# BabyLex

> Toddler vocabulary size estimation and development tracking tool for parents. (iPhone/iPad app by Universitetet i Oslo.)

- Source: https://appshunter.io/ios/app/babylex/id1246774854 (this page in markdown: same URL + `.md`)
- Developer: [Universitetet i Oslo](https://appshunter.io/developer/667880740)
- Category: Education
- Price: Free
- Rating: 1.80/5 from 5 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 1.1 GB
- Languages: American English
- Released: 2019-06-19
- Data updated: 2026-06-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/babylex/id1246774854/reviews.md

## What is BabyLex?

We are parents and know how much fun it is to follow the development of your child. 

We are also researchers in child psychology and thus we have developed an app to estimate your toddler’s vocabulary size.

Using the BabyLex app you can follow the development of your child by completing the test as often as you like and seeing how your child’s vocabulary has increased. The test currently allows you to follow your monolingual toddler in English from 16 to 30 months of age, in German from 18 to 30 months of age, or in Norwegian from 18 to 36 months of age.

Once you have completed the test, you will see the result informing you the number of words your child likely produces from the long version of the vocabulary questionnaire (in other words, your child will likely produce that many words or more) and also a percentile score of your child – how she/he compares with other children of the same sex and age. 

We hope you have fun with this app – and we hope it helps you follow your child’s development in the same way we have followed ours!

The research: The BabyLex app features a novel approach that allows researchers and parents to assess reliably a child’s vocabulary within 2 minutes (as opposed to up to 45 minutes for full-sized tests). The research behind the algorithm can be accessed here and has been developed jointly with the universities of Oslo and Göttingen. Further information can be accessed on www.babylex.eu .

Note: it is an estimate so if you complete the test too soon after you completed a previous one, it is possible that the score may also go down. Don’t worry! This doesn’t mean your child has forgotten words – there is a margin of error for the estimate, i.e., a range where the app can make inaccuracies, and when you test the same child in shorter intervals, it is likely that the vocabulary estimate falls within this margin of error. That doesn’t mean you can’t test the same child – please do so, but this is just to say don’t worry!

Don’t also worry if your child doesn’t say most of the words on the list – the words are chosen at random and are not tailored to the capabilities of particular age-groups. So, it is just as likely that your child knows all the words on the list or none of the words on the list depending on how old s/he is and what words were randomly chosen by the app to test. We will still be able to provide a reliable estimate of your child’s vocabulary. 

Important disclaimer: This is merely an estimate provided by the app. It is not a clinical evaluation of your child’s language development. We are not doctors, we are researchers who are also parents and want to use our research to allow parents an insight into the development of their child. If you want a clinical evaluation of your child, please ask your pediatrician for contacts to the clinicians who can provide you such an evaluation.

## Key features

- Vocabulary size estimation
- Development tracking
- Percentile score comparison
- Research-backed algorithm
- Quick 2-minute tests

## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/babylex/id1246774854/reviews.md

### 1/5 — Inaccurate

*2024-03-13*

My “score” was off by at least 200 words. It estimated 107 and my child says over 300 words. That’s a pretty large margin of error to be of any use

### 1/5 — Won’t let me adjust date of birth.

*2023-12-16*

Because it won’t let me adjust the date of birth, it was asking vocabulary questions and calculating the percentage as if my child was a two-year-old instead of 11 months old.

### 1/5 — Age issues

*2023-03-06*

App won’t allow me to put my child’s age in; only permits 3 months to choose from; September- December of 2020 or 2021….

### 5/5 — Interesting

*2021-12-05*

I wish it gave more information. It gives an interesting snapshot of a kiddos vocabulary.

### 1/5 — Why is this app so enormous.

*2020-12-05*

Why?

## Frequently asked questions about BabyLex

### How does BabyLex estimate my child's vocabulary?

BabyLex uses a novel research-backed algorithm developed with universities to assess a child's vocabulary within a short test. It provides an estimated number of words your child likely produces and a percentile score compared to other children of the same age and sex.

### What age range and languages does BabyLex support?

BabyLex currently supports monolingual toddlers in English from 16 to 30 months, German from 18 to 30 months, and Norwegian from 18 to 36 months of age.

### Is BabyLex a clinical evaluation of my child's language development?

No, BabyLex provides an estimate for parents and researchers. It is not a clinical evaluation. For a clinical evaluation, please consult your pediatrician.

### Why might my child's score decrease if I test too soon after a previous one?

There is a margin of error for the estimate. Testing too soon after a previous test can result in the score falling within this margin of error, which does not mean your child has forgotten words.

### Does BabyLex have ads?

No, BabyLex does not contain advertisements.

### What devices is BabyLex available on?

BabyLex is available on iPhone, iPad, and iPod devices.

### How often is BabyLex updated?

BabyLex was last updated on August 8, 2019, with version 1.1. Further updates may be released to improve functionality and support.

### What is the user sentiment for BabyLex?

Based on the available data, BabyLex has a rating of 1.8 stars from 5 ratings, indicating a generally negative user sentiment.

## Version history (last 2 releases)

### 1.1 — 2019-08-08

Updated app description

### 1.0 — 2019-06-19

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*