# ProbSim vs InstantCert CLEP

The clearest difference is in-app purchases: ProbSim at none against InstantCert CLEP's 1. ProbSim also leads on iOS requirement (8.0 vs 15.1). InstantCert CLEP's advantage is update cadence (every 6 months vs every 40 months) and review sentiment (11% vs 0%). On price and ads there is nothing between them.

Both are free to download. InstantCert CLEP sells 1 in-app purchase, starting at $19.99 per month. ProbSim asks for nothing beyond the download.

ProbSim ships an update every 40 months, InstantCert CLEP every 6 months. The most recent releases landed on October 4, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | ProbSim | InstantCert CLEP |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | **11.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 40 months | **Every 6 months** |
| Monetization | **Free** | Subscription |
| Size | 29 MB | 38 MB |
| Requires iOS | **8.0** | 15.1 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Bretl](https://appshunter.io/developer/553850818) | [InstantCert.com, LLC](https://appshunter.io/developer/465309084) |

## What reviewers say

### ProbSim

[App page](https://appshunter.io/ios/app/probsim/id954912323)

Simulate probability experiments with various tools like coins, dice, and spinners. Test your predictions against experimental results and tackle challenging probability problems.

**Highlights:** Probability experiment simulation, Coin flipping, Dice rolling, Spinner manipulation, Marble drawing from urns, Predictive testing, Problem-solving challenges

**Features:** macOS Compatibility

**In-app purchases:** none


### InstantCert CLEP

[App page](https://appshunter.io/ios/app/instantcert-clep/id1238759723)

Prepare for college credit exams like CLEP and DSST with smart flashcards and progress tracking. Study over 60 subjects on your phone and connect with a community of learners. Earn college credit faster and save on tuition.

**Highlights:** Smart flashcards for memorization, Covers CLEP, DSST & TECEP subjects, Mobile study anywhere, Progress tracking, Community support, Over 60 exam subjects

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Access (1 Month) | $19.99 | per month |


## Frequently asked questions

### Is ProbSim free?

ProbSim is free to download, with no in-app purchases.

### Is InstantCert CLEP free?

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

### Do ProbSim or InstantCert CLEP have ads?

Neither ProbSim nor InstantCert CLEP shows ads.

### Which is updated more often, ProbSim or InstantCert CLEP?

ProbSim ships an update every 40 months, and InstantCert CLEP every 6 months. Most recently, ProbSim was updated on October 4, 2026 and InstantCert CLEP on September 25, 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.*