Comparison

DREX vs Number Therapy

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

DREX

This free medical app provides training and assessment to help individuals compensate for partial visual loss. It offers self-adapting reading and exploration exercises that adjust in difficulty as you learn. You can also choose to share your progress data confidentially with healthcare professionals.

Highlights
  • Compensate for partial visual loss
  • Self-adapting reading training
  • Exploration training exercises
  • Regular assessments
  • Optional data sharing with clinicians
  • Home-based, unsupervised training
Features
Read full description

What is DREX? DREX is the Durham Reading and Exploration training. Through regular training and assessment this free app will teach you to compensate for your partial visual loss. How does DREX work? Training can be completed in your own home and at a time that suits you. You do not have to be supervised to complete this training. The app can be accessed by downloading it for free. DREX Training The DREX training consists of two parts: - The reading training requires you to decide whether a word is a real word or a non-word. - The exploration training presents you with a number of targets and you must find the target that is different from the rest by size, shape or colour. DREX training is self-adapting and increases in difficulty as you learn. DREX Assessment Whilst undergoing the DREX training you will be assessed at regular intervals. 5 assessments are used:- 1. Visual Field 2. Visual Search 3. Reading 4. Short Term Memory 5. Quality of life In this way we can learn whether the DREX training is an effective way of teaching you to compensate for your visual loss. Sharing your data You can also choose to share your data with your doctor, occupational therapist or clinician. In this way, they can track your progress and suggest other ways to maximise your compensation. This service is completely confidential and if you are uncomfortable with sharing your data you can still access the DREX training without this option. Contact us If you would like any further information then please feel free to contact by email drex.training@durham.ac.uk

About

Number Therapy

Practice understanding, saying, and typing numbers to improve essential communication skills. This app helps stroke survivors and individuals with cognitive disorders build independence with number-related tasks like dates, money, and phone numbers.

Highlights
  • Practice understanding, saying, and typing numbers
  • Covers dates, money, phone numbers, and more
  • Thousands of unique exercises
  • Customizable interface
  • Progress tracking and recommendations
  • Email progress reports for therapists
Currently charting
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Numbers communicate so much, yet they are often left out of communication therapy. Now stroke survivors can practice understanding, saying, and typing numbers at home to improve these essential life skills. ***Try for FREE with Number Therapy Lite*** “I really like it! The money and phone numbers – that’s what I need to practice.” – Sarah, stroke survivor with aphasia Age, dates, phone numbers, addresses, money, time, measurements, fractions, weight, years – numbers are everywhere and so important. Be more independent with communication with stronger number communication skills. Would you be able to understand, write down, and tell someone this phone message? “Your appointment is at 3:15 p.m. on August 3rd, 2015 at 1650 18th Avenue. Bring $5. Please call back to confirm at 785-5662.” Work on all these number skills and more with the evidence-based Number Therapy app! 30 categories of numbers including: *Single Digits *Double Digits *Triple Digits *Four Digits *Time *Money *Phone Numbers (add your own!) *Ordinals *Fractions Thousands of unique exercises you can use anywhere. Work at your own pace to practice the skills that matter to you. Great for cognitive disorders such as impaired working memory or auditory memory, too! Listen to long numbers and type them in - it's harder than it sounds. Train the ear to listen with this app. This app has the same highly customizable, clean, intuitive interface you’ve come to love in Tactus Therapy apps. Developed in conjunction with people with aphasia, this app is designed to help you get the intensity of practice you need in a way that is easy to use. Number Therapy also has a feature to give you recommendations for which level and settings you should use based on your score. See how easy it is to make progress when you're working at the right level for you! "Number Therapy is a game changer for me. I love it." - Trish, stroke survivor with aphasia Speech-Language Pathologists: use this app to make the communication of numbers a part of your therapy plan for people with aphasia or other disorders. Three unique activities address auditory and reading comprehension, verbal expression, and written expression. Your clients can use the built-in hints, cues, and audio recording to be successful, then e-mail you their results in a professional report so you can track their progress over time. Ideal for use in the clinic and at home, add Number Therapy to your therapy app collection! *Please note: this app does NOT address math skills or equations. It focuses on the communication of numbers, not calculations.

Screenshots

Number Therapy4 screens

Verdict

The call

The clearest difference is review sentiment: Number Therapy at 83% against DREX's 0%. Number Therapy also leads on rating (4.7 vs 1.0) and update cadence (every 4 months vs every 33 months). DREX's advantage is price (Free vs $29.99). On ads, in-app purchases and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

DREX is free to download; Number Therapy costs $29.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Number Therapy holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: Number Therapy has 266 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of DREX's written reviews are positive against 83% of Number Therapy's.

UpkeepUpdate frequency

DREX ships an update every 33 months, Number Therapy every 4 months. The most recent releases landed on September 30, 2026 and October 12, 2026 respectively.

Scorecard8 real differences · 3 level
DREX versus Number Therapy: the parameters behind the verdict, then further details
ParameterDREXNumber Therapy
PriceFree — better$29.99
Rating1.0 (1 ratings)4.7 (266 ratings) — better
Positive reviews0.0% of reviews83.3% of reviews — better
Number of ratings1266 — better
Update frequencyEvery 33 monthsEvery 4 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterFree with in-app purchases
Best chart rank—#192 — better
DevicesiPadiPhone, iPad, iPod — better
Requires iOS10.09.0 — better
Further details — not scored
Size87 MB7 MB
Age rating12+4+
DeveloperUniversity of DurhamTactus Therapy Solutions Ltd.

Customer experience

DREX

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Number Therapy

All ratings266 ratings
Positive93.6%
Neutral4.5%
Negative1.9%
Written reviews6 reviews
Positive83.3%
Neutral16.7%
Negative0.0%

In-app purchases

None

DREX

No in-app purchases

None

Number Therapy

No in-app purchases

Questions

Is DREX free?
DREX is free to download, with no in-app purchases.
Is Number Therapy free?
Number Therapy costs $29.99, with no in-app purchases.
Which has better reviews, DREX or Number Therapy?
Number Therapy is rated higher. DREX averages 1.0 out of 5 from 1 ratings, while Number Therapy averages 4.7 from 266 ratings.
Do DREX or Number Therapy have ads?
Neither DREX nor Number Therapy shows ads.
Which is updated more often, DREX or Number Therapy?
DREX ships an update every 33 months, and Number Therapy every 4 months. Most recently, DREX was updated on September 30, 2026 and Number Therapy on October 12, 2026.

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