Free picks · iPhone
Best free research tools for iPhone (2026)
Every pick is listed under Research in our directory, runs on iPhone and iPad and is completely free or has a free plan. We rank them by our rating and popularity, then favour tools made mainly for research and apps built for iPhone.
Short answer
The best free research tools for iPhone are Arc Search, Zotero and Wolfram|Alpha, the top three of 19 matches in our directory. 5 of the 10 picks are completely free and the other 5 have a free plan; 3 are open source.
Updated
Built with love by Shushant Lakhyani. Building bestproductivityresources.com
At a glance
Counted from the top 10 picks, except the total.
- Matching tools
- 19
- Completely free
- 5
- Open source
- 3
- Work offline
- 2
- Native apps
- 1
Comparison table
“Free plan” means a free tier with paid upgrades. A dash in Licence means our directory does not list the tool as open source.
| # | Name | Pricing | Platforms | Licence | Why pick it |
|---|---|---|---|---|---|
| 1 | Arc Search | Free | iOS | — | The internet, summarized for you. |
| 2 | Zotero | Free | Windows, macOS, Linux, iOS, Chrome, Firefox, Safari | Open source | A free, open-source tool to collect, organise and cite your research. |
| 3 | Wolfram|Alpha | Free plan | Web, iOS, Android | — | A computational knowledge engine that answers questions with data. |
| 4 | NotebookLM | Free plan | Web, iOS, Android | — | Google's research assistant, now called Gemini Notebook, grounded in your own sources. |
| 5 | Perplexity | Free plan | Web, iOS, Android, Chrome | — | Answer engine with sources for fast research. |
| 6 | DuckDuckGo | Free plan | Windows, macOS, Android, iOS, Web | — | A free private browser and search engine that blocks trackers by default. |
| 7 | Desmos | Free | Web, iOS, Android | — | A free online graphing calculator for students, teachers and curious minds. |
| 8 | NetNewsWire | Free | macOS, iOS | Open source | A free, open-source RSS reader for Mac, iPhone and iPad. |
| 9 | Linkwarden | Free | Web, iOS, Android, Chrome, Firefox, Safari | Open source | A self-hosted bookmark manager that saves a full copy of every page. |
| 10 | Windy | Free plan | Web, iOS, Android | — | A detailed live weather map with forecasts, radar and wind layers. |
Why each pick made the list
Every reason is taken from the tool's own listing: its categories, platforms, features, rating and pricing.
Our top iPhone pick, rated 4.6/5. Made mainly for research, one of 6 such picks here. An iOS app that runs on iPhone and iPad and nowhere else. Its listing says it has AI features (6 of 10 here) and is easy to pick up (8 of 10 here).
Watch out for: Currently only available on iOS
Number 2 of 10 for iPhone, rated 4.8/5, the highest here. Made mainly for research, one of 6 such picks here. Runs on iPhone and iPad, and also on Windows, macOS, Linux, Chrome and 2 more platforms. Its listing says it works offline (2 of 10 here), syncs through the cloud (4 of 10 here) and is easy to pick up (8 of 10 here).
Watch out for: Free cloud storage for PDFs is limited to 300 MB
Number 3 of 10 for iPhone, rated 4.7/5. Made mainly for research, one of 6 such picks here. Runs on iPhone and iPad, and also on Web and Android. Its listing says it has AI features (6 of 10 here) and is easy to pick up (8 of 10 here).
Watch out for: Step-by-step solutions need Pro
Number 4 of 10 for iPhone, rated 4.6/5. Made mainly for research, one of 6 such picks here. Runs on iPhone and iPad, and also on Web and Android. Its listing says it syncs through the cloud (4 of 10 here), has AI features (6 of 10 here) and is easy to pick up (8 of 10 here).
Watch out for: Only as good as the sources you upload
Number 5 of 10 for iPhone, rated 4.5/5. Made mainly for research, one of 6 such picks here. Runs on iPhone and iPad, and also on Web, Android and Chrome. Its listing says it has AI features (6 of 10 here) and is easy to pick up (8 of 10 here).
