Let's Sync vs Keywave
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Let's Sync
Synchronize audio across multiple smartphones for shared listening experiences. Create events for silent dances, interactive stories, group workouts, and more. It's a versatile platform for personal and business use, supporting thousands of concurrent participants.
- Synchronizes audio across multiple smartphones
- Creates shared listening events
- Supports silent dances and interactive stories
- Enables group workouts and worldwide events
- Platform for unique business ventures
- Supports up to 7,000 concurrent participants
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Letβs Sync synchronizes audio across multiple smartphones. It is used to create events in which multiple participants hear the audio from their phones at the same time. Let's Sync creates the following types of events Silent Dances in Nature Story Foolery Interactive Stories Story Dating Events Story Gatherings Interactive Story Telling Toys Multilevel Yoga Classes Worldwide Events Sync your favourite playlist with your friends while running, biking and skiing. Let's Sync has many uses and is only limited to your imagination. What will you create? Letβs Sync is free to use and can support up to 7,000 concurrent participants, more with advanced notices. Letβs Sync synchronizes audio across smartphones. It works anywhere where there is internet connection. Letβs Sync can be a platform for your own unique business. Lead your own ecstatic dance events in nature, raise money for your favorite causes, teach simultaneous multi-level yoga classes, or create content for others to use and get paid every time they do. What will you create?
Keywave
This app provides robust PGP encryption and decryption capabilities directly on your device. It allows you to generate, manage, import, and export PGP keys locally, ensuring your data remains private and secure without server reliance.
- Encrypt and decrypt messages
- Generate PGP keys (2048-4096 bit)
- Manage unlimited local keys
- Import keys from files or clipboard
- Export keys in various formats
- 100% local processing
- Zero data collection
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PGP encryption for people who value their privacy. Everything runs on your device. No servers, no tracking, no compromises. WHAT IT DOES Keywave is a native iOS app for PGP encryption and decryption. Encrypt messages before you send them. Decrypt the ones you receive. Manage your keys. That's it. Everything runs locally using Protonmail's open-source gopenpgp library. Your keys never leave your phone. We can't see them even if we wanted to. CORE FEATURES β’ Encrypt & Decrypt Messages Swipe to switch modes. Select your keys. Tap to encrypt or decrypt. Copy the result. Done. β’ Generate PGP Keys Create new keypairs at 2048, 3072, or 4096-bit RSA. Optional password protection. Takes seconds. β’ Key Management Store unlimited keys on your device. Search by name, email, or fingerprint. Filter by public, private, expiring, or expired. Sort by name, date, type, or fingerprint. β’ Import Keys Open key files (.asc, .gpg, .key, .pub, .pem) from the Files app, paste from the clipboard, or share text straight into Keywave from another app. β’ Export Keys ASCII Armored or binary. Save to Files, share to another app, or copy to the clipboard. β’ Clean iOS Design Native SwiftUI. Haptic feedback. Dark by default. No clutter. WHY KEYWAVE Most PGP apps are ugly, complicated, or both. We're neither. β’ 100% Local Processing No servers. No cloud. No network requests at all. Everything happens on your device. β’ Zero Data Collection We don't collect, store, or see your data. No analytics. No tracking. No telemetry. β’ Open Source Foundation Built on Protonmail's battle-tested gopenpgp library. Transparent. Auditable. β’ iOS-Native Designed for iOS from the start. Not a port. Not a web page in a wrapper. WHO IT'S FOR β’ Privacy-conscious individuals β’ People tired of bloated encryption tools β’ Anyone who needs PGP without the complexity β’ Users who want their data to stay on their device SECURITY β’ Keys stored in the iOS Keychain β’ Password prompts for protected keys β’ Signature verification when you decrypt β’ No plaintext storage of sensitive data β’ Standard OpenPGP, so it works with GPG and other PGP tools WHAT IT'S NOT This isn't a messaging app. We don't send anything. We encrypt and decrypt text; you send it however you like. This isn't cloud-based. Everything stays on your device. If you want backups, export your keys yourself. This isn't for everyone. If you need someone to explain why encryption matters, we're not that app. THE FINE PRINT β’ Free. Every feature included. β’ No ads. No in-app purchases. β’ Requires iOS 17.6 or later β’ Works completely offline β’ Export your keys to keep your own backups Privacy isn't a feature. It's the whole point.
Screenshots
Verdict
The clearest difference is in-app purchases: Keywave at none against Let's Sync's 10. Let's Sync's advantage is review sentiment (67% vs 33%) and update cadence (monthly vs every 4 months). On price, ads 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. Let's Sync sells 10 one-off in-app purchases. Keywave asks for nothing beyond the download.
Let's Sync ships an update monthly, Keywave every 4 months. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.
| Parameter | Let's Sync | Keywave |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 66.7% of reviews β better | 33.3% of reviews |
| Update frequency | Monthly β better | Every 4 months |
| Ads | No | No |
| In-app purchases | Yes | No β better |
| Monetization | Free with in-app purchases | Free β better |
| Devices | iPhone, iPod β better | iPhone |
| Requires iOS | 13.0 β better | 17.6 |
| Further details β not scored | ||
| Size | 92 MB | 13 MB |
| Age rating | 12+ | 4+ |
| Developer | Terra Virgo Corporation | William Kelley |
Customer experience
Let's Sync
Keywave
In-app purchases
Let's Sync
- Add 5 credits to wallet$4.99
- Add 21 credits to wallet$20.99
- Add 22 credits to wallet$21.99
Show 7 moreShow fewer
- Add 23 credits to wallet$22.99
- Add 24 credits to wallet$23.99
- Add 25 credits to wallet$24.99
- Add 26 credits to wallet$25.99
- Add 27 credits to wallet$26.99
- Add 28 credits to wallet$27.99
- Add 29 credits to wallet$28.99
Keywave
No in-app purchases









