Comparison

AI Prompt Modifier vs ContextStacker

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

Head to head
About

AI Prompt Modifier

Features
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### Transform Your AI Interactions with AI Prompt Modifier The AI Prompt Modifier extension enhances AI interactions by allowing you to customize, save, and manage prompt templates easily. Improve productivity with seamless modifications and tailored responses across multiple AI models. ### Key Features - Seamless Prompt Customization โ€“ Add prefixes and suffixes to streamline responses - Group Management โ€“ Organize and access prompt modifications easily - Import and Export โ€“ Share your custom prompt groups or sync settings across devices - Undo Modifications โ€“ Revert to the original prompt with one click - User Friendly Interface โ€“ Clean and intuitive design for quick customization Now Supporting More AI Models Works with ChatGPT, DeepSeek Chat, DeepAI Chat, Google Gemini, Meta AI, Claude AI, Perplexity AI, Hugging Face Chat, YouChat, Poe by Quora, Pi by Inflection AI, and Kuki AI Upgrade your AI experience today with AI Prompt Modifier

About

ContextStacker

Features
Read full description

ContextStacker brings your workspace knowledge into one focused chat. Sign in with the same account you use on the web, then ask questions across readable documents and enabled API resources in your workspace. Answers stream as they are generated, support Markdown, and include source references so you can understand where the information came from. KEY FEATURES โ€ข Ask across your entire workspace without choosing a single document โ€ข Continue conversations shared with the ContextStacker web app โ€ข Receive streamed answers with Markdown formatting โ€ข Review document and API sources behind each answer โ€ข Start new conversations and revisit chat history โ€ข Switch workspaces and manage your account โ€ข View your current plan and usage Use the web app to add or manage documents and API resources or invite members. Workspace owners and billing managers can subscribe to Pro Annual or Business Annual in the iOS app. Each plan clearly shows its annual price and included services before purchase. ContextStacker supports English, Simplified Chinese, and Japanese. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

AI Prompt Modifier4 screens
ContextStacker4 screens

Verdict

The call

The clearest difference is in-app purchases: AI Prompt Modifier at none against ContextStacker's 2. AI Prompt Modifier also leads on device support (4 vs 2) and iOS requirement (15.0 vs 17.0). ContextStacker's advantage is update cadence (every 3 days vs monthly). On price and ads there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. ContextStacker sells 2 in-app purchases, starting at $99.00 per year. AI Prompt Modifier asks for nothing beyond the download.

UpkeepUpdate frequency

AI Prompt Modifier ships an update monthly, ContextStacker every 3 days. The most recent releases landed on September 28, 2026 and October 14, 2026 respectively.

Scorecard4 real differences ยท 2 level
AI Prompt Modifier versus ContextStacker: the parameters behind the verdict, then further details
ParameterAI Prompt ModifierContextStacker
PriceFreeFree
Update frequencyMonthlyEvery 3 days โ€” better
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPad, iPod, Mac โ€” betteriPhone, iPad
Requires iOS15.0 โ€” better17.0
Further details โ€” not scored
Size4 MB7 MB
Age rating4+4+
DeveloperWindmillcode LLC้นๆบ ้‚ฑ

In-app purchases

None

AI Prompt Modifier

No in-app purchases

2 purchases

ContextStacker

Subscriptions2
  • Pro Annual$99.001 Year
  • Business Annual$199.001 Year

Questions

Is AI Prompt Modifier free?
AI Prompt Modifier is free to download, with no in-app purchases.
Is ContextStacker free?
ContextStacker is free to download, with in-app purchases available.
Do AI Prompt Modifier or ContextStacker have ads?
Neither AI Prompt Modifier nor ContextStacker shows ads.
Which is updated more often, AI Prompt Modifier or ContextStacker?
AI Prompt Modifier ships an update monthly, and ContextStacker every 3 days. Most recently, AI Prompt Modifier was updated on September 28, 2026 and ContextStacker on October 14, 2026.

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