Letters vs Dev Promo Kit
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Letters
Organize and read all your subscribed newsletters in one clean, dedicated space outside your inbox. It automatically finds your newsletters and keeps your reading data private on your device.
- Organize all newsletters
- Automatic newsletter detection
- Clean reading environment
- Offline access
- Read/unread tracking
- Search across all newsletters
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You subscribed to 30 newsletters. You're reading 3. The rest are buried in your inbox β unread, forgotten, quietly becoming guilt. You keep meaning to get to them. You don't. Letters is built for this exact problem. Connect your inbox and in under 60 seconds, Letters reveals your complete newsletter library β every publisher you've subscribed to, organised and ready to read. Outside your inbox. Without the noise. ββ BUILT DIFFERENT: YOUR DATA STAYS ON YOUR DEVICE Most email apps pass your data through their servers. Letters doesn't. Your newsletters are processed and stored locally on your device only. We connect via secure OAuth. No emails stored on our end. No data sold. No backend that knows your reading habits. For professionals who handle sensitive information β this matters. ββ WHAT YOU GET β’ Your complete newsletter library β every publisher, instantly visible β’ Auto-detection: Letters finds your newsletters, you don't hunt for them β’ Clean reader built for long-form content, not quick email scanning β’ Offline access β read on flights, commutes, anywhere β’ Read/unread tracking so nothing gets missed β’ Search across everything you've ever received ββ WHO LETTERS IS BUILT FOR Professionals who read newsletters seriously: β VCs and investors tracking market intelligence across 20+ sources β Consultants who need to stay sharp across industries without inbox chaos β B2B marketers monitoring trends and competitor content β Anyone who subscribes intentionally and wants to actually read what they chose ββ Letters is not an email app. It's not a feed. It's the reading environment your newsletters always deserved. Free to download. Your library is ready in under 60 seconds. ____ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Dev Promo Kit
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Promo Kit is a simple, powerful utility for iOS developers to manage and share App Store promo codes β all in one place. Stop juggling notes, spreadsheets, and screenshots. Promo Kit lets you organize promo codes by app, track which ones have been used, and share them instantly with reviewers, testers, or customers. Key Features β’ Search & Add Apps Find your app directly from the App Store or add it manually to your list. β’ Paste Promo Codes in Bulk Quickly paste multiple promo codes at once. Promo Kit automatically organizes them by app. β’ Share with Confidence Share promo codes via copy, system share sheet, or beautifully formatted cards with QR codes. β’ Track Used Codes Mark promo codes as used so you always know whatβs still available. β’ Expiration Awareness Promo codes expire after 28 days. Promo Kit tracks expiration dates so you donβt lose unused codes. β’ Developer-First Design Clean interface, no accounts required, and no unnecessary friction. Promo Kit is built for indie developers, teams, and anyone who distributes App Store promo codes regularly. The app is free to use. Optional tips are available if youβd like to support development β thank you!
Screenshots
Verdict
The clearest difference is iOS requirement: Letters at 15.0 against Dev Promo Kit's 17.6. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Letters sells 3 in-app purchases, starting at $2.99 per month and Dev Promo Kit sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
| Parameter | Letters | Dev Promo Kit |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | β |
| Update frequency | Every 2 weeks | β |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | β |
| Devices | iPhone, iPad, iPod β better | iPhone, iPad |
| Requires iOS | 15.0 β better | 17.6 |
| Further details β not scored | ||
| Size | 141 MB | 5 MB |
| Age rating | 9+ | 4+ |
| Developer | Rishab Jaiswal | Mobile Applicability Inc |
In-app purchases
Letters
- Letters Pro | Monthly Plan7 Days trial$2.991 Month
- Letter Pro Yearly1 Month trial$29.991 Year
- Letters Pro Lifetime$149.00
Dev Promo Kit
- Promo Kit Small Tip$2.99
- Promo Kit Medium Tip$9.99
- Promo Kit Large tip$99.99









