PPI Guru vs Hololink
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PPI Guru
Easily calculate the Pixels Per Inch (PPI) for any screen, from phones to monitors. Input screen dimensions and diagonal size to get an instant PPI result and determine if it qualifies as a Retina Display. You can also search for device information online and save your calculations.
- Automatic PPI calculation
- Search device information online
- Retina Display indicator
- Save device information locally
- Supports phones, tablets, laptops, and monitors
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PPI Guru is utility to calculate display's PPI (Pixels Per Inch) of Phones, Pads or Laptops, even Monitors. For calculating PPI of specified display, just input screen width, height in pixels and diagonal size of the screen in inches, the PPI will be auto calculated and show in result. And it will indicate that display is or not a Retina Display. (Retina Display means (size greater or equal than 10″ and PPI greater or equal than 200) or (size less than 10″ and PPI greater or equal than 300)). Key Features: • Calculating PPI automatic • Search device information from internet • Retina Display indicator • Save device information For public sale devices, you can just enter device name, then press Search Info, PPI Guru will search that name with Google, then grab display's information of that device. PS. Search Info may not return accurate information, and it depends on accessibility to Google. Device's information could be saved in local database for further reference.
Hololink
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Hololink is a free app that can stream your desktop games to your cellphone. Hololink support bluetooth keyboard mouse and bluetooth gamepad. After your computer and cellphone paired successfully, you can enjoy your PC Games on your cellphone with Hololink. Please note that when you add devices, the WLAN IP you entered is your computer’s WLAN IP, not your cellphone's Requirements: * Your cellphone and your computer need to be connected to the same local network * Your computer graphics card needs to be an NVIDIA graphics card * You need to download Gefroce Experience on your computer
Screenshots
Verdict
The clearest difference is ads: PPI Guru at none against Hololink's shown. PPI Guru also leads on device support (5 vs 2). Hololink's advantage is update cadence (every 3 months vs every 10 months). On price, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
PPI Guru ships an update every 10 months, Hololink every 3 months. The most recent releases landed on November 11, 2026 and November 7, 2026 respectively.
| Parameter | PPI Guru | Hololink |
|---|---|---|
| Price | Free | Free |
| Rating | 3.4 (7 ratings) — better | — |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 7 — better | — |
| Update frequency | Every 10 months | Every 3 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod, Mac, Apple TV — better | iPhone, iPod |
| Requires iOS | 10.0 — better | 11.0 |
| Further details — not scored | ||
| Size | 32 MB | 55 MB |
| Age rating | 4+ | 4+ |
| Developer | 基伟 徐 | 蔚 季 |
In-app purchases
PPI Guru
No in-app purchases
Hololink
No in-app purchases
