# Symbol Overlay Maker vs BDI

The clearest difference is rating: BDI at 2.3 against Symbol Overlay Maker's 2.0. BDI also leads on update cadence (every 2 months vs every 6 months) and ratings volume (6 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

BDI holds the better App Store score, 2.3 against 2.0. Both are backed by a comparable volume of ratings — 2 and 6 respectively.

Symbol Overlay Maker ships an update every 6 months, BDI every 2 months. The most recent releases landed on September 23, 2026 and August 22, 2026 respectively.

## The numbers

| Metric | Symbol Overlay Maker | BDI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (2 ratings)](https://appshunter.io/ios/app/symbol-overlay-maker/id1510255596/reviews) | **[2.3 (6 ratings)](https://appshunter.io/ios/app/bdi-3-mobile-data-solution/id1532433975/reviews)** |
| Number of ratings | 2 | **6** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 142 MB | 208 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [AbleNet](https://appshunter.io/developer/390532170) | [RiversideInsights](https://appshunter.io/developer/1483738140) |

## What reviewers say

### Symbol Overlay Maker

[App page](https://appshunter.io/ios/app/symbol-overlay-maker/id1510255596)

Easily create printable symbol overlays for communication devices and switches. Supports core words, classroom activities, and home communication with a large symbol library.

**Highlights:** Create printable symbol overlays, Supports speech devices and switches, Includes SymbolStix symbol set, Supports core words and activities, Printable for home and classroom use

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

**In-app purchases:** none


### 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 Symbol Overlay Maker free?

Symbol Overlay Maker is free to download, with no in-app purchases.

### Is BDI free?

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

### Which has better reviews, Symbol Overlay Maker or BDI?

BDI is rated higher. Symbol Overlay Maker averages 2.0 out of 5 from 2 ratings, while BDI averages 2.3 from 6 ratings.

### Do Symbol Overlay Maker or BDI have ads?

Neither Symbol Overlay Maker nor BDI shows ads.

### Which is updated more often, Symbol Overlay Maker or BDI?

Symbol Overlay Maker ships an update every 6 months, and BDI every 2 months. Most recently, Symbol Overlay Maker was updated on September 23, 2026 and BDI on August 22, 2026.

---

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