Comparison

uSpectrum MK350D vs Inbox Zero

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

Head to head
About

uSpectrum MK350D

This portable spectrometer offers easy-to-use lighting analysis for production environments. It features BLE remote control and SD card data storage for efficient workflow and advanced light analytics.

Highlights
  • BLE remote control
  • SD card data storage
  • Fast lighting readings
  • Advanced light analytics
  • Efficient workflow features
Features
Read full description

The MK350D is a lightweight, portable, easy-to-operate spectrometer with BLE 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.

About

Inbox Zero

This AI-powered assistant helps you manage your email inbox efficiently. It prioritizes important messages, drafts replies in your style, and helps you unsubscribe from unwanted newsletters. Automate email handling with custom rules and stay in control of your communications.

Highlights
  • Prioritize important emails
  • Draft AI-assisted replies
  • Unsubscribe from newsletters
  • Bulk archive emails
  • Create custom automation rules
  • Manage multiple Gmail accounts
Features
Read full description

Inbox Zero is a fast, native email app for Gmail and Outlook, with an AI assistant built in. FAST, EVEN OFFLINE Your mail is stored on your iPhone, so your inbox opens instantly and stays usable without a connection. Changes sync in the background. SPLIT INBOX Split your inbox into tabs for the mail you care about. Each tab shows its unread count, so you know where to look first. UNSUBSCRIBE IN SECONDS See who keeps emailing you and choose Keep, Auto-archive or Unsubscribe for each sender, one by one or in bulk. Unsubscribing is free. ASK AI Chat with the Inbox Zero assistant from your inbox or any email. Ask about your mail, or tell it how your email should be handled. NEVER MISS A REPLY Get a notification when an email needs your reply, and tap straight into the conversation. TRIAGE WITHOUT FRICTION Swipe to mark done or read, and jump straight to the next email after you archive. Mark a whole list done at once, and choose your own swipe actions. WRITE AND REPLY Reply inline with attachments, photos and dictation. Drafts show up in your list and open right where you left off. Schedule messages with Send later, and undo a send for 30 seconds. ALL YOUR ACCOUNTS Connect several Gmail and Outlook accounts and read them together or one at a time. BUILT FOR IPHONE A Liquid Glass design, emails that stay readable in dark mode, and remote images loaded through a privacy proxy. Inbox Zero requires a paid subscription. New users receive a 7-day free trial. Monthly and annual plans renew automatically unless canceled at least 24 hours before the end of the current billing period. Manage or cancel your subscription in your Apple ID account settings. Privacy Policy: https://www.getinboxzero.com/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

uSpectrum MK350D4 screens
Inbox Zero4 screens

Verdict

The call

The clearest difference is in-app purchases: uSpectrum MK350D at none against Inbox Zero's 2. uSpectrum MK350D also leads on iOS requirement (8.0 vs 18.0). Inbox Zero's advantage is update cadence (weekly vs every 2 months). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Inbox Zero sells 2 in-app purchases, starting at $19.99 per month. uSpectrum MK350D asks for nothing beyond the download.

UpkeepUpdate frequency

uSpectrum MK350D ships an update every 2 months, Inbox Zero weekly. Both last shipped on October 24, 2026.

Scorecard4 real differences · 6 level
uSpectrum MK350D versus Inbox Zero: the parameters behind the verdict, then further details
ParameteruSpectrum MK350DInbox Zero
PriceFreeFree
Rating3.0 (2 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 2 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS8.0 — better18.0
Further details — not scored
Size39 MB35 MB
Age rating4+4+
DeveloperUnited Power Research Technology CorporationInbox Zero Inc.

In-app purchases

None

uSpectrum MK350D

No in-app purchases

2 purchases

Inbox Zero

Subscriptions2
  • Inbox Zero Starter Monthly$19.991 Month
  • Inbox Zero Starter Annual$199.991 Year

Questions

Is uSpectrum MK350D free?
uSpectrum MK350D is free to download, with no in-app purchases.
Is Inbox Zero free?
Inbox Zero is free to download, with in-app purchases available.
Do uSpectrum MK350D or Inbox Zero have ads?
Neither uSpectrum MK350D nor Inbox Zero shows ads.
Which is updated more often, uSpectrum MK350D or Inbox Zero?
uSpectrum MK350D ships an update every 2 months, and Inbox Zero weekly. Most recently, uSpectrum MK350D was updated on October 24, 2026 and Inbox Zero on October 24, 2026.

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