ConvertCenter vs Murmur Keyboard
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ConvertCenter
This app offers tools to convert files between over 20 formats and resize or compress them efficiently. All processing occurs on your device, ensuring complete privacy and offline functionality. Optimize files for email, cloud storage, or social media with ease.
- Convert over 20 file formats
- Resize and compress files up to 90%
- Offline processing for complete privacy
- Preview files before saving
- Fast conversion with quality preservation
- Supports images, documents, and audio
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FILE TOOLS - CONVERT & RESIZE FILES WITH EASE Two powerful tools in one app: Convert files between formats and/or resize/compress them. All processing happens on your device for complete privacy. FILE CONVERTER Convert between 20+ file formats: • Images: JPG, PNG, HEIC, WebP, GIF, BMP, TIFF • Documents: PDF, TXT, RTF, HTML, Markdown • Audio: Extract from videos, convert formats • Fast conversion with quality preservation FILE RESIZER & COMPRESSOR Optimize your files with smart compression: • Resize images by percentage or exact pixels • Compress files by up to 90% • Reduce PDFs from GB to MB • Four compression levels to choose from • Perfect for email and cloud storage KEY FEATURES -Complete Privacy - All processing on your device -Preview Files - See results before saving -Size Statistics - View before/after comparison -Easy Sharing - Share to any app instantly -Lightning Fast - Process files in seconds -Beautiful Design - Intuitive and modern interface -Photo Integration - Import from library easily PERFECT FOR • Reducing file sizes for email attachments • Converting images for social media • Compressing large PDFs for sharing • Resizing photos to exact dimensions • Freeing up storage space • Preparing files for upload • Converting document formats • Optimizing images for websites WHY CHOOSE US? File Tools works offline with no file size limits, no watermarks, and unlimited conversions. Your files never leave your device. Download now and transform your files with ease!
Murmur Keyboard
This app converts your voice to text using advanced AI, all processed locally on your device for maximum privacy. It functions as a standalone application or a keyboard extension, allowing seamless dictation across any app without internet connectivity.
- 100% on-device transcription
- Offline functionality
- Custom keyboard for any app
- Smart warm/cold engine
- Dark mode support
- Transcription history
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Murmur turns your voice into text — entirely on your iPhone. No internet, no accounts, no data leaving your device. Powered by WhisperKit, Murmur runs a real speech recognition model locally, so your words stay yours. Use it as a standalone app or switch to the Murmur keyboard in any app — Messages, Notes, Mail, wherever you type. Tap the mic, speak naturally, and your transcription appears instantly. Most voice-to-text apps send your audio to the cloud. Murmur doesn't. It runs WhisperKit directly on your iPhone — no server, no account, no data collection. The new keyboard extension lets you dictate in any app, and v2.2 makes the whole flow feel faster and more polished in both light and dark mode. • 100% on-device transcription • Works offline, no cloud processing • Custom keyboard for dictation in any app • Smart warm/cold engine — fast when ready, clear when loading • Dark mode designed to feel intentional, not just inverted • Copy, share, or search your transcription history Your voice. Your words. Your device.
Screenshots
Verdict
The clearest difference is rating: ConvertCenter at 5.0 against Murmur Keyboard's 3.0. Murmur Keyboard's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, ratings volume, update cadence and in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
ConvertCenter holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.
ConvertCenter ships an update every 3 days, Murmur Keyboard every 5 days. The most recent releases landed on October 15, 2026 and October 24, 2026 respectively.
| Parameter | ConvertCenter | Murmur Keyboard |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 3.0 (2 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 3 days — better | Every 5 days |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 27.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Martha G Korra | John Wang |
Customer experience
ConvertCenter
Murmur Keyboard
In-app purchases
ConvertCenter
No in-app purchases
Murmur Keyboard
No in-app purchases









