# TallyFlex vs Behavior Observer

The clearest difference is update cadence: TallyFlex at every 10 days against Behavior Observer's every 2 months. TallyFlex also leads on iOS requirement (15.0 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. TallyFlex sells 2 in-app purchases, starting at $27.99 per month and Behavior Observer sells 2 in-app purchases, starting at $49.99 per year. Whichever you choose, the download price is not the number that matters.

TallyFlex ships an update every 10 days, Behavior Observer every 2 months. The most recent releases landed on October 12, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | TallyFlex | Behavior Observer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (87 ratings)](https://appshunter.io/ios/app/tallyflex-aba-data-collection/id1531412972/reviews)** | — |
| Number of ratings | **87** | — |
| Positive reviews | 64.1% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 87 MB | 4 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [TallyFlex LLC](https://appshunter.io/developer/1531412974) | [Daniel Zaccaro](https://appshunter.io/developer/1895771100) |

## What reviewers say

### TallyFlex

[App page](https://appshunter.io/ios/app/tallyflex-aba-data-collection/id1531412972)

This app replaces paper data sheets for behavioral data collection. It helps professionals like BCBAs and RBTs work faster and more accurately with clients in clinics, schools, and homes. It offers various tracking methods and secure data export for reports.

**Highlights:** Replace paper data sheets, Track ABC data, frequency, duration, latency, Automatic timers for interval recording, Task analysis and prompt codes, Track multiple behaviors simultaneously, Export data to PDF, CSV, XLSX, Works offline

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TallyFlex Solo Monthly | $27.99 | per month |
| Solo Yearly | $279.99 | per year |

**What reviewers like**

- 👍 Easy to use and user-friendly
- 🚀 Quick data collection
- 📊 Visual reports and data tracking
- 💡 Customizable behavior tracking
- ✅ Great for RBTs and BCBAs

**What reviewers complain about**

- 💰 Subscription model disliked
- 📉 Data export challenges
- 🐛 Calculation glitches
- 🤔 Lack of clear documentation/help
- 🚫 Inability to add/manage students (free version)

**Reported bugs**

- Calendar not showing current sessions
- Data export results in empty Excel sheet
- Calculations and percentages are unreliable
- Data stops being counted after a certain number of opportunities
- Exported data format for duration is hard to graph

**Requested features**

- Offer a 'lite' subscription for SLPAs/BCaBAs
- Add more data collection options/types (chaining, TAs, checklists)
- Allow uploading pre-made data sheets
- Add sound alerts for timers
- Ability to re-organize behaviors on screens


### Behavior Observer

[App page](https://appshunter.io/ios/app/behavior-observer/id6789358581)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Behavior Observer Pro | $49.99 | per year |
| Behavior Observer Pro Lifetime | $149.00 | one-time |


## Frequently asked questions

### Is TallyFlex free?

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

### Is Behavior Observer free?

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

### Do TallyFlex or Behavior Observer have ads?

Neither TallyFlex nor Behavior Observer shows ads.

### Which is updated more often, TallyFlex or Behavior Observer?

TallyFlex ships an update every 10 days, and Behavior Observer every 2 months. Most recently, TallyFlex was updated on October 12, 2026 and Behavior Observer on October 6, 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.*