Comparison

Bark vs PD Meter

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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/

About

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.

Highlights
  • AI-powered binocular interpupillary measurement
  • Contactless measurement method
  • High accuracy (0.1mm)
  • Manual error correction
  • Supports FPD and NPD measurements
Features
Read full description

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

Bark3 screens
PD Meter3 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Bark ships an update every 3 weeks, PD Meter monthly. The most recent releases landed on October 14, 2026 and October 5, 2026 respectively.

Scorecard6 real differences · 4 level
Bark versus PD Meter: the parameters behind the verdict, then further details
ParameterBarkPD Meter
PriceFreeFree
Rating4.9 (109 ratings) — better2.0 (4 ratings)
Positive reviews98.4% of reviews — better25.0% of reviews
Number of ratings109 — better4
Update frequencyEvery 3 weeks — betterMonthly
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.011.0 — better
Further details — not scored
Size32 MB93 MB
Age rating4+4+
Developer丰 黄杭州美戴科技有限公司

Customer experience

Bark

All ratings109 ratings
Positive97.2%
Neutral0.0%
Negative2.8%
Written reviews61 reviews
Positive98.4%
Neutral1.6%
Negative0.0%

PD Meter

All ratings4 ratings
Positive25.0%
Neutral0.0%
Negative75.0%
Written reviews4 reviews
Positive25.0%
Neutral0.0%
Negative75.0%

In-app purchases

2 purchases

Bark

Subscriptions1
  • Continuous support$2.691 Year
One-time1
  • One-time donation$2.69
None

PD Meter

No in-app purchases

Questions

Is Bark free?
Bark is free to download, with in-app purchases available.
Is PD Meter free?
PD Meter is free to download, with no in-app purchases.
Which has better reviews, Bark or PD Meter?
Bark is rated higher. Bark averages 4.9 out of 5 from 109 ratings, while PD Meter averages 2.0 from 4 ratings.
Do Bark or PD Meter have ads?
Neither Bark nor PD Meter shows ads.
Which is updated more often, Bark or PD Meter?
Bark ships an update every 3 weeks, and PD Meter monthly. Most recently, Bark was updated on October 14, 2026 and PD Meter on October 5, 2026.

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