CIRCUL+ vs Letterly
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CIRCUL+
This utility app connects to a wearable device to monitor vital health metrics like oxygen saturation, heart rate, and sleep patterns. It generates health reports and syncs data with Apple Health, offering insights into your well-being.
- Bluetooth connectivity
- Daily, operation, and sleep monitoring
- Blood pressure monitoring (latest ring)
- Health data synchronization with Apple Health
- Step counting integration
- Health report generation
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The application is used in conjunction with circul + to help monitor peripheral oxygen saturation, heart rate, etc., and generate health reports and analysis. Function: 1. Applications can easily connect circul + via Bluetooth. 2. Turn on daily monitoring, operation monitoring and sleep monitoring. The latest ring can monitor blood pressure; Tap to turn monitoring on / off and automatically generate reports. 3. Oxygen saturation, sleep, body temperature, heart rate variability (SDNN), diastolic blood pressure, systolic blood pressure, resting heart rate and heart rate data generated by circul+ ring will be saved to apple health in time. Daily step counting supports access to apple health data, and the source of steps can be switched between ring and apple health. 4. Before making any medical decision, please consult your doctor for advice in addition to using this application.
Letterly
Instantly transform your speech into polished text for notes, messages, social media, and more. Organize with custom tags, use offline, and choose from over 25 rewrite styles. Supports over 90 languages and syncs across all your devices.
- Speech to text transcription
- Customizable text rewriting
- Note organization with tags
- Offline recording
- Multi-language support
- Cross-device syncing
- Audio file upload transcription
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Turn your speech into brilliant text – instantly. Write anything, anytime. Perfect for notes, messages, emails, meeting summaries, journal entries, social media posts, and much more. Find your own unique use case! HOW IT WORKS This isn’t just a transcription tool. Just record any speech, and get polished, ready-to-use text immediately. USE CASES - Note-taking: ideas, to-dos, shopping lists, plans - Communication: messages, emails, comments - Content creation: social media posts, articles, newsletters, scripts - Journaling: thoughts, emotions, memories, gratitude - Meetings: summaries, minutes, action plans USEFUL FEATURES - Tags: organize notes with custom tags for easy navigation - Offline mode: capture thoughts anytime, even without internet - Any device: iPhone, Web, Mac, or iPad – notes stay synced across all platforms - Rewrite options: choose from 25+ premade rewrite styles or create your own - 90+ languages: speak freely – language is detected automatically - Widget: start recording instantly from your home screen - Translate: convert voice notes to any language in seconds - Quick sharing: send your text anywhere via Share button or integrations like Zapier - Audio upload: transcribe recordings made outside the app - Long recordings: record up to 90 minutes per note with unlimited recordings Download and try it today! We’ve designed the app to be simple, intuitive, and perfect for daily use. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula
Screenshots
Verdict
The clearest difference is review sentiment: Letterly at 78% against CIRCUL+'s 24%. Letterly also leads on rating (4.7 vs 3.3) and update cadence (every 10 days vs every 5 weeks). CIRCUL+'s advantage is in-app purchases (none vs 9) and iOS requirement (12.0 vs 16.0). On price, ads and device support 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. Letterly sells 9 in-app purchases, starting at $19.99 per month. CIRCUL+ asks for nothing beyond the download.
Letterly holds the better App Store score, 4.7 against 3.3. That said, the two scores are not equally well evidenced: Letterly has 1.1K ratings behind it against 36, so its average is the more settled of the two. Written reviews point the same way: 24% of CIRCUL+'s written reviews are positive against 78% of Letterly's.
CIRCUL+ ships an update every 5 weeks, Letterly every 10 days. The most recent releases landed on October 2, 2026 and October 17, 2026 respectively.
| Parameter | CIRCUL+ | Letterly |
|---|---|---|
| Price | Free | Free |
| Rating | 3.3 (36 ratings) | 4.7 (1.1K ratings) — better |
| Positive reviews | 23.5% of reviews | 78.1% of reviews — better |
| Number of ratings | 36 | 1.1K — better |
| Update frequency | Every 5 weeks | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac, Apple Watch — better |
| Requires iOS | 12.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 157 MB | 95 MB |
| Age rating | 12+ | 4+ |
| Developer | BodiMetrics, LLC | Anton Lebedev |
Customer experience
CIRCUL+
Letterly
Bugs and requests
CIRCUL+
Not enough reviews yet to summarise bugs or requests.
Letterly
Reported bugs
3 issues- Login screen freezes
- Incompatible with older devices
- When I get phone calls, I lose the entire recording
Requested features
3 requests- Dark mode option
- Advanced analytics dashboard
- Ability to use the artificial intelligence to search through all of my old notes for similar topics or keywords
In-app purchases
CIRCUL+
No in-app purchases
Letterly
- PRO Subscription (1 month)$19.991 Month
- PRO Subscription (3 months)$44.903 Months
- PRO Subscription (1 Year)7 Days trial$69.991 Year
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- PRO Subscription (1 Year)7 Days trial$79.991 Year
- PRO Subscription (1 Year)7 Days trial$89.991 Year
- PRO Subscription (12 months)7 Days trial$99.991 Year
- PRO Subscription (12 months)14 Days trial$99.991 Year
- PRO Subscription (Lifetime)$199.99
- PRO Subscription (Lifetime)$249.99
