Become a design partner
Running a large, multi-team S3 estate? Work with us hands-on now, shape the product, and get structure and ownership over your storage that most teams have to assemble by hand.
Apply as a design partnerThe semantic layer for cloud object storage.
JustStor turns S3 inventory and activity signals into the datasets teams actually work with: who owns them, how they're used, what they cost, and what can safely change.
In active development and private preview with selected design partners. Not generally available yet.
s3://data-lake
events/year=2025/month=06/part-0007.parquetevents/year=2025/month=07/part-0031.parquetevents/year=2025/month=08/part-0094.parquet + 1.2B more objects JustStor discovery engine
events dataset
What it is
Object storage has become the place companies put everything. But most teams still can't reliably say what's actually in it.
S3 Inventory can list every object. Access logs can show how storage is used. Neither tells you which objects form a dataset, who's accountable for it, or what might break if you move it.
The system has objects, but the organization thinks in datasets.
JustStor turns S3 inventory and activity signals into a map of the real datasets underneath: their ownership, usage, cost, and what can safely change. Storage finally becomes legible.
Who's building JustStor
JustStor is built by Sagi Bashari, former CTO of MyHeritage, where for over a decade he led the company's AWS migration and built the distributed batch-processing systems behind its matching and discovery technologies, scaling them to 39 billion+ records. After years of operating sprawling storage estates at that scale, JustStor is the product he wanted.
Recent writing
- Buckets and objects are not enough ↗ Why object storage needs a dataset abstraction it doesn't have.
- How intelligent is S3 Intelligent-Tiering? ↗ What S3's automatic tiering can and can't know about your data.
Private preview
Get involved early.
JustStor's commercial product is in active development and private preview with a small group of design partners. It is not generally available yet. You can apply as a design partner or follow product progress.
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Not a fit yet, or not ready? Leave your details and we'll keep you posted as we make progress and let you know when JustStor is ready for customers.
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