# Debt Clock vs Forgetting Curve Reminder

The clearest difference is price: Debt Clock at Free against Forgetting Curve Reminder's $1.99. Debt Clock also leads on iOS requirement (13.0 vs 17.0). Forgetting Curve Reminder's advantage is in-app purchases (none vs 2) and ads (none vs shown). On update cadence and device support there is nothing between them.

Debt Clock is free to download; Forgetting Curve Reminder costs $1.99 up front. Debt Clock sells 2 in-app purchases, starting at $1.99 per month. Forgetting Curve Reminder asks for nothing beyond the download.

Debt Clock ships an update every 2 days, Forgetting Curve Reminder every 4 days. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Debt Clock | Forgetting Curve Reminder |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Positive reviews | — | 88.9% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Every 4 days |
| Monetization | — | Paid |
| Size | 25 MB | 3 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | +4 |
| Developer | [Kanta Osumi](https://appshunter.io/developer/1872595837) | [Manabi Mate LLC](https://appshunter.io/developer/1817627045) |

## What reviewers say

### Debt Clock

[App page](https://appshunter.io/ios/app/debt-clock/id6758671250)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアムプラン（月額） | $1.99 | per month |
| プレミアムプラン（年額） | $14.99 | per year |


### Forgetting Curve Reminder

[App page](https://appshunter.io/ios/app/forgetting-curve-reminder/id6760619904)

This app helps you remember what you learn by scheduling reviews based on the Ebbinghaus forgetting curve. Create study items, receive timely reminders, and track your progress with ease. All your data is stored locally for enhanced privacy.

**Highlights:** Scientific review scheduling, Local reminders, Progress tracking, One-tap completion, Review history, Customizable intervals

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

**In-app purchases:** none


## Frequently asked questions

### Is Debt Clock free?

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

### Is Forgetting Curve Reminder free?

Forgetting Curve Reminder costs $1.99, with no in-app purchases.

### Do Debt Clock or Forgetting Curve Reminder have ads?

Debt Clock shows ads; Forgetting Curve Reminder does not.

### Which is updated more often, Debt Clock or Forgetting Curve Reminder?

Debt Clock ships an update every 2 days, and Forgetting Curve Reminder every 4 days. Most recently, Debt Clock was updated on October 25, 2026 and Forgetting Curve Reminder on October 28, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*