uSpectrum MK350S vs Doc Reader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
uSpectrum MK350S
This app provides advanced light analysis and efficient workflow features for lighting production. It offers remote control operations, data storage, and detailed light readings including BIN ranking and CRI.
- WiFi remote control
- SD card data storage
- Basic and advanced light analytics
- BIN ranking
- Log compare
- CRI (R1-R15)
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The MK350S is a lightweight, portable, easy-to-operate spectrometer with WiFi remote control operations and SD card data storage. This product has basic features for fast, easy lighting readings, as well as advanced light analytics, and efficient work-flow features for lighting production environments. Beyond MK350N, this App include BIN ranking, log compare, data checker and CRI (R1-R15). User can also customize basic list with different measurement terms.
Doc Reader
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Turn your PDFs and websites into a listening experience — in 41 languages. DocReader converts any PDF, website, or document into natural-sounding speech so you can absorb textbooks, research papers, lecture notes, and articles while commuting, exercising, or doing chores. Why students and academics love it: - Listen to any PDF from Safari, Mail, Files, or Google Drive - Natural-sounding voices in English, Spanish, French, German, Portuguese, Russian, Japanese, Chinese, Korean, Hindi, and Arabic - Adjustable speed from 0.5x to 2.0x — slow down for dense material or speed up for review - Keeps playing in the background — switch apps without losing your place 100% free. No catches: No subscriptions. No token limits. No "premium" tier. DocReader is completely free to use with no restrictions — today and always. Perfect for: - Reviewing lecture slides and course readings on your commute - Listening to research papers while at the gym - Turning long-form articles into audio during your morning routine - Making dense academic material easier to absorb through listening - Reading PDFs in your native language with a natural voice - Accessibility — hear any PDF read aloud with a natural voice Private by design: Everything runs on your device. Your documents never leave your phone. No accounts. No cloud processing. No data collection. How it works: 1. Open a PDF in DocReader from any app 2. Pick a voice — choose from multiple languages 3. Tap play 4. Listen
Screenshots
Verdict
The clearest difference is update cadence: Doc Reader at weekly against uSpectrum MK350S's every 2 months. uSpectrum MK350S's advantage is iOS requirement (6.0 vs 18.0). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
uSpectrum MK350S ships an update every 2 months, Doc Reader weekly. The most recent releases landed on October 4, 2026 and October 5, 2026 respectively.
| Parameter | uSpectrum MK350S | Doc Reader |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 6.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 54 MB | 651 MB |
| Age rating | 4+ | 4+ |
| Developer | United Power Research Technology Corporation | ETHAN SCOTT TROKIE |
In-app purchases
uSpectrum MK350S
No in-app purchases
Doc Reader
No in-app purchases
