The short version
Duolingo is a general-purpose language app that covers dozens of languages. It's great for building a daily habit, learning basic phrases, and getting a feel for how Russian sounds. But when it comes to the things that make Russian hard - cases, conjugation, aspect pairs - it stays surface-level.
Slova does one thing: Russian vocabulary with grammar depth. Every word comes with its full paradigm. Exercises test real production (typing, not tapping). It's not trying to replace Duolingo - it picks up where Duolingo stops being useful.
Feature comparison
| Feature | Duolingo | Slova |
|---|---|---|
| Case training | Introduced implicitly | All 6 cases, fill-in-the-blank drills |
| Declension tables | Not available | Full tables for every noun & adjective |
| Verb conjugation | Shown in context | Full conjugation tables + targeted drills |
| Aspect pairs | Not explicitly taught | Linked pairs with context sentences |
| Exercise format | Mostly multiple choice | Typing-based (production) |
| Vocabulary size | Fixed course (~2000 words) | A1-B1 curated library plus unlimited user-added words |
| Listening & speaking | Audio exercises, speech recognition | Text-based only (for now) |
| Gamification | Streaks, XP, leagues, hearts | Minimal - focused on learning |
| Spaced repetition | Proprietary algorithm | SM-2 with per-word scheduling |
| Custom word lists | Fixed curriculum | Add any word, exercises auto-generate |
| Price | Free (with ads/hearts) or $7/mo | Free |
| Languages | 40+ languages | Russian only |
Where Duolingo wins
Let's be fair. Duolingo is better at several things:
- Absolute beginners. If you've never seen Cyrillic before, Duolingo's alphabet lessons and audio exercises are a better starting point.
- Listening and pronunciation. Slova is text-only. Duolingo has audio for every sentence and (on paid plans) speech recognition.
- Habit building. The streak system, daily reminders, and gamification are genuinely effective at keeping people coming back.
- Sentence translation. Duolingo teaches full sentences from day one, which builds reading comprehension and a feel for word order.
Where Slova wins
Slova is better for learners who've outgrown the basics:
- Grammar depth. Slova doesn't just show you a word in a sentence - it shows you all 12 forms of a noun, tests each case separately, and explains why the genitive is used after numbers.
- Real production. Typing "книгу" in an accusative blank is harder than tapping a word tile. But it's what builds the neural pathways you need for speaking and writing.
- Verb system. Russian aspect pairs are the single hardest concept for English speakers. Slova links imperfective/perfective pairs and tests you on choosing the right one.
- Custom vocabulary. Encountered a word in a podcast or class? Add it to Slova and exercises are auto-generated with AI. No waiting for a course to cover it.
- No distractions. No hearts, no ads, no leagues, no social pressure. Just you and the language.
The verdict
Duolingo and Slova aren't really competitors - they're complements. Duolingo is the on-ramp: it teaches you to read Cyrillic, recognize basic patterns, and build a daily habit. Slova is the training gym: it's where you do the hard reps that turn passive recognition into active knowledge.
If you're just starting Russian, start with Duolingo. When you hit the wall - when you realize you can recognize words but can't decline them, when multiple choice feels too easy but free writing feels impossible - that's when Slova becomes essential.