ExplainpaperFree plan
Paid from
$16 a month
View plans and limitsUpdated 4 September 2026 · Independent comparison
Explainpaper vs Petal:
which should you use?
Explainpaper and Petal, side by side. Find the one that fits what you need to do.
Find your best fitThe 30-second answer
Explainpaper highlight the passage that lost you and get it explained at the level you ask for, in place, without leaving the paper.
Petal a document library with AI built in rather than a chat window you paste into, so your sources stay organised between sessions.
Pricing, simplified
Start free. Upgrade when you need more.
PetalFree plan
Paid from
$4.25 a month
View plans and limitsThe 30-second comparison
If you only read one section, make it this one. Rows where both sides say the same thing are left out — the point is where they differ. Where each row came from is listed underneath.
| Category | Explainpaper | Petal | Better fit |
|---|---|---|---|
| What it's built for | Highlight the passage that lost you and get it explained at the level you ask for, in place, without leaving the paper. | A document library with AI built in rather than a chat window you paste into, so your sources stay organised between sessions. | Tie |
| Free plan | Yes. Free for everyone, forever, and not metered: unlimited highlight explanations, follow-up questions and Zotero import. The limit is model quality — the free tier runs on what Explainpaper calls basic AI models | Yes. Free, with 1GB of cloud storage, one seat and three guests. Support is included rather than priority | Tie |
| Cheapest way to pay | $16 a month. | $4.25 a month. | Petal |
| What the paid tiers cost |
|
| Tie |
| What to watch out for | Explains what a passage says rather than whether it is right, and a confident explanation of a flawed method reads exactly like a good one. The free tier is unlimited but runs on weaker models, so what you pay for is the quality of the explanation rather than more of it. | You have to commit to keeping documents in it for the value to appear. The individual tiers are separated by storage rather than by features, and the two cheapest are priced for .edu addresses — without one they cost around two thirds more. | Tie |
| Who it is usually for | students, researchers | researchers, working professionals, students | Tie |
| Made by | Explainpaper — US. | Petal — Cambridge, US. | Tie |
Petal is ahead on 1 of the 7 rows compared — cheapest way to pay — and it is not about how well it does the job. On fitness for the work, it and Explainpaper are level. Treat this as a tiebreaker, not a recommendation.
Petal
A document library with AI built in rather than a chat window you paste into, so your sources stay organised between sessions.
✓ A document library with AI built in rather than a chat window you paste into, so your sources stay organised between sessions.
✓ You want the cheaper paid plan, $4.25 against $16
✓ You are among working professionals
✓ Free, with 1GB of cloud storage, one seat and three guests. Support is included rather than priority
Highlight the passage that lost you and get it explained at the level you ask for, in place, without leaving the paper.
Explainpaper is the better answer when the job is what it was built for rather than what the pick above does broadly.
✓ Highlight the passage that lost you and get it explained at the level you ask for, in place, without leaving the paper.
✓ Free for everyone, forever, and not metered: unlimited highlight explanations, follow-up questions and Zotero import. The limit is model quality — the free tier runs on what Explainpaper calls basic AI models
✓ It is aimed at students, researchers
✓ Paid plans start at $16 a month
How we know
Every row that separated these two, and where it came from. Nothing here is a hands-on test — if a line rests on a vendor’s own pricing page, it says so and links it.
| Row | Favours | Weight | Where it came from |
|---|---|---|---|
| Cheapest way to pay | Petal | Everything else | From each vendor’s own pricing page. Dates and pages are listed below. |
The prices
Explainpaper. Read by hand off explainpaper.com on 4 September 2026. It is not on the monthly re-check, so confirm there before paying. explainpaper.com/pricing
Petal. Read by hand on 4 September 2026, because Petal cannot be read automatically: Plans live at /resources/pricing, not /pricing, which 404s. Still drawn in JavaScript, so transcribed by hand; re-verify the same way. petal.org/resources/pricing
The ratings
The category these two share. Search, Research & Academics — both are listed there in the catalogue, and the fit recorded against each listing is a judgement made here, by hand.
The nine-category grid below. Derived from what each product is listed for, by one script, once per build — so the same pair always reads the same. It is a derivation, not a review.
What this is not
Neither product was run side by side to produce this page. Nobody was paid to appear on it and nothing here is ranked by commission.
To put the same question to both and read the answers yourself, run them side by side — that is a live test, and this is not.
Choose based on what you’re doing
All ten categories, including the ones where neither of these is the answer. These ratings are derived from what each product is listed for, not from running it — a rating here is a reading of the record, and the record is linked.
01
General-Purpose AI Assistants
Questions, brainstorming, explanations, everyday tasks, decision-making, general advice.
Explainpaper
Not a good fitPetal
Not a good fitBest choice: Neither
02
Search, Research & Academics
Web research, deep research, books, academic papers, citations, news, fact-checking.
Explainpaper
Good fitPetal
Good fitBest choice: Tie
03
Writing, Communication & Language
Emails, reports, essays, editing, summarizing, translation, presentations.
