Comparison

i vs Tumbler Timer Pro

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

Head to head
About

i

Transform your smartphone into a powerful magnification tool. Observe and record microscopic details with your phone's camera and a macro lens. Measure objects with a scale bar and add notes to your digital micrographs.

Highlights
  • Professional magnification tool
  • Record digital micrographs
  • Optical magnification
  • Up to 10x digital zoom
  • Scale bar for measurement
  • Add notes and remarks
  • Direct photo sharing
Features
Read full description

Use this app to work with smartphone microscopes or any phone macro-lens as an professional magnification tool to observe tiny objects and record digital micrographs with your Phone. Features: Capture of photos with tiny objects as you do with sophisticated optical microscope Optical magnification ratio depending on your smartphone microscope Up to 10x digital magnification in App Scale bar for objects measurement which can be toggled on/off Automatic recording of shooting date and time Allow you to add notes and remarks to your picture Direct sharing of photos with email, message. Attach smartphone microscope to your Phone and convert it into a convenient portable microscope. Capture and save micrographs. Zoom in on photos and tag pictures with comments. Access your photos from your i-Seeing app, email them to your computer and colleagues. More detail at: www.mobile-scope.com

About

Tumbler Timer Pro

This app helps rock tumbling enthusiasts manage their batches from start to finish. It allows users to track progress, set custom durations, and receive notifications for stage completion. Includes a rock identification guide and lifetime statistics.

Highlights
  • Smart batch tracking
  • Flexible stage management
  • Multi-tumbler support
  • Stage completion notifications
  • Rock identification guide
  • Lifetime statistics tracking
Features
Read full description

Tumbler Timer Pro is the essential companion app for rock tumbling enthusiasts. Whether you're a beginner polishing your first agates or an experienced lapidary running multiple tumblers, this app keeps your batches on track from rough rock to brilliant gemstone. SMART BATCH TRACKING • Create and manage multiple batches simultaneously • Track progress through each tumbling stage with visual indicators • Set custom stage durations from hours to weeks • Add notes and photos to document your journey • Rate finished batches and track your success over time FLEXIBLE STAGE MANAGEMENT • Choose from preset recipes (3-step, 4-step, 5-step) • Create unlimited custom recipes for different rock types • Configure default grit stages to match your preferred workflow • Adjust stage durations on the fly as needed MULTI-TUMBLER SUPPORT • Add all your tumblers - rotary, vibratory, or both • Assign batches to specific tumblers • See at a glance which tumblers are running and which are available • Track maintenance and usage for each machine STAY INFORMED • Get notified when stages complete - never miss a grit change • Set quiet hours so notifications respect your schedule • Optional daily check reminders to inspect your batches • Early warning alerts before stage completion ROCK IDENTIFICATION GUIDE • Built-in reference guide for common tumbling rocks • Mohs hardness ratings and tumbling tips for each stone • Interactive Rock ID Wizard to help identify unknown specimens • Learn which rocks tumble well together TRACK YOUR PROGRESS • View lifetime statistics - batches completed, hours tumbled, rocks polished • Unlock achievements as you reach milestones • Monitor your current and longest tumbling streaks • See your average batch success ratings DESIGNED FOR ALL DEVICES • Beautiful dark interface that's easy on the eyes • Optimized for both iPhone and iPad • Works great on all screen sizes Whether you're tumbling Lake Superior agates, beach jasper, or backyard finds, Tumbler Timer Pro helps you achieve that perfect polish every time. Download now and start your next batch!

Screenshots

i3 screens
Tumbler Timer Pro4 screens

Verdict

The call

The clearest difference is price: i at Free against Tumbler Timer Pro's $0.99. i also leads on ratings volume (35 vs 1) and iOS requirement (16.0 vs 26.0). Tumbler Timer Pro's advantage is rating (5.0 vs 2.7) and update cadence (every 2 weeks vs every 14 months). On 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

CostPrice · In-app purchases · Ads · Monetization

i is free to download; Tumbler Timer Pro costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Tumbler Timer Pro holds the better App Store score, 5.0 against 2.7. That said, the two scores are not equally well evidenced: i has 35 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

i ships an update every 14 months, Tumbler Timer Pro every 2 weeks. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

Scorecard6 real differences · 4 level
i versus Tumbler Timer Pro: the parameters behind the verdict, then further details
ParameteriTumbler Timer Pro
PriceFree — better$0.99
Rating2.7 (35 ratings)5.0 (1 ratings) — better
Positive reviews20.0% of reviews—
Number of ratings35 — better1
Update frequencyEvery 14 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPodiPhone, iPad
Requires iOS16.0 — better26.0
Further details — not scored
Size6 MB8 MB
Age rating4+4+
DeveloperShanghai Qingying Electronic Technology LLCScott Manley

Customer experience

i

All ratings34 ratings
Positive38.2%
Neutral8.8%
Negative52.9%
Written reviews25 reviews
Positive20.0%
Neutral8.0%
Negative72.0%

Tumbler Timer Pro

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

i

No in-app purchases

None

Tumbler Timer Pro

No in-app purchases

Questions

Is i free?
i is free to download, with no in-app purchases.
Is Tumbler Timer Pro free?
Tumbler Timer Pro costs $0.99, with no in-app purchases.
Which has better reviews, i or Tumbler Timer Pro?
Tumbler Timer Pro is rated higher. i averages 2.7 out of 5 from 35 ratings, while Tumbler Timer Pro averages 5.0 from 1 ratings.
Do i or Tumbler Timer Pro have ads?
Neither i nor Tumbler Timer Pro shows ads.
Which is updated more often, i or Tumbler Timer Pro?
i ships an update every 14 months, and Tumbler Timer Pro every 2 weeks. Most recently, i was updated on November 1, 2026 and Tumbler Timer Pro on October 31, 2026.

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