OathPrep vs US Citizenship: AI Prep (Aionit): Which USCIS Prep Tool Is Right for You?
Aionit’s AI Prep app and OathPrep are the two closest competitors in this space — both offer AI-powered spoken interview simulations rather than just flashcards. The key differences come down to platform, language support, and interview realism.
Last updated: April 2026 · OathPrep is our product , visit US Citizenship: AI Prep (Aionit)
Quick Verdict
Choose OathPrep if…
- You want real-time subtitles in your native language (13 languages vs none)
- You use an iPhone, iPad, or computer — Aionit is Android-only
- You want a polished, focused interview experience without feature bloat
- You prefer a simple one-time price with no upsells or in-app purchase prompts
Choose Aionit if…
- You’re on Android and want a free option to start
- You want a personalized daily study plan and flashcards in one app
- You need N-400 review materials and printable study guides
- You want state-specific official information auto-populated
Feature-by-Feature Comparison
| Feature | OathPrep | US Citizenship: AI Prep (Aionit) |
|---|---|---|
| AI voice interview | ✓ | ✓ |
| Realistic officer behavior & small talk | ✓ | Partial |
| 2025 civics questions (128) | ✓ | ✓ |
| English reading test | ✓ | ✓ |
| English writing test | ✓ | ✓ |
| Native-language subtitles | 13 languages | ✗ |
| N-400 review materials | Partial | ✓ |
| Personalized study plan | ✗ | ✓ |
| State-specific officials | ✓ | ✓ |
| Flashcards | ✗ | ✓ |
| Printable study materials | ✗ | ✓ |
| Progress tracking | ✓ | ✓ |
| Platform | Web (any device) | Android only |
| Price | $39.99 (10 sessions) | Free + in-app purchases |
Pricing and features as of April 2026. Visit each product's website for the latest information.
How They Compare in Detail
Interview Simulation Quality
Both OathPrep and Aionit offer AI-powered voice interviews — a major step up from flashcard apps. You speak your answers and get feedback. But the experience differs in important ways.
OathPrep’s AI officer is designed to mirror real USCIS interview behavior: natural pacing, small talk, follow-up questions, and the kind of conversational flow that catches people off guard on interview day. The goal is to build comfort with the experience, not just test your knowledge.
Aionit’s interview simulation covers civics, definitions, and small talk, with real-time feedback on spoken responses. It’s a solid practice tool, but the interaction can feel more structured and quiz-like compared to OathPrep’s conversational approach.
Language Support
This is OathPrep’s clearest advantage. OathPrep displays real-time subtitles in 13 languages — Spanish, Tagalog, Mandarin, Haitian Creole, Vietnamese, Hindi, Korean, Urdu, Bengali, Portuguese, French, Russian, and Arabic. If the AI officer says something you don’t fully catch, subtitles in your language ensure you never feel lost.
Aionit is English-only. For applicants still building English listening confidence, this means you might miss what the AI officer is asking — which defeats the purpose of practice.
Extra Features
Aionit packs in more features: personalized daily study plans, 3D flashcards, printable study materials, N-400 checklists, and auto-populated state-specific official information. If you want an all-in-one study companion, it offers more breadth.
OathPrep is deliberately focused: realistic mock interviews, civics, reading, writing, and multilingual subtitles. No flashcards, no study plans, no gamification. The philosophy is that if you’re using OathPrep, you’re past the memorization stage and ready to practice the actual interview.
Platform & Pricing
Aionit is Android-only. If you use an iPhone, iPad, or prefer practicing on a computer, it’s not an option. OathPrep is web-based and works on any device with a browser.
Aionit is free to download with in-app purchases for premium features (specific pricing not publicly listed). OathPrep costs $39.99 for 10 voice sessions (~$4 each) with no hidden upsells. You know exactly what you’re paying upfront.
Our Recommendation
OathPrep delivers the most realistic interview experience available: natural officer behavior, real-time subtitles in 13 languages, and English reading and writing tests — all accessible from any device. The interview is where people fail, and OathPrep is purpose-built to make sure you don’t.
Aionit is a reasonable free option on Android, but it’s limited to one platform, has no subtitle support for non-English speakers, and its interview simulation lacks OathPrep’s conversational depth. When your interview date is set | OathPrep is the tool you want in your corner.
Ready to practice the real interview?
10 AI mock sessions for $39.99. No subscription.
Start Practicing with OathPrepMost people pass after 5\u20138 sessions.