Astra AI records 7,356,157 monthly visits with +40.3% month-over-month growth and Freemium, Paid pricing. Paperguide records 371,972 monthly visits with -2.9% growth and Freemium pricing.
Your personal AI tutor for every subject, from notes to exam day.
AI-native workspace for literature reviews and auditable systematic reviews
| Dimension / Metric | | |
|---|---|---|
| Official Domain | astra-ai.co | paperguide.ai |
| Pricing Model | Freemium, Paid | Freemium |
| Monthly Visits | 7.36M (7,356,157) | 371.97K (371,972) |
| MoM Traffic Delta | +2.11M (+40.3%) | -11.05K (-2.9%) |
| Primary Market & Share | 🇻🇳 Vietnam (14.3%) | 🇺🇸 United States (25.6%) |
| Direct Visits / mo | 2.36M | 121.59K |
| User Rating | 4.3 | 4.4 |
| Supported Platforms | Website | Website |
Your personal AI tutor for every subject, from notes to exam day.
Upload your notes, slides or past papers, set your exam date and target grade, and Astra assembles a topic-by-topic revision plan built around exactly what you'll be tested on.
Ask by typing, speaking or snapping a photo. The tutor explains concepts at your level, asks follow-up questions and keeps going until the idea actually clicks.
Generate guided lessons, flashcards, quizzes, true/false and smart-text exercises, plus an auto-generated podcast so every learning style is covered.
Practise with realistic oral and timed written mock exams that get graded, so you know where you stand before the real thing.
AI-native workspace for literature reviews and auditable systematic reviews
Ask a research question in plain language and get a synthesized answer drawn from PubMed, arXiv, OpenAlex and Semantic Scholar, with every claim linked to its source paper.
Run PRISMA-style reviews with a predefined protocol, recorded screening decisions, dual independent reviewers and a conflict resolver, and a PRISMA diagram generated from your actual counts.
Import from Zotero or Mendeley, add papers by DOI, and get metadata and open-access PDFs fetched automatically, with annotations and notes that feed every other workflow.
Define custom extraction columns and have AI fill them across many papers, with each value linking back to the sentence it came from, exportable to CSV or Excel.
SpecialistGeneral conversational AI workspace capable of deep reasoning, tutoring, and generating custom study plans.
SpecialistGeneral conversational AI workspace capable of deep reasoning, tutoring, and generating custom study plans.
AI study app that converts notes, PDFs, and videos into interactive flashcards and gamified quizzes.
AI study app that converts notes, PDFs, and videos into interactive flashcards and gamified quizzes.
Free / Open-sourceA free, AI-powered academic search engine for 240M+ papers across every scientific field
Free / Open-sourceA free, AI-powered academic search engine for 240M+ papers across every scientific field
SpecialistSuperior for quick evidence-based academic search, but less of a comprehensive writing and reference suite.
SpecialistSuperior for quick evidence-based academic search, but less of a comprehensive writing and reference suite.
All-in-one student study platform that solves homework problems, predicts exams, and generates custom flashcards.
All-in-one student study platform that solves homework problems, predicts exams, and generates custom flashcards.
Offers robust PDF analysis and literature search workspaces, but lacks advanced systematic review screening workflows.
Offers robust PDF analysis and literature search workspaces, but lacks advanced systematic review screening workflows.
Free study platform that automatically generates flashcards and practice tests from your lecture notes and files.
Free study platform that automatically generates flashcards and practice tests from your lecture notes and files.
SpecialistInteractive learning platform teaching math and science through hands-on visual puzzles and guided AI tutoring.
SpecialistOnline exam preparation platform combining course study materials with an interactive AI study tutor.
SpecialistOnline exam preparation platform combining course study materials with an interactive AI study tutor.
Stronger automated evidence synthesis and systematic review extraction, but less focused on end-to-end reference management.
Stronger automated evidence synthesis and systematic review extraction, but less focused on end-to-end reference management.
AI learning platform that turns course materials into interactive flashcards, quizzes, study notes, and video explainers.
AI learning platform that turns course materials into interactive flashcards, quizzes, study notes, and video explainers.
Stronger AI academic writing and autocomplete assistance, but less comprehensive for systematic literature mapping.
Stronger AI academic writing and autocomplete assistance, but less comprehensive for systematic literature mapping.
