Carbon Voice vs Letterform
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Carbon Voice
This app allows teams to communicate asynchronously through voice messages that are transcribed and AI-summarized. It replaces phone calls with quick voice notes, making conversations searchable and actionable. Integrates with over 8,000 tools for seamless workflow management.
- Asynchronous voice messaging
- Automatic transcription
- AI conversation summaries
- Action item tracking
- Integration with 8,000+ tools
- Cross-language auto-translation
- Searchable voice memos
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Carbon Voice is built for teams who work on the move. Execs, real-estate agents, home builders, field sales teams—anyone doing real work in planes, trains, cars, and everywhere in between. Talk without calling. Skip the phone tag, scheduling, and missed connections. Just tap, talk, and keep working. Conversations happen asynchronously—fast, natural, and effortless. Voice messaging, finally done right. Every message is automatically transcribed, searchable, and AI-summarized so nothing gets lost. “Carbon Voice is a voice productivity powerhouse.” — Ari Meisel Turn conversations into action. Use AI to ask questions about any discussion, generate summaries, track action items, and push follow-ups into 8,000+ tools via Zapier. Your conversations become insight, action, and knowledge. ----- Key Features TAP TO TALK Share instantly and replace calls with asynchronous voice collaboration. Communicate across languages with auto-translation. READ & SEARCH Every message is transcribed. Search, label, organize, and follow up with ease. AI ORGANIZES FOR YOU AI summaries, action items, document generation, and the ability to ask AI anything about your conversations. ----- Voice Memos Capture your own ideas quickly. Keep them organized—or share them with teammates via link, email, or text. ----- Built for Business. Designed for People. Workspaces, SSO, retention policies, access controls, and enterprise-grade security keep your organization aligned and compliant—whether you’re a small team or a global company. ----- Quick Access to Your Voice Ideas - Home widgets for one-tap recording and conversation access - iMessage Extension for instant link sharing - Share Extension for saving audio and files into Carbon Voice - Access your voice memos on the web - Slack integration for notifications and quick access - Google Workspace integration for using Carbon Voice inside Gmail, Docs, and more Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://getcarbon.app/privacy Extended Terms of Service: https://getcarbon.app/tos
Letterform
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Letterform is a minimalist, local-first Markdown editor built for writers, developers, students, and thinkers who value absolute clarity and digital privacy. When the interface melts away, what remains is the pure connection between your thoughts and the screen. Letterform combines a powerful plaintext editor with a beautiful real-time previewer, allowing you to draft, structure, and refine your ideas without a single distraction. ELEGANT MARKDOWN EDITOR • Format seamlessly as you type with structured headers, text emphasis, blockquotes, and clean lists. • Access swift markdown shortcuts right from your custom keyboard toolbar. • Beautifully formatted typography makes both writing and editing an absolute pleasure. EFFORTLESS LOCAL DEEP ORGANIZATION • Keep your workspace perfectly structured using a clean, uncluttered folder architecture. • Track your metrics at a glance with built-in character counters. • Total Privacy: Your documents stay completely local on your device. Your words are entirely yours. BEYOND PLAIN TEXT • Embed rich media and image attachments natively into your workspace. • Preview rendered markdown output instantly with a single tap. • Manage, rename, and organize assets alongside your writing. Strip away the visual noise. Reclaim your focus. Experience the art of intentional writing with Letterform.
Screenshots
Verdict
The clearest difference is in-app purchases: Letterform at none against Carbon Voice's 10. On price, 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
Both are free to download. Carbon Voice sells 10 in-app purchases, starting at $6.99 per month. Letterform asks for nothing beyond the download.
| Parameter | Carbon Voice | Letterform |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (15 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 15 — better | — |
| Update frequency | Every 2 days | — |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 174 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Phonon X Inc | Good Code Club |
In-app purchases
Carbon Voice
- Starter + Global Voice7 Days trial$6.991 Month
- Lite7 Days trial$10.991 Month
- Standard7 Days trial$17.991 Month
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- Standard + Global Voice7 Days trial$23.991 Month
- Pro7 Days trial$26.991 Month
- Lite14 Days trial$84.991 Year
- Lite + Global Voice14 Days trial$149.991 Year
- Standard14 Days trial$155.991 Year
- Standard + Global Voice14 Days trial$219.991 Year
- Pro14 Days trial$259.991 Year
Letterform
No in-app purchases









