# Random Reminder vs CRM Synthesis

The clearest difference is price: Random Reminder at Free against CRM Synthesis's $4.99. Random Reminder also leads on device support (4 vs 2) and iOS requirement (15.0 vs 26.0). CRM Synthesis's advantage is in-app purchases (none vs 4). On update cadence and ads there is nothing between them.

Random Reminder is free to download; CRM Synthesis costs $4.99 up front. Random Reminder sells 4 in-app purchases, starting at $2.99 per month. CRM Synthesis asks for nothing beyond the download.

Random Reminder ships an update weekly, CRM Synthesis every 10 days. The most recent releases landed on October 14, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Random Reminder | CRM Synthesis |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[4.6 (18 ratings)](https://appshunter.io/ios/app/random-reminder-focus-timer/id6745423696/reviews)** | — |
| Number of ratings | **18** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 10 days |
| Monetization | Freemium | — |
| Size | 43 MB | 28 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [志高 谢](https://appshunter.io/developer/1811717824) | [Outer Planet Labs LLC](https://appshunter.io/developer/304428595) |

## What reviewers say

### Random Reminder

[App page](https://appshunter.io/ios/app/random-reminder-focus-timer/id6745423696)

This app helps you achieve deep focus quickly through a unique method involving random sound reminders and short breaks. It's designed to improve attention, memory, and learning performance by leveraging principles like neural replay and ultradian rhythms.

**Highlights:** Random sound interval reminders, 10-second micro-breaks, 90-minute focus sessions, Neural replay for memory, Variable ratio reinforcement, Zeigarnik effect utilization

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月度高级会员 | $2.99 | per month |
| 季度高级会员 | $9.99 | per 3 months |
| 年度高级会员 | $24.99 | per year |
| 违约成本 | $0.99 | one-time |


### CRM Synthesis

[App page](https://appshunter.io/ios/app/crm-synthesis/id6786048464)

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

**In-app purchases:** none


## Frequently asked questions

### Is Random Reminder free?

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

### Is CRM Synthesis free?

CRM Synthesis costs $4.99, with no in-app purchases.

### Do Random Reminder or CRM Synthesis have ads?

Neither Random Reminder nor CRM Synthesis shows ads.

### Which is updated more often, Random Reminder or CRM Synthesis?

Random Reminder ships an update weekly, and CRM Synthesis every 10 days. Most recently, Random Reminder was updated on October 14, 2026 and CRM Synthesis on September 25, 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.*