Watch out for: Still needs source checking
Number 6 of 10 for iPhone, rated 4.6/5. Made mainly for research, one of 6 such picks here. Runs on iPhone and iPad, and also on Windows, macOS, Android and Web. Its listing says it is privacy-focused (3 of 10 here), has AI features (6 of 10 here) and is easy to pick up (8 of 10 here).
Watch out for: The VPN and advanced AI models need a subscription
Number 7 of 10 for iPhone, rated 4.8/5. Made mainly for learning, it is one of 4 picks here that cover research as a second use. Runs on iPhone and iPad, and also on Web and Android. Its listing says it syncs through the cloud (4 of 10 here) and is easy to pick up (8 of 10 here).
Watch out for: The web version needs an internet connection
Number 8 of 10 for iPhone, rated 4.7/5. Made mainly for reading, it is one of 4 picks here that cover research as a second use. Runs on iPhone and iPad, and also on macOS. Its listing says it works offline (2 of 10 here), syncs through the cloud (4 of 10 here) and is privacy-focused (3 of 10 here).
Watch out for: Apple devices only
Number 9 of 10 for iPhone, rated 4.7/5. Made mainly for organization, it is one of 4 picks here that cover research as a second use. Runs on iPhone and iPad, and also on Web, Android, Chrome, Firefox and 1 more platform. Its listing says it is privacy-focused (3 of 10 here) and has AI features (6 of 10 here).
Watch out for: Self-hosting needs a server and some setup
Number 10 of 10 for iPhone, rated 4.7/5. Made mainly for personal productivity, it is one of 4 picks here that cover research as a second use. Runs on iPhone and iPad, and also on Web and Android.
Watch out for: Busy for casual users
Running these on iPhone
Counted from each pick's listing type and platforms.
- By listing type, the 10 iPhone picks are 5 web apps (NotebookLM, DuckDuckGo, Desmos, Linkwarden and 1 other), 2 AI tools (Wolfram|Alpha and Perplexity), 2 desktop apps (Zotero and NetNewsWire) and 1 iOS app (Arc Search).
- 1 of 10 are apps you install on iPhone and iPad, and Arc Search is made specifically for iPhone; the other 9 are web or cloud tools listed for iPhone.
- Arc Search is listed for iPhone and nothing else. Zotero reaches furthest, on 6 other platforms besides iPhone.
- 3 of 10 also run on a Mac, so the same tool can follow you between iPhone and Mac; Arc Search, Wolfram|Alpha, NotebookLM, Perplexity and 3 others do not.
More matches
9 more free research tools for iPhone in our directory, in ranked order.
Frequently asked questions
- What is the best free research tool for iPhone?
- Arc Search is our first pick. The internet, summarized for you. Yes. Arc Search is free to use.
- Are these research tools really free?
- Yes, every pick is free to start. Arc Search, Zotero, Desmos, NetNewsWire and 1 other are completely free. Wolfram|Alpha, NotebookLM, Perplexity, DuckDuckGo and 1 other have free plans with paid upgrades.
- Which of these research tools are open source?
- Zotero, NetNewsWire and Linkwarden are tagged open source in our directory, so you can read the code of each and, depending on the licence, self-host or modify it.
- Which ones work offline on iPhone and iPad?
- Zotero and NetNewsWire are listed as working offline. The others need an internet connection for at least some features.
- Which are easiest for beginners?
- Arc Search, Zotero and Wolfram|Alpha are rated beginner-friendly, along with 5 other picks. 2 picks take more time to learn.
- How many free research tools for iPhone are in the directory?
- 19 match: listed under Research, available on iPhone and iPad and free to start. This page ranks the top 10 and names up to 20 more under More matches. The Research category page has every listing, paid ones included.
Keep exploring
Wider lists
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