Moonlight review (2026): is the free plan enough?
AI reader for research papers with explanations and translation
Black Friday: is there a Moonlight sale?
Moonlight report card
Fair · out of 4.0 · graded Nov 12, 2026
Best for reading research papers with in-context explanations
Moonlight is an AI reader for research papers with explanations, translation and a library. The free plan lets you open unlimited papers but only 3 a week get AI features, and the models you can use depend on a plan that goes up to $49 a month.
Who Moonlight is for
- Fits if you read a few papers a week and want explanations beside the text
- Works for readers who need a paper translated with its layout kept
Who Moonlight is not for
- Tight if you stay free: AI features on only 3 papers a week
- Pricey if you want Claude or Gemini Pro models, which means Premium at $49 a month
- Watch out: Team plans are priced by seat tier and the billing basis isn't shown
- Watch out: no desktop or mobile app, and no integrations are listed
Why Moonlight gets a 2.2
Five grades, each with its reason. The GPA is their average: an A is 4 points, an F is none.
- CValue for moneyPro is $10 a month billed yearly ($12 monthly), the category's middle. Premium, which adds Claude and Gemini Pro models, is $49.
- CFree plan and trialA free plan with unlimited document access and AI on 3 papers a week, on two base models. A reader doing more than 3 a week will hit it.
- CFeaturesExplanations in context, layout-preserving translation, citations, chat and summary and a library. Several features are marked Limited on Free.
- BEase of useNo store rating on record. Upload a paper and read, but features like deep search take some learning.
- CPlatforms and integrationsWeb and a Chrome extension. No desktop or mobile app was found, and no integrations are listed.
What these grades rest on. Graded from this listing, whose facts were read from Moonlight's own pages on 12 November 2026. Not based on using the product, and shorter than our full reviews. How we review and grade.
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<a href="https://toolgpa.com/tools/moonlight#review"><img src="https://toolgpa.com/badge/moonlight.svg" alt="Moonlight: 2.2 GPA on ToolGPA" width="196" height="56"></a>Where Moonlight stands among AI research tools
Moonlight's GPA of 2.2 is higher than 7 of the 49 other AI research tools we grade, and level with 11.
It stands best on ease of use (B, above 29 of 49) and worst on platforms and integrations (C, above 0).
Its paid plans start at $10 a month, against a middle price of $10 for the category: 15 of the 35 others that charge start lower.
On features, ease of use and platforms it scores 2.3 out of 4. 10 tools score higher and cost less.
Each grade against the category
Every bar is all 50 AI research tools we grade, cut by the letter each got. Moonlight’s own letter is outlined.
- CValue for moneyAbove 6 of 49, level with 29
- CFree plan and trialAbove 4 of 49, level with 31
- CFeaturesAbove 1 of 49, level with 32
- BEase of useAbove 29 of 49, level with 20
- CPlatforms and integrationsAbove 0 of 49, level with 15
Price against what you get
Each dot is one of 40 AI research tools. Further left costs less, and higher up scores better on features, ease of use and platforms. Point at a dot to see which tool it is.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Keep Moonlight, or make your own?
Keep it
To replace Moonlight you would be making a library of papers and sources to search. That is not a weekend's work, with an AI app builder or without one.
That makes this kind of software worth paying for, not this one in particular: 31 of the 49 other AI research tools grade higher. It costs $120 a year.
What you could make
- Highlights: an app builder makes this well.
What you could not
- A library of papers and sources to search.
- An AI model, which you can rent by the request but not make.
- Citation records for millions of papers.
What this rests on. Moonlight’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
What is Moonlight?
Moonlight is a web-based PDF reader for research papers with AI built into the viewer. You select a passage, figure, table or equation to get an explanation in context, chat about the paper, translate it line by line, and see citation details without leaving the page. A library organizes papers, and plans differ in which AI models they can use.
Worth knowing
- The Free plan limits AI features to 3 papers a week, and several features are marked Limited there.
- Which AI models you can use depends on the plan: Premium adds the most expensive ones, including Claude and Gemini Pro models.
- Team plans are priced per user in seat tiers (1-3, 4-15, 16-29), with 30 or more seats handled through a partnership; the Team billing basis is not shown.
- The homepage source links a Chrome Web Store listing; no desktop or mobile app was found on the pages read.
Key features
- Explain in context
- Select any part of a paper to get an explanation of the passage, a figure, a table or an equation, without copying and pasting.
- Layout-preserving translation
- Translates a paper line by line, aligned with the original, and can translate whole pages.
- Smart citations
- Shows details of a cited reference in a preview so you can check it without leaving your place in the paper.
- Chat and summary
- Ask questions and discuss the paper, and get keywords and a summary of the key points.
- Library and deep search
- Organizes papers in a library and recommends related papers based on what the library holds.
- Markup and auto highlight
- Highlight, annotate and take notes, or let the tool underline key points automatically.
Moonlight pricing
As of Nov 12, 2026, Moonlight has a free plan, and paid plans start at $10 per month, billed annually ($12 billed monthly).
- Starts at
- $10 per month, billed annually ($12 billed monthly)
- Free plan
- Unlimited document access, with AI features limited to 3 papers a week.
- Free trial
- None listed
| Plan | Price | What you get |
|---|---|---|
| Free | $0 | Unlimited document access with limited AI features on 3 papers a week and two base models. |
| Pro | $10per month, billed annually ($12 billed monthly) | Unlimited AI-assisted papers, 5 infographic explanations a week and selected advanced models. Marked with a 1-week free trial. |
| Premium | $49per month, billed annually ($59 billed monthly) | Everything in Pro with access to all models, including Claude and Gemini Pro models, and 30 infographic explanations a week. |
| Enterprise | Custom | For larger teams and organizations; contact the vendor. Team seat pricing is shown for 1 to 29 seats. |
Read from themoonlight.io on Nov 12, 2026. Prices change, so confirm with Moonlight before you buy.
Ways to pay less
- Annual discount17% off with annual billing
The pricing page marks the Year option as saving 17-20%; Pro is $10 a month on annual billing against $12 monthly, and Premium $49 against $59.
Stated on themoonlight.io
Moonlight alternatives
- Moonlight vs SciSpace
Free plan · from $12/mo
- Moonlight vs Explainpaper
Free plan · from $12/mo
- Moonlight vs alphaXiv
Free plan · from $8/mo
- Moonlight vs Paperguide
Free plan · from $12/mo
- Moonlight vs OpenRead
Free plan
Common questions
Does Moonlight have an Android app?
No Android app was listed when its pages were read on Nov 12, 2026. Moonlight is listed for Web.
Does Moonlight have an iPhone app?
No iPhone app was listed when its pages were read on Nov 12, 2026. Moonlight is listed for Web.
Is Moonlight open source?
Moonlight is not described as open source on its own site, as read on Nov 12, 2026.
Sources for this page
The prices, plans, platforms and features above were read from these pages on Nov 12, 2026.