Seimai

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In-app purchases

About this app

Seimai turns long YouTube videos into clear, readable summaries you
can actually use. Share a video to Seimai, or paste a link, and get
a structured summary of what was actually said — with the source
video one tap away.

WHAT YOU CAN DO

Summarise any YouTube video
Share or paste a link and get a structured, readable summary built
from the video's transcript. 5 summaries a month are free; more
require a subscription.

Follow channels
Subscribe to a channel and its new videos are summarised for you
automatically. 2 channels are free; more require a subscription.

Ask the summary questions
Chat about the video, grounded in what the video actually says.
50 messages a month are free; more require a subscription.

Highlight and keep what matters
Highlight any passage and save it as a note. Notes are categorised
automatically into a personal knowledge base you can browse and
search. Included on every plan, including Free.

Read in your language
Summaries are translated automatically into the language you
choose. Included on every plan, including Free.

Share what you find
Publish your notes, follow other readers, and browse what the
community is highlighting. Included on every plan, including Free.

Choose how deep to read
Concise, Normal or In-depth. Detail-level selection is available on
Pro and Max; Free and Lite read at Normal.

PLANS

Free — 5 summaries, 2 channels and 50 chat messages a month.
Normal detail level.

Lite — 20 summaries, 10 channels and 150 chat messages a month.
Normal detail level.

Pro — 100 summaries, 25 channels and 500 chat messages a month.
All detail levels.

Max — 500 summaries, 50 channels and unlimited chat. All detail
levels.

New accounts get 21 days of full Pro access, free and with no
payment details required. When it ends the account moves to the
Free plan — nothing is charged unless you choose to subscribe.

Lite, Pro and Max are monthly subscriptions billed through Google
Play. Prices are shown in the app and can be cancelled any time in
your Google Play account.

GOOD TO KNOW

Summaries and translations are generated by AI from each video's
transcript, and can contain mistakes — check anything important
against the original video.

Seimai does not host, download or re-upload videos. Every summary
links back to the source video on YouTube.

Privacy policy: https://seimai.app/privacy
Terms of service: https://seimai.app/terms
Contact and abuse reports: [e-mail]

What’s new

First release of Seimai on Google Play.

Turn long YouTube videos into structured summaries you can read in
minutes. Ask questions about a video in a chat grounded in what it
actually says, highlight passages into an auto-categorised notes
library, follow channels for automatic summaries, and read in your
own language.