Comparison

Grammobolica vs Oki

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

Head to head
About

Grammobolica

This app offers daily language practice for adults who want to improve their speaking skills. It focuses on translating sentences aloud, building vocabulary, and using grammar in context. Track your progress with a built-in study planner and access full grammar courses from A1 to B2.

Highlights
  • Daily speaking drills
  • Voice translation and pronunciation check
  • Vocabulary building with SRS
  • Grammar theory and hints
  • Structured A1-B2 grammar courses
  • Study planner for progress tracking
Features
Read full description

Grammobolica is your Language Gym — a daily training space for adults who studied a language before but still can't speak it. The goal: speak out loud every day. Real reps, not streaks. Pick a topic, do 3 sets of 10 sentence translations aloud, get checked by your native coach. Grammobolica trains you to actually USE grammar — not just read rules. Say full sentences aloud, get graded word by word, and build a vocabulary that comes straight out of your own mistakes. Learn English, Spanish, German, French, Portuguese, Polish, Indonesian, or Serbian. NEW IN 3.1.6 Refreshed Interface Cleaner screens and a new checkpoint after every set. Promo Codes Redeem a code right in Settings. New Name: Grammobolica Mnemolearn is now Grammobolica — same app, same account, all your progress. GRAMMAR TRAINER Choose a topic and get 10 sentences. Translate from your language out loud, then reveal and check. Missed some? A short extra round replays exactly those. Voice Mode Speech recognition checks your spoken answer against the target sentence. A word only counts if it was hidden when you said it — reading it off the screen doesn't. Word Hints on Tap Tap a word for its translation or grammar role, its learning status, and its forms — articles, cases, endings. Grammar Theory Every sub-topic has theory, key rules and notes. Peek at hints anytime during drills. Full Courses (A1–B1) All topics organized into courses and lessons. Follow the structured path or jump to any topic you need. FLASHCARDS Smart Vocabulary (8-Stage SRS) Review by swiping right (know) or left (don't know). 8 stages with growing intervals — words stick permanently. Cards come straight from your drills, so you study exactly what you missed. SHADOWING TRAINER 330 everyday phrases — greetings, requests, opinions. Repeat after the native speaker, record your voice and compare. AI text-to-speech reads any phrase or sentence in a natural voice. STREAKS Keep your daily training going, track it from the home screen widget, and share your progress. AVAILABLE LANGUAGES Learn: English, Spanish, German, French, Portuguese, Polish, Indonesian, Serbian Interface: 17 languages including Russian, German, French, Spanish, Portuguese, Japanese, Korean, Chinese, Turkish PERFECT FOR - Beginners starting from A1 with structured courses - Intermediate learners (A2–B1) fixing grammar gaps with targeted drills - Anyone who wants to practice speaking with voice recording - Vocabulary builders who want smart spaced repetition - Students preparing for language exams WHY GRAMMOBOLICA Duolingo gives you games. Babbel gives you lessons. Anki gives you blank flashcards. Grammobolica gives you a gym — sentence drills spoken out loud and graded word by word, with grammar theory, thousands of sentences and a native coach for every language. Real reps. Real speech. PRICING Free: 3 drill sessions/day, core vocabulary SRS, grammar browsing, 30 TTS plays/day Pro: Unlimited drills, unlimited TTS, all features unlocked Download Grammobolica and start training your speech — one workout a day.

About

Oki

Learn English with personalized lessons, speaking and writing practice, and detailed feedback from an AI coach. Create flashcards and track your progress across all language skills. This app offers a comprehensive approach to mastering English.

Highlights
  • Personalized lessons based on interests
  • Speaking and writing practice
  • Detailed feedback on mistakes
  • AI coach for real-time conversation
  • Flashcard creation
  • Progress tracking
Features
Read full description

