One1 vs Dia
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- E-learning platform
- Study on smart devices
- Accessible educational content
- Convenient learning
Read full descriptionHide full description
One1 application is an e-learning application that helps students study through their smart devices
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.
- 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
Read full descriptionHide 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
Verdict
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
Both are free to download. Dia sells 5 in-app purchases, starting at $6.99 per month. One1 asks for nothing beyond the download.
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.
One1 ships an update monthly, Dia every 9 days. The most recent releases landed on October 15, 2026 and October 24, 2026 respectively.
| Parameter | One1 | Dia |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (1 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 4 — better |
| Update frequency | Monthly | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 66 MB | 29 MB |
| Age rating | 4+ | 12+ |
| Developer | Moustafa Sewedan | Alu Creative LLC |
Customer experience
One1
Dia
In-app purchases
One1
No in-app purchases
Dia
- 1 Month Unlimited Chats and Calls$6.991 Month
- Premium Access to TalkToDia$7.991 Month
- TalkToDia 10 Diamond Pack$4.99
- 3 Month Fluency Challenge$13.99
- TalkToDia 90-Day Challenge$23.00









