1. Home
  2. Topics
  3. Complexity AI

Best Complexity AI Apps

250+ iOS apps curated and reviewed

4.7 avg rating
20 free apps
Updated September 2026

From beginner-friendly picks to power-user tools, our complexity ai list covers 250+ iPhone apps updated through September 2026. Compare ratings, prices, and screenshots in one place.

Compare top Complexity AI Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Perplexity - AI Search & ChatPerplexity - AI Search & ChatFree4.8β˜… (506K)NoYesSep 2026
2DeepSeek - AI AssistantDeepSeek - AI AssistantFree4.0β˜… (11K)NoNoSep 2026
3Klok AIKlok AIFree5.0β˜… (2)YesNoSep 2026
4Lloyd - Your AI SuperpowerLloyd - Your AI SuperpowerFree4.5β˜… (24K)YesYesSep 2026
5AI SimplifierAI SimplifierFreeβ€”NoYesJul 2026
6TreeGPT: Tree Planting AITreeGPT: Tree Planting AIFree5.0β˜… (5)NoYesSep 2026
7Ai - open source AI AssistantAi - open source AI AssistantFree was $1.99β€”NoNoSep 2026
8raia AIraia AIFreeβ€”NoNoMay 2026

Top Picks for Complexity AI

Perplexity - AI Search & Chat#1

Perplexity - AI Search & Chat by Perplexity AI, Inc.

Ask. Research. Trusted Answers
Editor's Choice
πŸ“Š Productivity
4.8😊(506K ratings)
FreeIn-App Purchases
#6in Productivity
Perplexity - AI Search & Chat screenshot 1
Perplexity - AI Search & Chat screenshot 2
Perplexity - AI Search & Chat screenshot 3
Perplexity - AI Search & Chat screenshot 4
Perplexity - AI Search & Chat screenshot 5
Perplexity - AI Search & Chat screenshot 6

Get accurate, source-backed answers to any question with this AI-powered search and chat tool. It leverages top AI models for deep research, drafting emails, and more, syncing across devices. Discover new information and organize your findings in a personal library.

What We Love

  • πŸš€ Saves time, fast and efficient
  • πŸ” Comprehensive and detailed answers
  • πŸ“š Provides sources and citations
  • πŸ€– Excellent AI-powered search
  • 🧠 Helpful for research and learning
  • πŸ”’ Accurate mathematical and technical information
  • 🀝 Personalized and contextual responses

Room to Improve

  • πŸ› Occasional bugs and glitches
  • πŸ”’ Restrictions on VPN usage
  • πŸ’° Expensive subscription
  • πŸ€– Inconsistent or biased responses
  • πŸ–₯️ Subpar mobile app experience compared to web version
DeepSeek - AI Assistant#2

DeepSeek - AI Assistant by ζ­ε·žζ·±εΊ¦ζ±‚η΄’δΊΊε·₯ζ™Ίθƒ½εŸΊη‘€ζŠ€ζœ―η ”η©Άζœ‰ι™ε…¬εΈ

Intelligent AI Assistant
Strong Contender
πŸ“Š Productivity
4.0😊(11K ratings)
Free
#38in Productivity
DeepSeek - AI Assistant screenshot 1
DeepSeek - AI Assistant screenshot 2
DeepSeek - AI Assistant screenshot 3
DeepSeek - AI Assistant screenshot 4
DeepSeek - AI Assistant screenshot 5

This AI assistant offers free, intelligent help powered by a cutting-edge model. It provides rapid responses and advanced capabilities to enhance problem-solving and daily efficiency.

What We Love

  • πŸš€ Fast and responsive
  • πŸ‘ User-friendly interface
  • πŸ’‘ Powerful AI capabilities
  • πŸ€– Impressive reasoning and thought process
  • πŸ’° Free and open-source

Room to Improve

  • πŸ€– Censorship and bias in responses
  • πŸ”Œ Server overload and slow response times
  • πŸ”’ Privacy concerns regarding data collection
  • πŸ› Occasional bugs and crashes
Klok AI#3

Klok AI by AROHA LABS PTE. LTD.

Worth Considering
πŸ“Š Productivity
5.0(2 ratings)
FreeAds
Klok AI screenshot 1
Klok AI screenshot 2
Klok AI screenshot 3
Klok AI screenshot 4

Access multiple AI models optimized for various tasks through a single, intuitive interface. This app remembers your preferences and adapts to your style, offering specialized AIs for speed, creativity, complex problem-solving, and data analysis. Widgets provide quick access to your favorite tools, enhancing productivity and creativity.

More Complexity AI apps to explore

FAQ about Complexity AI

What are the best complexity ai apps for iPhone?
Perplexity - AI Search & Chat tops our complexity ai apps ranking as of September 2026, with a 4.8-star average from 506K App Store ratings, and it's free to download.
Yes β€” 20 of the top complexity ai apps we rank are free to download, including Perplexity - AI Search & Chat and DeepSeek - AI Assistant.
Perplexity - AI Search & Chat has no ads and offers in-app purchases, according to its App Store listing as of September 2026.
We track 250+ complexity ai apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
This app provides accurate answers to any question, backed by sources and citations. It leverages advanced AI models for deep research, allows for conversational follow-ups, and includes an AI assistant for tasks like drafting emails and scheduling.
Key features include AI-powered search with cited sources, guided deep research, thread follow-ups for deeper understanding, an AI assistant for various tasks, voice search, and a personal library to curate discoveries.