io/developer/1891152751) |

## What reviewers say

### Aligner Smile Tracker

[App page](https://appshunter.io/ios/app/aligner-smile-tracker/id1535341862)

This app helps users stay consistent with their orthodontic aligner treatment. It tracks wear time, monitors progress with photos, and sends helpful reminders to ensure users achieve their desired smile.

**Highlights:** Track aligner wear time, Monitor progress photos, Set wear time reminders, Receive aligner change notifications, Create smile transformation videos, Log daily aligner usage

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Adverts | $1.99 | one-time |
| 3 Credits | $2.99 | one-time |
| 10 Credits | $8.99 | one-time |
| 25 Credits | $19.99 | one-time |
| Smile Tracker Lifetime | $29.99 | one-time |


### NightCurve

[App page](https://appshunter.io/ios/app/nightcurve-drink-tracker/id6761733094)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $4.99 | per month |
| Premium Annual | $29.99 | per year |
| Premium Lifetime | $44.99 | one-time |


## Frequently asked questions

### Is Aligner Smile Tracker free?

Aligner Smile Tracker is free to download, with in-app purchases available.

### Is NightCurve free?

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

### Do Aligner Smile Tracker or NightCurve have ads?

Neither Aligner Smile Tracker nor NightCurve shows ads.

### Which is updated more often, Aligner Smile Tracker or NightCurve?

Aligner Smile Tracker ships an update every 6 weeks, and NightCurve monthly. Most recently, Aligner Smile Tracker was updated on October 29, 2026 and NightCurve on October 28, 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.*