Comparison

Calipers Tape Measure vs Spool Tracker

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

Head to head
About

Calipers Tape Measure

Measure objects of any size with your phone. Features a 5-meter tape measure for larger items and a precision caliper mode for measuring small objects down to a tenth of a millimeter. Offers highly accurate readings tested across various devices and settings.

Highlights
  • 5-meter tape measure
  • Precision caliper mode
  • Measure to 0.1mm accuracy
  • Spirit level functionality
  • Accurate measurement testing
Read full description

Calipers lets you take measurements when you're on the go. For the big things, there's 5 meter tape measure. Simply place your iPhone on a surface so the ‘zero’ aligns with where you want to start your measurement. Next, place a finger near the bottom of your iPhone and slide your iPhone along the surface, keeping your finger still. Finally, when your finger reaches the top, repeat the process again until you’ve completed your measurement For the little things, the calipers mode will let you measure objects within a tenth of a millimeter. Simply place an object on the screen, and drag the top and bottom guides until they are just visible. To get really accurate readings, you can use the ‘plus’ and ‘minus’ buttons to move the guides closer or further apart by a 1/10th of a millimeter. 6 out of the top 10 free apps in this category are off by as much as 10% on the iPhone 12 & 13 Mini, or when some accessibility features are enabled. Since most people don't check their app against a ruler - we felt it was really important we did! This app has been throughly tested to ensure the measurements are accurate in every scenario.

About

Spool Tracker

Features
Read full description

Know exactly how much filament you have — and what every print costs. Add your whole shelf in minutes, then stop guessing for good. SpoolVault is a filament inventory built for 3D printing. Weigh a spool, log a print, and you always know what's left, what it cost, and which printer or shelf it's sitting on. ADD YOUR WHOLE SHELF IN MINUTES Pick a brand and a material, tap every color you own, set how many of each, and save them all in one go. Then do the same for your next brand. Brands, materials and colors come preloaded for Bambu Lab, eSUN, Polymaker, Prusament, Hatchbox, Overture, Inland, Sunlu, Elegoo and BIQU. KNOW WHAT'S LEFT ON EVERY SPOOL Put a spool on any kitchen scale and enter the number. SpoolVault subtracts the empty spool's weight and tells you the filament remaining. Brand-specific spool weights are already built in, so it's a real figure, not a guess. KNOW WHAT EVERY PRINT COSTS Enter what you paid for a spool and SpoolVault works out the material cost of every print from the grams used — so you finally know what the thing you just made actually cost. KNOW WHERE EVERY SPOOL IS Assign spools to a printer, an AMS or multi-material slot, and a storage location — drybox, shelf, cupboard, wherever they really live. Then find any color in seconds. GROUP A BUILD INTO A PROJECT Multi-plate print? Group the plates under one named project and see total filament used, estimated material cost, and a full breakdown of every spool that went into it. Also in the app: • Opened and unopened spools, tracked separately • Full weight history for every spool, so you can watch it come down • Search, sort and filter your whole collection • Custom brands, colors and spool weights • Saved spool-weight defaults for the spools you reuse • Export a backup of your inventory any time • No account, no sign-in — your inventory lives on your device • Works offline, in the workshop, with no signal • No ads • Free for 30 days — no subscription starts, nothing to cancel Know what's on the shelf. Know what it cost. Get back to printing. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.spoolvault.com/privacy-policy.html

Screenshots

Calipers Tape Measure4 screens
Spool Tracker4 screens

Verdict

The call

The clearest difference is price: Spool Tracker at Free against Calipers Tape Measure's $1.99. Spool Tracker also leads on update cadence (fortnightly vs every 3 months) and iOS requirement (15.0 vs 17.0). Calipers Tape Measure's advantage is in-app purchases (none vs 2). On 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

Spool Tracker is free to download; Calipers Tape Measure costs $1.99 up front. Spool Tracker sells 2 in-app purchases, starting at $4.99 per month. Calipers Tape Measure asks for nothing beyond the download.

UpkeepUpdate frequency

Calipers Tape Measure ships an update every 3 months, Spool Tracker fortnightly. The most recent releases landed on October 15, 2026 and October 1, 2026 respectively.

Scorecard4 real differences · 6 level
Calipers Tape Measure versus Spool Tracker: the parameters behind the verdict, then further details
ParameterCalipers Tape MeasureSpool Tracker
Price$1.99Free — better
Rating4.3 (26 ratings) — better—
Positive reviews77.8% of reviews—
Number of ratings26 — better—
Update frequencyEvery 3 monthsFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.0 — better
Further details — not scored
Size6 MB36 MB
Age rating4+4+
DeveloperJacob ParkerThree19 Pty Ltd

In-app purchases

None

Calipers Tape Measure

No in-app purchases

2 purchases

Spool Tracker

Subscriptions2
  • SpoolVault Premium$4.991 Month
  • SpoolVault Premium$49.991 Year

Questions

Is Calipers Tape Measure free?
Calipers Tape Measure costs $1.99, with no in-app purchases.
Is Spool Tracker free?
Spool Tracker is free to download, with in-app purchases available.
Do Calipers Tape Measure or Spool Tracker have ads?
Neither Calipers Tape Measure nor Spool Tracker shows ads.
Which is updated more often, Calipers Tape Measure or Spool Tracker?
Calipers Tape Measure ships an update every 3 months, and Spool Tracker fortnightly. Most recently, Calipers Tape Measure was updated on October 15, 2026 and Spool Tracker on October 1, 2026.

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