vs
HARPA AI vs Signal Extractor: no tokens to count
HARPA is a browser automation platform with a YouTube summary command. The free demo is 100 command runs in total, then it's priced in Megatokens.
The short answer
HARPA is a serious tool aimed at a different problem. It runs a library of over a hundred commands in your browser, monitors pages for changes, tracks prices and automates multi-step web work — and one of those commands summarizes a YouTube video. If you want an agent living in your browser, it's a strong product. For summarizing videos it's an awkward fit. The free plan is a demo of a hundred command runs in total, not a monthly allowance, and it covers everything you try rather than videos alone. Paid plans start around $12 a month priced in Megatokens, where one Megatoken is roughly 750,000 words and output is charged at three times input, so premium models cost more per run and your monthly spend depends on how verbose the answers were. You can bring your own API key instead, which trades the markup for managing a provider bill. Signal Extractor doesn't meter anything. Paste a YouTube link and read a one-line verdict plus five to eight timestamped takeaways in about ten seconds, free, no account, nothing installed, any video length, and videos with no captions still work because it falls back to the audio. Afterwards: follow-up chat with the transcript in context, Notion export, a public share link, and channel following that emails you every new upload.
Feature by feature
21
Signal Extractor wins
3
Tied
7
HARPA AI wins
| Price & limits | Signal Extractor | HARPA AI |
|---|---|---|
| Price to summarize | Free | From $12/mo |
| Free allowance | No limit | 100 runs total |
| Free allowance resets | n/a | No |
| Priced in tokens | No | Yes |
| Cost per summary is predictable | Yes | No |
| No account needed | Yes | No |
| No extension to install | Yes | No |
| Bring your own API key option | No | Yes |
| The summary | Signal Extractor | HARPA AI |
| Timestamped key takeaways | Yes | Limited |
| Timestamps jump into the video | Yes | No |
| One-line verdict up top | Yes | No |
| Same structure every time | Yes | Limited |
| No prompt or command to pick | Yes | No |
| Videos with no captions | Yes | No |
| Tuned for spoken video content | Yes | No |
| Custom commands and prompts | No | Yes |
| After the summary | Signal Extractor | HARPA AI |
| Follow-up chat on the video | Yes | Yes |
| Chat can search the web | Yes | Yes |
| Channel follow + email digest | Yes | No |
| X (Twitter) posts too | Yes | No |
| Save to Notion | Yes | No |
| Public share link | Yes | No |
| Copy as markdown | Yes | Yes |
| Saved history | Yes | Limited |
| Public summary library | Yes | No |
| Everything else it does | Signal Extractor | HARPA AI |
| Web page monitoring and alerts | No | Yes |
| Price tracking | No | Yes |
| Scraping and data extraction | No | Yes |
| Multi-step browser automation | No | Yes |
| 100+ prebuilt commands | No | Yes |
| Nothing to learn before using it | Yes | No |
HARPA AI details taken from their own site and public documentation, checked August 2026. Their features and limits change — check theirs for today's details. Logos and product names are trademarks of their respective owners, shown here to identify the products compared.
Which should you use?
Use Signal Extractor if
You want videos summarized well, free, with no token accounting, no trial that runs out, and no automation platform to learn.
Use HARPA AI if
You want a browser agent — page monitoring, price tracking, scraping, multi-step automations across a hundred-plus commands — and video summaries are incidental.
HARPA AI questions
Is HARPA AI free?
There's a free demo plan of around a hundred command runs in total — not a hundred a month. Every command you try draws from the same pool, so it's a trial rather than a free tier. Paid plans start around $12 a month.
How does HARPA's pricing work?
In Megatokens, where one Megatoken is roughly 750,000 words, and output tokens are charged at about three times input. Premium models consume more per run. You can also bring your own API key and skip HARPA's markup, at the cost of managing a provider bill yourself.
What is a simpler HARPA alternative for YouTube?
Signal Extractor if summarizing videos is the goal. It's free with no account, nothing to install, no commands to choose and no tokens to count — paste a link and read the summary.
Does HARPA give clickable timestamps?
Not links you can click into the video. Every takeaway here carries a timestamp that opens YouTube at that exact second, so you can verify any claim in a couple of seconds.
Can HARPA summarize a video with no captions?
No — it works from the caption track. Signal Extractor falls back to processing the audio, so videos with captions disabled still get summarized.
Which is better for long videos?
Signal Extractor handles any length for free, and the length doesn't change the cost because there isn't one. On a token-metered plan, a three-hour video is straightforwardly more expensive than a short one.
What does HARPA do better?
Automation, and it isn't close. Page monitoring, price tracking, scraping, multi-step workflows and a library of over a hundred commands you can customise. If you want an agent working across the web on your behalf, that's a real product and this isn't it.
Is HARPA worth paying for?
If you'll use the automation, yes — there's little else like it in a browser extension. If you signed up mainly to summarize videos, you're paying a subscription and doing token maths for something available here for nothing.
Try it on the video you were about to watch
Paste a YouTube link and read the takeaways in about ten seconds. No account, no extension, no card.
Summarize a video