# Pendulum - Pen Pal Tracker — Track your letters to friends > Track pen pal letters, writing supplies, and correspondence timelines. (iPhone/iPad app by Benjamin Cardy.) - Source: https://appshunter.io/ios/app/pendulum-pen-pal-tracker/id6444290573 (this page in markdown: same URL + `.md`) - Developer: [Benjamin Cardy](https://appshunter.io/developer/1588708175) - Category: Utilities, Productivity - Price: Free with in-app purchases - Rating: 4.20/5 from 16 App Store ratings · 9 written reviews indexed - Age rating: 4+ - Requires: iOS 17.0 · 5 MB - Languages: American English - Released: 2022-11-24 - Data updated: 2026-08-29 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/pendulum-pen-pal-tracker/id6444290573/reviews.md ## What is Pendulum? Pendulum - keep track of your pen pals! • Add your friends, record when you send them letters or they send something to you. See how long it takes for your letters to arrive! • Record what pen, ink, and paper you used to write to each person, to keep the variety going each time you write. • Reminders to write back, or to post letters you've written but have sat by the front door for ages; you won't forget to stay in touch again. • Sync via iCloud, so you can keep up to date regardless of what device you have to hand. ## Key features - 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 ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | 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 | ## Recent user reviews (9 of 9) All indexed reviews: https://appshunter.io/ios/app/pendulum-pen-pal-tracker/id6444290573/reviews.md ### 5/5 — Has become invaluable to me *2026-08-14* This is the app that I didn’t know I needed until I started using it — and now I can’t imagine trying to keep track of my correspondence without it it. The “add photo” feature is especially appreciated. I can take a picture of a letter or postcard before I send it so I have a reminder of what I said later. 😀 The developer is very responsive to questions and feedback. ### 3/5 — Has potential *2026-04-06* I’ve been using this for a while now and so far it’s been nice to use. I just think there needs to be more updates on the app. ### 5/5 — Easy to use *2025-04-24* Super clean and easy to use. Love it. ### 2/5 — Interesting but unwieldy *2024-11-17* The app has potential, but it isn’t intuitive and is a bit unwieldy. It’s frustrating not to be able to add addresses and I will not link things to my address book. It isn’t clear how to delete things and on a few records I ended up with very confusing notes on whether I’d sent a letter or not. It’s nice to be able to add pics of letters. All in all, pen and paper work better for me. ### 4/5 — Love this app *2023-11-18* Makes keeping track of my penpal so much easier. One thing I would change if I could is to have a place for peoples addresses if you don’t use your contact list. I don’t want to add all my penpals to my normal contact list so I have to keep addresses on paper. Overall, absolutely love this app ### 1/5 — Erased my progress *2023-05-18* I spent hours putting my penpals into this app. The WHOLE time it either made duplicates of stuff I made or removed them! It’s so annoying! I finally spent hours getting everything in and when I reopen app, half my stuff is gone?! WHAT! WOULD NOT RECOMMEND IF YOU WANT UNSTABLE APP! ### 5/5 — Amazing App for PenPals! *2023-05-16* I thought I’d give this app a try since I basically just have a spreadsheet to track things and it’s been amazing! It tells you exactly when you sent mail, how many days it’s been since you received mail, etc… Been such help keeping all my correspondences organized. And you can add pictures of your pen pals for their profile and also any past letters you’ve sent so you can reference them! ### 5/5 — Brilliant *2023-03-20* What a brilliant app it has me so much better organised and I absolutely recommend this to others ### 5/5 — Brilliant *2022-11-25* This is a fantastic app made by some tremendously fantastic developers. Perfect for all your penpally needs! Only thing it doesn’t do is write the letters for you 😆 ## Frequently asked questions about Pendulum ### What is Pendulum used for? Pendulum is a utility app designed to help you track your pen pal relationships. You can record when you send and receive letters, note the writing materials used, and set reminders to ensure you stay in touch. ### Is Pendulum free to use? Yes, Pendulum is free to download and use. It also offers in-app purchases for additional features or content. ### Does Pendulum have ads? No, Pendulum does not contain advertisements, providing an uninterrupted user experience. ### What devices does Pendulum support? Pendulum is available for iPhone and iPad devices, allowing you to manage your pen pal correspondence across Apple's mobile platforms. ### How often is Pendulum updated? The app was last updated on November 6, 2025, indicating a recent focus on maintenance and potential improvements. ### What is the age rating for Pendulum? Pendulum has an age rating of 4+, making it suitable for a wide range of users, including younger individuals who engage in letter writing. ### Can I sync Pendulum data across devices? Yes, Pendulum supports iCloud sync, allowing you to keep your pen pal tracking information up-to-date on all your compatible devices. ### What do users think of Pendulum? Pendulum has a rating of 4.0 stars based on 11 user ratings, suggesting a generally positive reception from its user base. ## Version history (last 5 releases) ### 1.22 — 2026-08-27 Filter your statistics by year for more useful insights into your writing habits. Thanks for the suggestion, Marlene! ### 1.21 — 2026-08-24 Fix for camera or photo picker dismissing itself when adding photos to an event. ### 1.20 — 2026-08-20 Fixes an issue where removing a nickname from a Contact wouldn't remove it from their related Pen Pal record. Thanks, Kris! ### 1.19 — 2026-08-18 • Custom stationery tracking! Add your own items to track for each letter you send. What type of envelope did you use? Was it sent with a special stamp? What about a wax seal? Track it all! • New options to sort your Pen Pals with sent or received letters differently from each other. ### 1.18 — 2026-08-11 Custom stationery tracking! Add your own items to track for each letter you send. What type of envelope did you use? Was it sent with a special stamp? What about a wax seal? Track it all! ## Apps similar to Pendulum | App | Rating | Price | Category | | --- | --- | --- | --- | | [Set Lists Pro](https://appshunter.io/ios/app/set-lists-pro/id6745643806) | — | Free | Utilities | | [Birthday Countdown: CandlesUp](https://appshunter.io/ios/app/birthday-countdown-candlesup/id6744033985) | 4.7 (528) | Free | Utilities | | [Aircircle](https://appshunter.io/ios/app/aircircle/id6499499795) | — | Free | Utilities | | [TimeLeft: Countdown Widget App](https://appshunter.io/ios/app/timeleft-countdown-widget-app/id1527416109) | — | Free | Utilities | | [Notebook: Note Taking](https://appshunter.io/ios/app/notebook-note-taking/id6748007452) | 4.2 (17) | Free | Utilities | | [Deliveries: a package tracker](https://appshunter.io/ios/app/deliveries-a-package-tracker/id290986013) | 4.6 (34,320) | Free | Utilities | ## More apps by Benjamin Cardy - [Elsewhen](https://appshunter.io/ios/app/elsewhen/id1588708173) All apps by Benjamin Cardy: https://appshunter.io/developer/1588708175 ## Related topics [getting out pen pals](https://appshunter.io/ios/topics/getting-out-pen-pals) · [pendulum](https://appshunter.io/ios/topics/pendulum) · [pendulum charts lite](https://appshunter.io/ios/topics/pendulum-charts-lite) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-29.*