Calipers Tape Measure vs Spool Tracker
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 5-meter tape measure
- Precision caliper mode
- Measure to 0.1mm accuracy
- Spirit level functionality
- Accurate measurement testing
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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.
Spool Tracker
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Know exactly how much filament you have — and what each print costs. SpoolVault is a filament tracker built for 3D printing, helping you track filament usage, monitor remaining spool weight, calculate print costs, and manage your filament inventory with precision. No more guessing. No more wondering what’s left. No more losing track of how much filament your prints actually use. SpoolVault is designed to make filament tracking fast, accurate, and practical: - Accurate spool weight tracking Know exactly how much filament is left on every spool, using preloaded, brand-specific spool weights for precise remaining-weight calculations. - Print cost tracking Add your filament prices and SpoolVault estimates the material cost of every print from the grams used — so you finally know what each print really costs. - Fast inventory setup Load your collection in minutes from a preloaded catalogue of brands, materials, and colours — Bambu Lab, eSun, Polymaker, Hatchbox, Overture, Inland, Prusament, Sunlu, and more — or add your own. Then organise by printer, AMS / multi-material slot, and storage location, with custom spool weights to match your setup. - Print Projects Group multiple plate prints under a named project to see total filament used, estimated material cost, and a full filament breakdown in one place. Core Features: • Track remaining filament weight per spool • Log filament usage after every print • Calculate filament cost per print • See what’s left before starting your next print • Manage active spools and sealed spools • Organise filament by printer, AMS / multi-material slots, and storage location • Customise brands, colours, and spool weights to match your setup • Search, sort, and filter your filament collection Built for serious makers who want precision, not guesswork. Know your filament. Track your costs. Print with confidence.
Screenshots
Verdict
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). Calipers Tape Measure's advantage is in-app purchases (none vs 2). On ads, device support 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
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.
Calipers Tape Measure ships an update every 3 months, Spool Tracker fortnightly. The most recent releases landed on September 29, 2026 and September 13, 2026 respectively.
| Parameter | Calipers Tape Measure | Spool Tracker |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.3 (26 ratings) — better | — |
| Positive reviews | 77.8% of reviews | — |
| Number of ratings | 26 — better | — |
| Update frequency | Every 3 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 6 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | Jacob Parker | Three19 Pty Ltd |
In-app purchases
Calipers Tape Measure
No in-app purchases
Spool Tracker
- SpoolVault Premium$4.991 Month
- SpoolVault Premium$49.991 Year
Questions
Is Calipers Tape Measure free?
Is Spool Tracker free?
Do Calipers Tape Measure or Spool Tracker have ads?
Which is updated more often, Calipers Tape Measure or Spool Tracker?
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