# JustPayApp vs Blacklyf

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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

JustPayApp ships an update every 3 months, Blacklyf every 4 months. The most recent releases landed on May 16, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | JustPayApp | Blacklyf |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/blacklyf/id6747386086/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | — | Ad-supported |
| Size | 53 MB | 387 MB |
| Requires iOS | 13.4 | **13** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lotus Technologies Ltd.](https://appshunter.io/developer/1113361835) | [CANNUR MARKETING LTD](https://appshunter.io/developer/1821181018) |

## What reviewers say

### JustPayApp

[App page](https://appshunter.io/ios/app/justpayapp/id6503290990)

**Features:** macOS Compatibility

**In-app purchases:** none


### Blacklyf

[App page](https://appshunter.io/ios/app/blacklyf/id6747386086)

This app connects to smartwatches to track daily activity, sleep patterns, and health metrics. It allows for watch face customization, smart alarms, and notification management. Users can also control media, manage calls, and ensure data privacy.

**Highlights:** All-day activity and sleep tracking, Watch face personalization, Smart alarms and reminders, Notification management, Remote media and call control, Intuitive interface

**In-app purchases:** none


## Frequently asked questions

### Is JustPayApp free?

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

### Is Blacklyf free?

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

### Do JustPayApp or Blacklyf have ads?

Blacklyf shows ads; JustPayApp does not.

### Which is updated more often, JustPayApp or Blacklyf?

JustPayApp ships an update every 3 months, and Blacklyf every 4 months. Most recently, JustPayApp was updated on May 16, 2026 and Blacklyf on September 15, 2026.

---

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