HARPA AI vs Sider vs Monica: Which Handles Video?
The general-purpose AI sidebars all summarize pages well. Video is where they diverge — and where a purpose-built tool pulls ahead.
Mentorina#harpa#sider#monica#comparison
HARPA AI, Sider and Monica are the same category of product: a chat assistant that lives in a browser side panel, works on any page, and does a long list of things — summarize, translate, rewrite, run saved prompts, automate. Merlin belongs in the same group. They are genuinely useful, and if you already pay for one you probably do not need another.
They are also generalists, and video is where that shows.
What they share
All three summarize the page you are on, answer questions about it, and handle YouTube by reading the transcript. All three do this well enough that "which one summarizes articles better" is mostly a matter of taste and which model you prefer. HARPA leans toward automation and saved commands. Sider and Monica lean toward a broad assistant with many small tools attached.
Where they overlap, pick on price and interface. There is no hidden winner.
Where they diverge
| General AI sidebars | Mentorina | |
|---|---|---|
| Web pages | Yes | Yes |
| YouTube | Yes, from the transcript | Yes, timestamps drive the player |
| Netflix | No | Yes, from the subtitle track |
| Video summary stops at your position | No | Yes |
| Breadth of non-video features | Large | Small — summarize and ask |
Checked August 2026. These products ship features constantly; check current listings.
Two things are missing from the generalist column, and they are missing for a structural reason rather than an oversight.
Netflix. Streaming subtitles are not page text. Getting at them means reading the track the player has loaded, live, in the tab. A sidebar built to summarize "the current page" does not have a path to it.
Playback position. A generalist summarizes the transcript it was given, which is the whole transcript. That is correct behaviour for a conference talk and wrong behaviour for episode four of something you are watching.
The honest trade
Mentorina does far less than any of these three. No prompt library, no automation, no email rewriting, no translation workflows, no image generation. It summarizes what is open and answers questions about it. That is the entire product.
So the comparison is not "which is more capable" — the sidebars are, by a wide margin. It is: what is your video-to-everything-else ratio?
If video is a small slice of a broad AI workflow, use the assistant you already have. Its video feature is adequate and you save a subscription.
If video is the axis — lectures, talks, series, and the documents that go with them — the depth in that one place is what you are missing, and no amount of breadth substitutes for it.
Limits worth knowing
Any Chromium browser — Chrome, Edge, Brave, Opera, Arc. Netflix needs subtitles turned on. YouTube needs the video to have captions available, though you do not need to turn them on. Scanned PDFs do not work. No Firefox, no Safari, no mobile.
Try Mentorina alongside whatever you already run — they do not conflict.