Best Web Annotation Tools in 2026
Updated
31 web annotation tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
31ranked
0free plans on this page
$39/molowest paid tier
5 Oct 2026last checked
Recognised 40% · Phone app 26% · Documented 20% · Free plan 14% of the score
- 26 Heurio No phone app RecognisedPhone appDocumentedFree plan 5.2 Annotation modes: commentsCollaborative review: YesGuest access: Yes
- 27 Marker.io No phone app RecognisedPhone appDocumentedFree plan 5.2$39/mo
- 28 ReviewSight No phone app RecognisedPhone appDocumentedFree plan 5.2 Annotation modes: bothCollaborative review: YesGuest access: Yes
- 29 Simple Commenter No phone app RecognisedPhone appDocumentedFree plan 5.2 Annotation modes: bothCollaborative review: YesGuest access: Yes
- 30 Webvizio No phone app RecognisedPhone appDocumentedFree plan 5.2 Annotation modes: bothCollaborative review: YesGuest access: Yes
- 31 Ybug No phone app RecognisedPhone appDocumentedFree plan 5.2
Compare all 6 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | Annotation modes | Collaborative review |
|---|---|---|---|---|---|---|---|---|
| 26 | Heurio | 5.2 | No | — | No | 19 /user/mo | comments | Yes |
| 27 | Marker.io | 5.2 | No | $39/mo | No | — | — | — |
| 28 | ReviewSight | 5.2 | No | — | No | — | both | Yes |
| 29 | Simple Commenter | 5.2 | No | — | No | — | both | Yes |
| 30 | Webvizio | 5.2 | No | — | No | — | both | Yes |
| 31 | Ybug | 5.2 | No | — | Yes | — | — | — |
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