# Inference Ace vs BDI

The clearest difference is rating: Inference Ace at 3.5 against BDI's 2.3. Inference Ace also leads on device support (3 vs 1) and ratings volume (22 vs 6). BDI's advantage is in-app purchases (none vs 3) and update cadence (every 2 months vs every 7 months). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Inference Ace sells 3 one-off in-app purchases. BDI asks for nothing beyond the download.

Inference Ace holds the better App Store score, 3.5 against 2.3. Both are backed by a comparable volume of ratings — 22 and 6 respectively.

Inference Ace ships an update every 7 months, BDI every 2 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Inference Ace | BDI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.5 (22 ratings)](https://appshunter.io/ios/app/inference-ace/id866920724/reviews)** | [2.3 (6 ratings)](https://appshunter.io/ios/app/bdi-3-mobile-data-solution/id1532433975/reviews) |
| Number of ratings | **22** | 6 |
| Positive reviews | 88.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 22 MB | 208 MB |
| Requires iOS | **12.2** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Janine Toole](https://appshunter.io/developer/839832427) | [RiversideInsights](https://appshunter.io/developer/1483738140) |

## What reviewers say

### Inference Ace

[App page](https://appshunter.io/ios/app/inference-ace/id866920724)

This app helps children in grades 2-5 improve their reading comprehension by teaching inference skills step-by-step. It uses a game-like environment with over 450 examples and a reward center to keep kids engaged. Detailed reporting is available for up to 10 students.

**Highlights:** Step-by-step inference skill building, Game-like environment with reward center, Over 450 examples designed by teachers, Detailed reporting for multiple students, Incremental learning with unlocked levels, Guided learning for reduced frustration

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to 2 Players | $1.99 | one-time |
| Inference Ace: Buy All Levels | $2.99 | one-time |
| Upgrade to 10 Players | $2.99 | one-time |


### BDI

[App page](https://appshunter.io/ios/app/bdi-3-mobile-data-solution/id1532433975)

This application assists in administering clinical assessments for child development. It offers guided digital support for scoring, timers, and reporting, functioning both online and offline. Users can manage student data and sync assessments for web-based access.

**Highlights:** Online and offline assessment administration, Guided digital scoring assistance, Basal and ceiling indicators, Built-in timers, Modular reporting options, Student data management

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Inference Ace free?

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

### Is BDI free?

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

### Which has better reviews, Inference Ace or BDI?

Inference Ace is rated higher. Inference Ace averages 3.5 out of 5 from 22 ratings, while BDI averages 2.3 from 6 ratings.

### Do Inference Ace or BDI have ads?

Neither Inference Ace nor BDI shows ads.

### Which is updated more often, Inference Ace or BDI?

Inference Ace ships an update every 7 months, and BDI every 2 months. Most recently, Inference Ace was updated on November 6, 2026 and BDI on November 3, 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.*