Comparison

Deep Research+ vs Persimmon

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

Head to head
About

Deep Research+

Features
Read full description

Tired of hitting paywalls and limitations when conducting deep research? Deep Research revolutionizes your research workflow with the power of cutting-edge AI, all at an unbelievably affordable price. Our unlimited subscription model unlocks a world of knowledge, allowing you to explore any topic in depth, without ever worrying about per-search fees or usage limits. Highlight Key Features and Benefits: Unlimited Deep Research. No more rationing your searches. Explore any topic as deeply as you need, as often as you need. Dive into complex subjects, analyze trends, and uncover hidden insights without restriction. AI-Powered Insights. Our advanced AI algorithms go beyond surface-level information. We synthesize data from diverse sources, identify key connections, and provide you with comprehensive, insightful analysis. Unbelievably Affordable Subscription. We believe deep research should be accessible to everyone. Our subscription is priced to be significantly more affordable than competing solutions, offering unparalleled value. Save Time and Effort. Stop wasting hours sifting through endless search results. Deep Research streamlines your process, delivering relevant information quickly and efficiently. User-Friendly Interface. Designed for ease of use, Deep Research is intuitive and straightforward, even for complex research tasks. The Terms of Use: https://kindintheshell.com/terms

About

Persimmon

This app simplifies complex scientific research papers from arXiv and SocArXiv using AI. It offers customizable summaries tailored to your expertise level and allows you to search, save, and get daily updates on new publications. You can also use it as a basic preprint browser without AI.

Highlights
  • AI-powered paper summaries
  • Customizable AI models and expertise levels
  • Search arXiv and SocArXiv
  • Save papers for offline access
  • Daily updates and notifications
  • Privacy-focused, no data collection
Features
Read full description

Welcome to Persimmon, the ultimate AI-assisted research exploration tool for iOS! In a world where scientific breakthroughs are accelerating faster than ever but many struggle to keep pace, Persimmon bridges the gap between cutting-edge research and everyday understanding. Designed for researchers, scientists, students, and anyone with a passion for discovery, the app transforms complex arXiv and SocArXiv paper abstracts into digestible, tailored insights using the language models of your choice. Whether you’re diving into machine learning, quantum computing, or macroeconomic trends, Persimmon makes research accessible, engaging, and available at your fingertips. Why Persimmon? The sheer volume of scientific research published today is staggering. Thousands of papers flood leading preprint servers like arXiv and SocArXiv each week, making it nearly impossible to stay informed without specialized knowledge. At the same time, scientific literacy is declining, with many people feeling disconnected from the innovations shaping our future. Persimmon tackles these challenges head-on by simplifying the process of exploring, understanding, and saving research papers – no PhD required! Key Features: - Customizable AI Summaries: Choose your preferred OpenAI-compatible language model (LLM) to generate summaries. Control costs and model preferences with your own API configurations. - Switch Between Providers: Seamlessly toggle between multiple LLM providers (e.g., OpenAI, Mistral, DeepSeek, Claude, custom models) using secure, on-device saved settings. - Tailored to Your Level: Set your expertise level (beginner, intermediate, or expert) for each topic to receive summaries that match your understanding. - arXiv & SocArXiv Search Made Easy: Find papers instantly with full-text search across arXiv and SocArXiv. Filter by categories to discover what interests you. - Offline Access: Save your favorite papers to read without an internet connection. - Daily Updates: Never miss a breakthrough! Get automatic notifications for the latest arXiv and SocArXiv papers in your chosen fields. - Privacy First: Persimmon respects your privacy. There’s no data collection, tracking, or analytics. - Breezy Performance: Built entirely in SwiftUI with minimal dependencies, Persimmon is snappy, intuitive, and optimized for iOS. - AI-Optional: Prefer raw data? Use Persimmon as a no-frills preprint browser. How It Works: 1. Set Your Interests: Select arXiv/SocArXiv categories or topics that fascinate you. 2. Choose Your AI Model: Configure your preferred LLM and expertise level to personalize summaries. 3. Explore & Save: Dive into abstracts, search papers, or save key findings for offline access. 4. Stay Informed: Get daily notifications to keep up with the latest advancements in your field. Privacy & Control: We believe knowledge should be private and empowering. Persimmon stores all configurations and preferences securely on your device – accounts are absolutely not required. Optional cloud syncing of preferences is available via Persimmon Cloud. Your exploration stays yours. Persimmon is completely free to use, with a setup time under 30 seconds. At best, it becomes your go-to tool for staying ahead of the curve. At worst, you’ve got a sleek, private browser for preprints. Either way, we’re excited to help you unlock the world of research. Join the movement to make science accessible to all. Download Persimmon now and start exploring the future of knowledge – one paper at a time.

Screenshots

Deep Research+4 screens
Persimmon4 screens

Verdict

The call

The clearest difference is in-app purchases: Persimmon at none against Deep Research+'s 2. On price, update cadence, ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Deep Research+ sells 2 in-app purchases, starting at $7.99 per month. Persimmon asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 27, 2026 and June 11, 2026 respectively.

Scorecard1 real difference · 8 level
Deep Research+ versus Persimmon: the parameters behind the verdict, then further details
ParameterDeep Research+Persimmon
PriceFreeFree
Rating—5.0 (2 ratings) — better
Number of ratings—2 — better
Update frequencyEvery 3 weeksEvery 3 weeks
AdsNoNo
In-app purchasesYesNo — better
Monetization—Free
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.218.1 — better
Further details — not scored
Size15 MB23 MB
Age rating4+12+
DeveloperIvan KhaustovMomenta Lab LLC

In-app purchases

2 purchases

Deep Research+

Subscriptions2
  • Free week trial subscription7 Days trial$7.991 Month
  • Free month trial subscription1 Month trial$49.991 Year
None

Persimmon

No in-app purchases

Questions

Is Deep Research+ free?
Deep Research+ is free to download, with in-app purchases available.
Is Persimmon free?
Persimmon is free to download, with no in-app purchases.
Do Deep Research+ or Persimmon have ads?
Neither Deep Research+ nor Persimmon shows ads.
Which is updated more often, Deep Research+ or Persimmon?
Deep Research+ ships an update every 3 weeks, and Persimmon every 3 weeks. Most recently, Deep Research+ was updated on September 27, 2026 and Persimmon on June 11, 2026.

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