Best AI Data Labeling Tools in 2026
Updated
In short: doccano is ranked #1 of 21 as of 4 October 2026, ahead of Label Studio and Alibaba Cloud PAI iTAG. The best-ranked option with a free plan is Label Studio. The lowest first paid tier on this page is CVAT at $1.92/mo.
When preparing data for AI systems, labeling tools can support different modalities, annotation approaches, and review processes. The ranking opens with doccano, Label Studio, and LabelU, with Alibaba Cloud PAI iTAG and BRAT also among the first entries. Compare supported modalities and model-assisted labeling, then consider human review workflows and custom ontologies. API access and deployment options can help you assess how a tool fits your technical setup. Free-plan availability and paid-from pricing provide additional points of comparison. The right balance depends on the data you need to label and how your team organizes annotation and review.
21 AI data labeling tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
9 of the 21 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 |
|---|---|---|---|---|---|---|---|
| 1 | doccanoWeb · Windows · Mac · Linux · Android · iPhone · Self-hosted · API | Three bars | — | 6 of 6 | Free | 6.8 | |
| 2 | Label StudioWeb · Windows · Mac · Linux · Self-hosted · API | Three bars | — | 4 of 6 | $99/mo | 6.6 | |
| 3 | Alibaba Cloud PAI iTAGWeb · Windows · Linux · API | Three bars | — | 3 of 6 | Free | 6.5 | |
| 4 | BRATWeb · Mac · Linux · Self-hosted | Three bars | — | 3 of 6 | Free | 6.5 | |
| 5 | RoboflowWeb · Android · iPhone · Self-hosted · API | Three bars | — | 3 of 6 | $39/mo | 6.5 | |
| 6 | Amazon SageMaker AutopilotWeb · API | Two bars | — | 1 of 6 | — | 6.4 | |
| 7 | ArgillaWeb · Linux · Self-hosted · API | Two bars | — | 2 of 6 | Free | 6.4 | |
| 8 | CVATWeb · Self-hosted · API | Two bars | — | 1 of 6 | $1.92/mo | 6.4 | |
| 9 | SuperviselyWeb · Self-hosted · API | Two bars | — | 1 of 6 | €199/mo | 6.4 | |
| 10 | LabelUWeb · Windows · Mac · Self-hosted · API | Two bars | — | — | 3 of 6 | — | 5.6 |
| 11 | LabelboxWeb · API | One bar | — | — | 1 of 6 | — | 5.5 |
| 12 | BasicAIWeb · Self-hosted · API | One bar | — | — | 1 of 6 | $550/mo | 5.4 |
| 13 | Intellisane Annotation PlatformWeb | No signal | — | — | 1 of 6 | — | 5.2 |
| 14 | ProdigyWeb · Windows · Mac · Linux · Self-hosted · API | Two bars | — | — | 4 of 6 | — | 5.2 |
| 15 | V7 DarwinWeb | No signal | — | — | 1 of 6 | — | 5.2 |
| 16 | DataloopWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 17 | MoniSa DataOpsNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 18 | SuperAnnotateWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 19 | VGG Image AnnotatorWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 20 | EncordWeb | No signal | — | — | 1 of 6 | — | 4.7 |
| 21 | Kili TechnologyWeb | No signal | — | — | 1 of 6 | — | 4.7 |
Is your app on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which AI data labeling tool is ranked first on Freedom251?
doccano is ranked #1 of 21 with a score of 6.8. Label Studio is second and Alibaba Cloud PAI iTAG third.
How many of these have a free plan?
8 of the 21 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, CVAT has the lowest first paid tier we found: $1.92/mo.
How is this list ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation. Paid placements never change a rank.