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, NotebookLM and Perplexity, the top three of 7 matches in our directory. 3 of the 7 picks are completely free and the other 4 have a free plan; 2 are open source.
Updated
Built with love by Shushant Lakhyani. Building bestproductivityresources.com
At a glance
Counted from the top 7 picks, except the total.
- Matching tools
- 7
- Completely free
- 3
- Open source
- 2
- 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 | NotebookLM | Free plan | Web, iOS, Android | — | A research assistant grounded only in the sources you give it. |
| 3 | Perplexity | Free plan | Web, iOS, Android, Chrome | — | Answer engine with sources for fast research. |
| 4 | Anki | Free | macOS, Windows, Linux, Android, iOS, Web | Open source | Spaced repetition flashcards that make learning stick. |
| 5 | Instapaper | Free plan | Web, iOS, Android, Chrome, Firefox, Safari | — | A long-running read-later app that saves unlimited articles for free. |
| 6 | Raindrop.io | Free plan | Web, Chrome, Firefox, Safari, iOS, Android, macOS, Windows | — | A bookmark manager that finally makes saved links useful. |
| 7 | wallabag | Free | Web, iOS, Android, Chrome, Firefox | Open source | A free, open-source read-it-later app you can host yourself. |
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, the highest here. Research is its main purpose in our directory. An iOS app that runs on iPhone and iPad and nowhere else. Its listing says it has AI features and is easy to pick up.
Watch out for: Currently only available on iOS
Number 2 of 7 for iPhone, rated 4.6/5. Research is its main purpose in our directory. Runs on iPhone and iPad, and also on Web and Android. Its listing says it syncs through the cloud, has AI features and is easy to pick up.
Watch out for: Only as good as the sources you upload
Number 3 of 7 for iPhone, rated 4.5/5. Research is its main purpose in our directory. Runs on iPhone and iPad, and also on Web, Android and Chrome. Its listing says it has AI features and is easy to pick up.
Watch out for: Still needs source checking
Number 4 of 7 for iPhone, rated 4.6/5. Listed mainly under Learning, it also covers research. Runs on iPhone and iPad, and also on macOS, Windows, Linux, Android and 1 more platform. Its listing says it works offline and is privacy-focused.
Watch out for: Unpolished interface
Number 5 of 7 for iPhone, rated 4.4/5. Listed mainly under Reading, it also covers research. Runs on iPhone and iPad, and also on Web, Android, Chrome, Firefox and 1 more platform. Its listing says it works offline, syncs through the cloud and is easy to pick up.
Watch out for: Free plan limits notes to 5 a month
Number 6 of 7 for iPhone, rated 4.6/5. Listed mainly under Organization, it also covers research. Runs on iPhone and iPad, and also on Web, Chrome, Firefox, Safari and 3 more platforms. Its listing says it syncs through the cloud and is easy to pick up.
Watch out for: Full-text search needs the paid plan
Number 7 of 7 for iPhone, rated 4.2/5. Listed mainly under Reading, it also covers research. Runs on iPhone and iPad, and also on Web, Android, Chrome and Firefox. Its listing says it is privacy-focused.
Watch out for: Self-hosting takes some setup
Running these on iPhone
Counted from each pick's listing type and platforms.
- By listing type, the 7 iPhone picks are 4 web apps (NotebookLM, Instapaper, Raindrop.io and wallabag), 1 AI tool (Perplexity), 1 desktop app (Anki) and 1 iOS app (Arc Search).
- 1 of 7 are apps you install on iPhone and iPad, and Arc Search is made specifically for iPhone; the other 6 are web or cloud tools listed for iPhone.
- Arc Search is listed for iPhone and nothing else. Raindrop.io reaches furthest, on 7 other platforms besides iPhone.
- 2 of 7 also run on a Mac, so the same tool can follow you between iPhone and Mac; Arc Search, NotebookLM, Perplexity, Instapaper and 1 other do not.
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, Anki and wallabag are completely free. NotebookLM, Perplexity, Instapaper and Raindrop.io have free plans with paid upgrades.
- Which of these research tools are open source?
- Anki and wallabag 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?
- Anki and Instapaper are listed as working offline. The others need an internet connection for at least some features.
- Which are easiest for beginners?
- Arc Search, NotebookLM and Perplexity are rated beginner-friendly, along with 2 other picks. 2 picks take more time to learn.
- How many free research tools for iPhone are in the directory?
- 7 match right now, and all of them are on this page. New tools are added as they are checked.
Keep exploring
Wider lists
Related free lists
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- Free calendar apps for iPhone
- Free habit-building apps for iPhone
- Free time management apps for iPhone
- Free writing apps for iPhone
- Free AI productivity tools for iPhone
- Free learning apps for iPhone
- Free email apps for iPhone
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