Random Reminder vs CRM Synthesis
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Random Reminder
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.
- Random sound interval reminders
- 10-second micro-breaks
- 90-minute focus sessions
- Neural replay for memory
- Variable ratio reinforcement
- Zeigarnik effect utilization
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“Random Reminder” is a new focus method designed to help you enter deep focus quickly. More than 400 people worldwide use it every second. With this method, you can stay focused for up to 90 minutes, improve your attention and memory, and enter a flow state more easily. == A New Focus Method == - Set a sound to play at random intervals (e.g., every 3–5 minutes). - Each time you hear the reminder sound, immediately close your eyes and rest for 10 seconds. - Then return to your work or study and continue focusing. Repeat this process until the 90-minute session ends. - After 90 minutes, take a 20-minute break. == Based on Four Core Principles == ■ Neural Replay During micro-breaks, your brain "replays" recently learned information at high speeds, improving memory retention and learning performance. ■ Variable Ratio Reinforcement Randomized feedback keeps the brain’s dopamine system engaged. Not knowing exactly when the next sound will occur maintains a healthy level of alertness and motivation. ■ Zeigarnik Effect Briefly interrupting a task creates a psychological "open loop." This makes your brain more eager to complete the task, helping you dive back in more effectively. ■ Ultradian Rhythms (90/20 Rule) The human brain naturally operates in 90-minute high-frequency cycles. Following this rhythm prevents burnout and maximizes mental endurance. ====== Personal growth website: https://zeenzeen.com Creator: 择恩 ====== “Random Reminder” can be downloaded and used for free. Core features are completely free. We also offer premium membership features to enhance the user experience. If you choose to subscribe to the premium membership, your iTunes account will be charged accordingly. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current subscription period. After subscribing, you can manage your subscription in your iTunes Store account settings. Privacy Policy https://zeenzeen.com/privacy Terms of Use https://zeenzeen.com/tos End User License Agreement https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
CRM Synthesis
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CRM Synthesis is a CRM solution designed for the solo sales or support professional: someone who wants serious customer relationship tools without a web-service subscription, advertisements, in-app purchases, upgrade tiers, or vendor lock-in. Both the iOS and macOS versions offer full functionality. No features are held back for a separate “premium” version, and there are no monthly fees. CRM Synthesis will store your data in your own iCloud account, not on any other servers. Your records and preferences will sync across your Apple devices without requiring any hosted CRM service. CRM Synthesis supports robust import and export options, including CSV and hierarchical JSON, so you can back up your data, move it between systems, or leave our product just as easily as you adopted it. CRM Synthesis supports Light Mode and Dark Mode, adjustable font scaling, general accessibility, and personalization. Basic Features CRM Synthesis supports core Customer Relationship Management workflows. You can create Organization records, related Contact records, and History records that track communication with each contact. You can also create Tasks, Opportunities, Cases and Assets. There is an email client, Apple Calendar integration, and support for both managing Notes in folder hierarchies and alternatively developing a Glossary. You can easily switch between these feature sets, and you can hide those you don’t use. Multiple Database Support CRM Synthesis lets you create separate databases for different purposes. You can use different databases for established clients and prospects, different product lines, or unrelated business efforts. Custom Properties You can customize user-defined fields for different record types, to best fit your business.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Random Reminder | CRM Synthesis |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 4.6 (18 ratings) — better | — |
| Positive reviews | 83.3% of reviews | — |
| Number of ratings | 18 — better | — |
| Update frequency | Weekly — better | Every 10 days |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | — |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 43 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | 志高 谢 | Outer Planet Labs LLC |
In-app purchases
Random Reminder
- 月度高级会员$2.991 Month
- 季度高级会员$9.993 Months
- 年度高级会员$24.991 Year
- 违约成本$0.99
CRM Synthesis
No in-app purchases
Questions
Is Random Reminder free?
Is CRM Synthesis free?
Do Random Reminder or CRM Synthesis have ads?
Which is updated more often, Random Reminder or CRM Synthesis?
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