Learning English across multiple apps is inefficient. Oki combines personalized lessons, speaking practice, writing tasks, flashcards, and a personal AI coach in a single interface. Oki teaches 13 languages: English, Spanish, Japanese, Chinese, Kazakh, Italian, French, Vietnamese, Korean, German, Filipino, Indonesian and Hindi. What Oki offers: — Lessons created around your interests. The app generates study materials based on the topics that matter to you: from travel and technology to literature and business. You stay engaged and remember more. — Speaking practice with intelligent feedback. You speak, and the system analyzes your pronunciation, fluency, and vocabulary usage. Oki highlights exactly what can be improved and suggests adjustments that help you sound more natural. — Writing practice and homework review. Written assignments are checked in detail: every mistake is not just corrected, but explained. You receive a breakdown that shows the reason behind each error, which helps you avoid it in the future. — Flashcards with interval repetition. Completed material is automatically turned into flashcards. The system shows them at the optimal moment so that knowledge moves into long-term memory without unnecessary cramming. — Real-time AI coach conversations. Each dialogue adapts to your current level. New words and phrases are introduced gradually, without overload, so your vocabulary expands naturally during the conversation. Coming soon: — Automatic generation of a complete study program built around your interests and goals.
— Watching YouTube videos with translation and the ability to create lessons based on any video.
— Full in-bot communication without distractions from external tools. Why people choose Oki: A single environment. Lessons, speaking, writing, flashcards, and feedback are available in one app. There is no need to download separate programs for each skill. Real, measurable progress. Unlike traditional apps that mainly offer mechanical exercises in a glossy package, Oki tracks concrete metrics: practice time, number of words spoken, and completed lessons. You always know exactly how far you have come. Tracking of all language skills. Detailed statistics let you see not only completed topics but also the balance between speaking, writing, and revision. Notifications support consistency without harsh pressure. Structured tasks, not endless chat. Unlike text-based AI chatbots, Oki provides a format close to study materials: full lessons, flashcards, verified tasks with error breakdowns. This goes deeper than simply exchanging messages with a bot. Personalization without overload. The AI remembers your interests, preferred pace, and learning style. The difficulty of new words increases gradually, so you never face abrupt jumps or lose confidence. Higher accuracy of feedback. The system detects errors 64% more accurately than comparable solutions and provides corrective feedback that contributes to real improvement, not just a formal check. The method behind Oki was developed with input from English teaching experts from the United States. The project is powered by the Aleem Labs team — an educational community that has been helping learners with free guides for two years. These materials have been used by more than 600,000 people, and an additional 3,000 students from 35 countries have completed training through the team’s programs. Three actions required to master a language: • Learning new words and phrases. • Practicing speaking and writing. • Reviewing through an interval repetition system. Oki implements all three stages: personalized lessons for acquiring new knowledge, speech and writing practice with feedback, and flashcards for reinforcement. This is exactly why users achieve noticeable results. Download Oki and start learning English systematically — without the chaos of multiple apps and superficial cramming. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Grammobolica4 screens
Oki4 screens

Verdict

The call

The clearest difference is rating: Grammobolica at 5.0 against Oki's 4.4. Grammobolica also leads on review sentiment (100% vs 64%) and iOS requirement (15.5 vs 17.0). Oki's advantage is ratings volume (392 vs 1). On price, update cadence, ads and in-app purchases 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. Grammobolica sells 5 in-app purchases, starting at $1.99 per 7 days and Oki sells 11 in-app purchases, starting at $1.00 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Grammobolica holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Oki has 392 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Grammobolica's written reviews are positive against 64% of Oki's.

UpkeepUpdate frequency

Grammobolica ships an update weekly, Oki every 4 days. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

Scorecard4 real differences · 6 level
Grammobolica versus Oki: the parameters behind the verdict, then further details
ParameterGrammobolicaOki
PriceFreeFree
Rating5.0 (1 ratings) — better4.4 (392 ratings)
Positive reviews100.0% of reviews — better63.8% of reviews
Number of ratings1392 — better
Update frequencyWeeklyEvery 4 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.5 — better17.0
Further details — not scored
Size155 MB98 MB
Age rating4+12+
DeveloperEvgenii DadonovAlidar Kuchukov

Customer experience

Grammobolica

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Oki

All ratings391 ratings
Positive84.1%
Neutral2.0%
Negative13.8%
Written reviews141 reviews
Positive63.8%
Neutral9.9%
Negative26.2%

Bugs and requests

Grammobolica

Not enough reviews yet to summarise bugs or requests.

Oki

Reported bugs

1 issue
  • Registration process not working properly

Requested features

2 requests
  • Ability to register through third-party accounts
  • More language learning options

In-app purchases

5 purchases

Grammobolica

Subscriptions5
  • Weekly Plan$1.997 Days
  • Monthly Plan3 Days trial$6.991 Month
  • Month (Diligent Student)1 Month trial$6.991 Month
Show 2 more
  • Yearly Plan3 Days trial$34.991 Year
  • Year (Diligent Student)1 Year trial$34.991 Year
11 purchases

Oki

Subscriptions11
  • Oki Promotion Monthly$1.001 Month
  • Oki Premium 80% Off Discount$1.991 Month
  • Oki Pro Monthly 50% Off$2.991 Month
Show 8 more
  • Oki Premium 50% off Discount$4.991 Month
  • Oki Pro Monthly$5.991 Month
  • Oki Pro$9.991 Month
  • Aleem Monthly3 Days trial$9.991 Month
  • Oki Promotion Annual$10.001 Year
  • Oki Pro Annual$29.991 Year
  • Oki Annual$88.001 Year
  • Aleem Annual3 Days trial$88.001 Year

Questions

Is Grammobolica free?
Grammobolica is free to download, with in-app purchases available.
Is Oki free?
Oki is free to download, with in-app purchases available.
Which has better reviews, Grammobolica or Oki?
Grammobolica is rated higher. Grammobolica averages 5.0 out of 5 from 1 ratings, while Oki averages 4.4 from 392 ratings.
Do Grammobolica or Oki have ads?
Neither Grammobolica nor Oki shows ads.
Which is updated more often, Grammobolica or Oki?
Grammobolica ships an update weekly, and Oki every 4 days. Most recently, Grammobolica was updated on October 25, 2026 and Oki on October 28, 2026.

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