i vs Ruler
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
i
Transform your microscope into a digital one using your phone and a special adapter. Capture images with embedded scale bars and annotations, then easily share them with others.
- Capture digital micrographs
- Support magnification up to 5 objectives
- Scale-bar embedding and calibration
- Stamp remarks, date/time, magnification
- Direct email and message sharing
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Description: Attach your phone with iADAPTER to your microscope and convert it into a digital microscope with i-Scale. It enables you to take digital micrographs with scale-bar embedded and remarks added. In addition, you can easily share micrographs with other and people. Features: Capture digital micrographs support magnification up to 5 objectives Scale-bar embedding and calibration Remarks, date/time, and magnification ratio can be stamped on picture Direct email, message sharing of picture with others More detail at: www.mobile-scope.com
Ruler
This utility app uses augmented reality to measure the length and area of real-world objects using your smartphone's camera. It offers unlimited measurements and an ad-free experience with premium subscriptions.
- Augmented reality measurement
- Measure length and area
- High precision with AR Kit
- Unlimited measurements (premium)
- Ad-free experience (premium)
- Subscription options available
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Ruler is the easiest and most accurate based on augmented reality. The app uses augmented reality technology(AR) to measure the real world object's area and length with your smartphone's camera. We have constantly improved this app since AR Kit was released which ensure the highest precision. Premium Services 1. Unlimited length Measurement. 2. Unlimited Area Measurement. 3. No Annoying ads. * Subscription is available like any ruler app. The payments will be charged to your iTunes account at confirmation of your purchase. * Subscription automatically renews for the same price and duration period as the original “one week”/”one month”/ unless auto-renew is turned off at least 24-hours before the end of the current period Our Standard Subscriptions are: 1. A one-week auto-renewal subscription with a 3-day trial period. 2. A one-month auto-renewal subscription with a 3-day trial period. Privacy Policy: https://sites.google.com/view/rulerios/terms-condition/privacy-policy Terms of Use: https://sites.google.com/view/rulerios/terms-condition
Screenshots
Verdict
The clearest difference is rating: Ruler at 4.3 against i's 2.4. Ruler also leads on ratings volume (133 vs 14) and iOS requirement (11.0 vs 16.0). i's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price, update cadence 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
Both are free to download. Ruler sells 2 in-app purchases, starting at $1.99 per 7 days. i asks for nothing beyond the download.
Ruler holds the better App Store score, 4.3 against 2.4. That said, the two scores are not equally well evidenced: Ruler has 133 ratings behind it against 14, so its average is the more settled of the two. Written reviews complicate that: 50% of i's written reviews are positive against 33% of Ruler's, so the app with the better star average is not the one people write more warmly about.
i ships an update every 14 months, Ruler every 7 months. The most recent releases landed on June 1, 2026 and August 20, 2026 respectively.
| Parameter | i | Ruler |
|---|---|---|
| Price | Free | Free |
| Rating | 2.4 (14 ratings) | 4.3 (133 ratings) — better |
| Positive reviews | 50.0% of reviews — better | 33.3% of reviews |
| Number of ratings | 14 | 133 — better |
| Update frequency | Every 14 months | Every 7 months — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | Shanghai Qingying Electronic Technology LLC | MD KHAIRUL ISLAM |
Customer experience
i
Ruler
In-app purchases
i
No in-app purchases
Ruler
- Ruler Premium Weekly3 Days trial$1.997 Days
- Ruler Monthly Premium3 Days trial$5.991 Month
Questions
Is i free?
Is Ruler free?
Which has better reviews, i or Ruler?
Do i or Ruler have ads?
Which is updated more often, i or Ruler?
Other comparisons
