kitio.aiReadwise Reader vs SigmaOS
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Readwise Reader starts at See pricing page and SigmaOS starts at See pricing page. Check both pricing pages for current plans.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Articles, PDFs and EPUBs
- Ghostreader AI
- Highlight export
- Newsletter inbox
- Text to speech
- Workspaces
- Vertical tabs
- Tabs as tasks
- Split screen
- Lazy Search
- Airis AI companion
| Feature | Readwise Reader | SigmaOS |
|---|---|---|
| Best for | Read-later app with highlights and an AI reading assistant | Mac browser with workspaces, tabs as tasks and an AI companion |
| Category | Productivity | Productivity |
| Pricing model | Free trial | Freemium |
| Starting price | See pricing page | See pricing page |
| Free plan | No, 30-day trial | Yes |
| Made by | Readwise | SigmaOS |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
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Pricing compared
Readwise Reader starts at See pricing page and SigmaOS starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Highlights Lite
$5.59/mo (billed yearly)
- Browse and search highlights
- Sync highlights from all sources
- No Reader, tags or exports
Highlights only
$7.99/mo (billed yearly)
- Daily Review email and app
- Import from Kindle, Apple, Kobo
- Export to Notion, Obsidian
- No Reader access
Full Readwise
$9.99/mo (billed yearly)
- Reader and Highlights together
- Unlimited articles, PDFs, EPUBs, RSS
- Text-to-speech and Ghostreader
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Readwise Reader
- Handles many reading formats
- Strong highlight syncing
- Useful AI while reading
- No free plan after trial
- Many features to learn
SigmaOS
- Free to download
- Clear tab organization by workspace
- AI answers in the page context
- Mac only
- Takes getting used to after Chrome
- Pricing for extras not shown
Which one should you choose?
Choose Readwise Reader if you want:
- Handles many reading formats
- Strong highlight syncing
- Useful AI while reading
Watch out: no free plan after trial.
Choose SigmaOS if you want:
- Free to download
- Clear tab organization by workspace
- AI answers in the page context
Watch out: mac only.
Readwise Reader vs SigmaOS FAQ
What is the difference between Readwise Reader and SigmaOS?
Readwise Reader: Read-later app with highlights and an AI reading assistant. SigmaOS: Mac browser with workspaces, tabs as tasks and an AI companion. Both are productivity tools.
Is Readwise Reader or SigmaOS cheaper?
Readwise Reader starts at See pricing page and SigmaOS starts at See pricing page. Check both pricing pages for current plans.
Do Readwise Reader and SigmaOS have free plans?
Readwise Reader: No, 30-day trial. SigmaOS: Yes.
Who makes Readwise Reader?
Readwise Reader is made by Readwise, based in United States.
Who makes SigmaOS?
SigmaOS is made by SigmaOS, based in United States.
Which should I choose, Readwise Reader or SigmaOS?
Choose Readwise Reader if you value handles many reading formats and strong highlight syncing. Choose SigmaOS if you value free to download and clear tab organization by workspace.