Comparison

One1 vs Dia

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

Head to head
About

One1

This e-learning app provides students with a digital platform to study and learn directly from their smart devices. It aims to make educational content accessible and convenient for users on the go.

Highlights
  • E-learning platform
  • Study on smart devices
  • Accessible educational content
  • Convenient learning
Read full description

One1 application is an e-learning application that helps students study through their smart devices

About

Dia

Practice speaking a new language with an AI tutor that offers personalized feedback on pronunciation and grammar. Choose from over 40 languages and specific dialects, and customize your AI teacher's personality and voice for a realistic conversation experience.

Highlights
  • 40+ languages and dialects
  • Customizable AI teacher personality
  • Real-time grammar and pronunciation feedback
  • Voice-first conversational practice
  • Adaptive difficulty levels
  • Fluency tracking and analytics
Features
Read full description

Dia is an AI language tutor you talk to out loud. Speak from your first conversation, see a better way to say it when you slip, and call Dia when you want live speaking practice. PRACTICE SPEAKING, OUT LOUD Tap the mic and talk. Dia answers in the language you're learning, keeps the conversation going with follow-up questions, and can help in your language when you say you can't follow. Choose how Dia speaks to you: Easy, Standard or Native. CALL YOUR TUTOR Start a voice call and talk in real time, like a phone call. Follow along with captions you can show or hide, ask questions, and rehearse the conversations you want to have in real life. LEARN FROM YOUR MISTAKES Dia points out slips in chat, shows a better way to say it and explains why in a short note. Then the conversation keeps going. Words and phrases you look up are saved for review and start coming back the next day: say each one out loud, then check. CUSTOMIZE YOUR OWN TUTOR Find a tutor you click with. Pick a look and a name from hundreds of options, choose a voice, and edit your tutor any time. UNDERSTAND EVERY REPLY Read translations and tips in your app language, and turn on romanization such as pinyin or romaja in tips. Long-press a reply to copy it or ask about that line. With Premium, Dia reads replies out loud, so you can listen as you read or switch to voice only for listening practice. PRACTICE REAL-LIFE SITUATIONS Order at a café or restaurant, check in at a hotel, take a phone call or chat on a plane. Getting ready for a B1 or B2 speaking exam, a move abroad or a job interview? Describe your own scenario and practice it with Dia. It's conversation practice, not an official mock exam. PRACTICE YOUR TARGET LANGUAGE Choose from 42 language and regional options across 28 languages, including English (US, UK, Australia, Ireland, New Zealand), Spanish (Spain, Mexico, Argentina, Colombia), French (France, Canada), German (Germany, Austria, Switzerland), Portuguese (Brazil, Portugal), Chinese (Mainland, Taiwan), Japanese, Korean, Italian, Arabic and more. Not sure of your level? Take the free level check from A1 to C2 in English, Spanish, French, Japanese, Korean or Chinese. PICK UP WHERE YOU LEFT OFF Continue your last chat from the home screen, revisit your word bank, and see how many words and phrases are saved and when the next review is due. In later chats and calls, Dia can bring back goals and interests you've mentioned. LANGUAGE GUIDEBOOKS Explore writing systems, sounds, sentence patterns and short practice activities for the language you're learning. Guidebook progress is saved to your account. Listening examples use a voice available on your device. Designed for adult learners. A free account is required for chat and includes 10 messages and 2 call minutes a day. Premium removes the daily message limit, reads Dia's replies out loud and includes 10 call minutes a day. New accounts start with 24 hours of Premium, including 10 call minutes in total. It does not turn into a paid plan. Guidebooks are free on every plan. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://talktodia.com/privacy

Screenshots

One14 screens
Dia4 screens

Verdict

The call

The clearest difference is rating: Dia at 5.0 against One1's 3.0. Dia also leads on update cadence (every 9 days vs monthly) and ratings volume (4 vs 1). One1's advantage is in-app purchases (none vs 5). 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. Dia sells 5 in-app purchases, starting at $6.99 per month. One1 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Dia holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

UpkeepUpdate frequency

One1 ships an update monthly, Dia every 9 days. The most recent releases landed on October 15, 2026 and October 24, 2026 respectively.

Scorecard5 real differences · 5 level
One1 versus Dia: the parameters behind the verdict, then further details
ParameterOne1Dia
PriceFreeFree
Rating3.0 (1 ratings)5.0 (4 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings14 — better
Update frequencyMonthlyEvery 9 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS15.015.0
Further details — not scored
Size66 MB29 MB
Age rating4+12+
DeveloperMoustafa SewedanAlu Creative LLC

Customer experience

One1

All ratings1 ratings
Positive0.0%
Neutral100.0%
Negative0.0%

Dia

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

One1

No in-app purchases

5 purchases

Dia

Subscriptions2
  • 1 Month Unlimited Chats and Calls$6.991 Month
  • Premium Access to TalkToDia$7.991 Month
One-time3
  • TalkToDia 10 Diamond Pack$4.99
  • 3 Month Fluency Challenge$13.99
  • TalkToDia 90-Day Challenge$23.00

Questions

Is One1 free?
One1 is free to download, with no in-app purchases.
Is Dia free?
Dia is free to download, with in-app purchases available.
Which has better reviews, One1 or Dia?
Dia is rated higher. One1 averages 3.0 out of 5 from 1 ratings, while Dia averages 5.0 from 4 ratings.
Do One1 or Dia have ads?
Neither One1 nor Dia shows ads.
Which is updated more often, One1 or Dia?
One1 ships an update monthly, and Dia every 9 days. Most recently, One1 was updated on October 15, 2026 and Dia on October 24, 2026.

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