Desktop app for OBS · Windows 10 and 11
Your chat already marked your best moments.
And your PC already recorded them. Aftercast watches OBS while you stream, scores the seconds your chat, your channel events and your game all reacted to, and cuts them out of the recording that is already on your disk.
You review a short, ranked list instead of scrubbing a four-hour VOD. And the four-hour VOD never goes anywhere.
Free plan, no card. Needs OBS 28 or newer, recording locally, on Windows 10 or 11.
The difference that matters
Your footage never leaves your PC
Tools that clip your stream work from a finished VOD — one you upload, or one they pull from your channel. Either way the whole stream leaves your control before a single frame is scored.
Aftercast starts from the other end. The desktop app runs on the machine that is already recording, so the file is already there. It uploads short segments around scored moments and a compressed audio track for the transcript — measured in megabytes, not the gigabytes a stream actually weighs.
- No overnight upload before you can see a clip.
- Nothing to delete from someone else’s server if you change your mind.
- Archiving the whole recording is a setting, and it is off unless you turn it on.
- A stream you would never upload can still be clipped.
How it works
Four stages, and you only have to be present for one
You stream. Everything below happens while you do, or in the minutes after you stop recording.
- 01
Capture
A desktop app on the PC running OBS. It sees recording start and stop, reads your scene layout, and holds the footage where it already is.
- 02
Detect
Chat spikes, follows, subs, cheers, raids, game-log events and your marker hotkey are scored as they happen, and clustered into moments.
- 03
Polish
Segments arrive with a transcript, a suggested title and caption, word-level captions, and a 9:16 crop taken from your real OBS layout.
- 04
Publish
Approve what you want, and it goes out to TikTok, YouTube Shorts and Instagram Reels on a schedule you set.
Detection
It measures what happened, not what might go viral
Four kinds of signal, weighted so that several unrelated hints at the same second beat one hint repeating ten times.
- Chat
- A jump in message rate, unique chatters or emote density. Third-party emotes count — 7TV, BetterTTV and FrankerFaceZ, not just the platform’s own.
- Channel events
- Follows, subscriptions, cheers and raids, arriving as they happen rather than being reconstructed from a VOD afterwards.
- Game logs
- Events read from a supported game’s own local log files on your PC. Bonus signal where a game provides it, never the backbone.
- You
- A marker hotkey that works while your game has focus, and a Mark moment button on the dashboard. The strongest signal there is, because everything else is an inference and this one is certainty.
There is no virality score here
Predicting what will do numbers is a claim nobody in this category has earned — the best-known virality score still has roughly two in five of its clips thrown away. Aftercast's score says something narrower and checkable: this many independent things happened at once, and real people reacted. Every candidate shows which signals produced it, so you can tell a chat explosion from a raid before you press play.
After the stream
A short list, already most of the way finished
Detection is the hard part. What comes after it is the part that eats an evening, so most of it is done before you open the queue.
- A ranked review queue
- Each candidate with its score, the signals behind it, and a preview. Trim either end, approve, or reject with a reason.
- Transcripts, searchable
- The whole stream transcribed and searchable, sitting beside the clip while you edit it. Export as SRT, VTT or plain text.
- Titles and captions, drafted
- A title, description and hashtags suggested per platform, and word-level captions you can restyle. Suggestions — read them before they go out under your name.
- A vertical crop that is not a guess
- We are told where your facecam and gameplay sources are, because OBS tells us. Tools that work from a flat video have to infer it.
- Your brand on it
- Logos, palette, caption styles, watermark and bumpers, applied everywhere rather than re-picked per clip. Pro and above.
- Scheduled publishing
- Approved clips go to TikTok, YouTube Shorts and Instagram Reels on a cadence you set, with retries and preflight checks.
- Overlays for OBS
- Alerts, chat, goals and now-playing, added straight into a scene you choose — no browser-source URL to copy.
- Analytics worth reading
- Peak and average viewers, chat rate, follower change and event totals per stream; views, likes and shares per clip.
- A public creator page
- Live status, a clip gallery, your VOD archive and your schedule, on one link you can put in a bio.
Before you sign up
The things that would annoy you on day one
You run OBS. You would find all of this out yourself by Thursday, and it is cheaper for both of us if you find it out now.
- The capture app is Windows only
- Windows 10 and 11. There is no macOS or Linux build. The dashboard is a website and works anywhere.
- It starts on recording, not on going live
- Aftercast cuts from your local recording, so a stream with no recording produces no clips. This catches more people out than anything else.
- Without a linked platform it has little to go on
- Chat and channel events are most of the signal. Unlinked, you are left with audio, game logs and your own markers.
- It is early software
- There will be bugs and outages, and some of the catalogue is still being built. Keep your own recordings — see the terms.
Stream tonight. Open a short list tomorrow.
The free plan gives you automatic detection, up to ten clips a stream, one connected platform, transcripts and search — enough to find out whether the scoring agrees with you, which is the only question that matters.
Free plan, no card. You need OBS 28 or newer on Windows 10 or 11.