Research & search · alternatives
Apodex asks you to sign in before you can ask a question, so you cannot try it first. Credit costs are dynamic rather than fixed per request, which makes it hard to budget per report. There is no public price list on the pricing page, with plans visible only after sign-in, and Premium resets credits each month.
Perplexity is an answer engine that searches the web and replies with cited sources; the listed plan is Education Pro at $10 per month for verified students and faculty, and a free plan exists. ChatGPT Plus is $20 per month, with a free plan, for general research and writing. Claude Pro is $20 per month, or $17 per month on an annual subscription, with a free plan. Gemini Notebook answers from your own sources, free to use, with no price in our pack. Perplexity is the closest to cited research.
"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.
Taken from the documented limitations in our Apodex profile.
| Tool | Starting price | Free tier | Platforms | Main limitation |
|---|---|---|---|---|
| Apodex (this page) | $50/mo (Premium) | Yes | Web, API | Credit cost per question is dynamic, so spend per report cannot be predicted from the pricing page. |
| 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'. |
| ChatGPT | $20/mo (Plus (consumer)) | Yes | Web, Desktop, Mobile, API | Almost every tool (uploads, images, voice, deep research, Codex) has plan-dependent usage caps that OpenAI states can change over time, and the API is billed separately from every ChatGPT subscription. |
| Claude | $20/mo (Pro) | Yes | Web, Desktop, Mobile, API | All plans have usage limits that reset on a schedule; the paid chat subscription does not include API access, which is billed separately per token. |
| 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. |
| Alternative | Pick it when | Starting price | Watch out for |
|---|---|---|---|
| Perplexity |
$10/mo (Education Pro (consumer, verified students/faculty)) | ||
| ChatGPT |
$20/mo (Plus (consumer)) | ||
| Claude |
$20/mo (Pro) | ||
| Gemini Notebook (formerly NotebookLM) |
Not published |
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
OpenAI's general-purpose AI assistant for writing, research, analysis, image generation and coding help.
Free stops at: Unlimited everyday text chats subject to abuse-prevention safeguards, Separate usage limits for file uploads,…
Free · paid from $20/mo US · checked Sep 30
Anthropic's AI assistant for writing, analysis, coding and multi-step work, with free and paid plans.
Free stops at: Usage limits apply, Projects: up to 5
Free · paid from $20/mo US · checked Sep 30
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
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
Perplexity, ChatGPT, Claude and Gemini Notebook each list a free option.
Sign-in before asking, dynamic credit costs, and plans visible only after sign-in.
Perplexity Education Pro is $10 per month, ChatGPT Plus and Claude Pro are $20. Gemini Notebook has no stated price.
Perplexity replies with cited sources after searching the web.
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