PromptFluent vs Plainly AI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PromptFluent
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PromptFluent is the app that teaches you the language of AI. Master prompt engineering, technical vocabulary, and professional communication for ChatGPT, Claude, Copilot, and beyond. Works for English, Spanish, and Portuguese (Brazilian) speakers. THREE NATIVE LANGUAGE MODES Choose your language on first launch: - English speakers: 40 AI-focused lessons on prompt engineering and technical communication - Spanish speakers: 80 bilingual lessons combining English learning with AI terminology - Portuguese speakers: the same 80 lessons; the interface and most reference modules are in Portuguese, while lesson explanations, vocabulary and grammar support text are still shown in Spanish while that translation is completed THREE LEARNING MODES STUDY - Work through structured lessons across 16 units covering four proficiency levels (Starter to Architect). Each lesson includes teaching content, vocabulary, grammar, dialogues with AI, and a quiz. Browse our encyclopedia of 560+ tech terms across 15 categories, study with flashcards, master English grammar with 24 tech-focused lessons, and explore 60 copy-ready prompt templates. Discover 10 AI use cases, a glossary of 20 AI tools, 24 reading comprehension passages, and 16 dev culture notes. PRACTICE - Build real AI skills, grouped the way you use AI. ASK: Prompt Workshop (write prompts and get scored on task, detail and technique), Prompt Lab (see how each part of a prompt changes the answer) and Use AI at Work (24 workplace prompts). REFINE: Refine the Answer (pick the best follow-up when the first answer misses). EVALUATE: Trust Check (judge AI answers with a 4-point checklist) and AI Fact-Check & Safe Use (catch AI mistakes and know what not to paste). REVIEW: Spaced Repetition Review Hub. Spanish and Portuguese speakers also get English for AI: Daily Drills, AI Conversations, Listening Hub, Sentence Scramble, Error Drill, Email & Messages and Verb Hub. PLAY - Prompt Debugger (40 challenges to find what a weak prompt is missing) and Daily Challenges, plus Story Mode, Context Guesser and Translation Shootout for English learners. STRUCTURED LESSONS Progress through a curriculum designed for AI communication: - Starter (Lessons 1-20): First contact with AI, basic tech vocabulary, simple prompt patterns, reading AI output - Practitioner (Lessons 21-40): Coding vocabulary, describing code to AI, technical documentation, intermediate prompt engineering - Builder (Lessons 41-60): Complex prompt structures, working with coding agents, technical English grammar, professional communication - Architect (Lessons 61-80): Advanced prompt engineering, system design communication, AI agent orchestration, mastery Each lesson features five interactive sections: Teach, Vocabulary, Grammar, Dialogue, and Quiz. Score 60% or higher to unlock the next lesson. SMART LEARNING TOOLS - Spaced Repetition System (SRS) using the SM-2 algorithm - 50 English verb conjugation tables for technical verbs - 60 prompt templates organized by task type - 24 reading comprehension passages from real tech docs - Progress dashboard with skill radar, weekly goals, and universal bookmarks - Text-to-speech for all English content - Dark mode support GAMIFICATION - 20-level XP progression system (Newbie to Supreme) - 8 achievement badges to unlock - Daily challenges with XP rewards - Streak tracking for consistent habits Works 100% offline. No account required. All data stays on your device.
Plainly AI
Learn about artificial intelligence in simple terms with no jargon. This app breaks down complex AI concepts into easy-to-understand lessons with everyday examples. It offers free introductory modules and a glossary, with an option to unlock the full library for a one-time purchase.
- Plain English AI explanations
- Everyday examples
- Key takeaways and practical tips
- Glossary of AI terms
- Adjustable text size and dark mode
- Progress tracking on device
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AI is in the news, on your phone, at the bank and at the doctor's office. Plainly explains what it is and how it works, in plain English, a few minutes at a time. No jargon. No assumed knowledge. No account to create. Each lesson takes one idea and makes it clear, with everyday examples. It ends with a key takeaway, something practical to try today, and a quick question to check that it stuck. Sandra, our presenter, welcomes you in. THE FIRST SIX MODULES ARE FREE What AI is, and what it is not ChatGPT, Gemini, Copilot, Meta AI and Claude: where you will meet them How to ask questions that get useful answers When to trust it, when to double-check, and the habits that beat scams Where AI already shows up in your day What stays yours, and where to go next READ ONE PAID LESSON FREE Pick any one of the 13 deeper modules and read its first lesson free. THEN UNLOCK THE FULL LIBRARY, ONCE Your health, your money, around the house, travel, privacy, family, the news, work, creativity, the bigger picture, care and wellbeing, your legacy and how to think about what comes next. One purchase. No subscription. Restore it on any iPhone or iPad signed in to your Apple Account. COMFORTABLE TO READ Adjustable text size from Standard to Extra large in lessons, Daily Moments and the glossary. Dark mode that follows your device's setting, or that you set yourself. Generous spacing and clear headings. ALSO INSIDE A plain-English glossary of 36 AI terms, free to everyone A two-minute Daily Moment, plus the last three days if you missed one A gentle streak with a built-in grace day, and a bonus lesson at seven days A card worth sharing when you finish PRIVATE BY DESIGN No account. No tracking. Your progress stays on your device.
Screenshots
Verdict
The clearest difference is in-app purchases: PromptFluent at none against Plainly AI's 1. Plainly AI's advantage is update cadence (monthly vs every 3 months). On price, ads, device support and iOS requirement 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. Plainly AI sells 1 one-off in-app purchase. PromptFluent asks for nothing beyond the download.
PromptFluent ships an update every 3 months, Plainly AI monthly. The most recent releases landed on October 31, 2026 and October 24, 2026 respectively.
| Parameter | PromptFluent | Plainly AI |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 3 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 38 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | Floyd Piedad | Kristopher Anderson |
In-app purchases
PromptFluent
No in-app purchases
Plainly AI
- Unlock Full Library$4.99









