Comparison

Spello vs Oki

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

Head to head
About

Spello

Expand your English vocabulary with curated word sets tailored to your proficiency level, from beginner to advanced. Prepare for international exams and track your daily progress with intuitive statistics to build a consistent learning habit.

Highlights
  • Level-based word sets (A1-C2)
  • Preparation for Cambridge Exams
  • Progress tracking and statistics
  • Daily learning habit builder
  • Vocabulary expansion
Features
Read full description

SPELLO – эксперт в лексике! Увеличивай словарный запас вместе с нами совершенно БЕСПЛАТНО! ПОЧЕМУ SPELLO? 1. НАБОРЫ СЛОВ, СООТВЕТСТВУЮЩИЕ ВАШЕМУ УРОВНЮ Впервые мы создали наборы слов, в которых слова соответствуют вашему уровню владения языком. Вам не нужно учить случайные слова! Вы будете иди четко вверх по ступеням от А1 до С2. Все что вам нужно сделать, это определить свой уровень английского языка и продолжить увеличивать свой словарный запас или начать с самого нуля и заполнить свои пробелы. 2. ВЫ СМОЖЕТЕ ПОДГОТОВИТЬСЯ К СДАЧЕ МЕЖДУНАРОДНЫХ ЭКЗАМЕНОВ Уровни наборов соответствуют требованиям Cambridge Exams. 3. СТАТИСТИКА ПОМОЖЕТ КОНТРОЛЛИРОВАТЬ ВАШ УСПЕХ Мы хотим чтобы изучение английского языка стало вашей приятной привычкой, поэтому в приложении вас ждет удобный трекер. Мы надеемся, что он будет мотивировать вас заниматься английским каждый день и не пропускать. Если у вас есть идеи или вы знаете, как улучшить приложение, то смело пишите нам: - в Instagram: @spello.app - на почту: help.spello@gmail.com Privacy Policy http://bit.ly/spello-PrivacyPolicy Pricing Terms http://bit.ly/spello-PricingTerms

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

Spello4 screens
Oki4 screens

Verdict

The call

The clearest difference is ads: Oki at none against Spello's shown. Spello's advantage is iOS requirement (12.0 vs 17.0). On price, review sentiment, update cadence 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. Spello sells 1 in-app purchase, starting at $2.49 per month 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.

UpkeepUpdate frequency

Spello ships an update every 8 days, Oki every 4 days. The most recent releases landed on October 17, 2026 and October 28, 2026 respectively.

Scorecard2 real differences · 8 level
Spello versus Oki: the parameters behind the verdict, then further details
ParameterSpelloOki
PriceFreeFree
Rating—4.4 (392 ratings) — better
Positive reviews62.5% of reviews63.8% of reviews — better
Number of ratings—392 — better
Update frequencyEvery 8 daysEvery 4 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better17.0
Further details — not scored
Size41 MB98 MB
Age rating4+12+
DeveloperSergei GavrilkoAlidar Kuchukov

Customer experience

Spello

Written reviews8 reviews
Positive62.5%
Neutral25.0%
Negative12.5%

Oki

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

Bugs and requests

Spello

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

1 purchases

Spello

Subscriptions1
  • Полный доступ$2.491 Month
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 Spello free?
Spello is free to download, with in-app purchases available.
Is Oki free?
Oki is free to download, with in-app purchases available.
Do Spello or Oki have ads?
Spello shows ads; Oki does not.
Which is updated more often, Spello or Oki?
Spello ships an update every 8 days, and Oki every 4 days. Most recently, Spello was updated on October 17, 2026 and Oki on October 28, 2026.

Other comparisons