# Pendulum vs DJOLT

The clearest difference is in-app purchases: DJOLT at none against Pendulum's 5. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Pendulum sells 5 one-off in-app purchases. DJOLT asks for nothing beyond the download.

Pendulum ships an update every 9 days, DJOLT fortnightly. The most recent releases landed on September 10, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Pendulum | DJOLT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (16 ratings)](https://appshunter.io/ios/app/pendulum-pen-pal-tracker/id6444290573/reviews)** | — |
| Number of ratings | **16** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 days** | Fortnightly |
| Monetization | Free with in-app purchases | — |
| Size | 5 MB | 69 MB |
| Requires iOS | **17.0** | 17.5 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Benjamin Cardy](https://appshunter.io/developer/1588708175) | [Matthew Johl](https://appshunter.io/developer/1747866453) |

## What reviewers say

### Pendulum

[App page](https://appshunter.io/ios/app/pendulum-pen-pal-tracker/id6444290573)

This app helps you manage your pen pal relationships by tracking correspondence. Record when you send and receive letters, note writing materials, and set reminders to stay in touch. Sync your data across devices for seamless management.

**Highlights:** Track sent and received letters, Record pen, ink, and paper used, Set reminders to write and post, Monitor letter delivery times, iCloud sync across devices

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Extra Fine Tip | $0.99 | one-time |
| Fine Tip | $1.99 | one-time |
| Medium Tip | $3.99 | one-time |
| Broad Tip | $5.99 | one-time |
| Stub Tip | $9.99 | one-time |


### DJOLT

[App page](https://appshunter.io/ios/app/djolt/id6503046371)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Pendulum free?

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

### Is DJOLT free?

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

### Do Pendulum or DJOLT have ads?

Neither Pendulum nor DJOLT shows ads.

### Which is updated more often, Pendulum or DJOLT?

Pendulum ships an update every 9 days, and DJOLT fortnightly. Most recently, Pendulum was updated on September 10, 2026 and DJOLT on September 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.*