Explainpaper
Not a good fitPetal
Not a good fitBest choice: Neither
04
Coding, Data & Technical Work
Programming, debugging, data analysis, spreadsheets, math, engineering, technical research.
Explainpaper
Bad fitPetal
Bad fitBest choice: Neither
05
Business, Finance & Professional Work
Business strategy, investing, market research, legal, sales, HR, accounting, consulting.
Explainpaper
Not a good fitPetal
Not a good fitBest choice: Neither
06
Image & Design
Image generation, photo editing, logos, graphics, product design, advertising creatives.
Explainpaper
Bad fitPetal
Bad fitBest choice: Neither
07
Video
Video generation and editing, clipping, subtitles, avatars, animation and motion capture.
Explainpaper
Bad fitPetal
Bad fitBest choice: Neither
08
Audio, Voice & Music
Voice generation, transcription, music, dubbing, sound cleanup and podcast production.
Explainpaper
Bad fitPetal
Bad fitBest choice: Neither
09
Marketing & Content Creation
Social media, SEO, advertising, copywriting, content ideas, scripts, brand development.
Explainpaper
Bad fitPetal
Bad fitBest choice: Neither
10
Productivity, Automation & Personal Life
AI agents, workflows, scheduling, meetings, organization, shopping, travel, personal finance.
Explainpaper
Not a good fitPetal
Not a good fitBest choice: Neither
Highlight the passage that lost you and get it explained at the level you ask for, in place, without leaving the paper.
USHighlight the passage that lost you and get it explained at the level you ask for, in place, without leaving the paper.
Free for everyone, forever, and not metered: unlimited highlight explanations, follow-up questions and Zotero import. The limit is model quality — the free tier runs on what Explainpaper calls basic AI models
It is aimed at students, researchers
Paid plans start at $16 a month
A document library with AI built in rather than a chat window you paste into, so your sources stay organised between sessions.
Cambridge, USA document library with AI built in rather than a chat window you paste into, so your sources stay organised between sessions.
You want the cheaper paid plan, $4.25 against $16
You are among working professionals
Free, with 1GB of cloud storage, one seat and three guests. Support is included rather than priority
Pricing, simplified
The plans people actually compare, read from each vendor’s own page.
PricingSimple, up-to-date plan overview.
Explainpaperby Explainpaper
Petalby PetalFree version
Explainpaper
Yes — Free plan availableFree for everyone, forever, and not metered: unlimited highlight explanations, follow-up
Petal
Yes — Free plan availableFree, with 1GB of cloud storage, one seat and three guests. Support is included rather than
Individual plans
Explainpaper
Pro
$16 / month$12 / month (annual)
Teams
—
Petal
Plus
$4.25 / month$2.55 / month (annual)
Advanced
$8.49 / month (annual)
Premium
$29.99 / month$25.49 / month (annual)
Teams Starter
$59.99 / month$50.99 / month (annual)
Teams Pro
$119.99 / month$101.99 / month (annual)
Business plans
ExplainpaperNot sold to teams
PetalNot sold to teams
Enterprise
ExplainpaperNot published
Petal
Custom pricingTeams Enterprise
Tell us what you use AI for
Pick your main job and the verdict below changes to match. Every answer is on the page already, so this works as a reader, not a lookup.
The verdict for that job
Evenly matched
Close call. Both cover search, research & academics at the same level; both have a free plan you can start on; Petal is cheaper to start paying for, $4.25 against $16.
7 rows compared
Frequently asked questions
Is Explainpaper or Petal better?
Petal is ahead on 1 of the 7 rows compared — cheapest way to pay — and it is not about how well it does the job. On fitness for the work, it and Explainpaper are level. Treat this as a tiebreaker, not a recommendation. both have a free plan you can start on; Petal is cheaper to start paying for, $4.25 against $16. Explainpaper: Highlight the passage that lost you and get it explained at the level you ask for, in place, without leaving the paper. Petal: A document library with AI built in rather than a chat window you paste into, so your sources stay organised between sessions.
Is Explainpaper or Petal cheaper?
Petal — paid plans start at $4.25 a month against $16 a month.
Do Explainpaper and Petal both have free plans?
Yes. Explainpaper: Free for everyone, forever, and not metered: unlimited highlight explanations, follow-up questions and Zotero import. The limit is model quality — the free tier runs on what Explainpaper calls basic AI models. Petal: Free, with 1GB of cloud storage, one seat and three guests. Support is included rather than priority.
What should I watch out for?
Explainpaper: Explains what a passage says rather than whether it is right, and a confident explanation of a flawed method reads exactly like a good one. The free tier is unlimited but runs on weaker models, so what you pay for is the quality of the explanation rather than more of it. Petal: You have to commit to keeping documents in it for the value to appear. The individual tiers are separated by storage rather than by features, and the two cheapest are priced for .edu addresses — without one they cost around two thirds more.
Read more
Explainpaper
What it is for, who makes it, what it costs and what to use instead.
Petal
What it is for, who makes it, what it costs and what to use instead.
Best AI for Research
Web research, deep research, books, academic papers, citations, news, fact-checking.