Research & search · alternatives
KeepFlash's Free plan fills up quickly: 150 notes, 2 spaces, 500MB and 200 credits a month. Semantic search and PDF export need Plus or Pro, AI use burns monthly credits, and the capture extension is confirmed only for Chrome, which matters if you clip pages from another browser.
Gemini Notebook (formerly NotebookLM) is Google's research partner that answers from your own sources and makes summaries, audio and slides; it has a free tier and no starting price is stated in our data. Notion AI starts at Plus, $12 per member per month, and keeps notes, search and AI in one workspace, with a free tier. Perplexity searches the web and cites sources rather than storing your library; its listed price is Education Pro (consumer, verified students/faculty) at $10 per user per month, and it has a free tier.
"Better suited" below is based on documented features and pricing from our verified profiles, not on a head-to-head test. Prices are USD as published by each vendor.
Our own captures of each vendor's public pages. Click a frame for the full-size image.
Taken from the documented limitations in our KeepFlash profile.
| Tool | Starting price | Free tier | Platforms | Main limitation |
|---|---|---|---|---|
| KeepFlash (this page) | $7.99/mo (Plus) | Yes | Web | Free plan is capped at 150 notes, 2 spaces, 500MB storage and 200 credits per month; semantic search and PDF export need Plus or Pro. |
| Gemini Notebook (formerly NotebookLM) | Not published | Yes | Web, Mobile | Free tier has standard usage limits and 50 sources per notebook; higher limits need a Google AI Plus, Pro or Ultra plan, which Google says are only available in specific regions. |
| Notion AI | $12/mo (Plus) | Yes | Web, Desktop, Mobile | Full AI needs Business or Enterprise, and even there a rolling six-hour and monthly usage allowance applies; premium models, Custom Agents and Workers consume separately purchased Notion credits. |
| Perplexity | $10/mo (Education Pro (consumer, verified students/faculty)) | Yes | Web, API | The consumer pricing page is blocked to automated checks, so the Pro price could not be confirmed here, and free-tier Pro Search and Research access are described only as 'very limited' / 'limited'. |
| Alternative | Pick it when | Starting price | Watch out for |
|---|---|---|---|
| Gemini Notebook (formerly NotebookLM) |
Not published | ||
| Notion AI |
$12/mo (Plus) | ||
| Perplexity |
$10/mo (Education Pro (consumer, verified students/faculty)) |
Google's AI research partner that answers questions and creates summaries, audio and slides grounded in your own sources.
Free stops at: Standard limits for chat and generation of Slides, Audio Overviews and other artifacts, Up to 50 sources per …
Verified notebook.google (opens Gemini Notebook (formerly NotebookLM) website in a new tab)
Free plan available US price unconfirmed
AI features built into Notion for writing, searching the workspace, research, meeting notes and agent tasks.
Free stops at: Trial of Notion AI (limited number of complimentary AI responses), Pages & blocks unlimited for individuals, …
Free · paid from $12/mo US · checked Sep 30
AI answer engine that searches the web and replies with cited sources, plus developer search APIs.
Free stops at: Practically unlimited basic searches, Very limited amount of Pro Searches
Verified perplexity.ai (opens Perplexity website in a new tab)
Free · paid from $10/mo US · checked Sep 30
Data API for AI agents delivering web content and e-commerce intelligence as clean JSON, with historical data and a credit-based pricing model.
Free stops at: Basic rate limits: 30 RPM, 5 concurrent, No credit card required
Free plan available US price unconfirmed
Mobile AI agent that tracks topics you name, folds duplicate coverage into single briefings and alerts you only when something changes.
Watch out: The site publishes no pricing, no web version is shown (mobile app only), and the privacy and docs pages are …
Pricing US price unconfirmed
Social data API and MCP server giving AI agents access to Twitter/X, Instagram, TikTok and Reddit posts.
Free stops at: 500 credits one-time, 1 tracked keyword/user
Free · paid from $16/mo (billed annually) US · checked Sep 29
Web resource to compare LLMs by benchmarks, price, speed and context window.
Watch out: Its comparison data comes from Artificial Analysis, so rankings depend on that third-party source, and no pri…
Verified whatllm.org (opens WhatLLM.org website in a new tab)
Pricing US price unconfirmed
YouTube analytics platform showing real CPM and RPM from a connected channel, plus competitor tracking and AI content ideas.
Watch out: The 7-day trial requires a payment card and Starter covers one channel with 90 days of history and no revenue…
Verified tubeanalytics.net (opens TubeAnalytics website in a new tab)
From $19/mo US · checked Sep 29
Cookie-free, GDPR-oriented web analytics service from Germany with a 30-day free trial.
Free stops at: 25,000 page views, 1 website
Verified trackboxx.com (opens Trackboxx website in a new tab)
Pricing US price unconfirmed
Free is capped at 150 notes and 2 spaces, semantic search needs a paid plan, and the extension is confirmed only for Chrome.
Gemini Notebook (formerly NotebookLM); it is marked as having a free tier but no starting price is stated.
Notion AI Plus is $12 per member per month. KeepFlash Plus is $7.99 per month billed monthly.
Yes, Gemini Notebook, Notion AI and Perplexity are marked as having a free tier.
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