Comparison

Prompt Keyboard vs Cortex

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

Head to head
About

Prompt Keyboard

Features
Read full description

Prompt Keyboard: AI Paste helps you save, build, organize, and paste better AI prompts anywhere you type. Stop rewriting the same prompts again and again. Keep your best instructions, templates, quick replies, and writing workflows in one clean prompt library, then insert them from a custom keyboard whenever you need them. Use it for AI chats, writing, coding, marketing, study notes, emails, support replies, image prompts, brainstorming, and daily productivity. KEY FEATURES Save Your Best Prompts Create a reusable library of prompts, instructions, templates, and text snippets for the work you repeat every day. Paste From the Keyboard Switch to Prompt Keyboard in any app, choose a saved prompt, and insert it into the active text field without digging through notes or old conversations. Prompt Templates Create flexible prompt templates with variables like topic, tone, language, platform, or output format. Fill Before You Paste For templates with variables, fill in the changing parts first, preview the final prompt, then paste a clean result. Built-In Prompt Packs Start faster with ready-to-use prompt ideas for writing, coding, marketing, email, study, translation, business, social media, productivity, and more. Local Prompt Builder Turn a simple idea into a structured prompt using guided fields such as goal, tone, topic, context, and output format. Prompt Enhancer Improve rough prompts into clearer, more useful instructions with local template-based enhancement. Organize Everything Use categories, favorites, recent prompts, search, and tags to keep your prompt library fast and easy to navigate. PRIVATE BY DESIGN Prompt Keyboard is built with a local-first privacy approach. • Your prompts are stored locally on your device • No account is required • The keyboard does not collect what you type • The keyboard does not send your keyboard input to any server • Full Access is only used to read your saved prompts from this app Prompt Keyboard is made for creators, developers, students, marketers, writers, founders, support teams, and anyone who uses AI tools every day. Save better prompts. Build better templates. Paste faster anywhere.

About

Cortex

Features
Read full description

Cortex is a private, local-first Markdown workspace for iPhone and iPad. Your notes are real files you control, with fast editing, links, search, and on-device intelligence. CORE FEATURES - Create and organize plain Markdown notes - Daily notes, tasks, templates, links, and backlinks - Keyword search, Smart Search, knowledge graph, and canvas - Save text and links from other apps with the Share Extension - Create, search, and summarize notes with App Shortcuts and Siri - Import, backup, and export your vault - Use Apple Speech for dictation in supported languages FREE - A complete local Markdown vault - Smart Search and knowledge graph - Encrypted notes - Basic dictation - Local attachments up to 5 MB - Import, backup, and export CORTEX PLUS - End-to-end encrypted sync across devices - Ask, Recall, Insights, and semantic Connections - Advanced dictation commands - On-device OCR and audio transcription - Attachments larger than 5 MB Cortex requires no account and contains no ads or tracking. AI inference and embeddings run on your device. If you enable sync, Cortex encrypts your notes before sending authenticated ciphertext to the managed relay or a relay you configure; the relay cannot read note contents. Terms of Use: https://cortex.jtrlabs.com/legal/terms.html Privacy Policy: https://cortex.jtrlabs.com/legal/privacy.html

Screenshots

Prompt Keyboard3 screens
Cortex3 screens

Verdict

The call

The clearest difference is in-app purchases: Prompt Keyboard at none against Cortex's 3. Cortex's advantage is device support (4 vs 1) and iOS requirement (15.0 vs 17.6). On price and ads 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. Cortex sells 3 in-app purchases, starting at $4.99 per month. Prompt Keyboard asks for nothing beyond the download.

Scorecard3 real differences · 3 level
Prompt Keyboard versus Cortex: the parameters behind the verdict, then further details
ParameterPrompt KeyboardCortex
PriceFreeFree
Update frequency—Every 3 days
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhoneiPhone, iPad, iPod, Mac — better
Requires iOS17.615.0 — better
Further details — not scored
Size11 MB131 MB
Age rating4+4+
DeveloperHa Do Thi ThuJTR Labs LLC

In-app purchases

None

Prompt Keyboard

No in-app purchases

3 purchases

Cortex

Subscriptions2
  • Cortex Plus (Monthly)$4.991 Month
  • Cortex Plus (Yearly)$39.991 Year
One-time1
  • Cortex Believer$99.99

Questions

Is Prompt Keyboard free?
Prompt Keyboard is free to download, with no in-app purchases.
Is Cortex free?
Cortex is free to download, with in-app purchases available.
Do Prompt Keyboard or Cortex have ads?
Neither Prompt Keyboard nor Cortex shows ads.

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