Comparison

UDWriter vs KoeTra

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

Head to head
About

UDWriter

A handwriting memo app designed with Universal Design principles for intuitive use. Offers three color options and a simple swipe gesture to clear the screen. Accessible for all users from the first use.

Highlights
  • Universal Design principles
  • Handwriting memo functionality
  • Select 3 colors
  • Swipe to clear all
  • Intuitive for all users
Features
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"We got gold prize in IAUD Award Communication Design Category." This is a application of "hand writing memo" that is based on Universal Design. - Select 3 colors. - Swipe left on the corner, clear all. - For the first time, everyone can use this. URL Scheme is udwriter://

About

KoeTra

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The method of communication between those with normal hearing and those with hearing impairments generally takes a written form. However, because this may take time or be burdensome, the hearing impaired may not get the information that they need. "KoeTra" supports smooth communication by utilizing both speech recognition and speech synthesis technology. 1)Input by speech is available You can input speech even without typing on the keyboard ・You can easily have a conversation with someone who does know sign language ・Even those who aren't used to text input can easily use it 2)Words can be expressed as speech Get your point across even if the other person doesn't read the text. ・The conversation will progress smoothly by expression with speech ・You can have a conversation with a visually impaired person" 3)Anyone can easily use it Even those who are not used to smart phones can easily respond. ・ Even first timers can use it intuitively by only pressing buttons ・You can get your point across by expressing information using drawings or maps 4)Register and use fixed phrases By registering phrases that are used often as fixed phrases, they can quickly and easily be recalled. ・The trouble of inputting is saved by just selecting the fixed phrase ・By organizing them into categories, the fixed phrase that you want to use can be smoothly selected. ・As there is a feature to arrange them according to convenience, they can be set to suit you. 5)Express things like feelings, or even seasons, using stamps Things such as feelings can be expressed to others using stamps ・ Word input can be reduced by using stamps ・There are an abundance of stamp categories, such as "Seasonal Items", "Cat", "Lion", etc. 6)Connect multiple devices and have a conversation If multiple devices connect mutually, you can participate in a conversation with each device ・Even people who are deaf, or people who don't know sign language can connect using their own device and have a conversation at the same time ・By connecting with your own device, you can use the fixed phrases that you yourself have created. ・The conversation history is saved on each individual device.

Screenshots

UDWriter3 screens
KoeTra4 screens

Verdict

The call

The clearest difference is in-app purchases: KoeTra at none against UDWriter's 2. UDWriter's advantage is update cadence (every 2 months vs every 9 months). On price, ads, device support 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

Both are free to download. UDWriter sells 2 one-off in-app purchases. KoeTra asks for nothing beyond the download.

UpkeepUpdate frequency

UDWriter ships an update every 2 months, KoeTra every 9 months. The most recent releases landed on October 12, 2026 and October 7, 2026 respectively.

Scorecard2 real differences · 6 level
UDWriter versus KoeTra: the parameters behind the verdict, then further details
ParameterUDWriterKoeTra
PriceFreeFree
Positive reviews37.5% of reviews—
Update frequencyEvery 2 months — betterEvery 9 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better13.0
Further details — not scored
Size10 MB32 MB
Age rating4+4+
DeveloperShamrock Records, Inc.FEAT Limited

In-app purchases

2 purchases

UDWriter

One-time2
  • Development Support + Logo on/off option$2.99
  • Input Text by Using Speech Recognition$4.99
None

KoeTra

No in-app purchases

Questions

Is UDWriter free?
UDWriter is free to download, with in-app purchases available.
Is KoeTra free?
KoeTra is free to download, with no in-app purchases.
Do UDWriter or KoeTra have ads?
Neither UDWriter nor KoeTra shows ads.
Which is updated more often, UDWriter or KoeTra?
UDWriter ships an update every 2 months, and KoeTra every 9 months. Most recently, UDWriter was updated on October 12, 2026 and KoeTra on October 7, 2026.

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