# OB Calc (cloud) vs AIm

OB Calc (cloud) and AIm both sit at 5.0 stars, but that hides the real split: 100% of AIm's written reviews are positive against 0% of OB Calc (cloud)'s. AIm also leads on update cadence (every 4 days vs every 3 months) and iOS requirement (16.4 vs 18.0). OB Calc (cloud)'s advantage is ratings volume (5 vs 1). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. OB Calc (cloud) sells 2 in-app purchases, starting at $2.99 per month and AIm sells 10 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for OB Calc (cloud) against 5.0 for AIm. That said, the two scores are not equally well evidenced: OB Calc (cloud) has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 0% of OB Calc (cloud)'s written reviews are positive against 100% of AIm's.

OB Calc (cloud) ships an update every 3 months, AIm every 4 days. The most recent releases landed on November 11, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | OB Calc (cloud) | AIm |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (5 ratings)](https://appshunter.io/ios/app/ob-calc-cloud/id1495610465/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/aim-pg/id6776292135/reviews) |
| Number of ratings | **5** | 1 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 14 MB | 62 MB |
| Requires iOS | 18.0 | **16.4** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Glen Botha](https://appshunter.io/developer/943181947) | [Akhil Sai Kumar Goud Karnati](https://appshunter.io/developer/1863101546) |

## What reviewers say

### OB Calc (cloud)

[App page](https://appshunter.io/ios/app/ob-calc-cloud/id1495610465)

This medical app helps obstetricians efficiently calculate key patient test date windows. It offers multiple calculation methods and allows for saving patient data and generating PDF reports. A free trial is available, followed by a subscription for full access.

**Highlights:** LMP, EDC, Ultrasound, CRL, and IVF calculations, Customizable test date ranges, Cross-device data syncing, PDF report generation, Save individual patient data

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $2.99 | per month |
| Premium (Annual) | $29.99 | per year |


### AIm

[App page](https://appshunter.io/ios/app/aim-pg/id6776292135)

This app helps you prepare for medical entrance exams by providing adaptive daily schedules, a question bank with detailed rationales, and AI-generated mock exams. It focuses on teaching you to think critically and identify why answers are correct or incorrect.

**Highlights:** Adaptive daily scheduling, Previous year question bank, Detailed answer rationales, AI-generated mock exams, Conceptual twist questions, Performance analytics

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Synapse Monthly | $0.99 | per month |
| Pro Monthly | $3.99 | per month |
| Synapse 6-Month | $4.99 | per 6 months |
| Pro+ Monthly | $5.99 | per month |
| Synapse Annual | $7.99 | per year |
| Pro 6-Month | $12.99 | per 6 months |
| Pro Annual | $19.99 | per year |
| Synapse 30-Day Exam Extension | $0.99 | one-time |
| Pro 30-Day Exam Extension | $0.99 | one-time |
| Pro+ 30-Day Exam Extension | $1.99 | one-time |


## Frequently asked questions

### Is OB Calc (cloud) free?

OB Calc (cloud) is free to download, with in-app purchases available.

### Is AIm free?

AIm is free to download, with in-app purchases available.

### Which has better reviews, OB Calc (cloud) or AIm?

OB Calc (cloud) and AIm are both rated 5.0 out of 5 on the App Store, from 5 and 1 ratings respectively.

### Do OB Calc (cloud) or AIm have ads?

Neither OB Calc (cloud) nor AIm shows ads.

### Which is updated more often, OB Calc (cloud) or AIm?

OB Calc (cloud) ships an update every 3 months, and AIm every 4 days. Most recently, OB Calc (cloud) was updated on November 11, 2026 and AIm on November 12, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*