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
$19/molowest paid tier
5 Oct 2026last checked
0 of the 6 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 26 | HeurioWeb · Extension | One bar | — | — | 1 of 6 | $19/mo | 4.9 |
| 27 | Marker.ioWeb · Extension | One bar | — | — | 1 of 6 | $39/mo | 4.9 |
| 28 | ClickCuesWeb | One bar | — | — | 1 of 6 | — | 4.8 |
| 29 | ReviewSightWeb | One bar | — | — | 1 of 6 | — | 4.8 |
| 30 | Simple CommenterWeb | One bar | — | — | 1 of 6 | — | 4.8 |
| 31 | WebvizioWeb | One bar | — | — | 1 of 6 | — | 4.8 |
Compare all 6 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | Annotation modes | Collaborative review |
|---|---|---|---|---|---|---|---|---|
| 26 | Heurio | 4.9 | No | $19/mo | No | 19 /user/mo | comments | Yes |
| 27 | Marker.io | 4.9 | No | $39/mo | No | — | — | — |
| 28 | ClickCues | 4.8 | No | — | No | — | both | Yes |
| 29 | ReviewSight | 4.8 | No | — | No | — | both | Yes |
| 30 | Simple Commenter | 4.8 | No | — | No | — | both | Yes |
| 31 | Webvizio | 4.8 | No | — | No | — | both | Yes |
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