Bark vs PD Meter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Bark
Send custom push notifications to your iPhone via an HTTP API. Supports advanced features like custom icons, grouping, and critical alerts. Offers privacy-protected, end-to-end encrypted pushes with self-deployable server options.
- HTTP API for push notifications
- Custom icons and grouping
- Continuous and critical alerts
- End-to-end push encryption
- Self-deployable server options
- Privacy-protected notifications
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You can send push notifications to your iPhone by simply calling an HTTP API. Bark supports many advanced iOS push features, such as custom icons, notification grouping, custom ringtones, continuous alerts, critical alerts, and encrypted pushes. Bark does not consume device battery, as its core functionality relies on system push services and push extensions, and the app itself does not need to be running. Bark ensures your privacy and security with high reliability. Bark supports self-deploying the server, which can be deployed via Docker, Serverless, or Cloudflare Worker. The bark-server supports most operating systems, and you can also run it manually. The app is compiled and uploaded through Github Action, ensuring that the version you’re using is compiled from open-source code, without any modifications by anyone (including the author). Bark supports end-to-end push encryption with a custom key, ensuring that the push content is not accessed or leaked by the Bark server or Apple’s APNs server during transmission. The notification message history saved locally by Bark is also very secure. Using the NotificationServiceExtension, the push message is only stored on the device when the push is received. Feedback email: to@day.app Privacy Policy: https://api.day.app/privacy User Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
PD Meter
This application uses AI technology to measure interpupillary distance accurately. It offers a contactless method for measurement, avoiding close proximity required by traditional devices. Users can manually correct any AI recognition errors for precise results.
- AI-powered binocular interpupillary measurement
- Contactless measurement method
- High accuracy (0.1mm)
- Manual error correction
- Supports FPD and NPD measurements
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MEIDAI Interpupillometer is the world's first app which using AI technology for binocular interpupillary measurement. Using it can avoid the risk that traditional handheld interpupillometers requiring doctors and users facing each other in a extreme close distance (approximately 20cm). [Accuracy] 0.1mm [Result error] 0.3-0.5mm [Tips for use] For FPD measurement, focus at least 4 meters away. For NPD measurement, please follow the "distance reminder". [Steps] (1) Adjusting the face to the camera (2) Keep your face steady when prompted (3) Focus distance required to adjust sight * Use interpupillary distance for distance, look beyond the "tip arrow" to see the distance * Close to interpupillary distance, focus on "tip arrow" camera (4)) Click [Measure] to get interpupillary results (5) The errors in AI's pupil recognition can be corrected manually. For further technical support from professional organizations, please contact us: WeChat: 13957778558 Email: support@meidaitech.com Official Website: https://www.meidaitech.com
Screenshots
Verdict
The clearest difference is review sentiment: Bark at 98% against PD Meter's 25%. Bark also leads on rating (4.9 vs 2.0) and ratings volume (109 vs 4). PD Meter's advantage is in-app purchases (none vs 2) and iOS requirement (11.0 vs 15.0). On price, update cadence, 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. Bark sells 2 in-app purchases, starting at $2.69 per year. PD Meter asks for nothing beyond the download.
Bark holds the better App Store score, 4.9 against 2.0. That said, the two scores are not equally well evidenced: Bark has 109 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 98% of Bark's written reviews are positive against 25% of PD Meter's.
Bark ships an update every 3 weeks, PD Meter monthly. The most recent releases landed on October 14, 2026 and October 5, 2026 respectively.
| Parameter | Bark | PD Meter |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (109 ratings) — better | 2.0 (4 ratings) |
| Positive reviews | 98.4% of reviews — better | 25.0% of reviews |
| Number of ratings | 109 — better | 4 |
| Update frequency | Every 3 weeks — better | Monthly |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 32 MB | 93 MB |
| Age rating | 4+ | 4+ |
| Developer | 丰 黄 | 杭州美戴科技有限公司 |
Customer experience
Bark
PD Meter
In-app purchases
Bark
- Continuous support$2.691 Year
- One-time donation$2.69
PD Meter
No in-app purchases









