Flexi vs osmSolver
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Flexi
Build your vocabulary and master new languages with an AI-powered flashcard system. Create personalized cards, get instant translations and definitions, and utilize spaced repetition for effective long-term memorization. Supports numerous languages and offers offline study options.
- Personalized flashcard creation
- AI-powered translations and definitions
- Spaced repetition system
- Text-to-speech pronunciation
- Offline study mode
- Progress tracking
- CSV import/export
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Flexi is an AI-powered vocabulary builder and language-learning flashcard app that turns a word or short expression into ready-to-study cards in seconds. Compare options for different meanings, edit any detail, and save one or several cards to your deck. Each AI-generated flashcard can include a translation, contextual example, definition, part of speech, and—where supported—a written pronunciation guide. Flexi then schedules reviews with FSRS-powered spaced repetition to help you remember vocabulary long term. WHY LEARN WITH FLEXI? - AI Flashcard Maker: Enter a word or short expression and get several editable card options for relevant meanings. - Complete Vocabulary Cards: Generate translations, examples, definitions, parts of speech, and pronunciation guides based on your deck’s language and settings. - Pronunciation Guides: Generate IPA for English, Spanish, German, Dutch, Czech, Finnish, and Romanian; kana for Japanese; Pinyin or Zhuyin for Mandarin Chinese; and Jyutping for Cantonese. - Spaced Repetition: Study and memorize new words with FSRS-based scheduling that plans reviews at the right time. - Text-to-Speech Audio: Hear words and examples to practice listening and pronunciation. - Flexible Card Creation: Add one card, select several meanings at once, or paste a word list to create flashcards in bulk. - Easy Imports: Bring your existing study decks from Anki, Quizlet, or CSV files. - English Vocabulary Sets: Start learning immediately with curated, ready-made word sets. - Quick Notes: Save words you meet in videos, books, or conversations and turn them into flashcards later. - Track Your Progress: Follow your learning progress and study comfortably with Dark Mode. FLEXI PREMIUM - Interactive AI Language Tutor: Ask questions about any flashcard, explore nuances, and practice fill-in-the-blank exercises at your level. - AI and Personal Images: Generate or upload images to strengthen visual memory. - Topic-Based Vocabulary: Build word sets for travel, business, idioms, small talk, and more. - Full Catalog Access: Unlock all curated English vocabulary sets. SUPPORTED LANGUAGES English, Spanish, French, German, Dutch, Japanese, Korean, Chinese (Simplified and Traditional), Italian, Portuguese, Russian, Arabic, Turkish, Swedish, Danish, Norwegian, Polish, Ukrainian, Hungarian, Czech, Thai, Hebrew, Vietnamese, Finnish, Romanian, and Serbian. Try Flexi Premium free for 7 days and build a vocabulary study system that fits your goals. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
osmSolver
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【シンプルで機能的な数式ソルバー】 osmSolverへようこそ。 複雑な計算を、もっとスマートに、もっと美しく。 osmSolverは、エンジニア、学生、そして数学を愛するすべての人のために設計された、iPhone/iPad専用の数学ソルバーアプリです。 ■ 思考を妨げないミニマルなデザイン ヴィンテージ・ハードウェアのような機能美にインスパイアされた、フラットで直感的なユーザーインターフェースを採用しました。装飾を削ぎ落としたシンプルなデザインは、あなたの計算作業に究極の集中力をもたらします。 ■ 主な機能 数式解決: 複雑な関数や記号を含む数式をスピーディーに処理します。 直感的な操作: iPhone/iPadに最適化されたレイアウトで、ストレスのない入力体験を提供します。 高精度な計算: 日々の学習からプロフェッショナルな現場まで幅広く対応する計算精度を備えています。 ■ こんな方におすすめ 複雑な計算を素早く、正確に行いたい方。 余計な装飾のない、シンプルでフラットなデザインを好む方。 信頼性の高い数学ツールをポケットに入れて持ち歩きたい方。
Screenshots
Verdict
The clearest difference is update cadence: Flexi at weekly against osmSolver's every 3 weeks. osmSolver's advantage is iOS requirement (15.5 vs 18.0). On price, ads, in-app purchases and device support 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. Flexi sells 4 in-app purchases, starting at $5.99 per month and osmSolver sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Flexi ships an update weekly, osmSolver every 3 weeks. The most recent releases landed on October 30, 2026 and October 13, 2026 respectively.
| Parameter | Flexi | osmSolver |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (138 ratings) — better | — |
| Positive reviews | 76.6% of reviews | — |
| Number of ratings | 138 — better | — |
| Update frequency | Weekly — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 15.5 — better |
| Further details — not scored | ||
| Size | 82 MB | 22 MB |
| Age rating | 12+ | 4+ |
| Developer | Tomer Beilinson | Osamu Ushikubo |
In-app purchases
Flexi
- Premium Monthly7 Days trial$5.991 Month
- Premium Monthly$5.991 Month
- Premium Annual7 Days trial$29.991 Year
- Premium Lifetime$99.99
osmSolver
- osmSolver LITE$2.99
- osmSolver PRO$2.99
- osmSolver PRO (フル版)$4.99








