Best First Due Size Up Apps

36+ iOS apps curated and reviewed

4.0 avg rating
20 free apps
Updated November 2026

The best first due size up apps on iPhone average 4.0β˜… across 36+ titles β€” we've ranked them by what real users actually keep on their phones. Updated November 2026.

Compare top First Due Size Up Apps (November 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1First Due MobileFirst Due MobileFree2.8β˜… (869)NoNoNov 2026
2How Big Now: Baby Size TrackerHow Big Now: Baby Size TrackerFreeβ€”NoYesOct 2026
3First DueFirst DueFreeβ€”NoNoAug 2026
4First Due Mobile - FedRAMPFirst Due Mobile - FedRAMPFree1.6β˜… (10)NoNoNov 2026
5Microsoft AuthenticatorMicrosoft AuthenticatorFree4.7β˜… (724K)NoNoNov 2026
6Canvas by InstructureCanvas by InstructureFree4.7β˜… (2.8M)NoNoNov 2026
7Size Guide Builder | VestofySize Guide Builder | VestofyFree3.9β˜… (7)NoYesOct 2026
8Kalma: Pregnancy Tracker & AIKalma: Pregnancy Tracker & AIFreeβ€”NoYesNov 2026

Top Picks for First Due Size Up

First Due Mobile#1

First Due Mobile by Locality Media, Inc.

For a safer & faster response
Editor's Choice
πŸ“Š Productivity
2.8😐(869 ratings)
Free
First Due Mobile screenshot 1
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This app provides real-time incident tracking, emergency routing, and detailed building pre-plans for first responders. It offers quick scene size-ups, integrated data, and team communication features for safer and faster responses.

What We Love

  • πŸš€ Accurate incident information
  • πŸ“Š Valuable pre-planning and response data
  • πŸ—ΊοΈ Helpful mapping and navigation features
  • πŸ’‘ Comprehensive all-in-one solution

Room to Improve

  • πŸ› Frequent crashes and stability issues
  • πŸ“± Clunky and unintuitive mobile interface
  • ⏱️ Slow incident notifications and app loading
  • πŸ”‡ Lack of customizable alert tones and settings
  • 🀯 Overwhelming number of features, poor usability

More First Due Size Up apps to explore

FAQ about First Due Size Up

What are the best first due size up apps for iPhone?
First Due Mobile tops our first due size up apps ranking as of November 2026, with a 2.8-star average from 869 App Store ratings, and it's free to download.
Yes β€” 20 of the top first due size up apps we rank are free to download, including First Due Mobile and How Big Now: Baby Size Tracker.
First Due Mobile has no ads and has no in-app purchases, according to its App Store listing as of November 2026.
We track 36+ first due size up apps on the iOS App Store as of November 2026, ranked by rating, recency, and analysis of real user reviews.