Write a letter vs CRM Synthesis
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Write a letter
Create professional letters quickly and easily. Save them as PDFs for emailing, printing, or sharing. Customize your letters with formatting, templates, and fonts to match your style.
- Professional letter creation
- PDF export
- Email, print, and share options
- Customizable templates
- Text formatting
- Signature integration
- Sender address management
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With this app you can write professional letters in just a few minutes. Your letter is saved as a PDF and can be sent by email, printed, or shared via AirDrop at any time. With your signature if you wish. It's that simple: create a sender, enter the recipient, write the letter, done. Design your letters entirely to your own style. The editor supports text formatting such as Bold, Underline and more, so you can highlight important content precisely. Choose between a classic and modern template or create your own letter template with the template generator. Three built-in fonts as well as all fonts installed on your device are available for display. A4 and US Letter are supported. You can save any number of sender addresses, for example private and business, and simply select the right one when writing. Feedback and suggestions for improvement are always welcome. EULA: 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: Write a letter at Free against CRM Synthesis's $4.99. CRM Synthesis's advantage is in-app purchases (none vs 3) and update cadence (every 10 days vs every 3 months). On ads, device support and iOS requirement 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
Write a letter is free to download; CRM Synthesis costs $4.99 up front. Write a letter sells 3 in-app purchases, starting at $2.99 per month. CRM Synthesis asks for nothing beyond the download.
Write a letter ships an update every 3 months, CRM Synthesis every 10 days. The most recent releases landed on November 1, 2026 and October 27, 2026 respectively.
| Parameter | Write a letter | CRM Synthesis |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 4.0 (29 ratings) — better | — |
| Positive reviews | 27.4% of reviews | — |
| Number of ratings | 29 — better | — |
| Update frequency | Every 3 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 26.0 |
| Further details — not scored | ||
| Size | 40 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | Jan-Hendrik Damerau | Outer Planet Labs LLC |
In-app purchases
Write a letter
- Monthly Premium$2.991 Month
- Annual Premium$22.991 Year
- Lifetime Premium$39.99
CRM Synthesis
No in-app purchases









