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Screen to record
Choose a full display or a specific window from live visual previews before recording.
Private Screen Recorder for Mac
Atlas
Helios — Private Screen Recorder for Mac
Light and sound, kept inside your Mac.
Record the screen you choose and its audio for up to three hours. Atlas Helios keeps everything local and saves a private MP4 on your Mac.
- Maximum recording time: 3 hours
- 3h
- MP4 saved
- MP4
- Language
- 20
REAL APP UI · RETINA CAPTURE · SAMPLE CONTENT
FULL RES · 1640 × 1560 ↗Helios Tab Lock
Keep recording the tab you chose, even while you browse in another tab.
Load the Helios extension in a Chromium browser and pair it with this code.
Control signals stay on this Mac.Atlas Helios · v0.5.0
What is Helios?
Record the screen you choose and its audio for up to three hours. Atlas Helios keeps everything local and saves a private MP4 on your Mac.
- Maximum recording time: 3 hours
- 3 hours
- MP4 saved
- MP4 · Local
- Resolution and estimated file size
- 1080p · 720p · 480p
- Audio
- System audio · Microphone audio
Private by default
Your recording never leaves your Mac.
No account, ads, analytics, cloud upload, or recording-data transmission. You choose the destination and retain control.
NO ACCOUNTNO CLOUDNO ANALYTICSNO ADS
Core features
Everything needed for a clear, private recording.
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Audio
Turn system audio and microphone audio on or off independently and save them in the same MP4.
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Resolution and estimated file size
Choose 1080p, 720p, or 480p and see realistic one- and three-hour size estimates before recording.
Practical estimates
Resolution and estimated file size
Estimate for typical web meetings and screen activity at 30 fps. Free space is checked before recording.
- 1 hour approx.
- 1.5–2 GB
- 3 hours approx.
- 4.5–6 GB
- 1 hour approx.
- 500 MB–1 GB
- 3 hours approx.
- 1.5–3 GB
- 1 hour approx.
- 250–400 MB
- 3 hours approx.
- 750 MB–1.2 GB
How it works
From selection to MP4 in three steps.
- 01Screen to record
Choose a full display or a specific window from live visual previews before recording.
- 02Audio
Turn system audio and microphone audio on or off independently and save them in the same MP4.
- 03Choose destination and start recording
Choose 1080p, 720p, or 480p and see realistic one- and three-hour size estimates before recording.
Atlas Helios
Helios questions, answered
What is Atlas Helios?
Record the screen you choose and its audio for up to three hours. Atlas Helios keeps everything local and saves a private MP4 on your Mac.
Does Atlas Helios upload recordings?
No account, ads, analytics, cloud upload, or recording-data transmission. You choose the destination and retain control.
Can I record system and microphone audio independently?
Turn system audio and microphone audio on or off independently and save them in the same MP4.
Which resolutions are available, and can I estimate file size?
Choose 1080p, 720p, or 480p and see realistic one- and three-hour size estimates before recording.
How long can I record, and which file format is used?
Each recording can last up to three hours and is saved locally as an MP4 in the destination you choose.
Which Macs are supported, and is the download available?
Atlas Helios supports Apple silicon Macs running macOS 15 or later. The Apple-notarized DMG is available now as a free download.
Freeware · Local first
Free for Apple silicon Macs.
Download the Apple-notarized DMG for Apple silicon Macs running macOS 15 or later.
Download for freeApple silicon · macOS 15+ · Version 0.5.0 · SHA-256 027e45ce5453d07d3f21df308164e81e23e2acb3688b1fed5412e2178da923b8
Share Atlas Helios
Share Helios
Record the screen you choose and its audio for up to three hours. Atlas Helios keeps everything local and saves a private MP4 on your Mac.